A basement high-low span pipe pile and structure combined supporting system

Abstract

The application discloses a basement high-low span pipe pile and structure combined supporting system, which comprises a plurality of prefabricated pipe piles, a crown beam, a high-span bottom plate and a low-span floor slab. The prefabricated pipe piles are arranged in sequence. The crown beam is located at the top of the prefabricated pipe piles. The high-span bottom plate is located at the top of each prefabricated pipe pile and connected to the crown beam. The low-span floor slab is located at one side of the prefabricated pipe piles, and the low-span floor slab is lower than the high-span bottom plate. The side of the prefabricated pipe pile facing the low-span floor slab is covered with a concrete slope protection. The application adopts a plurality of prefabricated pipe piles, the pipe pile material can be mass-produced in a factory, single-section pile construction does not need to connect piles, the pipe body has high structural strength and strong lateral compression resistance, can bear certain soil load, and the pipe pile construction is not affected by soil quality and underground water, the construction quality is easy to control, the construction difficulty is small, the progress is fast, the influence on the surrounding environment is small, the construction speed is fast, the construction process is simple, and the cost is low.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit support construction technology, specifically to a basement high and low span pipe pile and structure combined support system. Background Technology

[0002] In building construction, especially when encountering situations involving different levels or staggered floors in basement construction, the existing technology often employs cantilever pile support construction. This process can be understood as "building the wall first, then excavating the soil," meaning that excavation is first carried out at the boundary of the staggered floor to the lower floor elevation, then a row of concrete piles is constructed at the excavation boundary to form an "underground retaining wall," and then the higher and lower floors are excavated in layers under its protection. However, this process is prone to borehole collapse in deep gravel layers with high groundwater levels, and many factors affect quality, making construction quality control difficult and risky. Furthermore, it requires large drilling rigs and high-performance machinery, as well as a large construction site. The mechanical performance requirements for construction equipment are high, and the large equipment generates significant vibrations during construction, having a considerable impact on the surrounding environment. The entire construction process is complex, and material and construction costs are relatively high. Existing technologies also use SMW (Surface Mount Welded Wrap) piles and sheet piles for support, but these all suffer from low lateral stiffness, resulting in higher quality and safety risks.

[0003] In view of the above, this utility model is hereby proposed. Utility Model Content

[0004] To solve one of the above-mentioned technical problems, this utility model provides a basement support system that combines high and low span pipe piles with structure.

[0005] This application provides the following technical solution: A basement support system combining high and low span pipe piles with structural support includes: Multiple precast pipe piles, each precast pipe pile is arranged in sequence; A capping beam, located at the top of the precast pipe pile; A high-span base slab, which is located on top of each precast pipe pile and connected to the capping beam; A low-span floor slab, located on one side of the precast pipe pile, is lower than the high-span floor slab; The side of the precast pipe pile facing the low-span floor slab is covered with a concrete slope protection.

[0006] Optionally, the pipe pile has a core cavity, and the capping beam has capping beam reinforcement; The core steel bars are partially located in the core cavity and partially extend into the cap beam steel bars.

[0007] Optionally, the core steel bar includes a plurality of longitudinal steel bars, each of which extends along the height direction of the precast pipe pile and extends into the cap beam steel bar, and a sealing element is provided on the longitudinal steel bar.

[0008] Optionally, the sealing element is a water-swellable sealing strip; The water-swellable sealing strip is located outside the core cavity of the tube and is sleeved on the longitudinal reinforcing bar.

[0009] Optionally, the bottom slab reinforcement of the high-span base plate extends to or through the capping beam reinforcement.

[0010] Optionally, one end of some of the bottom plate reinforcement bars located within the capping beam is bent to form a bent section.

[0011] Optionally, the basement high-low span pipe pile and structure combined support system includes structural slabs; The structural plate and the high-span base plate are located on the same horizontal plane; Some of the bottom slab reinforcement bars of the high-span base plate extend into the structural slab.

[0012] Optionally, a water-stop steel plate is provided at the joint between the high-span base plate and the structural plate.

[0013] Optionally, the core concrete of the pipe pile, the high-span bottom slab, and the capping beam are formed by integrally casting concrete in one go.

[0014] Optionally, a monitoring device is installed on the cap beam to monitor horizontal displacement, settlement, and deformation data.

[0015] By adopting the above technical solution, this application has the following beneficial effects: This application uses multiple precast pipe piles. The pipe pile materials can be mass-produced in the factory. Single-section pile construction does not require splicing. The pipe body structure has high strength and strong lateral compressive strength, and can withstand a certain soil load. Moreover, the construction of pipe piles is not affected by soil quality and groundwater. The construction quality is easy to control, the construction difficulty is small, the progress is fast, the impact on the surrounding environment is small, the construction speed is fast, the construction procedure is simple, and the cost is low. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but do not constitute an undue limitation of the present invention. Obviously, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0017] Figure 1A top view of the basement high-low span pipe pile and structure support system provided in this embodiment of the utility model; Figure 2 A side view of the basement high-low span pipe pile and structure support system provided in this embodiment of the utility model; Figure 3 This is a partial structural cross-sectional view of the basement high and low span pipe pile combined with structure provided in an embodiment of the present utility model.

[0018] In the diagram: 1. Pipe pile, 11. Pipe core cavity, 2. Crown beam, 21. Crown beam reinforcement, 3. High-span bottom slab, 31. Bottom slab reinforcement, 31. Bent section, 311. Low-span floor slab, 4. Concrete slope protection, 5. Reinforcing mesh reinforcement, 51. Sealing element, 6. Structural slab, 7. Waterstop steel plate, 8. Counterbalance soil platform, 9. Pipe core reinforcement, 10. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0020] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] like Figures 1 to 3As shown in the illustration, this application provides a basement support system combining high and low span pipe piles and structure, including: multiple precast pipe piles 1, a capping beam 2, a high-span base slab 3, and a low-span floor slab 4. The precast pipe piles 1 are arranged sequentially. The pipe piles 1 are suitable for fill layers, sand layers, clay layers, and soil-like weathered strata, and have a fast pile formation speed, high pile body strength and lateral compressive strength, can withstand certain soil loads, and have high safety in use. The capping beam 2 is located on top of the precast pipe piles 1. The high-span base slab 3 is located on top of each precast pipe pile 1 and connected to the capping beam 2. The low-span floor slab 4 is located on one side of the precast pipe piles 1, and the low-span floor slab 4 is lower than the high-span base slab 3. The side of the precast pipe piles 1 facing the low-span floor slab 4 is covered with a concrete slope protection 5. Reinforcing steel mesh 51 is laid on the concrete slope protection 5 to strengthen the structure. This application uses multiple precast pipe piles 1. The pipe pile 1 material can be mass-produced in the factory. Single-section pile construction does not require pile splicing. The pipe body structure has high strength and strong lateral compressive strength. It can withstand a certain soil load. Moreover, the construction of pipe pile 1 is not affected by soil quality and groundwater. The construction quality is easy to control. The construction difficulty is small and the progress is fast. It has little impact on the surrounding environment. The construction speed is fast, the construction procedure is simple, and the cost is low.

[0023] The pipe pile 1 has a core cavity 11, and the capping beam 2 has capping beam reinforcement 21. The core reinforcement 10 is partially located within the core cavity 11 and partially extends into the capping beam reinforcement 21 (such as a reinforcement cage). The core cavity 11 is sealed with micro-expansion concrete within a height of approximately 1.5m from the top of the pipe pile 1. A reinforcement cage can be constructed using steel bars, and part of the reinforcement cage extends into the core cavity 11, so that the core reinforcement 10 is partially located within the core cavity 11 and partially extends into the capping beam reinforcement 21. After the capping beam 2 is poured, to ensure a tight connection between the pipe pile 1 and the capping beam 2, the micro-expansion concrete can be C30 grade, which has high structural strength. The core reinforcement 10 can be 6C20 grade, which also has high structural strength.

[0024] The core steel bar 10 includes multiple longitudinal steel bars, each of which extends along the height direction of the precast pipe pile 1 and extends into the cap beam steel bar 21. A sealing element 6 is provided on the longitudinal steel bar. The sealing element 6 has the function of stopping and blocking water.

[0025] In one possible implementation, the sealing element 6 is a water-swellable sealing strip located outside the core cavity 11 and sleeved on the longitudinal reinforcing bar. The core reinforcing bar 10 outside the core cavity 11 is the longitudinal reinforcing bar, and the water-swellable sealing strip can be easily inserted from the end of the longitudinal reinforcing bar. This sleeved installation method is convenient and easy to operate.

[0026] The bottom plate reinforcement 31 of the high-span base slab 3 extends to or through the capping beam reinforcement 21. The high-span base slab 3 and the capping beam 2 can be cast integrally and connected to form an integral structure with high structural strength.

[0027] One end of the bottom slab reinforcement 31 located within the capping beam 2 is bent to form a bent section 311. The bent section 311 extends along the thickness direction of the high-span bottom slab, that is, it can extend towards the core cavity 11, enhancing the integrated effect of the capping beam 2 and the high-span bottom slab 3, resulting in high structural strength of the connection between the two, and also improving the safety of the basement high-low span pipe pile and structure combined support system of this application.

[0028] In one possible implementation, the basement's high-low span pipe pile and structural support system includes a structural slab 7. The structural slab 7 and the high-span base slab 3 are located on the same horizontal plane, and some of the bottom slab reinforcement 31 of the high-span base slab 3 extends into the structural slab 7. The high-span base slab 3 and the structural slab 7 are connected to form an integral structure, resulting in high structural strength and good integrity.

[0029] In one possible implementation, a water-stop steel plate 8 is provided at the joint between the elevated base plate 3 and the structural plate 7. A gap exists between the elevated base plate 3 and the structural plate 7, and the water-stop steel plate 8 serves to stop water seepage through the gap.

[0030] The core concrete of the pipe pile 1, the high-span bottom slab 3, and the capping beam 2 are formed by integral one-time concrete pouring. Compared with the existing technologies such as cantilever cast-in-place piles, SMW method piles, and sheet pile support, this structure has the advantages of guaranteed construction quality, high construction safety, and fast construction speed. At the same time, it has little impact on the surrounding environment and, combined with geological conditions, effectively solves the difficulties faced in the construction of cantilever cast-in-place piles.

[0031] In one possible implementation, a monitoring device (not shown) is installed on the cap beam 2 to monitor horizontal displacement, settlement, and deformation data. Monitoring can be conducted manually combined with real-time data uploads from the monitoring device to ensure construction safety.

[0032] The construction steps of the basement high-low span pipe pile and structural support system of this application are as follows: Step 1: Site leveling. The construction area is leveled using an excavator, bringing the ground to the designed construction elevation.

[0033] Step Two: Measurement and Positioning. Based on the design drawings and after leveling the site, and according to the specified spacing requirements of the pipe piles 1, control pile leveling points are set up near the construction area of ​​pipe piles 1 using the axis control network and control points to accurately mark the pile positions. Control points are set up outside the range unaffected by pile driving to control the axis and elevation of the pipe piles.

[0034] Step 3: Positioning the piling machine.

[0035] ① First, a long spiral is used to drill a pilot hole at the location of pipe pile 1. The diameter of the pilot hole is smaller than the diameter of pipe pile 1, and the diameter of the pilot hole can be 90% of the diameter of pipe pile 1. The depth of the pilot hole is smaller than the depth of pipe pile 1 in the design drawings. The pilot hole is used to reduce the soil squeezing effect generated by static pressure pipe pile 1 and to remove obstacles. If obstacles are encountered, they should be dealt with in a timely manner.

[0036] ② Subsequently, the static pressure pile driver was used for the driving of pipe pile 1. The ground bearing capacity was checked to ensure it met the requirements for the movement of the pile driver. A static pressure pile driver with a self-lifting function was used. The static pressure pile driver was moved to the pile position according to the pile driving sequence and aligned with the pile position. The static pressure pile driver was adjusted to a horizontal and stable state to ensure that the pile driver would not move or tilt during construction.

[0037] Step Four: Lifting, Centering, and Straightening of Pipe Pile 1. A 12m long high-strength pipe pile 1 can be used. Pipe pile 1 is fabricated in the factory and transported to the site for use. During construction, first secure the hoisting wire ropes and rigging, then use the rigging to bind the upper part of the pile. Start the pile driver to lift pipe pile 1 using a single-point lifting method, hoisting pipe pile 1 into the static pressure pile driver clamp, and inserting it into the pre-drilled hole for centering. After the pile body is stable, use two theodolites to measure the verticality of pipe pile 1. The verticality deviation of the pile body should not exceed 0.5%.

[0038] Step 5: Static pressure pile driving. The static pressure pile driver is equipped with sufficient counterweight according to the design and soil conditions. Before driving the pile on the original ground, the elevation mark in meters should be marked on the pile body, or an automatic pile driving recorder should be used to record the pile penetration depth and the pressure value at that depth in a timely manner. Static pressure pile driving is mainly controlled by the pile top elevation, and the pressure value is secondary. The holding pressure during static pile driving should not exceed 1.1 times the allowable lateral pressure of the pile body.

[0039] Step Six: When the pile is driven to the design elevation, the pile driving is terminated, and the pile driving construction is carried out on the original ground. The top elevation of the pile is located at the bottom elevation of the first basement level. After normal construction according to the design requirements, pipe pile 1 cannot reach the design elevation, so pile driving construction is required. When the last pile section is close to the ground, the pile needs to be driven. After the verticality of the pile is measured and the quality of the pile head is checked to be qualified, a steel pile driver is used to drive the pile. The pile driving is carried out continuously until the design pile top elevation is reached. The pile hole generated by the pile driving is backfilled in time.

[0040] Step Seven: Inspection and Acceptance. To prevent problems such as pile breakage, pile cap deformation, and pile tilting, the appearance quality of the pile body must be strictly inspected during transportation, lifting, and stacking to prevent pile breakage. Before starting pile driving, the verticality of the pile body should be adjusted so that its vertical axis is consistent with the vertical axis of the pile top plane. At the same time, the static pile driver should be horizontal and stable, and the pile head plate and the pile body should be kept on the same axis.

[0041] Step 8: The pile driver moves to the next pile for construction. The pile driver constructs pipe pile 1 in sequence according to the predetermined route, using a skip-one construction method to avoid quality problems such as displacement and breakage of adjacent pipe pile 1 caused by soil compaction, while also reducing the soil squeezing effect.

[0042] Step 9: Excavate the earthwork to the design elevation of the top of the high-span pile. Only after the construction of pipe pile 1 is completed can the excavation of the basement first-floor pit be carried out until the elevation of the top of the low-span floor slab 4 and pipe pile 1 is reached.

[0043] Step 10: Construction of the cap beam 2 and the high-span bottom slab 3.

[0044] ①Measure the spacing of the completed pipe piles 1, and process the matching cap beam reinforcement 21 according to the actual site conditions.

[0045] ② The concrete for the core of pipe pile 1 can be poured, and the core cavity within a height range of 1.5m from the top of the pile can be sealed with C30 micro-expansion concrete. The core steel reinforcement cage 10 uses 6C20, and the reserved steel reinforcement in the core extends into the cap beam 2 to meet the design requirements for anchorage length. ③ Install the finished cap beam reinforcement 21, core reinforcement 10 and bottom slab reinforcement 31 of the high-span bottom slab 3. The bottom slab reinforcement 31 is anchored into the cap beam 2 to form an integral steel mesh structure. ④ The water-stop steel plate 8 is installed at the joint between the high-span bottom plate 3 and the structural plate 7, and the water-swellable rubber water-stop strip is installed at the top of the core steel bar 10 to ensure the quality and effect of waterproofing.

[0046] ⑤ The cap beam reinforcement 21, the bottom slab reinforcement 31 of the high-span bottom slab 3 and the pipe pile 1 are cast together in one piece, and the pipe pile 1 and the high-span bottom slab 3 are structurally connected as one; Step 11: Excavation of the low-span foundation pit, excavation of the working face on the pile side, and trimming of the pile side slope. ① After the concrete pile 1 and the high-span base slab 3 structure are poured and their concrete strength reaches 80%, the low-span foundation pit can be excavated. The concrete slope protection 5 is sprayed on the side of the pile, and the wire mesh reinforcement 51 is laid at the same time. The sprayed concrete is carried out in layers and sections in sequence. Within the same section, the sprayed concrete sequence is from bottom to top, so as to support and spray concrete at any time. During the excavation process, attention should be paid to the protection of the pipe pile 1 and the observation of its deformation.

[0047] ② Before construction in step ten, according to the on-site construction plan and actual construction progress, a counterweight soil platform 9 can be reserved on the side of the low span of the basement near the pipe pile 1, see [link to relevant documentation]. Figure 1 As mentioned above, the remaining sections will continue to be excavated in different zones and layers until the bottom of the foundation pit is reached, and the low-span basement structure will be constructed without affecting the overall construction progress.

[0048] Step 12: Install the monitoring device on the crown beam 2.

[0049] The preferred embodiments disclosed above are merely illustrative of this application. The preferred embodiments do not exhaustively describe modifications and variations. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of this application, thereby enabling those skilled in the art to better understand and utilize this application. This application is limited only by the claims and their full scope and equivalents.

Claims

1. A basement support system combining high and low span pipe piles with structural support, characterized in that, include: Multiple precast pipe piles, each precast pipe pile is arranged in sequence; A capping beam, located at the top of the precast pipe pile; A high-span base slab, which is located on top of each precast pipe pile and connected to the capping beam; A low-span floor slab, located on one side of the precast pipe pile, is lower than the high-span floor slab; The side of the precast pipe pile facing the low-span floor slab is covered with a concrete slope protection.

2. The basement high-low span pipe pile and structural support system according to claim 1, characterized in that, The pipe pile has a core cavity, and the capping beam has capping beam reinforcement; The core steel bars are partially located in the core cavity and partially extend into the cap beam steel bars.

3. The basement high-low span pipe pile and structural support system according to claim 2, characterized in that, The core steel bar includes multiple longitudinal steel bars, each of which extends along the height direction of the precast pipe pile and extends into the cap beam steel bar, and a sealing element is provided on the longitudinal steel bar.

4. The basement high-low span pipe pile and structural support system according to claim 3, characterized in that, The sealing element is a water-swellable sealing strip; The water-swellable sealing strip is located outside the core cavity of the tube and is sleeved on the longitudinal reinforcing bar.

5. The basement high-low span pipe pile and structural support system according to claim 1, characterized in that, The bottom slab reinforcement of the high-span base plate extends to or through the capping beam reinforcement.

6. The basement high-low span pipe pile and structural support system according to claim 5, characterized in that, One end of the bottom plate reinforcement located within the cap beam is bent to form a bent section.

7. The basement high-low span pipe pile and structural support system according to claim 5, characterized in that, Including structural panels; The structural plate and the high-span base plate are located on the same horizontal plane; Some of the bottom slab reinforcement bars of the high-span base plate extend into the structural slab.

8. The basement high-low span pipe pile and structural support system according to claim 7, characterized in that, A water-stop steel plate is installed at the joint between the high-span base plate and the structural plate.

9. The basement high-low span pipe pile and structural support system according to any one of claims 1-8, characterized in that, The core concrete of the pipe pile, the high-span bottom slab, and the capping beam are formed by integrally pouring concrete in one go.

10. The basement high-low span pipe pile and structural support system according to any one of claims 1-8, characterized in that, A monitoring device is installed on the cap beam to monitor horizontal displacement, settlement, and deformation data.

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