Seismic insulation building settlement grouting repair method

Abstract

The invention discloses a grouting repair method for settlement of a seismic isolation building, which is characterized in that independent foundations are arranged at the bottom of the existing building, and a seismic isolation support is arranged in a column body on each independent foundation; the independent foundation has differential settlement, and the settlement amount of the existing building is gradually increased from one side to the other side; a grouting protection frame is detachably and temporarily connected to the periphery of the shock insulation support. Through the arrangement of the grouting protection frame, the stress of the shock insulation support during grouting lifting can be shared, and therefore damage to an original shock insulation support is avoided; through the combined arrangement of the frame adjusting upper rod and the frame adjusting lower rod, the early-stage insertion connection and subsequent integral connection of the grouting protection frame can be guaranteed; by means of partitioned and layered grouting, rising force generated by grouting can be controlled easily, and deformation and stress can be stably controlled easily; through linkage arrangement of the sensor and the grouting process, it is guaranteed that deformation and stress of the grouting protection frame in the supporting process meet the design requirements, and the grouting scheme is adjusted in time or the strength of the protection frame is enhanced in time.

Description

Technical Field

[0001] The present invention relates to the technical field of grouting and lifting, and particularly relates to a method for repairing settlement of a seismic isolation building by grouting. Background Art

[0002] Seismic isolation technology is widely used in the seismic design of buildings. By setting seismic isolation devices (such as seismic isolation bearings, seismic isolation layers, etc.) between the building and the foundation, the transmission of seismic waves is effectively slowed down, and the vibration of the building is reduced. However, in actual use, due to uneven settlement of the foundation soil or other external factors, problems such as uneven settlement and cracks may occur in the building. Traditional repair methods mainly solve the problems through means such as strengthening the foundation and grouting reinforcement, but the existing technology cannot effectively solve the problem of maintaining the seismic isolation performance during the settlement repair of seismic isolation buildings. Summary of the Invention

[0003] The present invention provides a method for repairing settlement of a seismic isolation building by grouting to solve technical problems such as the setting, installation, and process control of the protection frame at the seismic isolation bearing during grouting repair.

[0004] To achieve the above object, the present invention adopts the following technical solutions: An independent foundation is provided at the bottom of the existing building, and seismic isolation bearings are provided in the columns on each independent foundation; the independent foundation has uneven settlement and the settlement amount of the existing building gradually increases from one side to the other side; a grouting protection frame is detachably and temporarily connected around the seismic isolation bearing; The grouting protection frame is a rectangular frame, and a detachable frame adjusting upper rod and a frame adjusting lower rod are provided on one side of the rectangular frame; The method for repairing settlement of a seismic isolation building by grouting is applied, and the specific steps are as follows: Step 1: Evaluate the settlement situation of the existing building, check the settlement amount, settlement speed, and uneven settlement of each part of the building; delimit the area for grouting repair and lifting; Step 2: According to the delimited area, clarify the height that each independent foundation needs to be lifted; thus, fabricate the grouting protection frame; the length and width of the grouting protection frame adapt to the distance between the edge of the seismic isolation bearing and the upper column or the lower column; the height of the grouting protection frame adapts to the existing height of the seismic isolation bearing at each independent foundation; Step 3: During on-site installation, insert and install one side through a U-shaped rectangular frame, and seal the opening through the detachable frame adjusting upper rod and frame adjusting lower rod; after installation, sensors are installed on the rectangular frame; Step 4: Arrange grouting holes around each independent foundation, and perform independent grouting in zones according to the size of the settlement at each place; Step 5: First, grout a shallow reinforcement layer under the independent foundation, and 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 by a multi-layer grouting method, and grouting is performed synchronously and proportionally according to the height of the lifting layer; during the grouting process, the grouting protection frame is monitored until the independent foundation is lifted to the design elevation; Step six: After the grouting is completed, the seismic 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 seismic isolation building.

[0005] 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 bearing; the upper column and the lower column are both reinforced concrete columns.

[0006] 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.

[0007] Furthermore, the grouting protection frame comprises 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; 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.

[0008] Furthermore, the strength of the frame column body corresponds to the pressure and lateral force setting that the seismic isolation bearing needs to bear during reinforcement and lifting; a wedge plate is removable between the top of the frame column body and the bottom of the upper column body, and the thickness and angle of the wedge plate correspond to the height of fine-tuning during on-site installation.

[0009] 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.

[0010] 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.

[0011] 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.

[0012] Furthermore, the sensor 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 is subjected to stress assessment or reinforcement until it meets the design requirements, and then grouting is carried out.

[0013] The beneficial effects of the present invention are embodied in: The present invention, through the provision of a grouting protection frame, is conducive to sharing the stress of the seismic isolation bearing during grouting and lifting repair, thereby avoiding the damage of the original seismic isolation bearing; through the joint provision 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; through 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 stress; through the provision of the wedge block at the top of the grouting protection frame and the adjustable support at the bottom, it is conducive to precise support on site and adaptation to height difference changes during the process. Through the linkage setting of the sensor and the grouting process, it is conducive to ensuring that the deformation and stress of the grouting protection frame during the support process 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 explained in the subsequent description, and partly become obvious from the description, or be 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

[0014] Figure 1 It is a schematic diagram of the grouting structure of a seismic isolation building; Figure 2 It is a schematic diagram of the seismic isolation support, grouting protection frame and their connection structure; Figure 3 It is a schematic diagram of the grouting protection frame structure; Figure 4 This is a schematic diagram of the construction of lifting the grouting structure of a seismic isolation building.

[0015] 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 belly rod, 75-adjusted upper rod, 76-adjusted lower rod, 77-adjusted belly rod, 8-sensor, 9-grouting hole. DETAILED DESCRIPTION

[0016] Take a certain building as an example. It is a concrete frame structure consisting of 6 floors. The height of each floor is 3.6m. The concrete grade of the beams and slabs is C30, and the concrete grade of the frame columns is C40.

[0017] Geological conditions: The foundation soil layers of the project mainly include miscellaneous fill, silt layer, clay layer and silty clay. Miscellaneous fill is the foundation backfill soil, mainly broken bricks and ash, with a thickness of 2.0~4.2m; loess-like silty clay has medium dry strength and toughness, with a thickness of 2.8~3.6m; the silt layer is uneven, with a thickness of about 2.0~2.6m; the clay layer is in a soft plastic-fluid state, with a thickness of 1.6~2.8m; the silty clay layer is mixed with some pebbles, with a maximum exposure thickness of 4.9m. There is a soft plastic-fluid state clay layer within a depth of 8~10m in the local area of ​​the building. This local weak underlying layer is unevenly distributed with the building's bearing layer. At the same time, more surface water infiltrates, and the soil strength is low, which is the main reason for the uneven foundation settlement. The settlement gradually increases from one side to the other. The maximum settlement of the building is at the lower right corner of the building plane, with a maximum settlement of 32mm.

[0018] 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.

[0019] Combination Figures 1 to 4 As shown, the settlement grouting repair method of seismic isolation building is applied, and the specific steps are as follows: Step 1: Evaluate the settlement of the existing building 1, check the settlement amount, settlement speed and uneven settlement of various parts of the building; and define the area for grouting repair and lifting.

[0020] Step 2. According to the designated area, determine the height to which each independent foundation 3 needs to be lifted; thereby, produce the grouting protection frame 7; the length and width of the grouting protection frame 7 adapt to the distance between the edge of the seismic isolation bearing 2 and the upper column 11 or the lower column 12; the height of the grouting protection frame 7 adapts to the existing height of the seismic isolation bearing 2 at each independent foundation 3.

[0021] In this embodiment, 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.

[0022] In this embodiment, the grouting protection frame 7 includes four column bodies 71 arranged in a rectangular or square shape, a top fixing rod 72 and a bottom fixing rod 73 connected between adjacent column bodies 71 on three sides, a fixing web member 74 arranged between the top fixing rod 72 and the bottom fixing rod 73, an adjustable top rod 75 and an adjustable bottom rod 76 detachably connected to another side, and an adjustable web member 77 connected between the top fixing rod 72 and the bottom fixing rod 73; the components on three sides form a C-shaped frame, and the opening of the C-shaped frame is correspondingly inserted into the isolation bearing 2.

[0023] In this embodiment, both the adjustable 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 bottom fixing rod 73 or the adjustable bottom rod 76.

[0024] Step 3: During on-site installation, insert and install through a C-shaped rectangular frame, and block the opening with the detachable adjustable top rod 75 and adjustable bottom rod 76; after installation, a sensor 8 is installed on the rectangular frame.

[0025] Step 4: Layout grouting holes around each independent foundation 3, and perform independent grouting in zones according to the settlement size at each location.

[0026] In this embodiment, the strength of the column body 71 is set corresponding to the pressure and lateral force required to reinforce and lift the isolation bearing 2; a wedge-shaped plate is detachably arranged between the top of the column body 71 and the bottom of the upper column body 11, and the thickness and angle of the wedge-shaped 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 column body 71, and automatic lifting adjustment is performed according to the conditions of each corner during on-site installation.

[0027] In this embodiment, the adjustable top rod 75 and the adjustable bottom rod 76 are respectively connected to the column body 71 by bolts or hoop connections; a sensor 8 is installed in the middle of each column body 71, and the sensor 8 is a stress sensor 8 and a strain sensor 8.

[0028] Step 5: First, grout to 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 carried out synchronously and proportionally according to the height of the lifting layer 5; during the grouting process, process monitoring is carried out on the grouting protection frame 7 until the independent foundation 3 is lifted to the design elevation.

[0029] Step 6: After the grouting is completed, perform secondary calibration and fine-tuning on the isolation bearing 2 to ensure that its position, stress, and deformation state meet the design requirements; then remove the grouting protection frame 7 to complete the grouting lifting and repair of the isolated building.

[0030] 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.

[0031] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that a technician familiar with the technical field can think of within the technical scope disclosed in the present invention should be covered within the protection scope 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 the existing building (1), and a seismic isolation support (2) is provided in the 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 of seismic isolation building is applied, and the specific steps are as follows: Step 1: Evaluate the settlement of existing buildings (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; 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 manufactured; 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 one side of the rectangular frame, 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 groutingly 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 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, the grouting protection frame (7) is monitored until the independent foundation (3) is lifted to the designed elevation; Step six, after the grouting is completed, the seismic isolation bearing (2) is recalibrated and fine-tuned 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.

2. A grouting repair method for seismic isolation building settlement as claimed in 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 as claimed in claim 1, characterized in that: 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); 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 as claimed in claim 1, characterized in that: The grouting protection frame (7) comprises four frame columns (71) arranged in a rectangular or square shape, frame-fixing upper rods (72) and frame-fixing lower rods (73) connected between adjacent frame columns (71) on three side surfaces, frame-fixing web rods (74) arranged between the frame-fixing upper rods (72) and the frame-fixing lower rods (73), frame-adjusting upper rods (75) and frame-adjusting lower rods (76) detachably connected to the other side surface, and frame-adjusting web rods (77) connected between the frame-fixing upper rods (72) and the frame-fixing lower rods (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 as claimed in claim 4, characterized in that: The strength of the frame column (71) corresponds to the pressure and lateral force setting required for the seismic isolation support (2) to bear 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 as claimed in 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 raised and lowered according to the conditions of each corner during on-site installation.

7. A grouting repair method for seismic isolation building settlement as claimed in 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 at the middle of the frame-fixing lower rod (73) or the frame-adjustable lower rod (76).

8. A grouting repair method for seismic isolation building settlement as claimed in 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 as claimed in 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 stress assessment or reinforcement of the grouting protection frame (7) is performed until the design requirements are met, and then grouting is performed again.

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