Reinforcement cage structure suitable for cast-in-place pile construction of coastal tidal liquefaction site
By setting up a reinforcement structure on the upper part of the steel cage, the impact of tides and liquefied soil layers on the cast-in-place piles was resolved, the stability and shear resistance of the cast-in-place piles were improved, and the construction quality of the cast-in-place piles in the coastal tidal liquefaction site was ensured.
Patent Information
- Application Number
- CN202520217788.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-11
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-02-11
AI Technical Summary
In existing technologies, tidal and liquefied soil layers have a significant impact on cast-in-place piles, resulting in poor pile quality and insufficient ability of cast-in-place piles to resist the effects of tidal and liquefied soil layers.
A reinforced cage structure suitable for coastal tidal liquefaction sites was designed. By setting a reinforcing structure on the upper part of the reinforced cage, including composite hoops and stirrups, the main reinforcement is restricted from deviating from the cage space, the tying effect of the main reinforcement is enhanced, and the shear resistance and resistance to tidal rise and fall of the cast-in-place pile are improved.
It enhances the stability and shear resistance of cast-in-place piles in tidal and liquefied environments, improves pile quality, and ensures the construction effect of cast-in-place piles under complex geological conditions.
Smart Images
Figure CN223867535U_ABST
Abstract
Description
Technical Field
[0001] This utility model patent relates to the technical field of cast-in-place piles, and more specifically, to a steel cage structure suitable for cast-in-place pile construction in coastal tidal liquefaction sites. Background Technology
[0002] The "Xiaomo Port Trade and Logistics Park Area A South Warehouse (including access road) Earthwork and Pile Foundation Project" is located in Xiaomo Town, Shenzhen-Shantou Special Cooperation Zone. The project is situated north of Gangqu Road 1, Da'ao Village, Binhai, with the Da'ao River flowing 100m to the south and the coastal area 350m to the south, creating a hydraulic connection with the project's groundwater. The site was originally a fishpond area. The project covers an area of approximately 35,000 square meters, with a building area of approximately 96,000 square meters. It will construct a 5-story warehouse with a 4-story truck access road, reaching a height of 41.3 meters, and will not include a basement. The warehouse foundation design utilizes bored piles, with 1800mm diameter piles embedded 11m into moderately weathered rock or 1m into slightly weathered rock at the bottom, averaging approximately 43m in length.
[0003] Based on the analysis of the surrounding environment and survey data, the main engineering problems faced by the rotary drilling pile construction project are that the coastal area is affected by sea tides, and the groundwater level in the site fluctuates greatly due to the tides, with the maximum change in water level reaching 4.0m; the thick silt layer and silt-containing silt layer distributed on the upper part of the site have high liquefaction index and the overall liquefaction level is serious, with an average thickness of 11m, and the site is distributed in layers.
[0004] In existing technologies, after the cast-in-place pile is formed, the tidal and liquefied soil layers have a significant impact on the pile body, resulting in poor pile quality and poor ability of the cast-in-place pile to resist the effects of tidal and liquefied soil layers. Utility Model Content
[0005] The purpose of this invention is to provide a steel cage structure suitable for the construction of cast-in-place piles in coastal tidal liquefaction sites, aiming to solve the problem that the tidal and liquefied soil layers have a significant impact on the pile body, resulting in poor pile quality in the existing technology.
[0006] This utility model is implemented as follows: a steel cage structure applicable to the construction of cast-in-place piles in coastal tidal liquefaction sites includes multiple longitudinally arranged main bars, which extend along the axial direction of the steel cage structure. Stirrups surround the outer periphery of the multiple main bars. The multiple main bars are arranged at intervals to form a cage space. A reinforcement section is formed at the upper part of the cage space. Multiple horizontally arranged reinforcement structures are provided in the reinforcement section. The reinforcement structures are connected to the multiple main bars and restrict the main bars from deviating outward from the cage space.
[0007] Optionally, the reinforcing structure includes a composite hoop with multiple bends on its periphery. The bends bypass the outside of the main reinforcement bars and are fixedly connected to the main reinforcement bars, pressing against the main reinforcement bars from the outside in, thus restricting the main reinforcement bars from deviating outward from the cage space.
[0008] Optionally, the composite hoop is square, and four bends are formed on its periphery.
[0009] Optionally, the reinforcing structure includes two horizontally stacked composite hoops, which are fixedly connected to each other.
[0010] Optionally, the two horizontally stacked composite hoops have multiple overlapping positions, which are arranged at intervals along the circumference of the composite hoops. The overlapping positions are bound together with steel wire to fix the two composite hoops together as one unit.
[0011] Optionally, the two horizontally stacked composite hoops are arranged orthogonally.
[0012] Optionally, the upper part of the main reinforcement forms a dense section, and a plurality of stirrups are connected to the outer periphery of the plurality of dense sections. The plurality of stirrups connected to the dense section are arranged vertically at intervals to form a first interval.
[0013] The lower part of the main reinforcement forms a lower section, and multiple stirrups are connected to the outer periphery of multiple lower sections. The multiple stirrups connected to the lower sections are arranged vertically at intervals to form a second interval; the length of the first interval is less than the length of the second interval.
[0014] The reinforcing cage structure is used to be lowered into the pile hole, which passes through the liquefied soil layer from top to bottom and extends downwards; after the reinforcing cage structure is placed in the pile hole, the reinforced section passes through the liquefied soil layer vertically.
[0015] Optionally, the length of the reinforced section along the length of the main reinforcement bar is 2.5m-3.0m;
[0016] After the steel cage structure is placed in the pile hole, the top of the reinforced section extends above the pile hole.
[0017] Optionally, the spacing between adjacent reinforcement structures is 100 mm.
[0018] Optionally, the stirrups are spiral stirrups, which are arranged spirally around the outer periphery of multiple main bars.
[0019] Compared with existing technologies, the steel cage structure provided by this utility model for the construction of cast-in-place piles in coastal tidal liquefaction sites faces the challenge of addressing the high liquefaction index of the deep silty sand and silt-containing silty sand layers distributed on the upper part of the site, which significantly impact the pile body. Therefore, a reinforcement structure is designed in the upper part of the steel cage, specifically in the reinforced section of the cage space, to strengthen the ties between the main reinforcement bars, improve the pile's resistance to the adverse effects of soil liquefaction, and also increase the pile's shear strength against the cyclical horizontal forces of tidal rise and fall. Attached Figure Description
[0020] Figure 1 This is a top view schematic diagram of the steel cage structure for the construction of cast-in-place piles in coastal tidal liquefaction sites provided by this utility model;
[0021] Figure 2 This is a schematic diagram of the arrangement of the main reinforcement bars and the reinforcing structure in the pile hole provided by this utility model;
[0022] Figure 3 This is a partial schematic diagram of the main reinforcement and stirrups provided by this utility model in the pile hole. Detailed Implementation
[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0024] The implementation of this utility model will be described in detail below with reference to specific embodiments.
[0025] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the 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, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.
[0026] Reference Figure 1-3 The image shown is a preferred embodiment of the present invention.
[0027] The present invention provides a steel cage structure suitable for the construction of cast-in-place piles in coastal tidal liquefaction sites, comprising multiple longitudinally arranged main bars 100, which extend along the axial direction of the steel cage structure, and are surrounded by stirrups 200. The multiple main bars 100 are arranged at intervals to form a cage space 101, and a reinforcement section is formed at the upper part of the cage space 101. The reinforcement section is provided with multiple horizontally arranged reinforcement structures 300, which are connected to the multiple main bars 100 and restrict the main bars 100 from deviating outward from the cage space 101.
[0028] The aforementioned reinforced cage structure for cast-in-place pile construction in coastal tidal liquefaction sites has a significant impact on the pile body due to the high liquefaction index of the deep silty sand layer 10 and the silty sand layer 20 distributed on the upper part of the site. Therefore, a reinforcing structure 300 is designed in the upper part of the reinforced cage, i.e., the reinforced section of the cage space 101, to strengthen the ties between the main reinforcement bars 100 of the reinforced cage, improve the resistance of the cast-in-place pile to the adverse effects of soil liquefaction, and also increase the shear resistance of the cast-in-place pile to the cyclical horizontal action of tidal rise and fall.
[0029] The reinforcing structure 300 includes a composite hoop 310. The composite hoop 310 has multiple bends 311 on its periphery. These bends 311 bypass the outer side of the main reinforcement bar 100 and are fixedly connected to it, pressing against the main reinforcement bar 100 from the outside in, thus restricting the main reinforcement bar 100 from deviating outward from the cage space 101. In this way, through the design of the bends 311, the composite hoop 310 can pass through and re-enter the cage space 101, allowing the bends 311 to press against the main reinforcement bar 100 from the outside in, thereby strengthening the connection between the main reinforcement bar 100 and the reinforcement bar.
[0030] Specifically, the composite hoop 310 is square, and four bend areas 311 are formed on its periphery. In this way, the four bend areas 311 of the square composite hoop 310 are evenly distributed, which can more effectively compress and fix the main reinforcement 100. Compared with the irregularly shaped reinforcement structure 300, the four right-angle design of the square composite hoop 310 can reduce stress concentration and make the force distribution more uniform.
[0031] Specifically, the reinforcement structure 300 includes two horizontally stacked composite hoops 310, which are fixedly connected to each other. This double reinforcement enhances stability. At the same time, by increasing the number of stress points acting on the main reinforcement 100, the spacing between multiple stress points along the circumference of the steel cage is more uniform, making it more stable and reliable in the face of complex geological conditions such as tides and liquefaction.
[0032] The two horizontally stacked composite hoops 310 have multiple overlapping positions, which are arranged at intervals along the circumference of the composite hoops 310. The overlapping positions are bound together with steel wire to fix the two composite hoops 310 into a single unit. In this way, a fixed connection is achieved by binding steel wire at the overlapping positions.
[0033] The two horizontally stacked composite hoops 310 are arranged orthogonally. This arrangement, with the cage space 101 being cylindrical, results in more uniform spacing between multiple stress points along the circumference of the reinforcing cage, making it more stable and reliable in the face of complex geological conditions such as tides and liquefaction.
[0034] The upper part of the main reinforcement 100 forms a dense section 1000, and multiple stirrups 200 are connected to the outer periphery of the multiple dense sections 1000. The multiple stirrups 200 connected to the dense section 1000 are arranged vertically at intervals to form the first interval.
[0035] The lower part of the main reinforcement 100 forms a lower section, and multiple stirrups 200 are connected to the outer periphery of multiple lower sections. The stirrups 200 connected to the lower sections are arranged vertically at intervals to form a second interval; the length of the first interval is less than the length of the second interval.
[0036] The reinforcing cage structure is lowered into the pile hole, which extends downwards through the liquefiable soil layer. Once the reinforcing cage structure is placed in the pile hole, the reinforced section 1000 extends vertically through the liquefiable soil layer. This results in a denser arrangement of the stirrups 200 on the reinforcing cage structure located in the liquefiable soil layer. The lower section penetrates the gravel layer 30 and below, minimizing the impact on the lower section, thus eliminating the need for a denser arrangement of the stirrups 200. When the stirrups 200 are spiral reinforcement, the upper section has more turns per unit length.
[0037] The bottom of the 1000-meter-high section is 1 meter below the bottom of the liquefiable soil layer.
[0038] Specifically, along the length of the main reinforcement bar 100, the length of the reinforced section is 2.5m-3.0m;
[0039] After the reinforcing cage structure is placed in the pile hole, the top of the reinforced section extends above the pile hole. In this way, multiple reinforced structures 300 are arranged along a set distance downward from the pile top to enhance the shear resistance of the cast-in-place pile.
[0040] Specifically, the interval between adjacent reinforcing structures 300 is 100mm. In this way, a reinforcing structure 300 is arranged every 100mm in the reinforcing section.
[0041] Specifically, the stirrup 200 is a spiral stirrup 200, which is arranged spirally around the outer periphery of multiple main bars 100.
[0042] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A reinforced cage structure suitable for cast-in-place pile construction in coastal tidal liquefaction sites, characterized in that, It includes multiple longitudinally arranged main bars, which extend along the axial direction of the steel cage structure. Stirrups surround the outer periphery of the multiple main bars. The multiple main bars are arranged at intervals to form a cage space. A reinforcement section is formed at the upper part of the cage space. The reinforcement section is provided with multiple horizontally arranged reinforcement structures. The reinforcement structures are connected to the multiple main bars and restrict the main bars from deviating outward from the cage space.
2. The reinforced cage structure for cast-in-place pile construction in coastal tidal liquefaction sites as described in claim 1, characterized in that, The reinforcement structure includes a composite hoop with multiple bends on its periphery. These bends bypass the outer side of the main reinforcement bars and are fixedly connected to them, pressing against the main reinforcement bars from the outside in and restricting them from deviating outward from the cage space.
3. The reinforced cage structure for cast-in-place pile construction in coastal tidal liquefaction sites as described in claim 1, characterized in that, The composite hoop is square, and four bends are formed on its periphery.
4. The reinforced cage structure for cast-in-place pile construction in coastal tidal liquefaction sites as described in claim 2, characterized in that, The reinforcement structure includes two composite hoops that are horizontally stacked one above the other, and the two composite hoops are fixedly connected to each other.
5. The reinforced cage structure for cast-in-place pile construction in coastal tidal liquefaction sites as described in claim 4, characterized in that, The two horizontally stacked composite hoops have multiple overlapping positions, which are arranged at intervals along the circumference of the composite hoops. The overlapping positions are bound together with steel wire to fix the two composite hoops together as a whole.
6. The reinforced cage structure for cast-in-place pile construction in coastal tidal liquefaction sites as described in claim 4, characterized in that, The two composite hoops, which are horizontally stacked one above the other, are arranged orthogonally.
7. The reinforced cage structure for cast-in-place pile construction in coastal tidal liquefaction sites as described in claim 1, characterized in that, The upper part of the main reinforcement forms a dense section, and the outer periphery of the multiple dense sections is connected to multiple stirrups. The multiple stirrups connected to the dense sections are arranged vertically at intervals to form a first interval. The lower part of the main reinforcement forms a lower section, and multiple stirrups are connected to the outer periphery of multiple lower sections. The multiple stirrups connected to the lower sections are arranged vertically at intervals to form a second interval; the length of the first interval is less than the length of the second interval. The reinforcing cage structure is used to be lowered into the pile hole, which passes through the liquefied soil layer from top to bottom and extends downwards; after the reinforcing cage structure is placed in the pile hole, the reinforced section passes through the liquefied soil layer vertically.
8. The reinforced cage structure for cast-in-place pile construction in coastal tidal liquefaction sites as described in claim 6, characterized in that, Along the length of the main reinforcement bar, the length of the reinforced section is 2.5m-3.0m; After the steel cage structure is placed in the pile hole, the top of the reinforced section extends above the pile hole.
9. The reinforced cage structure for cast-in-place pile construction in coastal tidal liquefaction sites as described in claim 8, characterized in that, The spacing between adjacent reinforcement structures is 100 mm.
10. The reinforced cage structure for cast-in-place pile construction in coastal tidal liquefaction sites as described in claim 1, characterized in that, The stirrups are spiral stirrups, which are arranged spirally around the outer periphery of multiple main bars.