Settlement buffer for high compressibility ground and use thereof

Abstract

The application provides a settlement buffering device for a high-compressibility foundation and an application thereof. The settlement buffering device comprises a spring telescopic structure; the spring telescopic structure comprises a rigid upper support, a rubber sleeve, a spring, a limiting groove, a steel sleeve pipe and a rigid lower base; the rigid upper support and the rigid lower base are both kept horizontal and arranged vertically; the spring is kept vertical, and the upper and lower ends of the spring are connected with the rigid upper support and the rigid lower base respectively; the limiting groove is fixed in the steel sleeve pipe; the steel sleeve pipe is sleeved outside the spring, and the upper and lower ends of the steel sleeve pipe are fixedly connected with the rigid upper support and the rigid lower base respectively; the rubber sleeve is sleeved outside the rigid upper support and the steel sleeve pipe, and the upper end of the rubber sleeve is fixed on the top of the rigid upper support, and the lower end of the rubber sleeve is fixed outside the steel sleeve pipe. The application improves the material of the rigid pile on the basis of the rigid pile composite foundation, realizes the coordinated deformation of the improved foundation and the surrounding original foundation and the accurate control of the post-treatment settlement of the foundation, and makes the ground of the site area flat and the slope change uniform.

Description

Technical Field

[0001] This invention relates to the fields of geotechnical engineering, foundation engineering, and foundation treatment technology, and in particular to a settlement buffer device suitable for highly compressible foundations and its application. Background Technology

[0002] When constructing a large-scale foundation treatment site, the engineering geological conditions in different areas may vary greatly. In particular, for soft soil foundations or high embankment foundations in mountainous and hilly areas, it is easy to encounter adverse geological problems such as uneven settlement of the foundation and large local settlement deformation. In severe cases, it can cause geological disasters such as instability of the upper structure of the soil and ground collapse.

[0003] When local differential settlement occurs and foundation treatment is required, the settlement and deformation relationship between the treated site and the surrounding site must be considered. The original site will gradually settle as the site is used. The soil after foundation treatment should deform in coordination with the original site to always keep the site surface flat and the slope uniform.

[0004] Although foundation treatment technology has been continuously developed and various treatment methods have emerged, none of them can accurately control the post-construction settlement of the treated foundation or meet the requirements for coordinated deformation with the surrounding foundation. The problem of repairing local settlement after large-area foundation treatment still needs to be further solved. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a settlement buffer device for a highly compressible foundation and its application. Based on a rigid pile composite foundation, the rigid pile material is improved to give the pile a certain compressibility, thereby achieving coordinated deformation between the improved foundation and the surrounding original foundation and precise control of settlement after foundation treatment, thus achieving flat ground and uniform slope changes in the site area.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] One aspect of the present invention is to provide a settlement buffer device for a highly compressible foundation, comprising a spring telescopic structure; the spring telescopic structure includes a rigid upper support, a rubber sleeve, a spring, a limiting groove, a steel sleeve, and a rigid lower base; the rigid upper support and the rigid lower base are both horizontal and arranged vertically; the spring is vertical, and its upper and lower ends are respectively connected to the rigid upper support and the rigid lower base; the limiting groove is fixed inside the steel sleeve; the steel sleeve is sleeved outside the spring, and its upper and lower ends are respectively fixedly connected to the rigid upper support and the rigid lower base; the rubber sleeve is sleeved outside the rigid upper support and the steel sleeve, and its upper end is fixed to the top of the rigid upper support, and its lower end is fixed to the outside of the steel sleeve.

[0008] Preferably, the length l0 of the spring is between 0.5m and 1.5m.

[0009] Preferably, the limiting groove is installed at a position where the spring can achieve the maximum settlement.

[0010] Preferably, the rigid upper support, the steel sleeve, the rigid lower base, and the rubber sleeve together constitute a sealed environment suitable for the extension and retraction of the spring.

[0011] Preferably, the top of the rigid upper support is further provided with a groove; a lifting ring is fixed in the groove to suspend the spring telescopic structure.

[0012] Preferably, the top of the rigid upper support is further provided with a groove; the settlement buffer device also includes a rigid semi-rigid pile disposed in the groove, and a connecting structure for connecting the rigid semi-rigid pile and the spring telescopic structure; the connecting structure enables the rigid semi-rigid pile and the spring telescopic structure to be tightly connected, thereby forming a spring concrete composite pile with a complete pile body and uniform stress.

[0013] Preferably, the spring concrete composite piles are arranged in n rows; the value of n is between 2 and 5.

[0014] Preferably, the pile diameter d of the spring concrete composite pile is between 0.2 and 1.2 m, and the pile spacing D is 3 to 6 times the pile diameter d.

[0015] Preferably, it further includes rigid piles; the spring concrete composite piles are arranged around the rigid piles between the rigid piles and the undisturbed soil foundation.

[0016] Another aspect of the present invention is to provide an application of the aforementioned settlement buffer device in a highly compressible foundation.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects:

[0018] For example, based on the rigid pile composite foundation, this invention improves the rigid pile material to give the pile a certain compressibility, thereby achieving coordinated deformation between the improved foundation and the surrounding original foundation, as well as precise control of settlement after foundation treatment. This results in a level ground surface and uniform slope changes in the site, making it particularly suitable for use in the transition section of foundation treatment in sites where the foundation itself has settlement deformation, such as the treatment of local ground collapse in large areas of soft soil foundations. This provides a new foundation treatment technology and method in the field of foundation engineering. Attached Figure Description

[0019] Figure 1 This is a cross-sectional schematic diagram of the settlement buffer device in an embodiment of the present invention applied to a highly compressible foundation;

[0020] Figure 2 This is a plan view of the settlement buffer device in an embodiment of the present invention applied to a highly compressible foundation;

[0021] Figure 3 This is a cross-sectional schematic diagram of the spring concrete composite pile in its natural state according to an embodiment of the present invention.

[0022] Figure 4 This is a cross-sectional schematic diagram of the spring concrete composite pile in the embodiment of the present invention under the ultimate state.

[0023] Figure 5 This is a schematic diagram of the monitoring and early warning unit of the settlement buffer device in an embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the monitoring and early warning process of the settlement buffer device in an embodiment of the present invention.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Original soil foundation; 2. New type of composite pile foundation; 3. Rigid pile foundation; 4. Poor soil; 5. Building foundation; 6. Cushion layer; 7. Steel mesh; 8. Monitoring and early warning unit.

[0027] 2-1 Spring concrete composite pile, 2-1-1 Rigid upper support, 2-1-2 Rubber sleeve, 2-1-3 Spring, 2-1-4 Limiting groove, 2-1-5 Steel sleeve, 2-1-6 Rigid lower base, 2-1-7 Lifting ring, 2-1-8 Connection structure, 2-1-9 Rigid-semi-rigid pile;

[0028] 3-1 Rigid piles;

[0029] 8-1 Data acquisition module, 8-1-1 Pressure sensor, 8-1-2 Local transmission device;

[0030] 8-2 Monitoring and Early Warning Module, 8-2-1 Monitoring and Early Warning Database, 8-2-2 Monitoring and Early Warning Algorithm Submodule, 8-2-3 Monitoring and Early Warning Analysis Submodule;

[0031] 8-3 User Terminal. Detailed Implementation

[0032] Typically, soil settlement in composite foundations leads to pile compression, causing further foundation settlement. The settlement of composite foundations is significantly less than that of untreated soil foundations. The technical solution provided by this invention combines upper rigid-semi-rigid piles with a lower spring-loaded telescopic structure, resulting in a composite foundation with a certain amount of settlement. This greatly improves the deformation coordination between the treated foundation area and the surrounding area, enhances the surface flatness of the site, and reduces uneven settlement. It also innovates in pile form, function, and stress characteristics, particularly highlighting the coordinated effect between the pile and the soil between them.

[0033] To make the objectives, features, and beneficial effects of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described below are merely for explaining the present invention and are not intended to limit the present invention. Furthermore, the same or similar reference numerals may be used in the drawings to refer to the same or similar elements in different embodiments, and descriptions of the same or similar elements in different embodiments, as well as descriptions of prior art elements, features, effects, etc., may be omitted.

[0034] This invention provides a settlement buffer device for highly compressible foundations and its application. Furthermore, when applied to highly compressible foundations, this settlement buffer device can form a spring-concrete composite pile foundation.

[0035] Typically, highly compressible foundations are unfavorable for engineering construction, thus requiring foundation treatment. The settlement buffer device provided in this invention is a new technology for foundation treatment, relying on the interaction between the piles and the soil. Highly compressible foundations treated with this settlement buffer device exhibit a uniform transition in settlement deformation between the treated and untreated areas.

[0036] In this invention, there are no requirements for the physical and mechanical properties of the soil foundation. The existing soil foundation can be used, or sand, gravel, etc. can be used as the soil foundation.

[0037] Reference Figure 1 and Figure 2 The spring concrete composite pile foundation includes an original soil foundation 1, a new composite pile foundation 2, and a rigid pile composite foundation 3, and its top is suitable for arranging the foundation of buildings 5.

[0038] In some embodiments, both the novel composite pile foundation 2 and the rigid pile composite foundation 3 are disposed within the undisturbed soil foundation 1, and the novel composite pile foundation 2 is disposed around the rigid pile composite foundation 3 between the rigid pile composite foundation 3 and the undisturbed soil foundation 1 to serve as a transition.

[0039] In practice, the original soil foundation 1, the new composite pile foundation 2, and the rigid pile foundation 3 all contain undesirable soil 4, and a cushion layer 6 is set on top of the new composite pile foundation 2 and the rigid pile foundation 3. At the same time, the top of the new composite pile foundation 2 and the rigid pile foundation 3 is covered with a steel mesh 7.

[0040] In specific implementation, the rigid pile composite foundation 3 includes rigid piles 3-1 and undisturbed soil filling the spaces between the rigid piles 3-1, and the undisturbed soil contains undesirable soil 4.

[0041] In specific implementation, the new composite pile foundation 2 includes spring concrete composite piles 2-1 and undisturbed soil filling the spaces between the spring concrete composite piles 2-1, and the undisturbed soil contains undesirable soil 4.

[0042] Reference Figure 3 and Figure 4 The spring concrete composite pile 2-1 includes rigid-semi-rigid piles 2-1-9 arranged vertically and spring expansion structures, as well as a connecting structure 2-1-8 for connecting the rigid-semi-rigid piles 2-1-9 and the spring expansion structures.

[0043] Rigid-semi-rigid piles 2-1-9 include, but are not limited to, piles manufactured using currently mature pile-forming techniques. Examples include: cast-in-place concrete piles, high-pressure jet grouting core piles, grout-bonded crushed stone piles, prestressed reinforced concrete precast piles, CFG piles, etc. Furthermore, the pile material is not limited to concrete; cast-in-place concrete piles are used here as a representative example.

[0044] The elastic telescopic structure includes a rigid upper support 2-1-1, a rubber sleeve 2-1-2, a spring 2-1-3, a limiting groove 2-1-4, a steel sleeve 2-1-5, a rigid lower base 2-1-6, and a lifting ring 2-1-7.

[0045] Furthermore, the top of the rigid upper support 2-1-1 is provided with a groove to facilitate connection with the upper cast-in-place concrete pile and fixation of the rubber sleeve 2-1-2. In addition, a lifting ring 2-1-7 is welded into the groove for hoisting the spring telescopic structure, which can be connected to the lifting ring 2-1-7 welded into the groove by a crane.

[0046] In practice, spring 2-1-3 is firmly welded to the bottom of rigid upper support 2-1-1, limiting groove 2-1-4 is welded inside steel sleeve 2-1-5, steel sleeve 2-1-5 is fitted over rigid upper support 2-1-1, and the bottom of spring 2-1-3 is firmly welded to rigid lower base 2-1-6; spring 2-1-3 is kept vertical, and rigid lower base 2-1-6 is kept horizontal with rigid upper support 2-1-1; steel sleeve 2-1-5 is then welded to the bottom of rigid lower base 2-1-6. The base 2-1-6 is welded firmly; one end of the rubber sleeve 2-1-2 with a certain degree of elasticity is fixed to the outer wall of the steel sleeve 2-1-5, and the other end is fixed to the outer wall of the groove at the top of the rigid upper support 2-1-1. Polyurethane glue, acrylic glue, silicone, cyano glue, etc. can be used for bonding; a seal is required during installation. The rigid upper support 2-1-1, rubber sleeve 2-1-2, steel sleeve 2-1-5, and rigid lower base 2-1-6 together form an elastic and sealed environment.

[0047] In practice, the limiting groove 2-1-4 is used to control the maximum compression of the spring concrete composite pile 2-1, and plays a substitute role in controlling settlement when the spring 2-1-3 fails.

[0048] Specifically, the limiting groove 2-1-4 mainly serves a supporting function. When the spring 2-1-3 reaches its maximum compression, continued compression will lead to instability. To ensure the overall stability of the spring-concrete composite pile 2-1, this invention sets the limiting groove 2-1-4 at the position of the maximum settlement achievable within the elastic compression range of the spring 2-1-3. During the compression process of the spring-concrete composite pile 2-1, when the rigid upper support 2-1-1 contacts the limiting groove 2-1-4, the spring 2-1-3 no longer functions, and at this time, the spring-concrete composite pile 2-1 is equivalent to a rigid pile.

[0049] The main function of the connecting structure 2-1-8 is to tightly connect the upper rigid-semi-rigid pile 2-1-9 with the lower spring expansion joint structure, thereby forming a complete and uniformly stressed composite pile body. The specific structural form of the connecting structure 2-1-8 includes, but is not limited to, ribbed steel bars of a certain length welded to the top of the rigid upper support 2-1-1. After concrete is poured on the upper part of the rigid upper support 2-1-1, the ribbed steel bars connect the cast-in-place concrete with the spring expansion joint structure.

[0050] In this embodiment of the invention, the upper rigid-semi-rigid pile 2-1-9 has high stiffness and strength, and minimal deformation after construction. When combined with the spring telescopic structure, it can give the composite foundation a certain degree of compressibility.

[0051] In this embodiment of the invention, the novel composite pile foundation 2 is formed by the combined action of the untreated soil 4 and the spring concrete composite piles 2-1 to form a reinforced body. The pile diameter, pile length and pile spacing of the composite piles can be designed according to the foundation bearing capacity requirements and site engineering geological conditions. Holes are formed by impact drilling and other methods, and spring concrete composite piles 2-1 are laid in the holes. After the piles are formed, they are compacted and reinforced with steel mesh 7 and cushion layer 6 to form a composite foundation.

[0052] In practical implementation, the rigid pile composite foundation 3 bears the load transmitted by the superstructure through the rigid piles 3-1 and the soil between the piles. This causes the soil between the piles to be compacted and the side friction of the rigid piles 3-1 to increase, thereby significantly reducing the settlement of the composite foundation under load.

[0053] In this invention, the settlement of the novel composite pile foundation 2 under load is between that of the original soil foundation 1 and the rigid pile composite foundation 3, and its arrangement between the two plays a transitional role.

[0054] In practical implementation, n rows of spring concrete composite piles 2-1 can be arranged in the new composite pile foundation 2.

[0055] In some embodiments, n takes values ​​between 2 and 5, including 2, 3, 4, and 5, because too few rows cannot effectively play a role in settlement transition, while too many rows will increase the project investment.

[0056] In some embodiments, for the spring concrete composite pile 2-1 in the novel composite pile foundation 2 and the rigid pile 3-1 in the rigid pile composite foundation 3, the pile diameter d can be between 0.2 and 1.2 m, including 0.2 m and 1.2 m, and the pile spacing D can be 3 to 6 times the pile diameter d, including 3 times and 6 times.

[0057] The steel mesh 7 covers the top of the pile body and soil of the entire new composite pile foundation 2, and is inserted into the original soil foundation 1 and the rigid pile composite foundation 3 to play the role of force transmission, so that the new composite pile foundation 2 can deform in coordination with the original soil foundation 1 and the rigid pile composite foundation 3.

[0058] The undesirable soil 4 in the original soil needs to be compacted to meet the compaction requirements and have uniform physical and mechanical properties before the spring concrete composite pile foundation can be used as a building foundation.

[0059] Due to limitations in surface compaction technology, the foundation may be in an under-consolidated state, resulting in uniform settlement over time. In this invention, the final surface settlement *s* of the site can be predicted based on settlement monitoring data over a certain period, or the final surface settlement *s* can be estimated using the layered summation method in existing technologies based on the soil's mechanical properties.

[0060] In this embodiment of the invention, the maximum settlement of the spring concrete composite pile 2-1 should be able to reach the maximum uniform settlement s that the undisturbed soil foundation 1 can produce. Furthermore, the settlement of the spring concrete composite pile 2-1 mainly comes from the compression of the spring 2-1-3 at the bottom of the pile body.

[0061] In some embodiments, the length l0 of the spring telescopic structure, i.e. the length of spring 2-1-3, should be between 0.5 and 1.5 m, including 0.5 m and 1.5 m; provided that the settlement requirement is met, spring 2-1-3 with a length l0 of 0.5 m is preferred.

[0062] Furthermore, the limiting groove 2-1-4 is installed at the position where the spring 2-1-3 can achieve the maximum settlement.

[0063] In this embodiment of the invention, the spring constant k of spring 2-1-3 is calculated according to the following formula:

[0064] k = p k A p / s

[0065] In the formula:

[0066] k — spring constant;

[0067] p k —The average pressure (kPa) acting on the top of the settlement buffer device on a highly compressible foundation;

[0068] A p — Cross-sectional area of ​​a single pile (m²) 2 );

[0069] s——The maximum uniform settlement (m) that the original soil foundation 1 can produce.

[0070] By adopting the above technical solution, the spring concrete composite pile foundation provided in this embodiment of the invention can achieve a smooth foundation surface, so that the settlement transition between the original soil foundation 1 and the rigid pile composite foundation 3 is uniform, thereby avoiding situations where the normal use is affected or disasters such as ground subsidence occur due to excessive local height differences.

[0071] Under the action of surface load, the undisturbed soil foundation 1, the novel composite pile foundation 2, and the rigid pile composite foundation 3 all experienced settlement. Due to its small compression modulus, the undisturbed soil foundation 1 experienced a larger settlement, which in turn caused the top steel mesh 7 to settle. The steel mesh 7 then transferred the force to the top of the novel composite pile foundation 2. Under the combined action of the surface load and the load transferred by the steel mesh 7, the spring-loaded structure of the novel composite pile foundation 2 was compressed, and the amount of compression dynamically changed with the settlement of the undisturbed soil foundation 1 and the rigid pile composite foundation 3.

[0072] In this embodiment of the invention, the settling buffer device may include the aforementioned elastic telescopic structure.

[0073] Furthermore, the settlement buffer device also includes a rigid-semi-rigid pile 2-1-9 arranged above the elastic telescopic structure, and a connecting structure 2-1-8 for connecting the rigid-semi-rigid pile 2-1-9 and the spring telescopic structure.

[0074] Furthermore, the settlement buffer device also includes rigid piles 3-1, and spring concrete composite piles 2-1, which are composed of elastic telescopic structures and rigid-semi-rigid piles 2-1-9 above them, are arranged around rigid piles 3-1 between rigid piles 3-1 and undisturbed soil foundation 1 to serve as a transition.

[0075] In some embodiments, the settlement buffer device further includes a monitoring and early warning unit 8.

[0076] Reference Figure 5 The monitoring and early warning unit 8 may include a data acquisition module 8-1, a monitoring and early warning module 8-2, and a user terminal 8-3 that are connected in sequence via communication.

[0077] In some embodiments, the data acquisition module 8-1 and the monitoring and early warning module 8-2, as well as the monitoring and early warning module 8-2 and the user terminal 8-3, can be connected via 4G or 5G communication.

[0078] In specific implementation, the data acquisition module 8-1 is adapted to acquire pressure data of the spring concrete composite pile 2-1 and transmit the acquired pressure data to the monitoring and early warning module 8-2. It may include a pressure sensor 8-1-1 and a local transmission device 8-1-2 connected to each other. The pressure sensor 8-1-1 can be fixed to the top of the limiting groove 2-1-4 and is used to monitor the pressure data of the spring concrete composite pile 2-1; the local transmission device 8-1-2, such as a wireless monitoring terminal or a wireless transmitter, is adapted to transmit the pressure data acquired by the pressure sensor 8-1-1 to the monitoring and early warning module 8-2.

[0079] The monitoring and early warning module 8-2 is a cloud server, which may include interconnected monitoring and early warning database 8-2-1, monitoring and early warning algorithm submodule 8-2-2, and monitoring and early warning analysis submodule 8-2-3. The monitoring and early warning database 8-2-1 stores data, including user configuration data, the device number of pressure sensor 8-1-1, pressure data collected by data acquisition module 8-1, and the three-dimensional coordinate data of the spatial location of pressure sensor 8-1-1 and the interpolated data of spatial point pressure values ​​processed by monitoring and early warning algorithm submodule 8-2-2. The monitoring and early warning algorithm submodule 8-2-2 is used to establish the correspondence between the device number of pressure sensor 8-1-1 and the three-dimensional coordinate data of the spatial location of pressure sensor 8-1-1, that is, to establish a one-to-one correspondence between the device number of pressure sensor 8-1-1 and the spring concrete composite pile 2-1 where pressure sensor 8-1-1 is located, so as to realize the cloud positioning of pressure sensor 8-1-1, and to form surface data based on spatial point pressure data through interpolation. The monitoring and early warning analysis submodule 8-2-3 is used to configure user data, form a pressure distribution cloud map of spring concrete composite pile 2-1 in the site area based on spatial point pressure surface data (this is the prior art), and output the pressure distribution cloud map.

[0080] The monitoring and early warning module 8-2 is also suitable for transmitting data, including pressure distribution cloud map data and operating system interface data, to the user terminal 8-3 so as to enable real-time monitoring at the user terminal 8-3.

[0081] Reference Figure 1 The pressure sensor 8-1-1 in the data acquisition module 8-1 can be arranged on the top of the limiting groove 2-1-4 of each spring concrete composite pile 2-1 to monitor the pressure data of each spring concrete composite pile 2-1. When the pressure data detected by the pressure sensor 8-1-1 is greater than 0, it indicates that the spring concrete composite pile 2-1 where the pressure sensor 8-1-1 is located has failed.

[0082] Reference Figure 6 The monitoring and early warning process of the monitoring and early warning unit 8 may include the following steps:

[0083] (1) Preset the device number of each pressure sensor 8-1-1, and store the device number and the three-dimensional coordinate data of the spatial position of the pressure sensor 8-1-1 in the monitoring and early warning database 8-2-1; collect the pressure data of each spring concrete assembly 2-1 in real time through each pressure sensor 8-1-1, and transmit the collected pressure data to the remote monitoring module 8-2 through the local transmission device 8-1-2. After the pressure data is transmitted to the monitoring and early warning module 8-2, it can be stored in the monitoring and early warning database 8-2-1;

[0084] (2) The monitoring and early warning algorithm submodule 8-2-2 is used to establish the correspondence between the device number of pressure sensor 8-1-1 and the three-dimensional coordinate data of the spatial location of pressure sensor 8-1-1, that is, to establish a one-to-one correspondence between the device number of pressure sensor 8-1-1 and the spring concrete composite pile 2-1 where pressure sensor 8-1-1 is located, so as to realize the cloud positioning of pressure sensor 8-1-1.

[0085] (3) The monitoring and early warning algorithm submodule 8-2-2 determines whether the pressure value collected by the pressure sensor 8-1-1 is greater than 0; if it is greater than 0, the pressure data of the spatial point is interpolated to form surface data and output to the monitoring and early warning analysis submodule 8-2-3; if it is less than 0, the “0” signal is output to the monitoring and early warning analysis submodule 8-2-3.

[0086] (4) Output a “0” signal through the monitoring and early warning analysis submodule 8-2-3 or generate a pressure distribution cloud map of spring concrete composite pile 2-1 in the site area based on the surface data;

[0087] (5) Output the “0” signal or the pressure distribution cloud map of spring concrete composite pile 2-1 in the field area to the user terminal 8-3.

[0088] In some embodiments, a user interface and a monitoring and early warning interface can also be created in the user terminal 8-3 to facilitate user operation and display of the "0" signal or the pressure distribution cloud map of the spring concrete composite piles 2-1 in the site area, so as to intuitively display the pressure status of the spring concrete composite piles 2-1 in the site area.

[0089] In some embodiments, warning rules can also be set on the user terminal 8-3. For example, the ratio of the area with a pressure value greater than a certain value in the pressure distribution cloud map to the total area of ​​the cloud map can be set, or a warning can be set when the maximum pressure value reaches a certain value, or a graded warning can be set.

[0090] This invention also provides a construction method for a spring-concrete composite pile foundation, comprising the following steps:

[0091] (1) The entire site area is leveled and compacted to reduce the post-construction settlement of the original soil foundation 1 to a certain extent and facilitate subsequent construction. The site area is divided into zones and boundaries are defined. The site area is divided into the original soil foundation zone, the new composite pile foundation zone and the rigid pile composite foundation zone.

[0092] (2) Position and mark the rigid pile 3-1 and spring concrete composite pile 2-1 according to the pile spacing requirements, and make white lime marks to facilitate subsequent drilling construction.

[0093] (3) Based on the ground settlement monitoring data around the construction site, predict the final settlement of the site surface. Combine the ground load of the site area to select a spring with appropriate length and elastic coefficient. The settlement of the newly built composite foundation will mainly come from the compression deformation of the spring. The maximum deformation of the spring concrete composite pile 2-1 should be similar to the final settlement of the surrounding ground surface.

[0094] (4) Fabrication of prefabricated spring telescopic structure components: Weld ribbed steel bars to the top of the rigid upper support 2-1-1 as a connecting structure; weld a lifting ring 2-1-7 to the center of the top of the rigid upper support 2-1-1; weld the spring 2-1-3 firmly to the bottom of the rigid upper support 2-1-1; weld the limiting groove 2-1-4 inside the steel sleeve 2-1-5; fit the steel sleeve 2-1-5 onto the outside of the rigid upper support 2-1-1; then weld the bottom of the spring 2-1-3 firmly to the rigid lower base 2-1-6, ensuring that the spring 2-1-3 is placed vertically and that the rigid lower base 2-1-6 and the rigid upper support 2-1-1 remain horizontal; install a pressure sensor 8-1-1 on the top of the limiting groove 2-1-4; and connect the local transmission device... The 8-1-2 is installed on the ground to receive pressure data collected by the pressure sensor 8-1-1 and wirelessly transmit the collected pressure data to the remote monitoring module 8-2. The steel sleeve 2-1-5 is welded firmly to the rigid lower base 2-1-6. One end of the rubber sleeve 2-1-2 with a certain degree of elasticity is fixed to the outer wall of the steel sleeve 2-1-5, and the other end is fixed to the outer wall of the groove at the top of the rigid upper support 2-1-1. The installation requires a seal. The rigid upper support 2-1-1, rubber sleeve 2-1-2, steel sleeve 2-1-5, and rigid base 2-1-6 together form a retractable and sealed environment. At this time, the prefabricated spring telescopic structure is completed, and prefabricated components can be mass-produced according to design requirements.

[0095] (5) Determine the drilling location, radius, depth and other parameters according to the design plan. Based on the pile positioning, use a long spiral drilling rig to drill holes to the bottom of the foundation. During the drilling process, the verticality and depth of the drilling should be controlled. The order of pile formation is: symmetrical, spaced, and adjacent rows of oblique driving.

[0096] (6) Concrete is poured into the boreholes in the rigid pile composite foundation area to the ground surface to form rigid piles 3-1;

[0097] (7) In the borehole in the composite foundation area of ​​spring concrete composite pile, the spring telescopic structure is suspended to the bottom of the foundation, and concrete or other rigid-semi-rigid materials are poured into the borehole to the ground surface to form spring concrete composite pile 2-1;

[0098] (8) After the concrete pile body has a certain strength, first compact the surface of the soil between the piles to reinforce the foundation, and then lay steel mesh 7 on the top of the soil surface in the spring concrete composite pile composite foundation area. The laying range of steel mesh 7 is expanded to both sides by at least 2m, entering the original soil foundation area and the rigid pile composite foundation area.

[0099] (9) After laying the subbase 6 in the site area, the construction of the composite foundation is completed.

[0100] After the construction is completed, the composite foundation can be used as the foundation of the building, that is, the foundation structure, namely the foundation of the building, can be arranged on the top of the cushion layer 6.

[0101] It should be noted that, in the embodiments of the present invention, the order of the above steps is not limited.

[0102] Although specific embodiments have been described above, these embodiments are not intended to limit the scope of the invention, even when only a single embodiment is described with respect to a particular feature. The feature examples provided in this disclosure are intended to be illustrative and not limiting, unless otherwise stated. In practice, one or more technical features of the dependent claims may be combined with the technical features of the independent claims as needed and where technically feasible, and the technical features from the respective independent claims may be combined in any suitable manner rather than solely by the specific combinations listed in the claims.

[0103] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A settlement buffer device for highly compressible foundations, characterized in that, The device includes a spring telescopic structure; the spring telescopic structure includes a rigid upper support (2-1-1), a rubber sleeve (2-1-2), a spring (2-1-3), a limiting groove (2-1-4), a steel sleeve (2-1-5), and a rigid lower base (2-1-6); the rigid upper support (2-1-1) and the rigid lower base (2-1-6) are both horizontal and arranged vertically; the spring (2-1-3) is vertical, and its upper and lower ends are respectively connected to the rigid upper support (2-1-1) and the rigid lower base (2-1-6); the limiting groove (2-1-4) is... 1-4) Fixed inside the steel sleeve (2-1-5); the steel sleeve (2-1-5) is sleeved outside the spring (2-1-3), its upper end is connected to the rigid upper support (2-1-1) through the rubber sleeve (2-1-2), and its lower end is fixedly connected to the rigid lower base (2-1-6); the rubber sleeve (2-1-2) is sleeved outside the rigid upper support (2-1-1) and the steel sleeve (2-1-5), and its upper end is fixed to the top of the rigid upper support (2-1-1), and its lower end is fixed outside the steel sleeve (2-1-5).

2. The settling buffer device according to claim 1, characterized in that, The length of the spring (2-1-3) l 0 is located between 0.5m and 1.5m.

3. The settling buffer device according to claim 1, characterized in that, The limiting groove (2-1-4) is installed at the position where the spring (2-1-3) can achieve the maximum settlement.

4. The settling buffer device according to claim 1, characterized in that, The rigid upper support (2-1-1), the steel sleeve (2-1-5), the rigid lower base (2-1-6), and the rubber sleeve (2-1-2) together form a sealed environment suitable for the extension and retraction of the spring (2-1-3).

5. The settling buffer device according to claim 1, characterized in that, The top of the rigid upper support (2-1-1) is also provided with a groove; a lifting ring (2-1-7) is fixed in the groove to suspend the spring telescopic structure.

6. The settling buffer device according to any one of claims 1 to 5, characterized in that, The top of the rigid upper support (2-1-1) is also provided with a groove; the settlement buffer device also includes a rigid-semi-rigid pile (2-1-9) disposed in the groove, and a connecting structure (2-1-8) for connecting the rigid-semi-rigid pile (2-1-9) and the spring telescopic structure; the connecting structure (2-1-8) tightly connects the rigid-semi-rigid pile (2-1-9) with the spring telescopic structure, thereby forming a spring concrete composite pile (2-1) with a complete pile body and uniform stress.

7. The settling buffer device according to claim 6, characterized in that, The spring concrete composite pile (2-1) is arranged with n Row; n The value ranges from 2 to 5.

8. The settling buffer device according to claim 7, characterized in that, The pile diameter of the spring concrete composite pile (2-1) d Located between 0.2 and 1.2 meters, and with pile spacing D Pile diameter d 3 to 6 times.

9. The settling buffer device according to claim 6, characterized in that, It also includes rigid piles (3-1); the spring concrete composite piles (2-1) are arranged around the rigid piles (3-1) between the rigid piles (3-1) and the original soil foundation (1).

10. The application of the settlement buffer device as described in any one of claims 1 to 9 in highly compressible foundations.

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