A full-precast monolithic elevator foundation and a construction method thereof

Abstract

The application discloses a full-precast integral elevator foundation and a construction method thereof, and belongs to the field of full-precast integral elevator foundation construction.The hollow column and the hollow end column arranged in the precast foundation reduce the size of the precast foundation, reduce the requirements of transportation and installation of the precast foundation on the environment, and meanwhile, ensure the pile pressing and the anchor pile; the pile column is integrated, the column bottom force is directly transmitted to the pile foundation, and the stress is more direct.The application adopts the construction and the construction mode of the column foot steel bone.The advantage of the column foot steel bone design is that the column foot steel bone can be ensured to be installed into the hollow column and the hollow end column in the later period, and the connecting joint of the column foot steel bone and the pile can simultaneously bear the pulling force and the pressure, and the column foot steel bone has strong applicability; the structure and the construction and the key technology of the pile pressing platform are matched with the first and the second, and the pile pressing platform has a guarantee effect on the construction of the precast foundation.

Description

Technical Field

[0001] This invention belongs to the field of prefabricated integral elevator foundation construction, and is particularly related to a prefabricated integral elevator foundation and its construction method. Background Technology

[0002] Currently, most elevator installations use cast-in-place reinforced concrete foundations. However, cast-in-place foundations have disadvantages such as large excavation areas, extensive on-site work, long construction periods, and significant environmental impact, reducing the convenience, comfort, and safety of residents in the corresponding buildings, and having a significant impact on existing buildings with high construction risks. While existing fully prefabricated assembled foundations have the advantage of almost no wet work on-site, the elevator pit, as a waterproof structure, requires high integrity, and this type of foundation carries the risk of leakage. Prefabricated assembled monolithic foundations can reduce the amount of cast-in-place concrete work to some extent, but still retain a certain amount of cast-in-place concrete, resulting in a longer curing time, and their advantages compared to traditional cast-in-place foundations are not significant. Furthermore, in existing older residential communities, it is common for apartment layouts to be similar, and different elevator brands do not have significantly different requirements for elevator pits, which is beneficial for the mass production of prefabricated foundations, improving production efficiency and saving costs. Based on the above analysis, the invention of fully prefabricated monolithic elevator foundations has broad application scenarios and economic benefits. Summary of the Invention

[0003] To address the problems existing in the aforementioned background technology, this invention proposes a fully prefabricated integral elevator foundation and its construction method. This invention transfers the traditional on-site casting operation to the component factory, combines modular design thinking, and considers transportation and hoisting conditions. By modifying the construction process of pile foundation and column base, the size and weight of the prefabricated foundation are reduced, so as to realize the mass production, transportation and installation of prefabricated elevator foundations.

[0004] Therefore, the present invention adopts the following technical solution: a fully prefabricated integral elevator foundation structure, including a prefabricated foundation, column base steel frame, pile driving platform, and fixed tie rods.

[0005] The precast foundation includes a base slab, hollow end columns, a pit sidewall, lifting nails, lifting rings, and pile plate fixing components; several hollow end columns are arranged sequentially on the base slab, and a pit sidewall is provided between adjacent hollow end columns. The lifting nails are provided on the top of the pit sidewall, the lifting rings are provided on the base slab of the hollow end columns, and several pile plate fixing components are provided on the outer side of the pit sidewall.

[0006] The column base steel frame includes I-shaped steel, welded studs, a column base plate, column base anchor bars, and anchor bar end plates. A plurality of welded studs are arranged sequentially on both sides of the I-shaped steel. The bottom of the I-shaped steel is fixedly supported on the column base plate. A plurality of anchor bars are distributed on the bottom surface of the column base plate, and the bottom of each anchor bar is fixed with an anchor bar end plate. The column base steel frame is placed on a hollow end column or a hollow end column is filled with quick-hardening fine aggregate concrete to achieve the transition and connection between the precast foundation, pile foundation, and superstructure. The precast foundation and column base steel frame are ultimately integrated using quick-hardening fine aggregate concrete to form a permanent structural component. The pile driving platform serves as a construction auxiliary tool and is used in conjunction with the precast foundation.

[0007] The pile driving platform includes steel plates and welding studs; the pile driving platform is connected to the precast foundation as a whole by fixed tie rods, and the anchor static pressure pile reaction frame is fixed to the pile driving platform.

[0008] A method for constructing a fully prefabricated, integral elevator foundation includes the following steps:

[0009] Step 1: Foundation layout; Based on the design drawings, the plan position of the precast foundation is determined on site to ensure that the relative positional relationship between the precast foundation and the existing building is accurate.

[0010] Step 2: Excavation of the foundation pit; excavate the foundation pit according to the layout lines. Before excavation, the excavation depth should be determined. During the excavation process, a non-sloped foundation pit should be used. The excavation depth and the bottom elevation of the pit should be monitored, and over-excavation is strictly prohibited. After excavating to the design elevation, no concrete cushion layer should be set, but the bottom of the pit should be kept flat.

[0011] Step 3: Place the precast foundation; use a truck crane to lift the precast foundation to the designed position through the pre-reserved lifting points on the foundation, and re-measure and adjust the horizontal and vertical positions of the precast foundation to ensure the accuracy and precision of the installation position;

[0012] Step 4: Backfilling; After the precast foundation is placed, backfill soil in layers, evenly, and compact immediately. During backfilling and compaction, ensure the position of the precast foundation remains unchanged.

[0013] Step 5: Install the pile driving platform; lift the pile driving platform and place it on the precast foundation, ensuring that the pile driving holes on the platform coincide with the centroids of the hollow end columns. Connect the pile driving platform and the precast foundation into a single unit using the lifting rings and pile plate fixing components pre-installed on the precast foundation, and with the aid of fixing tie rods.

[0014] Step 6: Place the counterweight; After determining the weight of the counterweight based on the pile foundation bearing capacity provided in the design, combined with the survey documents and construction experience, place the counterweight.

[0015] Step 7: Drive the piles one by one; when driving the piles, drive the two ends first and then the middle to ensure that the foundation position does not deviate significantly after driving the piles.

[0016] Step 8: Remove the pile driving platform; After the pile driving is completed, the pile driving platform should be removed in a timely manner, and the elevation and plane position of the precast foundation a should be re-measured to ensure that there are no errors before proceeding to the next process;

[0017] Step 9: Place the column base steel frame; Place and fix the six column base steel frames in sequence. When placing the column base steel frames, accurately measure and position their top and bottom elevations, verticality, and planar position, and take certain measures to fix the column base steel frames.

[0018] Step 10: Pour quick-hardening micro-expansion concrete; use quick-hardening micro-expansion concrete with good fluidity to pour the hollow end columns and the hollow areas of the hollow end columns. Simultaneously, use a vibrator to compact the concrete, passing through the semi-circular notch in the column base plate to ensure the quality of the connection joint. After the concrete is poured, appropriate curing measures should be taken. Once the strength reaches the design requirements, the superstructure can be installed.

[0019] Step 11: Precast foundation construction completed.

[0020] This invention achieves the following beneficial effects: By using hollow end columns for prefabricated foundations, the size of the prefabricated foundation is reduced, lowering the environmental requirements for transportation and installation, while ensuring the effectiveness of pile driving and anchoring. It achieves pile-column integration, with the column base force directly transferred to the pile foundation, resulting in more direct stress distribution. This invention employs a column base steel frame structure and construction method. The advantage lies in the design of the column base steel frame, which ensures both the subsequent installation of hollow end columns and the connection between the steel frame and the pile can simultaneously withstand pull-out and compressive forces, exhibiting strong applicability. The construction and construction of the pile driving platform in this invention are well-matched, providing a guarantee for the construction of prefabricated foundations. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the prefabricated foundation structure of the present invention.

[0022] Figure 2 This is a schematic diagram of the column base steel frame structure of the present invention.

[0023] Figure 3 This is a schematic diagram showing the connection between the column base steel frame and the pile foundation.

[0024] Figure 4 This is a schematic diagram of the pile driving platform and the fixed tie rod structure.

[0025] Figure 5 This is a schematic diagram of the structure of the present invention. Detailed Implementation

[0026] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The described embodiments are only for illustration and explanation of the present invention and do not constitute the only limitation of the present invention.

[0027] like Figures 1-5 As shown in the figure, an embodiment of the present invention provides a fully prefabricated integral elevator foundation structure, including a prefabricated foundation a, column base steel frame b, pile driving platform c, and fixed tie rod d, with the hollow end column and the inner side of the hollow end column being set as a rough surface.

[0028] The precast foundation a includes a base plate a1, a first hollow end column a2, a second hollow end column a3, a pit sidewall a4, a lifting nail a5, a lifting ring a6, and a pile plate fixing component a7; a plurality of first hollow end columns a2 and second hollow end columns a3, a pit sidewall a4 is provided between adjacent second hollow end columns a3, the lifting nail a5 is provided on the top of the pit sidewall a4, the lifting ring a6 is provided on the base plate of the first hollow end column a2, and a plurality of pile plate fixing components a7 are provided on the outer side of the pit sidewall a4.

[0029] The column base steel frame b includes an I-shaped steel frame b1, first welded studs b2, a column base plate b3, column base anchor bars b4, and anchor bar end plates b5. Several first welded studs b2 are arranged sequentially on both sides of the I-shaped steel frame b1. The bottom of the I-shaped steel frame b1 is fixedly supported on the column base plate b3. Several anchor bars b4 are distributed on the bottom surface of the column base plate b3, and the bottom of each anchor bar b4 is fixed with an anchor bar end plate b5. The column base steel frame b is placed on the first hollow end column and / or the second hollow end column a3 and poured with quick-hardening fine aggregate concrete, realizing the transition and connection between the precast foundation a, the pile foundation, and the superstructure. The precast foundation a and the column base steel frame b are ultimately integrated using quick-hardening fine aggregate concrete, serving as a permanent structural component. The pile driving platform c serves as a construction auxiliary tool and is used in conjunction with the precast foundation a. The connection between the precast foundation and the pile driving platform is an integral connection via several tie rods and pre-embedded lifting rings or fixing components. There are four anchor bars b4 and four anchor bar end plates b5 at the column base, and semi-circular notches are provided on both sides of the column base plate b3.

[0030] The pile driving platform c includes a steel plate c1 and a second welded stud c2; the pile driving platform c is connected to the precast foundation a as a whole by a fixed tie rod d, and the anchor static pressure pile reaction frame is fixed to the pile driving platform.

[0031] A method for constructing a fully prefabricated, integral elevator foundation includes the following steps:

[0032] Step 1: Foundation layout; Based on the design drawings, the planar position of the precast foundation a is determined on site to ensure that the relative positional relationship between the precast foundation a and the existing building is accurate;

[0033] Step 2: Excavation of the foundation pit; excavate the foundation pit according to the layout lines. Before excavation, the excavation depth should be determined. During the excavation process, a non-sloped foundation pit should be used. The excavation depth and the bottom elevation of the pit should be monitored, and over-excavation is strictly prohibited. After excavating to the design elevation, no concrete cushion layer should be set, but the bottom of the pit should be kept flat.

[0034] Step 3: Place the precast foundation a; using a truck crane, the precast foundation a is lifted to the designed position through the lifting points reserved on the precast foundation, and the horizontal and vertical positions of the precast foundation a are re-measured and adjusted to ensure the accuracy and precision of the installation position;

[0035] Step 4: Backfilling; After the precast foundation a is placed, backfill soil in layers, evenly, and compact it immediately. During backfilling and compaction, ensure the position of the precast foundation remains unchanged.

[0036] Step 5: Install the pile driving platform c; lift the pile driving platform c and place it on the precast foundation a, ensuring that the centroids of the pile driving holes on the pile driving platform c coincide with those of the first hollow end column a2 and the second hollow end column a3. Connect the pile driving platform c and the precast foundation a into a whole using the lifting ring a6 and the pile plate fixing parts a7 pre-installed on the precast foundation a, and with the help of the fixing tie rod d.

[0037] Step 6: Place the counterweight; After determining the weight of the counterweight based on the pile foundation bearing capacity provided in the design, combined with the survey documents and construction experience, place the counterweight.

[0038] Step 7: Drive the piles one by one; when driving the piles, drive the two ends first and then the middle to ensure that the foundation position does not deviate significantly after driving the piles.

[0039] Step 8: Remove the pile driving platform c; After the pile driving is completed, the pile driving platform c should be removed in time, and the elevation and plane position of the precast foundation a should be re-measured to ensure that there are no errors before proceeding to the next process;

[0040] Step 9: Place the column base steel frame b; Place and fix the six column base steel frames b in sequence. When placing the column base steel frames b, the top and bottom elevations, verticality and planar position should be accurately measured and positioned, and certain measures should be taken to fix the column base steel frames b.

[0041] Step 10: Pour quick-hardening micro-expansion concrete; use quick-hardening micro-expansion concrete with good fluidity to pour the hollow areas of the first hollow end column a2 and the second hollow end column a3. Simultaneously, use a vibrator to compact the concrete, passing through the semi-circular notch in the column base plate b3 to ensure the quality of the connection joint. After the concrete is poured, appropriate curing measures should be taken. Once the strength reaches the design requirements, the superstructure can be installed.

[0042] Step 11: Precast foundation construction completed.

[0043] The technical solution of this invention is to use a precast foundation a with hollow end columns as the foundation of the elevator superstructure; a pile driving platform c is connected to the precast concrete foundation a as a whole by a fixed tie rod d; an anchor static pressure pile reaction frame is fixed to the pile driving platform, and during pile driving, the pile foundation is driven to the design elevation through the first hollow end column a2 or the second hollow end column a3; the column base steel frame b is placed on the first hollow end column a2 or the second hollow end column a3 and quick-hardening fine stone concrete is poured to realize the transition and connection between the precast foundation a, the pile foundation and the superstructure; 5. The precast foundation a and the column base steel frame b are finally integrated by quick-hardening fine stone concrete to form a whole, serving as a permanent structural component. The pile driving platform c is a construction auxiliary tool, used in conjunction with the precast foundation a, and is removed after pile driving is completed, not constituting the final engineering entity.

[0044] The embodiments of the present invention have the following advantages

[0045] 1. Production: The components are of uniform size, enabling mass production; steel molds are used, resulting in high-quality finished components, and the steel molds can be reused.

[0046] 2. Transportation: The small size ensures the transport of prefabricated foundations under various road conditions;

[0047] 3. Construction aspects: Reduces on-site earthwork excavation and concrete pouring, greatly shortening the construction period;

[0048] 4. Environmental aspects: Minimize the impact on existing buildings and reduce the impact on residents' convenience.

[0049] 5. Economic aspects: Mass production has high efficiency, low unit product cost, and strong market value;

[0050] 6. Risks: The excavation area of ​​the foundation pit is small, the exposure time is short, and the construction risk is low.

[0051] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A fully prefabricated integral elevator foundation structure, characterized in that: The prefabricated integral elevator foundation structure includes a prefabricated foundation (a), column base steel frame (b), pile driving platform (c), and fixed tie rod (d). The precast foundation (a) includes a base plate (a1), a first hollow end column (a2), a second hollow end column (a3), a pit sidewall (a4), a lifting nail (a5), a lifting ring (a6), and a pile plate fixing component (a7); a plurality of first hollow end columns (a2) and second hollow end columns (a3) ​​are arranged in sequence on the base plate (a1), a pit sidewall (a4) is provided between adjacent second hollow end columns (a3), the lifting nail (a5) is provided on the top of the pit sidewall (a4), the lifting ring (a6) is provided on the base plate of the first hollow end column (a2), and a plurality of pile plate fixing components (a7) are provided on the outer side of the pit sidewall (a4); The column base steel frame (b) includes an I-shaped steel (b1), a first weld stud (b2), a column base plate (b3), column base anchor bars (b4), and anchor bar end plates (b5); a plurality of first weld studs (b2) are arranged in sequence on both sides of the I-shaped steel (b1), the bottom of the I-shaped steel (b1) is fixedly supported on the column base plate (b3), and a plurality of anchor bars (b4) are provided on the bottom surface of the column base plate (b3), with the bottom of each anchor bar (b4) fixed to the anchor bar end plate (b5); the column base steel frame (b) is placed on the first hollow end column (a2) and the second hollow end column (a3) ​​and quick-hardening fine stone concrete is poured to realize the transition and connection between the precast foundation (a) and the pile foundation and the superstructure. The precast foundation (a) and the column base steel frame (b) are matched and finally formed as a whole by quick-hardening fine stone concrete, serving as a permanent structural component; the pile driving platform (c) serves as a construction auxiliary tool and is matched with the precast foundation (a). The pile driving platform (c) includes a steel plate (c1) and a second weld stud (c2); the pile driving platform (c) is connected to the precast foundation (a) as a whole by a fixed tie rod (d), and the anchor static pressure pile reaction frame is fixed to the pile driving platform.

2. The fully prefabricated integral elevator foundation structure according to claim 1, characterized in that: The inner sides of the first hollow end post and the second hollow end post are roughened.

3. The fully prefabricated integral elevator foundation structure according to claim 2, characterized in that: The I-shaped steel (b1) has two rows of first welding studs (b2) on its two sides. The I-shaped steel (b1), column base plate (b3), column base anchor bar (b4), and anchor bar end plate (b5) are designed as a whole.

4. The fully prefabricated integral elevator foundation structure according to claim 2 or 3, characterized in that: The column base anchor bar (b4) and anchor bar end plate (b5) are each provided with 4 units, and the column base plate (b3) has semi-circular notches on both sides.

5. The fully prefabricated integral elevator foundation structure according to claim 4, characterized in that: The precast foundation is connected to the pile driving platform by means of several tie rods and pre-embedded lifting rings or fasteners in an integral manner.

6. A construction method for a fully prefabricated integral elevator foundation, comprising the following steps: Step 1: Foundation layout; Based on the design drawings, the plan position of the precast foundation (a) is determined on site to ensure that the relative positional relationship between the precast foundation (a) and the existing building is accurate; Step 2: Excavation of the foundation pit; excavate the foundation pit according to the layout lines; before excavation, the excavation depth should be determined; during the excavation process, a non-sloping foundation pit should be adopted, and the excavation depth and the bottom elevation of the pit should be monitored. Over-excavation is strictly prohibited; after excavating to the design elevation, no concrete cushion layer should be set, but the bottom of the pit should be kept flat. Step 3: Place the precast foundation (a); Use a truck crane to lift the precast foundation (a) to the design position through the lifting points reserved on the precast foundation, and re-measure and adjust the horizontal and vertical positions of the precast foundation (a) to ensure the accuracy and precision of the installation position; Step 4: Backfilling; After the precast foundation (a) is placed, backfill soil in layers and compact it immediately; During the backfilling and compaction process, the position of the precast foundation should remain unchanged; Step 5: Install the pile driving platform (c); lift the pile driving platform (c) and place it on the precast foundation (a), with the centroids of the pile driving holes on the pile driving platform (c) and the first hollow end column (a2) and the second hollow end column (a3) ​​coinciding; connect the pile driving platform (c) and the precast foundation (a) into a whole through the lifting rings (a6) and pile plate fixing parts (a7) reserved on the precast foundation (a) and with the help of the fixing tie rods (d); Step 6: Place the counterweight; After determining the weight of the counterweight based on the pile foundation bearing capacity provided in the design, combined with the survey documents and construction experience, place the counterweight. Step 7: Drive the piles one by one; when driving the piles, drive the two ends first and then the middle to ensure that the foundation position does not deviate significantly after driving the piles. Step 8: Remove the pile driving platform (c); After the pile driving is completed, the pile driving platform (c) should be removed in time, and the elevation and plane position of the precast foundation (a) should be re-measured to ensure that there are no errors before proceeding to the next process; Step 9: Place the column base steel frame (b); Place and fix the six column base steel frames (b) in sequence. When placing the column base steel frame (b), accurately measure and position its top and bottom elevations, verticality and planar position, and take certain measures to fix the column base steel frame (b). Step 10: Pour quick-hardening micro-expansion concrete; Use quick-hardening micro-expansion concrete with good fluidity to pour the hollow areas of the first hollow end column (a2) and the second hollow end column (a3). At the same time, a vibrator should be used for vibration. The vibrator should pass through the semi-circular notch of the column base plate (b3) to vibrate the concrete below to ensure the pouring quality of the connection joint; After the concrete is poured, appropriate curing measures should be taken. After the strength reaches the design requirements, the installation of the superstructure can be carried out. Step 11: Precast foundation construction completed.

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