Structure for actively controlling vertical displacement of building foundation

Abstract

This utility model relates to the field of civil engineering technology, specifically to a structure for actively controlling the vertical displacement of building foundations. It includes a vertical support structure comprising anchor piles, load-bearing cables, and a reinforcement zone. The reinforcement zone is located below the existing building foundation. The anchor piles are located on both sides of the existing foundation, and are connected by the load-bearing cables. The load-bearing cables are located below the reinforcement zone and bear the loads above it. The advantages of this utility model are: clear force transmission path and defined force system; convenient construction with minimal impact due to directional drilling; and significant implementation effect and good economic efficiency.

Description

Technical Field

[0001] This utility model relates to the field of civil engineering technology, specifically to a structure for actively controlling the vertical displacement of building foundations. It can be used to adjust the settlement of existing building foundations, protect existing building foundations from settlement, and reduce stress in certain areas below the foundation of existing buildings to a certain extent, thus ensuring the safety of newly constructed projects below. Background Technology

[0002] Existing buildings and structures experience foundation settlement due to their own weight, changes in geological conditions, and surrounding construction activities. This settlement can affect the functionality of the building or even compromise its structural safety. When construction is required beneath existing structures, the significant foundation pressure can also increase the risk of construction work. Common methods for controlling foundation settlement include foundation grouting and requiring construction companies to strengthen protection of existing structures during surrounding work. However, foundation grouting often struggles to control grout diffusion, resulting in less than ideal settlement control. Strengthening surrounding protection is a passive approach and cannot promptly remedy any adverse effects that may arise during the process. Summary of the Invention

[0003] The purpose of this utility model is to address the shortcomings of the existing technology by providing a structure that actively controls the vertical displacement of building foundations. Employing the principle of vertical support, a vertical support structure is constructed beneath the existing building foundation. This structure allows for flexible adjustment of the foundation's vertical displacement within a certain range according to predetermined values, protecting the existing foundation and preventing unbearable displacement. Simultaneously, it supports the existing foundation, enabling safe excavation beneath the existing building.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] A structure for actively controlling the vertical displacement of a building foundation, installed below the existing building foundation, is characterized by comprising a vertical support structure, which includes anchor piles, load-bearing cables, and a reinforcement zone. The reinforcement zone is located below the existing building foundation, the anchor piles are located on both sides of the existing building foundation, and the anchor piles on both sides are connected by the load-bearing cables. The load-bearing cables are located below the reinforcement zone and bear the loads above it.

[0006] The load-bearing cable includes steel strands, corrugated pipes, spiral reinforcements and sheathing pipes arranged sequentially from the inside out, and the corrugated pipes and sheathing pipes are filled and compacted by injection of concrete.

[0007] An anchor hole is pre-drilled at the top of the anchor pile, and the load-bearing cable is anchored to the anchor hole by an anchor.

[0008] Along the extension direction of the existing building foundation, several vertical support structures are arranged at intervals.

[0009] The advantages of this utility model are:

[0010] 1) The main tunnel of the load-bearing cable can be constructed by directional drilling, which has the advantages of fast hole formation and minimal disturbance to existing buildings and structures.

[0011] 2) The overall force structure is clear and the force and force transmission paths are well-defined.

[0012] 3) It can be used to adjust uneven settlement of foundations.

[0013] 4) It can be used to support existing buildings, making it easier to carry out construction work underneath them.

[0014] 5) Even after the anchor piles are removed, a composite foundation similar to the reinforcement strip can be formed in the strata at the bottom of the building, which can effectively control the later settlement.

[0015] 6) It has good reliability, good innovation and application value, and is worth promoting. Attached Figure Description

[0016] Figure 1 This is a plan view of the present invention;

[0017] Figure 2 This is a cross-sectional schematic diagram of the present invention;

[0018] Figure 3 This is a cross-sectional view of the load-bearing cable in this utility model;

[0019] Figure 4 for Figure 1 A diagram showing the connection of node A in the diagram;

[0020] Figure 5 This is a construction flowchart of this utility model. Detailed Implementation

[0021] The features and other related features of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments, so as to facilitate the understanding of those skilled in the art:

[0022] like Figure 1-5 As shown in the figure, the numbers 1-10 represent: 1. Existing building foundation, 2. Anchor pile, 3. Load-bearing cable, 4. Reinforcement zone, 5. Steel strand, 6. Corrugated pipe, 7. Spiral reinforcement, 8. Sheath pipe, 9. Anchor, and 10. Anchor hole.

[0023] Example: Figures 1 to 5As shown, in this embodiment, the structure for actively controlling the vertical displacement of the building foundation is set below the existing building foundation 1. It can flexibly adjust the vertical displacement of the foundation within a certain range according to a predetermined value, protect the existing building foundation, avoid unbearable displacement, support the existing building foundation, and enable safe excavation under the existing building.

[0024] Specifically, such as Figure 1 As shown, the structure in this embodiment includes several vertical support structures arranged at intervals along the extension direction of the existing building foundation 1. Figure 2 As shown, the vertical support structure includes anchor piles 2, load-bearing cables 3, and a reinforcement zone 4. The reinforcement zone 4 is located below the existing building foundation 1, and the anchor piles 2 are located on both sides of the existing building foundation 1. The anchor piles 1 on both sides are connected by load-bearing cables 3. The load-bearing cables 3 are located below the reinforcement zone 4 and bear the load above it.

[0025] like Figure 3 As shown, the load-bearing cable 3 includes, from the inside out, steel strands 5, corrugated pipes 6, spiral reinforcement 7, and sheathing pipes 8. The space between the corrugated pipes 6 and the sheathing pipes 8 is filled tightly with injected concrete. The steel strands 5 are inserted into the interior of the corrugated pipes 6, with a certain amount of slack left at both ends. The spiral reinforcement 7 is installed between the corrugated pipes 6 and the sheathing pipes 8. The spiral reinforcement 7 prevents the plain concrete from easily splitting under the large force of the steel strands 5.

[0026] Combination Figure 2 and Figure 4 As shown, the top of the anchor pile 2 has a pre-drilled anchor hole 10, and the steel strand 5 is anchored to the anchor hole 10 through the anchor.

[0027] like Figure 5 As shown, this embodiment includes the following steps when applied:

[0028] 1) Conduct health assessments and stress analyses on the existing building foundations 1 that need protection, and select appropriate locations and angles based on geological conditions to use directional drilling technology to create large-diameter holes for inserting protective pipes 8.

[0029] 2) Insert the corrugated pipe 6 with the reserved steel strand 5 and the spiral reinforcement 7 for local pressure bearing into the inside of the protective pipe 8; fill the space between the corrugated pipe 6 and the protective pipe 8 with concrete to make it have high strength.

[0030] 3) Insert steel strands 5 into the corrugated pipe 6, leaving a certain amount of slack at both ends of the steel strands 5 to complete the construction of the load-bearing cable 3.

[0031] 4) Grouting or jet grouting is carried out between the load-bearing cable 3 and the existing building foundation 1 to form a reinforced body 4, which is used to improve the strength and integrity of the soil between the two.

[0032] 5) Install anchor piles 2 that match the position of the load-bearing cable 3. When installing anchor piles 2, make sure to reserve anchor holes 10 at the top.

[0033] 6) After the anchor pile has reached the required strength, install the anchor 9 and connect the anchor pile 2 with the steel strand 5.

[0034] 7) Adjust the tension of the steel strand 5 appropriately according to the monitoring data or the base load value that needs to be reduced in order to actively adjust the vertical displacement value of the existing building foundation 1.

[0035] When applying this system, the capabilities of each load-bearing component must be considered, including:

[0036] 1) The sum of the vertical components of all axial forces on the cable 3 should not be less than the representative value of all gravity loads on the cable 3.

[0037] 2) The vertical bearing capacity of anchor pile 2 should be sufficient to satisfy the vertical force component of the load-bearing cable, and the horizontal bearing capacity should be sufficient to satisfy the horizontal force component of the load-bearing cable 3. The local bearing pressure and shear resistance of anchor pile 2 should also be calculated.

[0038] 3) The distribution of the load-bearing cables 3 should be dense rather than sparse. If the load-bearing cables 3 are too sparse, it will easily lead to the "piercing" shear failure of the soil or the excessive concentration of local stress in the foundation.

[0039] In the specific implementation of this embodiment, the key points to consider in the design and construction are: 1) Reasonably select the location and specifications of the anchor pile 2; 2) Reasonably select the outer diameter and spacing of the borehole of the load-bearing cable 3; 3) Consider grouting reinforcement between the base and the load-bearing cable 3 to improve the stratum parameters according to the stratum conditions; 4) Consider configuring spiral reinforcement 7 in the overall structure of the load-bearing cable 3 to improve the compressive strength of the component.

[0040] Although the above embodiments have described the concept and embodiments of the present invention in detail with reference to the accompanying drawings, those skilled in the art will recognize that various improvements and modifications can still be made to the present invention without departing from the scope of the claims, and therefore will not be elaborated here.

Claims

1. A structure for actively controlling the vertical displacement of building foundations, installed below existing building foundations, characterized in that: The structure includes a vertical support structure comprising anchor piles, load-bearing cables, and a reinforcement zone. The reinforcement zone is located below the foundation of the existing building structure. The anchor piles are located on both sides of the foundation of the existing building structure. The anchor piles on both sides are connected by the load-bearing cables. The load-bearing cables are located below the reinforcement zone and bear the load above it.

2. The structure for actively controlling the vertical displacement of building foundations according to claim 1, characterized in that: The load-bearing cable includes steel strands, corrugated pipes, spiral reinforcements and sheathing pipes arranged sequentially from the inside out, and the corrugated pipes and sheathing pipes are filled and compacted by injection of concrete.

3. A structure for actively controlling the vertical displacement of a building foundation according to claim 1, characterized in that: An anchor hole is pre-drilled at the top of the anchor pile, and the load-bearing cable is anchored to the anchor hole by an anchor.

4. A structure for actively controlling the vertical displacement of a building foundation according to claim 1, characterized in that: Along the extension direction of the existing building foundation, several vertical support structures are arranged at intervals.

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