A settlement control system suitable for deep soft soil foundations and its application method

Abstract

This invention designs a settlement control system and its application method suitable for deep soft soil foundations. The settlement control system includes a spiral jack, a foundation, and a surface cover plate. The foundation is a strip foundation, and the spiral jack is respectively set at the four corners of the strip foundation. A surface cover plate is set on the spiral jack, and a pad plate is also set between the strip foundation and the surface cover plate. Jack placement holes are reserved at the four corners of the strip foundation. The jack placement holes include an upper auger rotation hole and a lower base placement hole. The diameter of the upper auger rotation hole is larger than the diameter of the lower base placement hole. This application, through the designed settlement control system, transforms the uneven settlement over a large area of ​​the entire site into adjustable uneven settlement of a single foundation, thereby achieving controllable settlement of the entire project and demonstrating good adaptability to deep soft soil foundations.

Description

Technical Field

[0001] This invention belongs to the field of foundation engineering, specifically relating to a settlement control system suitable for deep soft soil foundations and its application method. Background Technology

[0002] With the development of port engineering, the prime near-shore coastlines have been largely developed, forcing new projects to gradually shift towards the more complex natural conditions of the open sea. Open sea areas often face the problem of excessively thick soft soil layers; without foundation treatment, these layers clearly cannot meet the requirements for engineering use. Treating all the soft soil within the construction area is not only technically impossible but also fails to meet cost constraints. Therefore, ensuring the project can continue to operate normally after settlement is a pressing issue that needs to be addressed in offshore construction projects.

[0003] Chinese patent CN217128207U discloses a jet grouting reinforcement, lifting, and leveling structure for settlement-prone soft soil foundations, comprising a backfill base, a non-soft soil layer, a soft soil layer, a hard soil layer, cement-reinforced piles, a concrete base, a floor layer, and a filling layer. The floor layer has lifting holes, and the backfill base has cement-reinforced piles arranged downwards through the non-soft soil layer and the soft soil layer at the corresponding positions of the lifting holes. The bottom of the cement-reinforced piles is located within the hard soil layer. The cement-reinforced piles are single-section or variable-section columnar structures, with a concrete base positioned above them. A filling layer is arranged in the cavity between the floor layer and the backfill base, but once settlement occurs, it is irreversible, making it impossible to stabilize the upper structure.

[0004] Chinese patent CN105133851B discloses a method and structure for lifting, leveling, and repairing a ground surface on a soft soil foundation. The method includes a ground surface with multiple lifting holes, a concrete base, multiple anchor rods embedded in the ground surface around each lifting hole, a lifting reaction frame, jacks for supporting the lifting reaction frame, and reinforcing piles. The lifting reaction frame is fixedly connected to the anchor rods around each lifting hole. Below the ground surface is a soft soil base layer, and below that is a hard soil layer. The reinforcing piles are drilled into the soft soil base layer under each lifting hole and extend into the hard soil layer. A concrete base is placed on top of each reinforcing pile, and the jacks are supported on the top of each concrete base and abut against the bottom of the lifting reaction frame. This method has the advantages of good repair effect, convenient construction, and applicability to soft soil foundations. However, its reinforcement technology is not ideal for soft soil exceeding 30m in depth and is expensive, while deep soft soil foundations exceeding 30m are frequently encountered in offshore areas.

[0005] The thickness of the soft soil in the natural foundation is H1 where it is relatively thin and H2 where it is thicker. The settlement of the soft soil at depth H1 during construction is denoted as S1. 施工 The residual settlement during the service period is denoted as S1. 残余The total settlement of the soft soil at depth H1 is denoted as S1, where S1 = S1 施工 +S1 残余 S1 施工 S1 残余 All of these can be calculated using existing mature calculation theories, such as the layered summation method. Similarly, the total settlement of thickness H2, S2 = S2 施工 +S2 残余 The traditional method of using S1=S2 as the control standard results in excessively high foundation treatment costs. Therefore, it is particularly important to design an adjustable foundation that can transform the uneven settlement of a large area of ​​the site into the uneven settlement of a single foundation, and to control the settlement that occurs during use, thereby achieving controllable settlement of the entire project. Summary of the Invention

[0006] To address the aforementioned issues, a scientific settlement control standard is needed that meets the structural requirements while offering a reinforcement plan that is both economical and practically feasible. Furthermore, structural adjustments can be made after settlement occurs to ensure the normal operation of the project.

[0007] To achieve the above effects, this invention designs a settlement control system suitable for deep soft soil foundations and its usage method.

[0008] A settlement control system suitable for deep soft soil foundations includes a screw jack, a foundation, and a surface cover plate.

[0009] The foundation is a strip foundation;

[0010] The spiral jacks are respectively installed at the four corners of the strip foundation;

[0011] The spiral jack is equipped with a surface cover plate;

[0012] A pad is also provided between the strip foundation and the surface cover plate.

[0013] Preferably, jack mounting holes are reserved at the four corners of the strip foundation, and the jack mounting holes include an upper auger rotation hole and a lower base placement hole; the diameter of the upper auger rotation hole is larger than the diameter of the lower base placement hole.

[0014] Preferably, the upper auger rotation hole and the lower base placement hole are concentric.

[0015] Preferably, a pad is provided between the bottom of the upper auger rotation hole and the auger of the screw jack to support the stability of the screw jack.

[0016] Preferably, the pad includes, but is not limited to, steel pads and rubber pads.

[0017] A method for using a settlement control system suitable for deep soft soil foundations includes the following steps:

[0018] Step S1: Set up strip foundations on the natural foundation according to the settlement requirements to form horizontal strip foundations;

[0019] Step S2: Create jack placement holes at the four corners of the strip foundation by pre-drilling holes;

[0020] Step S3: Place the screw jack at the jack mounting hole;

[0021] Step S4: Place pads at the installation holes and diagonal points of the strip foundation;

[0022] Step S5: Place the top cover plate on the pad and the screw jack.

[0023] Preferably, the method further includes step S6, wherein when the completed strip foundation settles during use, the jacking of the spiral jack is adjusted to make a certain corner of the sunken strip foundation reach the horizontal support height.

[0024] Preferably, the lifting height of the spiral jack is required to ensure that the settlement height of the structure is equal during its service life under different soil conditions.

[0025] Preferably, in the step of placing pads at the diagonal of the foundation, the height of the pads stacked is the same as the lifting height of the screw jack.

[0026] The advantages and effects of this application are as follows:

[0027] 1. This application, through scientific calculations in the early stage and structural adjustment in the later stage, transforms the uneven settlement of the entire site over a large area into the adjustable uneven settlement of a single foundation, thereby achieving controllable settlement of the entire project and demonstrating good adaptability to deep soft soil foundations.

[0028] 2. This application proposes a standard for foundation treatment, and back-calculates the thickness H2 of the soft soil that needs to be treated. * The foundation treatment range H2 proposed in this invention * The goal is not to completely eliminate settlement S2, but rather to address settlement S1. 残余 =S2 残余 As a control measure, it is not necessary to reinforce the entire soft soil layer, but rather to reduce uneven settlement while meeting the usage conditions.

[0029] 3. This application uses spiral jacks installed at the four corners of the strip foundation to transfer the uneven settlement of the entire site to a specific strip foundation itself, or even a specific corner of the strip foundation. By adjusting the strip foundation locally, the uneven settlement is eliminated, thereby reducing the impact on the entire project.

[0030] 4. This application provides support for the upper structure by setting jack mounting holes on the strip foundation and lifting the top cover plate of the jack through the lifting action of the jack. Furthermore, by setting pads between the strip foundation and the cover plate, and by setting pads at the bottom of the upper auger rotation hole and between the auger of the screw jack, the stability of the screw jack and the horizontal stability of the cover plate are supported.

[0031] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the preferred embodiments of this application are described in detail below with reference to the accompanying drawings.

[0032] The above and other objects, advantages and features of this application will become more apparent to those skilled in the art from the following detailed description of specific embodiments in conjunction with the accompanying drawings. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0034] Figure 1 Design drawings for a settlement control system suitable for deep soft soil foundations provided in this application;

[0035] Figure 2 A front view of a settlement control system suitable for deep soft soil foundations provided in this application;

[0036] Figure 3 A top view of a settlement control system suitable for deep soft soil foundations provided in this application;

[0037] Attached reference numerals: 1. Screw jack; 2. Strip foundation; 3. Surface cover plate; 4. Pad plate; 5. Upper winch rotation hole; 6. Lower base placement hole; 7. Winch. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. In the following description, specific details such as specific configurations and components are provided merely to help fully understand the embodiments of this application. Therefore, those skilled in the art should understand that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this application. In addition, for clarity and brevity, descriptions of known functions and structures are omitted in the embodiments.

[0039] It should be understood that the phrase "an embodiment" or "this embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this application. Therefore, "an embodiment" or "this embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0040] Furthermore, reference numerals and / or letters may be repeated in different examples within this application. Such repetition is for the purpose of simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or settings discussed.

[0041] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist simultaneously. The term " / and" in this article describes another type of relationship between related objects, indicating that two relationships can exist. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the related objects before and after it are in an "or" relationship.

[0042] In this article, the term "at least one" is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, "at least one of A and B" can mean: A exists alone, A and B exist simultaneously, or B exists alone.

[0043] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion.

[0044] Example 1

[0045] This embodiment mainly introduces a settlement control system suitable for deep soft soil foundations. Please refer to the following for details. Figure 1 , Figure 1 This is a design drawing for a settlement control system suitable for deep soft soil foundations.

[0046] A settlement control system suitable for deep soft soil foundations includes a screw jack 1, a foundation, and a surface cover 3;

[0047] The foundation is a strip foundation 2;

[0048] The spiral jacks 1 are respectively installed at the four corners of the strip foundation 2;

[0049] The spiral jack 1 is equipped with a surface cover plate 3; please refer to the details. Figure 3 , Figure 3 A top view of a settlement control system suitable for deep soft soil foundations provided in this application.

[0050] A pad 4 is also provided between the strip foundation 2 and the surface cover plate 3; please refer to the details. Figure 2 , Figure 2 A front view of a settlement control system suitable for deep soft soil foundations provided in this application.

[0051] Furthermore, jack mounting holes are reserved at the four corners of the strip foundation 2. The jack mounting holes include an upper auger rotation hole 5 and a lower base placement hole 6. The diameter of the upper auger rotation hole 5 is larger than the diameter of the lower base placement hole 6.

[0052] Furthermore, the jack cover plate is poured together with the foundation, and holes are reserved for the winch rods, which are then inserted during later adjustments.

[0053] Furthermore, the upper auger rotation hole 5 and the lower base placement hole 6 are concentric.

[0054] Furthermore, a pad 4 is provided between the bottom of the upper jack rotation hole 5 and the jack 7 of the screw jack 1 to support the stability of the screw jack 1.

[0055] Furthermore, the pad 4 includes, but is not limited to, steel pads, rubber pads, and plastic pads.

[0056] This application achieves jack replacement by setting jack mounting holes on the strip foundation, and lifts the top cover plate of the jack through the lifting action of the jack, thereby supporting the upper mounting structure. Furthermore, by setting a pad between the strip foundation and the cover plate, and by setting a pad at the bottom of the upper auger rotation hole and between the auger of the screw jack, the stability of the screw jack and the horizontal stability of the cover plate are supported.

[0057] Example 2

[0058] Based on the above embodiment 1, this embodiment mainly introduces a method for using a settlement control system suitable for deep soft soil foundations.

[0059] A method for using a settlement control system suitable for deep soft soil foundations includes the following steps:

[0060] Step S1: Set up strip foundations 2 on the natural foundation according to the settlement requirements to form horizontal strip foundations 2;

[0061] Step S2: Create jack placement holes at the four corners of the strip foundation 2 by pre-drilling holes;

[0062] Step S3: Place the screw jack 1 at the jack mounting hole;

[0063] Step S4: Place pad 4 at the installation hole and at the diagonal of the strip foundation 2;

[0064] Step S5: Place the surface cover plate 3 on the pad plate 4 and the screw jack 1.

[0065] Furthermore, it also includes step S6, which is to adjust the lifting of the spiral jack 1 when the completed strip foundation 2 settles during use, so that a certain corner of the strip foundation that has sunk is leveled to the support height.

[0066] Furthermore, the lifting height of the spiral jack 1 is required to ensure that the settlement height of the structure is equal during its service life under different soil conditions.

[0067] Furthermore, in step S4, when placing pads 4 at the diagonal of the foundation, the height of the pads 4 is the same as the lifting height of the screw jack 1.

[0068] This application uses spiral jacks installed at the four corners of the strip foundation to transfer the uneven settlement of the entire site to a specific strip foundation itself, or even a specific corner of the strip foundation. By adjusting the strip foundation locally, the uneven settlement is eliminated, thereby reducing the impact on the entire project.

[0069] Example 3

[0070] Based on the above embodiments 1-2, this embodiment mainly introduces the working principle of a settlement control system suitable for deep soft soil foundations.

[0071] The thickness of the soft soil at the relatively thinner section of the natural foundation is H1, and the thickness at the thicker section is H2. The settlement of the soft soil at depth H1 during construction is denoted as S1. 施工 The residual settlement during the service period is denoted as S1.残余 The total settlement of the soft soil at depth H1 is denoted as S1, where S1 = S1 施工 +S1 残余 S1 施工 S1 残余 All of these can be calculated using existing mature calculation theories, such as the layered summation method. Similarly, the total settlement of thickness H2, S2 = S2 施工 +S2 残余 Using S1=S2 as the traditional control standard results in excessively high foundation treatment costs.

[0072] This application, through preliminary scientific calculations and subsequent structural adjustability, transforms the uneven settlement over a large area of ​​the site into adjustable uneven settlement of individual foundations. This application proposes this as a standard for foundation treatment, namely, calculating the required thickness H2 of soft soil to be treated as needed. * This means that by adjusting the lifting height of a single jack or by adjusting the height of all jacks, the settlement of the entire project can be controlled, and it has good adaptability to deep soft soil foundations.

[0073] The foundation treatment range H2 proposed in this invention * The goal is not to completely eliminate settlement S2, but rather to address settlement S1. 残余 =S2 残余 As a control measure, it is not necessary to reinforce the entire soft soil layer; the aim is to reduce uneven settlement.

[0074] The above description is merely a preferred embodiment of the present invention and does not limit the scope of protection of the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any changes, modifications, substitutions, integrations, and parameter alterations to these embodiments within the spirit and principles of the present invention, achieved through conventional substitutions or by achieving the same function without departing from the principles and spirit of the present invention, fall within the scope of protection of the present invention.

Claims

1. A method for using a settlement control system suitable for deep soft soil foundation, characterized in that, the settlement control system suitable for deep soft soil foundation comprises a screw jack, a foundation, and a surface cover plate; the foundation is a strip foundation, which is arranged in the soft soil layer of the natural foundation; the screw jack is arranged at each corner of the strip foundation; the screw jack is provided with a surface cover plate; a cushion plate is further arranged between the strip foundation and the surface cover plate; the strip foundation converts uneven settlement to a specific strip foundation or a specific corner of the strip foundation; a jack setting hole is reserved at each corner of the strip foundation, which comprises an upper rod rotating hole and a lower base placing hole; the diameter of the upper rod rotating hole is larger than that of the lower base placing hole; the upper rod rotating hole and the lower base placing hole have the same center; a cushion plate is further arranged between the bottom of the upper rod rotating hole and the rod of the screw jack for supporting the screw jack; the upper rod rotating hole can be inserted into the rod; the cushion plate comprises a steel cushion plate and a rubber cushion plate; the method for using the settlement control system suitable for deep soft soil foundation comprises the following steps: step S1, arranging a strip foundation on the natural foundation according to the settlement requirement to form a horizontal strip foundation; step S2, forming a jack setting hole by reserving a hole at each corner of the strip foundation; step S3, placing a screw jack at the jack setting hole; step S4, placing a cushion plate at the diagonal line of the strip foundation and the setting hole; step S5, placing a surface cover plate on the cushion plate and the screw jack. Also included is a step S6 of using the residual settlement S1 at the relatively thin part of the natural foundation 残余 = the residual settlement S2 at the relatively thick part 残余 As a control, the part of the soft soil layer is reinforced for the purpose of reducing uneven settlement; when the strip foundation completed during construction is settled during use, the level of the support height of a certain angle of the strip foundation is achieved by adjusting the jacking of the screw jacks; the jacking height of the single screw jack is adjusted, or the screw jacks are adjusted in full height, so that the settlement of the entire project is controllable; the screw jacks are arranged on the four corners of the strip foundation, the uneven settlement of the entire site is converted to a specific strip foundation itself, or even a specific corner of the strip foundation, and the uneven settlement is eliminated by local adjustment of the strip foundation; the jacking height of the screw jack is required to be equal to the settlement height of the structure during use under different soil conditions; in the step S4, the height of the pile of the base plate is the same as the jacking height of the screw jack.

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