A sunken drilling platform system construction method

Abstract

The application discloses a sinking type drilling platform system construction method, which comprises the following steps: planning of a construction site, positioning and lofting, first-time concrete pouring, second-time concrete pouring, construction of a steel structure platform for drilling pile construction, erection of a mud circulating system, drilling pile construction and centralized cleaning; the method fully utilizes existing construction areas and stratum geological conditions, divides and excavates a pile cap foundation pit in sections, sets up a retaining wall to form a stable pit wall, adjusts and positions a steel casing during construction, avoids problems of subsequent pile foundations to cause construction delay, pours in sequence, forms a closed and stable foundation pit structure by combining a concrete cushion layer with a portal crane track foundation and a retaining wall, ensures that there is no interval in the middle during early-stage concrete pouring, and avoids repeated large-volume excavation and backfill construction.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and in particular to a construction method for a sunken drilling platform system. Background Technology

[0002] To further promote long-span bridges, the use of large-diameter pile foundations has reached new heights, characterized by increased pile diameter, longer pile length, and enlarged pile cap dimensions.

[0003] Currently, for onshore pile foundation drilling platform systems, most drilling platforms are formed by leveling the pile positions on-site. Excavation is done nearby using a mud pit connected to the pile position to form a mud circulation system. This method allows for rapid mud pit formation and can be used as needed when site constraints are not a factor. For smaller pile foundations under caps, truck cranes or crawler cranes are used to extend and lower the reinforcing cage. For large-cap pile foundations, mud tanks can be used to address mud storage and slag removal issues, while gantry cranes are used for extending and lowering the reinforcing cage. Steel structure platforms are not suitable for onshore applications and are mostly used for offshore, fully underwater foundations. A group of steel pipe piles forms the platform's support system in the water, working in conjunction with the upper distribution system to create a drilling platform. In such cases, steel pipe piles are often used separately as the foundation for gantry cranes, combined with mud sludge boats and other ship-mounted equipment to form a relatively effective underwater pile foundation drilling platform system.

[0004] Firstly, based on large-diameter pile groups, for onshore bored pile foundations located in restricted areas or where the pile tops directly contact hard strata, there are many construction interferences. The pile foundations may experience inaccurate positioning, leading to construction delays. Furthermore, the construction process strives to achieve completion in one step, which can easily result in repeated large-scale excavation and backfilling during the construction period.

[0005] Secondly, the setup of the drilling platform system not only needs to address the issues of mud circulation system configuration and slag removal during the construction of bored piles, which can lead to repeated large-scale washing and transportation work during construction, but also needs to take into account the requirements of civilized construction and subsequent pile cap construction.

[0006] Therefore, how to meet the various requirements of bored pile construction on the one hand, and how to make the platform formation method effective and conducive to the subsequent construction of the pile cap on the other hand, puts forward higher requirements for the construction method of the bored platform system. Summary of the Invention

[0007] The purpose of this invention is to provide a construction method for a sunken drilling platform system to solve the technical problem of how to meet the various requirements of drilling pile construction on the one hand, and the effective and convenient method of platform formation on the other hand, for existing onshore drilled pile foundations based on large-diameter pile groups, which are set in restricted areas or where the pile tops are in direct contact with hard strata.

[0008] This application provides a construction method for a sunken drilling platform system, including the following construction steps:

[0009] Step S1, Construction Site Planning: Demarcate the boundary of the foundation pit, divide and construct retaining walls along the perimeter of the foundation pit, and demarcate the track foundation of the gantry crane, and reserve construction space. Divide the foundation pit into Section 1, Section 2 and Section 3.

[0010] Step S2, Positioning and Setting Out: Level the foundation of the excavated section, set out the pile positions, reserve space for steel casing installation, and install the reinforcing cage;

[0011] Step S3, First Concrete Pouring: Concrete is poured for Section 1, as well as the gantry crane track foundation and retaining wall of that section. The operation of Step S2 is repeated to complete the concrete pouring for Section 2 and the gantry crane track foundation of that section, Section 3 and the gantry crane track foundation and retaining wall of that section in sequence. When the concrete pouring reaches the preset pouring volume and strength, the first concrete cushion layer is formed.

[0012] Step S4, Second Concrete Pouring: Based on the first concrete cushion layer, install the steel casing in the reserved space for the steel casing, determine the position of the steel column to set the steel plate embedded parts, and pour concrete into the foundation pit. When the concrete pouring reaches the preset pouring volume and strength, the second concrete cushion layer is formed.

[0013] Step S5: Erect the pile foundation construction platform: Based on the second layer of concrete cushion, construct a steel structure platform and install a gantry crane;

[0014] Step S6: Set up a mud circulation system for the construction of bored pile foundations: Plan the series and parallel lines of all steel casings, open holes on the side of each steel casing and connect the pipeline to form a mud circulation system. After the drilling rig is in place, mud is made in the steel casing to be drilled and the adjacent steel casings in the first round. The construction of bored pile foundations is completed in rounds. Waste mud during drilling and concrete pouring is directly discharged into the foundation pit through the mud circulation system.

[0015] Step S7, Centralized Cleaning: Dismantle the steel structure platform, clean and wash away the construction waste remaining in the steel structure platform and foundation pit, cut off the steel casing and the excess part of its pile head, and proceed to the foundation construction process.

[0016] Preferably, the positioning and layout described in step S2 specifically includes the following steps:

[0017] Step S21: After excavating section one to the design elevation, level the foundation.

[0018] Step S22: Measure and mark the pile positions along the foundation of section one and drive clear marks according to the center position of the pile hole;

[0019] Step S23: Position and erect wooden templates according to the center position mark of the pile hole to reserve space for the installation of steel casing;

[0020] Step S24: Install the reinforcing cage near the foundation of the gantry crane track, and adjust the position of the reinforcing cage by supporting the formwork.

[0021] Preferably, the steel cage described in step S24 has an L-shaped structure, with the longitudinal section of the steel cage extending into the interior of section one, and the vertical section of the steel cage forming a steel reinforcement skeleton.

[0022] Preferably, the installation of the steel casing within the reserved burial space described in step S4 includes the following installation steps:

[0023] Step S41: Set up the positioning fixture for the steel casing according to the center position of the pile hole, and use a truck crane to lift the steel casing into the positioning fixture to accurately position the steel casing;

[0024] Step S42: Install anchoring steel bars in the gap between the side wall of the steel casing and the reserved burial space of the steel casing, and fix the anchoring steel bars to the steel casing by welding.

[0025] Preferably, the erection of the pile foundation construction platform in step S5 specifically includes the following steps:

[0026] Step S51: Connect the steel column to the steel plate embedded part using a truck crane. After connection, fix the steel column to the steel plate embedded part by welding.

[0027] Step S52: Then install the main beams, Bailey beams, and distribution beams in sequence, and coordinate with the steel columns to construct the steel structure platform.

[0028] Step S53: Install the gantry crane on the gantry crane track foundation to proceed with the pile foundation construction process.

[0029] Preferably, the distribution beams described in step S52 are closely spaced, with the I-beams of the distribution beams fixed to the Bailey beams by clamps, and a gap is reserved between every two adjacent distribution beams to facilitate the washing of the steel structure platform.

[0030] Technical effects of the present invention:

[0031] 1. Make full use of the existing construction area and geological conditions, divide and excavate the foundation pit in sections, set up retaining walls to form stable pit walls, and adjust and position the steel casing during construction to avoid problems with subsequent pile foundations that may cause construction delays. Pour concrete in sequence so that the concrete cushion layer, gantry crane track foundation, and retaining walls form a closed and stable foundation pit structure, ensuring that there are no interruptions in the early concrete pouring and avoiding repeated large-scale excavation and backfilling.

[0032] 2. The establishment of a mud circulation system ensures the normal operation of the subsequent mud system. Waste mud and drill cuttings generated during drilling and grouting can also settle and remain in the foundation pit, which is convenient for centralized cleaning. This greatly reduces the work of transporting and disposing of waste mud and drill cuttings, and does not generate additional filling work. At the same time, by constructing a steel structure platform, the secondary costs incurred by conventional onshore projects due to site leveling and hardening are avoided. Attached Figure Description

[0033] Figure 1 This is a flowchart of the construction process of the present invention;

[0034] Figure 2 This is a planning diagram of the construction site for this invention;

[0035] Figure 3 This is a cross-sectional structural layout diagram of the lower platform system of the present invention;

[0036] Figure 4 This is a schematic diagram of the steel structure platform construction structure of the present invention;

[0037] Figure 5 This is a schematic diagram of the overall structure of the present invention;

[0038] The attached diagrams are labeled as follows: 1. Retaining wall, 2. Foundation pit, 3. Section 1, 4. Section 2, 5. Section 3, 7. Steel casing, 8. Reinforcing cage, 9. Gantry crane track foundation, 10. Gantry crane. Detailed Implementation

[0039] The following detailed description of the embodiments, with reference to the accompanying drawings, will further illustrate the specific implementation of the present invention, in order to help those skilled in the art to have a more complete, accurate, and in-depth understanding of the inventive concept and technical solution of the present invention.

[0040] like Figure 1-5 As shown, the present invention provides a construction method for a sunken drilling platform system, including the following construction steps:

[0041] Step 1: Construction site planning: Demarcate the boundary of the foundation pit 2, divide and construct retaining wall 1 and gantry crane rail foundation 9 along the outer perimeter of the foundation pit 2, and reserve construction space. Divide the foundation pit 2 into section 1 3, section 2 4 and section 3 5.

[0042] Step 2, Positioning and Layout: After excavating Section 1-3 to the design elevation, the foundation is leveled; the pile positions are measured and laid out along the foundation of Section 1-3 and clear marks are driven into the center of the pile holes; wooden formwork is positioned and erected according to the center marks of the pile holes to reserve space for the embedment of the steel casing 7; the reinforcing cage 8 is installed near the gantry crane track foundation 9, and the reinforcing cage 8 is adjusted by erecting the formwork; the reinforcing cage 8 has an L-shaped structure, with the longitudinal section of the reinforcing cage 8 extending into the interior of Section 1-3, and the vertical section of the reinforcing cage 8 forming a reinforcing skeleton, and the reinforcing cage 8 is adjusted by erecting the formwork.

[0043] Step 3, First Concrete Pouring: Concrete is poured for Section 1 (3), as well as the gantry crane track foundation 9 and retaining wall 1 in this section. Repeat step S2 to complete the concrete pouring for Section 2 (4) and the gantry crane track foundation 9 in this section, and Section 3 (5) and the gantry crane track foundation 9 and retaining wall 1 in this section. When the concrete pouring reaches the preset pouring volume and strength, the first concrete cushion layer is formed, which facilitates the rapid formation of closed sections in large-size foundation pits.

[0044] Step 4, Second Concrete Pouring: Based on the first concrete cushion layer, a positioning fixture for the steel casing 7 is set according to the center position of the pile hole. The steel casing 7 is then lifted into the positioning fixture by a truck crane to ensure precise positioning. Anchor bars are installed in the gap between the side wall of the steel casing 7 and the reserved embedment space of the steel casing 7. The anchor bars are fixed to the steel casing 7 by welding to install the steel casing 7 within the reserved embedment space. The position of the steel column is determined to set the steel plate embedded parts. Concrete is poured into the foundation pit 2, and the gap between the side wall of the steel casing 7 and the reserved embedment space of the steel casing 7 is filled and compacted to strengthen the stability of the pile group foundation. When the concrete pouring reaches the preset pouring volume and strength, the second concrete cushion layer is formed.

[0045] Step 5: Erect the pile foundation construction platform: Based on the second layer of concrete cushion, the steel columns and steel plate embedded parts are connected by a truck crane. After connection, the steel columns and steel plate embedded parts are fixed by welding. Then, the main beam, Bailey beam and distribution beam are installed in sequence to cooperate with the steel columns to build a steel structure platform. The gantry crane 10 is installed on the gantry crane track foundation 9 to enter the pile foundation construction process.

[0046] Step 6: Construct a mud circulation system for the construction of bored pile foundations: Plan the series and parallel lines of all steel casings 7, open holes on the side of each steel casing 7 and connect pipelines to form a mud circulation system. After the drilling rig is in place, mud is made in the first round of drilling in the steel casing 7 to be drilled and the adjacent steel casings 7. The construction of bored pile foundations is completed in rounds to ensure the normal operation of the subsequent mud circulation system. Waste mud during drilling and concrete pouring is directly discharged into the foundation pit 2 through the mud circulation system.

[0047] Step 7: Centralized Cleanup: Dismantle the steel structure platform, clean and wash away the construction waste remaining in the steel structure platform and foundation pit 2, cut off the steel casing 7 and the excess part of its pile head, and proceed to the foundation construction process.

[0048] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A construction method for a sunken drilling platform system, characterized in that, The construction steps include the following: Step S1, Construction site planning: Divide the boundary of the foundation pit (2), divide the retaining wall (1) and the crane rail foundation (9) along the perimeter of the foundation pit (2), and reserve construction space. Divide the foundation pit (2) into section one (3), section two (4) and section three (5). Step S2, Positioning and Setting Out: Excavate section one (3) and level the foundation, set out the pile positions, reserve space for the steel casing (7) and install the steel cage (8); Step S3, First concrete pouring: Concrete pouring is carried out on section one (3), as well as the gantry crane track foundation (9) and retaining wall (1) of this section. Repeat the operation of step S2, and successively complete the concrete pouring of section two (4) and the gantry crane track foundation (9) of this section, section three (5) and the gantry crane track foundation (9) and retaining wall (1) of this section. When the concrete pouring reaches the preset pouring volume and strength, the first concrete cushion layer is formed. Step S4, Second concrete pouring: Based on the first concrete cushion layer, install the steel casing (7) in the reserved space for the steel casing (7), set the steel plate pre-embedded parts by measuring the position of the steel column, and pour concrete into the foundation pit (2). When the concrete pouring reaches the preset pouring volume and strength, the second concrete cushion layer is formed. Step S5: Erect the pile foundation construction platform: Based on the second concrete cushion layer, construct a steel structure platform and install a gantry crane (10); Step S6: Set up a mud circulation system for the construction of bored pile foundation: Plan the series and parallel lines of all steel casings (7), open holes on the side of each steel casing (7) and connect the pipeline to form a mud circulation system. After the drilling rig is in place, mud is made in the first round in the steel casing (7) to be drilled and the adjacent steel casing (7). The construction of bored pile foundation is completed in rounds. Waste mud during drilling and concrete pouring is directly discharged into the foundation pit (2) through the mud circulation system. Step S7, Centralized Cleaning: Dismantle the steel structure platform, clean and rinse the construction waste remaining in the steel structure platform and the foundation pit (2), cut off the steel casing (7) and the excess part of its pile head, and enter the foundation construction process.

2. The construction method of a sunken drilling platform system according to claim 1, characterized in that, The positioning and layout described in step S2 specifically includes the following steps: Step S21: After excavating section 1 (3) to the design elevation, level the foundation; Step S22: Measure and mark the pile positions along the foundation of section 1 (3) and drive in clear marks according to the center position of the pile hole; Step S23: Position and set up wooden templates according to the center position mark of the pile hole to reserve space for the installation of steel casing (7); Step S24: Install the steel cage (8) near the gantry crane track foundation (9) and adjust the steel cage (8) by supporting the formwork.

3. The construction method of a sunken drilling platform system according to claim 2, characterized in that, The steel cage (8) mentioned in step S24 has an L-shaped structure. The longitudinal section of the steel cage (8) extends into the interior of section one (3), and the vertical section of the steel cage (8) is a steel skeleton.

4. The construction method of a sunken drilling platform system according to claim 1, characterized in that, Step S4, which describes installing the steel casing (7) within the reserved burial space, includes the following installation steps: Step S41: Set up the positioning fixture for the steel casing (7) according to the center position of the pile hole, and use a truck crane to lift the steel casing (7) into the positioning fixture so that the steel casing (7) is accurately positioned; Step S42: Anchor bars are installed in the gap between the side wall of the steel casing (7) and the reserved burial space of the steel casing (7), and the anchor bars are fixed to the steel casing (7) by welding.

5. The construction method of a sunken drilling platform system according to claim 1, characterized in that, Step S5, which involves erecting the pile foundation construction platform, specifically includes the following steps: Step S51: Connect the steel column to the steel plate embedded part using a truck crane. After connection, fix the steel column to the steel plate embedded part by welding. Step S52: Then install the main beams, Bailey beams, and distribution beams in sequence, and coordinate with the steel columns to construct the steel structure platform. Step S53: Install the gantry crane (10) on the gantry crane track foundation (9) to proceed with the pile foundation construction process.

6. The construction method of a sunken drilling platform system according to claim 5, characterized in that, The distribution beams described in step S52 are closely spaced, and the I-beams of the distribution beams are fixed to the Bailey beams by clamps. A gap is reserved between every two adjacent distribution beams to facilitate the washing of the steel structure platform.

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