A method for repairing settlement of seismic isolation buildings by grouting

Abstract

The present invention discloses a method for repairing settlement of seismic isolation buildings by grouting. An independent foundation is provided at the bottom of the existing building, and a seismic isolation support is provided in the column on each independent foundation. There is uneven settlement in the independent foundation and the settlement of the existing building gradually increases from one side to the other. A grouting protection frame is detachably connected to the periphery of the seismic isolation support. The present invention is conducive to sharing the force of the seismic isolation support during grouting and lifting by setting the grouting protection frame, thereby avoiding damage to the original seismic isolation support; by the joint setting of the frame adjustment upper rod and the frame adjustment lower rod, it is conducive to ensuring the early plug-in and subsequent integral connection of the grouting protection frame; by the partitioned and layered grouting, it is conducive to controlling the rising force generated by the grouting, and is conducive to steadily controlling the deformation and force; by the linkage setting of the sensor and the grouting process, it is conducive to ensuring that the deformation and force of the grouting protection frame during the support process meet the design requirements, and timely adjust the grouting plan or strengthen the strength of the protection frame.

Description

Technical Field

[0001] The invention relates to the technical field of grouting and lifting, and in particular to a grouting repair method for settlement of a seismic isolation building. Background Art

[0002] Seismic isolation technology is widely used in the seismic design of buildings. By installing isolation devices (such as isolation supports and layers) between the building and its foundation, it effectively slows the transmission of seismic waves and reduces building vibration. However, in practice, buildings may experience uneven settlement and cracks due to uneven settlement of the foundation soil or other external factors. Traditional repair methods mainly address this issue through foundation reinforcement and grouting reinforcement. However, existing technologies are unable to effectively maintain the seismic isolation performance of seismic isolation buildings during settlement repair. Summary of the Invention

[0003] The invention provides a grouting repair method for seismic isolation building settlement, which is used to solve technical problems such as the setting, installation and process control of protection frames at seismic isolation supports during grouting repair.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] An independent foundation is set at the bottom of the existing building, and a seismic isolation bearing is set in the column on each independent foundation; the independent foundation has uneven settlement and the settlement of the existing building gradually increases from one side to the other; a grouting protection frame is temporarily connected around the seismic isolation bearing.

[0006] The grouting protection frame is a rectangular frame, and a detachably connected frame adjustment upper rod and frame adjustment lower rod are provided on one side of the rectangular frame;

[0007] The settlement grouting repair method for seismic isolation buildings is applied. The specific steps are as follows:

[0008] Step 1: Assess the settlement of existing buildings, check the settlement amount, settlement rate and uneven settlement of various parts of the building; and define the area for grouting repair and lifting;

[0009] Step 2: Based on the designated area, determine the height to which each independent foundation needs to be raised; based on this, fabricate a grouting protection frame; the length and width of the grouting protection frame are adapted to the distance between the edge of the isolation support and the upper or lower column; and the height of the grouting protection frame is adapted to the existing height of the isolation support at each independent foundation;

[0010] Step 3: During on-site installation, insert the sensor into the rectangular frame on one side and seal the opening with the detachable upper and lower rods. After installation, install the sensor on the rectangular frame.

[0011] Step 4: Arrange grouting holes around each independent foundation and perform independent grouting in each area according to the size of the settlement;

[0012] Step 5: First, grout a shallow reinforcement layer under the independent foundation, then a deep reinforcement layer under the shallow reinforcement layer, and then construct a lifting layer between the shallow reinforcement layer and the deep reinforcement layer; the shallow reinforcement layer and the deep reinforcement layer are grouted using a multi-layer grouting method, and grouting is performed synchronously and proportionally according to the height of the lifting layer; the grouting protection frame is monitored during the grouting process until the independent foundation is lifted to the design elevation;

[0013] Step six: After the grouting is completed, the isolation bearings are calibrated and fine-tuned for the second time to ensure that their position, stress and deformation state meet the design requirements; then the grouting protection frame is withdrawn to complete the grouting lifting repair of the isolation building.

[0014] Furthermore, the existing building is a frame structure, and the columns of the existing building are divided into an upper column and a lower column at the seismic isolation support; the upper column and the lower column are both reinforced concrete columns.

[0015] Furthermore, the independent foundation is a stepped extended foundation; the bottom of the independent foundation is the top surface of the shallow reinforcement layer, and the total thickness of the shallow reinforcement layer, the lifting layer and the deep reinforcement layer under each independent foundation is the same, that is, the bottom elevation of the deep reinforcement layer is on the same horizontal plane, and the thickness of the deep reinforcement layer and the lifting layer are adjusted accordingly according to the amount of settlement.

[0016] Furthermore, the grouting protection frame includes four frame columns arranged in a rectangular or square shape, frame fixing upper rods and frame fixing lower rods connected between adjacent frame columns on three sides, frame fixing web rods arranged between the frame fixing upper rods and the frame fixing lower rods, frame adjustment upper rods and frame adjustment lower rods detachably connected to the other side, and frame adjustment web rods connected between the frame fixing upper rods and the frame fixing lower rods;

[0017] The components on the three sides form a U-shaped frame, and the openings of the U-shaped frame correspond to the plug-in isolation supports.

[0018] Furthermore, the strength of the frame column corresponds to the pressure and lateral force that the seismic isolation bearing needs to bear during reinforcement and lifting; a wedge plate is removable between the top of the frame column and the bottom of the upper column, and the thickness and angle of the wedge plate correspond to the height fine-tuned during on-site installation.

[0019] Furthermore, an electrically or hydraulically controlled adjustable support is provided at the bottom of each frame column, which is automatically raised and lowered according to the conditions of each corner during on-site installation.

[0020] Furthermore, the frame-adjustable web rod and the frame-fixing web rod are both arranged in a V-shape, and the bottom of the V-shaped member is arranged in the middle of the frame-fixing lower rod or the frame-adjustable lower rod.

[0021] Furthermore, the frame adjustment upper rod and the frame adjustment lower rod are respectively connected to the frame column body by bolts or clamps; a sensor is installed in the middle of each frame column body, and the sensor is a stress sensor and a strain sensor.

[0022] Furthermore, the sensor is connected to the control terminal to monitor stress and strain changes in real time during the grouting process. When stress and strain suddenly change or are greater than the designed stress and strain, the grouting is stopped in time; the grouting protection frame is subjected to stress assessment or reinforcement until it meets the design requirements, and then grouting is carried out.

[0023] The beneficial effects of the present invention are embodied in:

[0024] The present invention facilitates sharing the stress of the seismic isolation support during grouting and lifting repair by setting up a grouting protection frame, thereby avoiding damage to the original seismic isolation support; the joint setting of the frame adjustment upper rod and the frame adjustment lower rod facilitates ensuring the early plug-in and subsequent integral connection of the grouting protection frame; the partitioned and layered grouting facilitates controlling the upward force generated by the grouting, and facilitates steady control of deformation and stress; the setting of the wedge block at the top of the grouting protection frame and the adjustable support at the bottom facilitates precise support on site and adaptation to height differences during the process. The linkage setting of the sensor and the grouting process facilitates ensuring that the deformation and stress of the grouting protection frame during support meet the design requirements, and timely adjusting the grouting scheme or strengthening the strength of the protection frame; other features and advantages of the present invention will be described in the subsequent description, and partly become apparent from the description, or understood through the implementation of the present invention; the main purpose and other advantages of the present invention can be achieved and obtained through the scheme specifically pointed out in the description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the grouting structure of a seismic isolation building;

[0026] Figure 2 It is a schematic diagram of the seismic isolation support, grouting protection frame and their connection structure;

[0027] Figure 3 It is a schematic diagram of the grouting protection frame structure;

[0028] Figure 4 This is a schematic diagram of the construction of lifting the grouting structure of a seismic isolation building.

[0029] Figure numbers: 1-existing building, 11-upper column, 12-lower column, 2-seismic isolation bearing, 3-independent foundation, 4-shallow reinforcement layer, 5-lifting layer, 6-deep reinforcement layer, 7-grouting protection frame, 71-column frame, 72-fixed upper rod, 73-fixed lower rod, 74-fixed web rod, 75-adjusted upper rod, 76-adjusted lower rod, 77-adjusted web rod, 8-sensor, 9-grouting hole. DETAILED DESCRIPTION

[0030] Take a certain building as an example. It is a concrete frame structure consisting of 6 floors, with each floor height of 3.6m. The concrete grade of the beams and slabs is C30, and the concrete grade of the frame columns is C40.

[0031] Geological Conditions: The foundation soil layers of this project primarily consist of miscellaneous fill, silt, clay, and silty clay. The miscellaneous fill, consisting primarily of broken bricks and ash, is 2.0 to 4.2 meters thick. The loess-like silty clay has medium dry strength and toughness and is 2.8 to 3.6 meters thick. The silt layer is uneven in texture and approximately 2.0 to 2.6 meters thick. The clay layer is soft-plastic to fluid-plastic and is 1.6 to 2.8 meters thick. The silty clay layer is interspersed with pebbles, with a maximum exposed thickness of 4.9 meters. A soft-plastic to fluid-plastic clay layer exists within a localized area of ​​the building at a depth of 8 to 10 meters. This locally weak underlying layer is unevenly distributed relative to the building's bearing stratum. Furthermore, the infiltration of surface water and the resulting low soil strength are the primary cause of the uneven foundation settlement. The settlement gradually increases from one side to the other, with the maximum settlement occurring at the lower right corner of the building plan, at 32 mm.

[0032] In this embodiment, an independent foundation 3 is provided at the bottom of the existing building 1, and a seismic isolation bearing 2 is provided in the column on each independent foundation 3; a grouting protection frame 7 is detachably and temporarily connected around the seismic isolation bearing 2. The column of the building is divided into an upper column 11 and a lower column 12 at the seismic isolation bearing 2; the upper column 11 and the lower column 12 are both reinforced concrete columns. The independent foundation 3 is a stepped extended foundation; the bottom of the independent foundation 3 is the top surface of the shallow reinforcement layer 4, and the total thickness of the shallow reinforcement layer 4, the lifting layer 5 and the deep reinforcement layer 6 under each independent foundation 3 is the same, that is, the bottom elevation of the deep reinforcement layer 6 is on the same horizontal plane, and the thickness of the deep reinforcement layer 6 and the thickness of the lifting layer 5 are adjusted accordingly according to the amount of settlement.

[0033] Combine Figures 1 to 4 As shown, the seismic isolation building settlement grouting repair method is applied, and the specific steps are as follows:

[0034] Step 1: Evaluate the settlement of the existing building 1, check the settlement amount, settlement rate and uneven settlement of various parts of the building; and define the area for grouting repair and lifting.

[0035] Step 2. According to the designated area, determine the height to which each independent foundation 3 needs to be raised; thereby, make the grouting protection frame 7; the length and width of the grouting protection frame 7 are adapted to the distance between the edge of the seismic isolation support 2 and the upper column 11 or the lower column 12; the height of the grouting protection frame 7 is adapted to the existing height of the seismic isolation support 2 at each independent foundation 3.

[0036] In this embodiment, the grouting protection frame 7 is a rectangular frame, and a detachably connected upper adjusting rod 75 and a lower adjusting rod 76 of the frame are provided on one side of the rectangular frame.

[0037] In this embodiment, the grouting protection frame 7 includes four frame columns 71 arranged in a rectangular or square shape, upper fixing rods 72 and lower fixing rods 73 connecting adjacent frame columns 71 on three sides, fixing web members 74 arranged between the upper fixing rods 72 and the lower fixing rods 73, upper adjusting rods 75 and lower adjusting rods 76 detachably connected to another side, and adjusting web members 77 connecting the upper fixing rods 72 and the lower fixing rods 73; the components on the three sides form a C-shaped frame, and the opening of the C-shaped frame is correspondingly inserted with the isolation bearing 2.

[0038] In this embodiment, both the adjusting web member 77 and the fixing web member 74 are arranged in a V shape, and the bottom of the V-shaped member is arranged in the middle of the lower fixing rod 73 or the lower adjusting rod 76.

[0039] Step 3: During on-site installation, insert and install through the C-shaped rectangular frame on one side, and seal the opening through the detachably connected upper adjusting rod 75 and lower adjusting rod 76; after installation, a sensor 8 is installed on the rectangular frame.

[0040] Step 4: Layout grouting holes around each independent foundation 3, and perform independent grouting in zones according to the settlement size at each location.

[0041] In this embodiment, the strength of the frame column 71 is set corresponding to the pressure and lateral force required to reinforce and lift the isolation bearing 2; a wedge plate is detachably arranged between the top of the frame column 71 and the bottom of the upper column 11, and the thickness and angle of the wedge plate correspond to the height fine-tuned during on-site installation. An adjustable support controlled by electricity or hydraulics is arranged at the bottom of each frame column 71, and automatic lifting adjustment is performed according to the conditions of each corner during on-site installation.

[0042] In this embodiment, the upper adjusting rod 75 and the lower adjusting rod 76 are respectively connected to the frame column 71 by bolts or hoop connections; a sensor 8 is installed in the middle of each frame column 71, and the sensor 8 is a stress sensor 8 and a strain sensor 8.

[0043] Step 5: First, grout and construct a shallow reinforcement layer 4 under the independent foundation 3, construct a deep reinforcement layer 6 under the shallow reinforcement layer 4, and then construct a lifting layer 5 between the shallow reinforcement layer 4 and the deep reinforcement layer 6; the shallow reinforcement layer 4 and the deep reinforcement layer 6 are grouted by a multi-layer grouting method, and grouting is performed synchronously and in equal proportion according to the height of the lifting layer 5; during the grouting process, process monitoring is performed on the grouting protection frame 7 until the independent foundation 3 is lifted to the design elevation.

[0044] Step six: after the grouting is completed, the seismic isolation bearing 2 is calibrated and fine-tuned for the second time to ensure that its position, stress and deformation state meet the design requirements; then the grouting protection frame 7 is withdrawn to complete the grouting lifting repair of the seismic isolation building.

[0045] In this embodiment, the sensor 8 is connected to the control terminal to monitor the stress and strain changes in real time during the grouting process. When a sudden change in stress and strain occurs or the stress and strain are greater than the designed load-bearing capacity, the grouting is stopped in time; the grouting protection frame 7 is subjected to force assessment or reinforcement until it meets the design requirements, and then grouting is carried out.

[0046] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that a person skilled in the art can conceive within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for repairing settlement of seismic isolation buildings by grouting, characterized in that: An independent foundation (3) is provided at the bottom of an existing building (1), and a seismic isolation support (2) is provided in a column on each independent foundation (3); the independent foundation (3) has uneven settlement and the settlement of the existing building (1) gradually increases from one side to the other; a grouting protection frame (7) is detachably and temporarily connected around the seismic isolation support (2); The grouting protection frame (7) is a rectangular frame, and a detachably connected frame adjustment upper rod (75) and a frame adjustment lower rod (76) are provided on one side of the rectangular frame; The settlement grouting repair method for seismic isolation buildings is applied. The specific steps are as follows: Step 1: Evaluate the settlement of the existing building (1), check the settlement amount, settlement rate and settlement unevenness of each part of the building; and define the area for grouting repair and lifting; Step 2: According to the designated area, the height to be raised for each independent foundation (3) is determined; accordingly, a grouting protection frame (7) is produced; the length and width of the grouting protection frame (7) are adapted to the distance between the edge of the seismic isolation support (2) and the upper column (11) or the lower column (12); the height of the grouting protection frame (7) is adapted to the existing height of the seismic isolation support (2) at each independent foundation (3); Step 3: During on-site installation, the device is inserted into the rectangular frame on one side, and the opening is sealed by a detachable upper adjustment rod (75) and a lower adjustment rod (76); after the installation is completed, a sensor (8) is installed on the rectangular frame; Step 4: Arrange grouting holes around each independent foundation (3), and perform independent grouting in different areas according to the size of the settlement at each location; Step 5: First, a shallow reinforcement layer (4) is grouting-applied below the independent foundation (3), a deep reinforcement layer (6) is applied below the shallow reinforcement layer (4), and then a lifting layer (5) is applied between the shallow reinforcement layer (4) and the deep reinforcement layer (6); the shallow reinforcement layer (4) and the deep reinforcement layer (6) are grouting-applied using a multi-layer grouting method, and grouting is performed synchronously and proportionally according to the height of the lifting layer (5); during the grouting process, the grouting protection frame (7) is monitored until the independent foundation (3) is lifted to the design elevation; Step six, after the grouting is completed, the seismic isolation support (2) is calibrated and fine-tuned for the second time to ensure that its position, stress and deformation state meet the design requirements; and then the grouting protection frame (7) is withdrawn to complete the grouting lifting repair of the seismic isolation building.

2. A grouting repair method for seismic isolation building settlement according to claim 1, characterized in that: The existing building (1) is a frame structure, and the column of the existing building (1) is divided into an upper column (11) and a lower column (12) at the seismic isolation support (2); the upper column (11) and the lower column (12) are both reinforced concrete columns.

3. A grouting repair method for seismic isolation building settlement according to claim 1, characterized in that: The independent foundation (3) is a stepped expansion foundation; the bottom of the independent foundation (3) is the top surface of the shallow reinforcement layer (4); the total thickness of the shallow reinforcement layer (4), the lifting layer (5) and the deep reinforcement layer (6) below each independent foundation (3) is the same, that is, the bottom elevation of the deep reinforcement layer (6) is on the same horizontal plane, and the thickness of the deep reinforcement layer (6) and the thickness of the lifting layer (5) are adjusted accordingly according to the amount of settlement.

4. A grouting repair method for seismic isolation building settlement according to claim 1, characterized in that: The grouting protection frame (7) comprises four frame columns (71) arranged in a rectangular or square shape, a frame-fixing upper rod (72) and a frame-fixing lower rod (73) connected between adjacent frame columns (71) on three side surfaces, a frame-fixing web rod (74) arranged between the frame-fixing upper rod (72) and the frame-fixing lower rod (73), a frame-adjusting upper rod (75) and a frame-adjusting lower rod (76) detachably connected to the other side surface, and a frame-adjusting web rod (77) connected between the frame-fixing upper rod (72) and the frame-fixing lower rod (73); The components on the three sides form a U-shaped frame, and the opening of the U-shaped frame corresponds to the plug-in isolation support (2).

5. A grouting repair method for seismic isolation building settlement according to claim 4, characterized in that: The strength of the frame column (71) corresponds to the pressure and lateral force required to be borne by the seismic isolation support (2) during reinforcement and lifting; a detachable wedge plate is provided between the top of the frame column (71) and the bottom of the upper column (11), and the thickness and angle of the wedge plate correspond to the height fine-tuned during on-site installation.

6. A grouting repair method for seismic isolation building settlement according to claim 5, characterized in that: Each frame column (71) is provided with an electrically or hydraulically controlled adjustable support at the bottom, which is automatically adjusted in height according to the conditions of each corner during on-site installation.

7. A grouting repair method for seismic isolation building settlement according to claim 4, characterized in that: The frame-adjustable web rod (77) and the frame-fixing web rod (74) are both arranged in a V-shape, and the bottom of the V-shaped member is arranged in the middle of the frame-fixing lower rod (73) or the frame-adjustable lower rod (76).

8. The method for repairing settlement of a seismic isolation building by grouting according to claim 4, characterized in that: The frame adjustment upper rod (75) and the frame adjustment lower rod (76) are respectively connected to the frame column (71) by bolts or clamps; a sensor (8) is installed in the middle of each frame column (71), and the sensor (8) is a stress sensor (8) and a strain sensor (8).

9. A grouting repair method for seismic isolation building settlement according to claim 4, characterized in that: The sensor (8) is connected to the control terminal to monitor stress and strain changes in real time during the grouting process. When a sudden change in stress and strain occurs or the stress and strain are greater than the designed load-bearing capacity, the grouting is stopped in time; the grouting protection frame (7) is subjected to stress assessment or reinforcement until it meets the design requirements, and then grouting is carried out again.

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