Lifting and rectifying construction method for solving uneven settlement of building

Abstract

The application provides a jacking and rectification construction method for solving uneven settlement of a building. 2 The method determines the optimal rotation axis for rectification, thereby accurately calculating the jacking amount of each jacking jack for rectification, and reasonably and reliably correcting the inclined posture. The building rectification is risky, the rectification value of the building is effectively determined by constructing the integral tray beam to form a rigid foundation, and the accuracy and safety of the building rectification are improved.

Description

Technical Field

[0001] This invention relates to a jacking and tilt correction construction method for solving uneven settlement of buildings. Background Technology

[0002] Uneven settlement of existing buildings can compromise their structural stability and integrity, leading to cracks, wall tilting, and affecting aesthetics and functionality. It can even cause building collapse, endangering life and property. Therefore, uneven settlement of buildings must be taken very seriously. The causes include uneven foundation soil, incomplete design considerations of foundation characteristics and superstructure loads, construction errors, improper use of the building, environmental influences, and earthquakes.

[0003] In cities, uneven settlement is particularly severe in old buildings, especially those with historical significance. Due to the brick-concrete structure and years of disrepair, the foundation of the building is not a rigid body, and the settlement values ​​of different parts do not form a certain proportional relationship, resulting in a large difference in uneven settlement.

[0004] How to reasonably adjust the uneven settlement of buildings, "straighten" them, and effectively reduce the risk of collapse caused by structural distortion is an urgent problem to be solved. Summary of the Invention

[0005] The purpose of this invention is to provide a jacking and tilt correction construction method for solving uneven settlement of buildings.

[0006] To address the above problems, this invention provides a jacking and tilt correction construction method for resolving uneven settlement of buildings, comprising:

[0007] Through holes are made in the walls of the building with uneven settlement, connecting beams are inserted, and concrete support beams are poured along both sides of the walls of the building with uneven settlement. The two ends of the connecting beams passing through the walls are anchored in the support beams on both sides of the walls, and the support beams are perpendicular to the connecting beams. Ground beams are set in the foundation of the parts of the building without walls and columns, and the ground beams are connected with the support beams to form a whole, forming a rigid foundation for the building to be corrected.

[0008] Piling holes are pre-drilled on the support beams on both sides of the wall. Static pressure anchor piles are driven in according to design requirements, and leveling devices are installed to lift the wall. A concrete base slab is poured at the bottom of the building, and jacks are installed under the support beams or ground beams. After the replacement of the supports is completed, all static pressure anchor piles are removed.

[0009] Measure the settlement value at each settlement point at the plinth of the wall to determine the initial state of the building to be corrected;

[0010] Based on the initial settlement data of the building, a reasonable rotation axis is determined, the optimal rotation axis is selected, and the lifting value of each lifting jack is calculated.

[0011] The lifting of each jack is controlled based on a determined lifting value in order to correct the building's deviation.

[0012] Furthermore, in the above method, a reasonable axis of rotation is determined based on the initial settlement data of the building, including:

[0013] The settlement point with the smallest settlement value is taken as the zero point for tilt correction, and the settlement point with the largest settlement value and a randomly selected settlement point are taken as control points. Based on the zero point for tilt correction and the control points, the corresponding rotation axis is obtained.

[0014] If OC1A1D1 represents the initial state of the four corner points of a plane after uneven settlement of a building, and plane OCAD represents the foundation plane of the building after jacking and correction, then point O is the point with the smallest settlement value, which is assumed to be the zero point of correction, and point A1 is the point with the largest settlement. The jacking amount at point A is the actual settlement y at point A. A Choose plane CC1A1A, and the extensions of A1C1 intersect at point O1. Select any two points other than O, and the straight line OO1 will be a rotation axis for determining the lifting amount.

[0015] Furthermore, in the above method, selecting the optimal rotation axis includes:

[0016] The goodness of fit R of the lifting amount of each rotation axis OO1 was calculated using linear regression. 2 Select R 2 The rotation axis closest to 1 is taken as the optimal rotation axis.

[0017] Furthermore, in the above method, R is selected from each rotation axis OO1. 2 The rotation axis closest to 1 is considered the optimal rotation axis, including:

[0018] Assumption The lift value at point i is calculated using a certain rotation axis OO1, y i That is the settlement value at point i. It is all y i The average value of the values, where point i is a settlement point in a settlement plane other than the zero point of tilt correction, with respect to the R value of the rotation axis. 2 The goodness-of-fit coefficient can be calculated using the following formula:

[0019]

[0020] R 2 The closer the value is to 1, the better the fit, meaning that the corresponding rotation axis is the optimal rotation axis.

[0021] Furthermore, in the above method, the lifting value of each jack is determined based on the optimal rotation axis, including:

[0022] Calculate the vertical distance from each jack to the rotation axis OO1, and the vertical distance y from point A (where the settlement value is the largest) to the rotation axis OO1. A The ratio is the lifting and tilt correction ratio coefficient ζ, then the tilt correction amount at each jack is y. A ·ζ, the lifting amount at point A is the actual settlement amount at point A, y. A .

[0023] Compared with existing technologies, this invention is based on the assumption of a rigid foundation. First, a rigid foundation is formed by constructing an integral support beam at the bottom of the building to be corrected. Then, the initial settlement state of the building foundation is measured, and finally, R... 2 The method determines the optimal rotation axis for tilt correction, thereby accurately calculating the lifting amount of each tilt correction jack and reasonably and reliably correcting the tilt posture.

[0024] This invention assumes the existing building is a rigid body, and assumes a rotation axis based on the settlement value of each settlement point, through R... 2 This invention determines the optimal rotation axis, accurately calculates the tilt correction amount for each jack, and summarizes this into a jacking and tilt correction construction method. Building tilt correction carries significant risks; this invention effectively determines the tilt correction value for buildings, improving the accuracy and safety of tilt correction.

[0025] This invention is applicable to existing buildings that have experienced uneven settlement. By scientifically and rationally determining the lifting amount and adjustment procedure of each jack during the jacking and adjustment process, the building can be adjusted to a relatively horizontal position, correcting the building's tilt and settlement "shape," while ensuring the building's structural safety and extending its service life. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a lifting and tilt correction structure for uneven settlement of a building according to an embodiment of the present invention;

[0027] Figure 2 This is a flowchart of a method for jacking up and correcting uneven settlement of a building according to an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the building before and after tilt correction and a schematic diagram of the rotation axis according to an embodiment of the present invention. Detailed Implementation

[0029] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figures 1 to 3 As shown, this invention provides a jacking and tilt correction construction method for solving uneven settlement of buildings, comprising:

[0031] Step S1: Through holes are made in the walls of the building with uneven settlement, connecting beams are inserted, and concrete pallet beams are poured along both sides of the walls of the building with uneven settlement. The two ends of the connecting beams passing through the walls are anchored in the pallet beams on both sides of the walls, and the pallet beams are perpendicular to the connecting beams. Ground beams are set in the foundation parts of the areas without walls and columns of the building with uneven settlement. The ground beams are connected with the pallet beams to form a whole, forming a rigid foundation for the building to be corrected.

[0032] like Figure 1 As shown, tray beams 1 are cast along both sides of the wall 4 of the building with uneven settlement. The two ends of the connecting beam 2 passing through the wall 4 are respectively connected to the tray beams 1 on both sides of the wall. The tray beams 1 are perpendicular to the connecting beams 2. Ground beams 3 are set in the areas of the building without walls and columns with uneven settlement. The ground beams 3 are respectively connected to the adjacent tray beams 1. The tray beams are 800x800mm in size. A steel pipe connecting beam passing through the wall is set every 0.5 to 1.5m along the longitudinal direction of the tray beams. The width of the ground beams is 800 to 1970mm and the height is 800mm.

[0033] Here, after the rigid foundation of the building with uneven settlement is constructed, the jacking amount is determined by the rotating plane method.

[0034] Step S2: Measure the settlement value of each settlement point at the wall plinth location, and determine the optimal rotation axis for jacking based on the settlement value of each settlement point;

[0035] Piling holes are reserved on the tray beams on both sides of the wall. Static pressure anchor piles are driven in according to the design requirements. A leveling device is installed to lift the wall. A concrete base slab is poured at the bottom of the building. Jacks are installed under the tray beams or ground beams. After the replacement of the supports is completed, each static pressure anchor pile is removed.

[0036] Specifically, the wall foundation is removed, and pre-drilled pile holes are made on the support beams on both sides of the wall. Static pressure anchor piles are driven in according to the design requirements, and a leveling device is installed to lift the building. A concrete base slab is poured at the bottom of the building, and jacks are installed under the support beams or ground beams. After the replacement of the supports is completed, all static pressure anchor piles are removed.

[0037] The lifting jacks are positioned under the pallet beam or ground beam: a total of 180 jacks can be installed, with a jack specification of 200T / 140mm. The 180 jacks are grouped according to their proximity and similar load, forming 43 lifting control groups. To facilitate precise lifting control, each group is equipped with a wire-type displacement sensor, and each jack is equipped with a pressure sensor. The wire-type displacement sensor is positioned at the resultant force center of each group of jacks to better measure the lifting displacement and pressure.

[0038] Step S3: Measure the settlement value at each settlement point at the plinth of the wall to determine the initial state of the building to be corrected;

[0039] For example, when measuring the settlement points at the plinth of the first floor, the point with the largest settlement value is located at the northeast corner, and the point with the smallest settlement value is located at the northwest corner. The settlement value of the northeast corner relative to the northwest corner is 35.1cm.

[0040] Step S4: Based on the initial settlement data of the building, determine a reasonable rotation axis and select the optimal rotation axis;

[0041] Here, the optimal rotation axis is determined: the goodness of fit R of the lifting amount for each rotation axis OO1 can be calculated using linear regression. 2 Select R 2 The rotation axis closest to 1 is taken as the optimal rotation axis; for example, from the first rotation axis, the second rotation axis, and the third rotation axis, the optimal rotation axis is selected as the first rotation axis;

[0042] Assumption The lift value at point i is calculated using a certain rotation axis OO1, y i That is the settlement value at point i. It is all y i The average value of the values, where point i is a settlement point in a settlement plane other than the zero point of tilt correction, with respect to the R value of the rotation axis. 2 The goodness-of-fit coefficient can be calculated using the following formula:

[0043] R 2 The closer the value is to 1, the better the fit, meaning that the corresponding rotation axis is the optimal rotation axis.

[0044] For example, R 2 The optimal rotation axis is determined as follows: Using corner point 11 in a settlement plane as the corner point O with the minimum settlement value (zero point for tilt correction), and corner points 3 and 4 as control points, the first rotation axis is found. Using corner point 11 as the corner point O with the minimum settlement value (zero point for tilt correction), and corner points 4 and 6 as control points, the second rotation axis is found. Using corner point 11 as the corner point O with the minimum settlement value (zero point for tilt correction), and corner points 4 and 12 as control points, the third rotation axis is found. The R-axis of the first rotation axis is calculated. 2 =0.91, R of the second rotation axis 2 =0.85, R of the third rotation axis 2 =0.88, the first rotation axis has a better fit, so it is selected as the optimal rotation axis.

[0045] For example, such as Figure 3As shown, if OC1A1D1 represents the initial state of the four corner points of a plane after uneven settlement of the building, and plane OCAD represents the foundation plane of the building after jacking and correction, then point O is the point with the smallest settlement value, which is assumed to be the zero point of correction, and point A1 is the point with the largest settlement. The jacking amount at point A is the actual settlement y at point A. A Choose any point C other than O and A. The extensions of A1C1 and AC intersect at point O1. The straight line OO1 is a rotation axis for determining the lifting amount. Using the same method, for each point C chosen, many different points O1 can be found, resulting in different rotation axes OO1, such as the first rotation axis, the second rotation axis, and the third rotation axis.

[0046] Step S5: Calculate and determine the lifting value of each lifting jack based on the optimal rotation axis;

[0047] Here, the lifting value of the jacks is determined: based on the selected first rotating axis, the lifting value of the 43 lifting control groups can be calculated.

[0048] Calculate the vertical distance from each jack to the rotation axis OO1. The ratio of this vertical distance to the vertical distance from the settlement point A (where the settlement value is largest) to the rotation axis OO1 is the jacking and tilt correction ratio coefficient ζ. Then, the jacking value at each jack is y. A ·ζ, the lifting amount at point A is the actual settlement amount at point A, y. A

[0049] The lifting of each jack is controlled based on a determined lifting value in order to correct the overall deviation of the building.

[0050] Here, the lifting and tilt correction is carried out by controlling the stroke of the jack, with a lifting amount not exceeding 3-5 cm per day;

[0051] The building's elevation and tilt data can be re-measured every half day or every day for verification until the building is corrected to meet the requirements.

[0052] Step S6: After the overall building is corrected, pour an additional concrete structure at the bottom of the building to connect with the upper old wall structure, and then remove the jacks.

[0053] Ultimately, the old building was tilted by a total of 30cm.

[0054] This invention, based on the assumption that the existing building foundation is a rigid body, uses R... 2 The method of determining the lifting amount by rotating the shaft involves determining the position of the lifting jacks and the amount of lifting to correct tilt. The foundation is then rotated around a certain rotating axis to reasonably and reliably improve and correct settlement and tilt.

[0055] This invention, based on the existing building as a rigid body, assumes a plane of rotation according to the settlement values ​​of each settlement point, and uses R... 2This invention determines the optimal plane of rotation, accurately calculates the tilt correction amount for each jack, and summarizes this into a jacking and tilt correction construction method. Building tilt correction carries significant risks; this invention effectively determines the tilt correction value for buildings, improving the accuracy and safety of tilt correction.

[0056] This invention is applicable to existing buildings that have experienced uneven settlement. By scientifically and rationally determining the lifting amount and adjustment procedure of each jack during the jacking and adjustment process, the building can be adjusted to a relatively horizontal position, correcting the building's tilt and settlement "shape," while ensuring the building's structural safety and extending its service life.

[0057] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0058] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0059] Obviously, those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Therefore, if these modifications and variations fall within the scope of the claims of the invention and their equivalents, the invention is also intended to include these modifications and variations.

Claims

1. A jacking and tilt correction construction method for solving uneven settlement of buildings, characterized in that, include: Through holes are made in the walls of the building with uneven settlement, connecting beams are inserted, and concrete support beams are poured along both sides of the walls of the building with uneven settlement. The two ends of the connecting beams passing through the walls are anchored in the support beams on both sides of the walls, and the support beams are perpendicular to the connecting beams. Ground beams are set in the foundation of the parts of the building without walls and columns, and the ground beams are connected with the support beams to form a whole, forming a rigid foundation for the building to be corrected. Measure the settlement value at each settlement point at the plinth of the wall, and determine the optimal rotation axis for jacking based on the settlement value of each settlement point. This includes: measuring the settlement value at each settlement point at the plinth of the wall to determine the initial state of the building to be corrected; determining a reasonable rotation axis based on the initial settlement data of the building; selecting the optimal rotation axis; and calculating the lifting value of each jack based on the optimal rotation axis. Piling holes are reserved on the tray beams on both sides of the wall. Static pressure anchor piles are driven in according to the design requirements. A leveling device is installed to lift the wall. A concrete base slab is poured at the bottom of the building. Jacks are installed under the tray beams or ground beams. After the replacement of the supports is completed, each static pressure anchor pile is removed. The lifting of each jack is controlled based on a determined lifting value in order to correct the building's deviation. Based on the initial settlement data of the building, determine a reasonable axis of rotation, including: The settlement point with the smallest settlement value is taken as the zero point for tilt correction, and the settlement point with the largest settlement value and a randomly selected settlement point are taken as control points. Based on the zero point for tilt correction and the control points, the corresponding rotation axis is obtained. If OC1A1D1 represents the initial state of the four corner points of a plane after uneven settlement of a building, and plane OCAD represents the foundation plane of the building after jacking and correction, then point O is the point with the smallest settlement value, which is assumed to be the zero point of correction, and point A1 is the point with the largest settlement. The jacking amount at point A is the actual settlement y at point A. A Choose plane CC1A1A, where the extensions of A1C1 and AC intersect at point O1. The straight line OO1 is a rotation axis for determining the lifting amount. Selecting the optimal axis of rotation includes: The goodness of fit R of the lifting amount of each rotation axis OO1 was calculated using linear regression. 2 Select R 2 The rotation axis closest to 1 is taken as the optimal rotation axis.

2. The jacking and tilt correction construction method for solving uneven settlement of buildings as described in claim 1, characterized in that, Select R from each rotation axis OO1 2 The rotation axis closest to 1 is considered the optimal rotation axis, including: Assumption The lift value at point i is calculated using a certain rotation axis OO1. That is the settlement value at point i. It is all The average value of the values, where point i is a settlement point in a settlement plane other than the zero point of tilt correction, with respect to the R value of the rotation axis. 2 The goodness-of-fit coefficient is calculated using the following formula: R 2 The closer the value is to 1, the better the fit, meaning that the corresponding rotation axis is the optimal rotation axis.

3. The jacking and correction construction method for uneven settlement of buildings as described in claim 1, characterized in that, Based on the optimal rotation axis, the lifting value of each lifting jack is calculated and determined, including: Calculate the vertical distance from each jack to the rotation axis OO1, and the vertical distance y from point A (where the settlement value is the largest) to the rotation axis OO1. A The ratio is the lifting and tilt correction ratio coefficient ζ, then the tilt correction amount at each jack is y. A ·ζ, the lifting amount at point A is the actual settlement amount at point A, y. A .

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