Nondestructive repair construction method for ancient building foundation

Abstract

The invention discloses a non-destructive repair construction method for an ancient building foundation, and relates to the field of building construction, and the method comprises the following steps: surveying and setting out, and arranging hole sites; drilling by using a drilling machine; high-pressure water is used for cleaning the hole, the sleeve valve pipe is put into the hole, and the upper end of the sleeve valve pipe is exposed out of the ground; the portion, within the depth range of 1 m, around the hole opening, of the ground is blocked with quick-setting cement mortar; stirring and preparing a grouting material; and slurry is poured, sectional type grouting is adopted in the grouting mode, and in the grouting process, after grouting of each section is completed, the core pipe is moved upwards or downwards by the length of one step pitch. The problem that inconvenience is brought to social production and life by ancient building repairing construction can be solved.

Description

Technical Field

[0001] The present application relates to the field of building construction technology, and in particular to a non-destructive repair construction method for ancient building foundations. Background Art

[0002] With the emphasis on historical features and cultural relics protection buildings, the proportion of ancient building repair construction in construction is gradually increasing. In the repair of ancient buildings, the parts of the floor that are bent, cracked or severely damaged are often frequently used areas. If they are repaired locally, the use function will be interrupted, causing many inconveniences to social production and life. Summary of the invention

[0003] In order to reduce the inconvenience caused by the repair and construction of ancient buildings to social production and life, the present application provides a non-destructive repair construction method for the foundation of an ancient building.

[0004] The present application provides a non-destructive repair construction method for ancient building foundations using the following technical solutions: A non-destructive repair construction method for the foundation of an ancient building comprises the following steps: measuring and setting out, arranging hole positions; drilling holes by using a drilling rig; cleaning the holes by using high-pressure water, lowering a sleeve valve pipe into the holes, with the upper end of the sleeve valve pipe exposed above the ground; sealing the ground around the hole opening within a depth of 1m with quick-setting cement mortar; mixing and preparing grouting materials; pouring grouting materials, wherein the grouting method adopts segmented grouting, and during the grouting process, after each segment of grouting is completed, the core pipe length of a step distance is moved upward or downward.

[0005] By adopting the above technical scheme, during the repair construction of the foundation of the ancient building, the foundation of the ancient building with diseases is accurately located and repaired by layered compaction grouting. Cement slurry or chemical slurry is injected at a higher pressure. During grouting, the slurry first fills the larger gaps and then penetrates into the pores of the soil under greater pressure; as the soil is squeezed until shear cracks appear and splitting occurs, the slurry fills the cracks to form slurry veins, and further forms a new mesh skeleton structure in the soil. Since the slurry veins occupy a part of the space in the soil during the formation process, and the soil is compacted, a new slurry vein composite foundation is formed, which not only improves the strength and anti-seepage performance of the soil, but also changes the physical and mechanical properties of the soil, and improves the bearing capacity of the soft soil foundation. During the grouting process, porous interval grouting is adopted, which is conducive to reducing the excessive deformation of the soil during the grouting process and ensuring that the load can be evenly distributed, thereby reducing the additional settlement of the existing building foundation caused by grouting, and then helping to ensure the quality of foundation reinforcement. On the other hand, the use of layered compaction grouting can reduce the work of breaking the ground, which is conducive to reducing the inconvenience and economic losses caused by the repair of ancient buildings to social production and life, and is conducive to shortening the construction period. In addition, the compaction grouting equipment is small and easy to operate, which reduces the difficulty of construction, helps to reduce the work intensity of construction personnel, etc., and can improve the utilization rate of human and material resources.

[0006] Optionally, the slurry to be stirred is cement mortar, and synthetic fibers are mixed into the cement mortar. The diameter range of the synthetic fibers is 0.2-1 mm, and the length range is 10 mm-30 mm.

[0007] By adopting the above technical solution, cement mortar is used as the reinforcement material, which can reduce the construction cost and the skill requirements for construction workers. Mixing synthetic fibers into cement mortar is conducive to improving the tensile strength of the cement material after solidification, making the cement material less likely to crack, thereby helping to prolong the maintenance time after foundation repair; synthetic fibers are flexible and are not likely to affect grouting resistance, and synthetic fibers can deform to adapt to the tortuous cracks in the soil, so that synthetic fibers can reach deeper soil cracks.

[0008] Optionally, a weighted rubber ball is bonded and fixed to one end of the synthetic fiber, and the weighted rubber ball is a mixed material of rubber and metal powder.

[0009] By adopting the above technical solution, the weight of one end of the rubber ball where the synthetic fiber is arranged is relatively large. When the synthetic fiber flows with the cement slurry, one end of the rubber ball can pull the synthetic fiber to flow, so that the length direction of the synthetic fiber is closer to the extension direction of the cement mortar veins, which is conducive to making the synthetic fiber fully play its reinforcing role. Metal powder can increase the density, so that the rubber ball has a large weight with a small density.

[0010] Optionally, the synthetic fibers have different wire diameters and different length specifications.

[0011] By adopting the above technical solution, synthetic fibers with different wire diameters and lengths can produce different effects.

[0012] Optionally, when drilling with a drilling rig, a shock-absorbing base for supporting the drilling rig is set up at the construction site, the shock-absorbing base includes a receiving groove and a support seat, the receiving groove is provided with a non-Newtonian fluid filler, the support seat is located on the inner side of the receiving groove, and the peripheral side of the support seat is provided with a rubber sealing layer, and the rubber sealing layer abuts against the inner peripheral surface of the receiving groove.

[0013] By adopting the above technical solution, the non-Newtonian fluid filler of the shock-absorbing base is sealed and stored in the space between the receiving groove and the support seat, and the rubber sealing layer can seal the gap between the support seat and the receiving groove, so that the non-Newtonian fluid filler is not easy to seep outward under the pressure of the gravity of the drilling rig. When the shock-absorbing base supports the drilling rig, the vibration energy generated by the drilling rig during operation will be absorbed by the non-Newtonian fluid filler, thereby reducing the impact of vibration during the drilling process on the ancient building.

[0014] Optionally, the lower surface of the support seat is a concave spherical surface, conical surface or pyramidal surface.

[0015] By adopting the above technical solution, the lower surface of the support seat is set as a concave spherical surface, conical surface or pyramidal surface, so that the lower surface of the support seat can guide the non-Newtonian fluid filler to the center of the support seat, making it difficult for the non-Newtonian fluid filler to flow to the fitting gap between the support seat and the receiving groove, thereby further reducing the seepage of the non-Newtonian fluid to the outside of the shock-absorbing base.

[0016] Optionally, the support seat is a sheet metal structure, the support seat includes a conical plate and a support plate, the peripheral edge of the support plate is provided with a cylindrical wall, the conical plate is located on the inner side of the cylindrical wall, the peripheral edge of the conical plate is welded and fixed to the inner peripheral surface of the cylindrical wall, and a plurality of reinforcing ribs are provided between the conical plate and the cylindrical wall; the rubber sealing layer is located on the outer peripheral surface of the cylindrical wall.

[0017] By adopting the above technical solution, the support seat is set as a sheet metal structure, which can reduce the weight of the support seat, making the shock-absorbing base relatively light and easy to carry and transfer. The cylinder wall of the support seat is a sheet metal structure. When the pressure of the non-Newtonian fluid filler acts on the cylinder wall, the cylinder wall can be elastically deformed, causing the cylinder wall to squeeze the rubber sealing layer, thereby enhancing the sealing between the cylinder wall and the receiving groove.

[0018] Optionally, positioning tubes are respectively provided on both sides of the accommodating groove, and positioning anchor rods are inserted into the positioning tubes, and the positioning anchor rods are used to be inserted into the soil.

[0019] By adopting the above technical solution, the positioning anchor rod is inserted into the soil after passing through the positioning tube located on the side of the receiving groove, so that the receiving groove is positioned by the positioning anchor rod, thereby reducing the movement of the shock-absorbing base due to the vibration of the drilling rig, which is beneficial to keep the position of the drilling rig stable during the drilling process.

[0020] Optionally, multiple shock-absorbing bases are provided, and the multiple shock-absorbing bases jointly support the drilling rig; when the drilling rig needs to move, a new shock-absorbing base is placed in front of the moving direction of the drilling rig. After the drilling rig moves to the new shock-absorbing base, the drilling rig moves away from one or several of the shock-absorbing bases, and then the shock-absorbing base leaving the drilling rig is moved to the front of the moving direction of the drilling rig so that the drilling rig can continue to move forward.

[0021] By adopting the above technical solution, multiple shock-absorbing bases are used to support the drilling rig, so that the shock-absorbing base can adapt to drilling rigs of different sizes. When the drilling rig needs to move between different hole positions, the shock-absorbing base is moved alternately so that the drilling rig can move continuously, and the drilling rig can be kept on the shock-absorbing base during the movement without moving the drilling rig up and down, making the movement of the drilling rig more convenient.

[0022] Optionally, in cases where drilling and grouting need to be carried out in areas close to buildings or even on the ground inside ancient buildings, before drilling, shock-absorbing fillers need to be laid between the drilling equipment and the ancient buildings that need to be protected; when laying the shock-absorbing fillers, first dig a ditch between the drilling equipment and the ancient buildings that need to be protected, then lay a braided hose at the bottom of the ditch, then pour non-Newtonian fluid into the hose, and tie and seal both ends of the braided hose so that the braided hose covers the bottom of the ditch; then place a heavy object on the hose filled with the non-Newtonian fluid.

[0023] By adopting the above technical solution, a ditch is dug between the building and the drilling equipment, and a hose filled with non-Newtonian fluid is placed in the ditch. The hose is then pressed by a heavy object so that the non-Newtonian fluid is close to the inner surface of the ditch. The non-Newtonian fluid in the hose absorbs the vibration generated during the drilling and grouting process, which is beneficial to the protection of ancient buildings.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. In the process of repairing the foundation of ancient buildings, the damaged foundation of ancient buildings is accurately located and repaired by layered compaction grouting, which improves the strength and anti-seepage performance of the soil, changes the physical and mechanical properties of the soil, and improves the bearing capacity of the soft soil foundation. The use of layered compaction grouting can save time for breaking the ground and help shorten the construction period.

[0025] 2. Mixing synthetic fibers into cement mortar is beneficial to improve the tensile strength of the cement material after solidification, making the cement material less likely to crack, thereby helping to prolong the maintenance time after foundation repair; synthetic fibers are flexible and less likely to affect grouting resistance, and synthetic fibers can deform to adapt to the tortuous cracks in the soil, allowing synthetic fibers to reach deeper soil cracks. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a flow chart of the non-destructive repair construction method of the ancient building foundation of Example 1.

[0027] Figure 2 It is a schematic diagram of the state of the shock-absorbing base supporting the drilling rig in Example 2.

[0028] Figure 3 This is a cross-sectional view of the vibration-damping base in Example 2.

[0029] Figure 4 This is a three-dimensional diagram of the shock absorbing base in Example 2.

[0030] Description of reference numerals: 1. Drilling rig; 2. Shock-absorbing base; 21. Receiving groove; 211. Waist-shaped hole; 22. Support seat; 23. Non-Newtonian fluid filler; 221. Conical plate; 222. Support plate; 223. Reinforcement plate; 224. Cylinder wall; 2241. Rubber sealing layer; 225. Positioning cylinder; 226. Screw; 227. Nut; 228. Spring washer; 3. Positioning anchor rod. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-4 This application is described in further detail.

[0032] Example 1 The present application embodiment discloses a non-destructive repair construction method for the foundation of an ancient building. Figure 1 The non-destructive repair construction method of the ancient building foundation includes the following steps: Step 1: Determine the construction area, conduct geological survey and measurement; monitor the ground subsidence in the ancient building area, as well as the tilt, displacement and cracks of the ancient buildings caused by ground subsidence; Step 2: Based on the ground settlement in the ancient building area, survey and stake out, use RTK surveying technology to arrange the hole positions, use a level to measure the ground elevation, and determine the depth of the lead hole; Step 3, drilling a hole using a drilling rig 1, the diameter and depth of the hole being determined according to the specific geological conditions and reinforcement requirements, and keeping records during the drilling process to provide reference data for the grouting operation; Step 4: Use high-pressure water to clean the hole to reduce the sediment and mud weight in the hole; connect the sleeve valve pipe according to the depth of the lead hole, close the lower end of the sleeve valve pipe with a pointed bottom, lower the sleeve valve pipe into the hole, and the upper end of the sleeve valve pipe is exposed 15-25cm above the ground; Step 5: Use a slurry pump to inject casing material between the sleeve valve tube and the hole wall. The casing material uses a slurry with a ratio of bentonite, cement and water of 2:1:9; use quick-setting cement mortar to seal the ground around the hole within a depth of 1m; Step 6, mixing and preparing grouting materials; the grouting materials can be cement mortar, polyurethane, polyacrylamide and epoxy resin, etc., and cement mortar is specifically selected in this embodiment; Step 7, pouring grouting; the grouting method adopts segmented grouting, that is, after each section of grouting is completed, the core tube length is moved upward by a step distance, the grouting step distance is 0.6-1m, and a section of the grouting core tube is removed after each grouting length of 3-4m is completed; the grouting process adopts multi-porous interval grouting.

[0033] The implementation principle of the non-destructive repair construction method of the foundation of an ancient building in the embodiment of the present application is as follows: in the process of repairing the foundation of the ancient building, the foundation of the ancient building with diseases is accurately located and repaired by layered compaction grouting. Cement slurry or chemical slurry is poured in with a higher pressure. During grouting, the slurry first fills the larger gaps and then penetrates into the pores of the soil under a greater pressure; as the soil is squeezed until shear cracks appear and splitting occurs, the slurry fills the cracks to form slurry veins, and further forms a new mesh skeleton structure in the soil. Since the slurry veins occupy a part of the space in the soil during the formation process, and the soil is compacted, a new slurry vein composite foundation is formed, which not only improves the strength and anti-seepage performance of the soil, but also changes the physical and mechanical properties of the soil, and improves the bearing capacity of the soft soil foundation. In the grouting process, porous interval grouting is adopted, which is conducive to reducing the excessive deformation of the soil during the grouting process and ensuring that the load can be evenly distributed, thereby helping to reduce the additional settlement of the existing building foundation caused by grouting, and then helping to ensure the quality of foundation reinforcement.

[0034] Example 3 Reference Figure 2-4 When drilling with the drilling rig 1, a plurality of shock-absorbing bases 2 for supporting the drilling rig 1 are arranged at the construction site. The shock-absorbing base 2 is a cubic structure as a whole. The shock-absorbing base 2 includes a receiving groove 21 and a support seat 22. The receiving groove 21 is provided with a non-Newtonian fluid filler 23. The non-Newtonian fluid filler 23 can be mud, ceramic slurry, water-coal slurry, pulp or starch slurry, etc. The support seat 22 is located inside the receiving groove 21, and the outer peripheral surface of the support seat 22 abuts against the inner peripheral surface of the receiving groove 21. When the drilling rig 1 is working, the non-Newtonian fluid can absorb the vibration of the drilling rig 1 during the working process, thereby reducing the impact of the vibration of the drilling process on the ancient building.

[0035] Reference Figure 3 The support seat 22 is a sheet metal structure, and the support seat 22 includes a conical plate 221 and a support plate 222. The peripheral edge of the support plate 222 is provided with a cylinder wall 224, and the outer peripheral surface of the cylinder wall 224 is provided with a rubber sealing layer 2241, and the rubber sealing layer 2241 is tightly matched with the inner peripheral surface of the accommodating groove 21; the conical plate 221 is located on the inner side of the cylinder wall 224, and the inner concave surface of the conical plate 221 is arranged downward, and the peripheral edge of the conical plate 221 is welded and fixed to the inner peripheral surface of the cylinder wall 224, and a plurality of mutually parallel reinforcing ribs 223 are provided between the conical plate 221 and the cylinder wall 224, and the reinforcing ribs 223 are welded and fixed to the upper surface of the conical plate 221.

[0036] Reference Figure 2 and Figure 3 The cylinder wall 224 is a square cylinder structure, and screws 226 are fixedly arranged on the four outer sides of the cylinder wall 224. The receiving groove 21 is provided with a waist-shaped hole 211 for the screw 226 to pass through. The length direction of the waist-shaped hole 211 is arranged vertically. The screw 226 is provided with a nut 227 and a spring washer 228. The nut 227 is threadedly connected with the screw 226, and the spring washer 228 is located between the nut 227 and the receiving groove 21. The nut 227 is locked with the screw 226, which can enhance the sealing effect between the cylinder wall 224 and the receiving groove 21.

[0037] Reference Figure 3 , positioning tubes 225 are respectively provided on both sides of the receiving groove 21, and the positioning tubes 225 are inserted with positioning anchor rods 3, the lower end of the positioning anchor rods 3 is a pointed end, and the outer peripheral surface of the positioning anchor rods 3 is provided with outwardly convex threads. When the positioning anchor rods 3 pass through the positioning tubes 225 and are inserted into the soil, the position of the shock absorbing base 2 can be kept stable.

[0038] A plurality of shock-absorbing bases 2 jointly support the drilling rig 1. When the drilling rig 1 needs to move, a new shock-absorbing base 2 is placed in front of the moving direction of the drilling rig 1. After the drilling rig 1 moves to the new shock-absorbing base 2, the drilling rig 1 moves away from one or more of the shock-absorbing bases 2, and then the shock-absorbing base 2 leaving the drilling rig 1 is moved to the front of the moving direction of the drilling rig 1, so that the drilling rig 1 can continue to move forward.

[0039] In the initial stage of the drilling rig 1 moving to the shock absorbing base 2, for a drilling rig with a driving function, a ramp structure can be set beside the shock absorbing base 2 to allow the drilling rig 1 to travel onto the shock absorbing base 2. For a drilling rig 1 without a driving function, a forklift can be used to transfer it from the ground to the shock absorbing base 2.

[0040] In order to further reduce the impact of drilling vibration on ancient buildings, for drilling and grouting in areas close to buildings or even on the ground inside ancient buildings, it is necessary to lay shock-absorbing fillers between the drilling equipment and the ancient buildings that need to be protected; when laying shock-absorbing fillers, first dig a ditch between the drilling equipment and the ancient buildings that need to be protected, then lay a braided hose at the bottom of the ditch, then pour non-Newtonian fluid into the hose, and tie and seal the two ends of the braided hose so that the braided hose covers the bottom of the ditch; then press a heavy object on the hose poured with non-Newtonian fluid, the heavy object can be a sandbag, cement bag or water bag, etc. The heavy object can make the hose close to the inner wall of the ditch, so that the non-Newtonian fluid in the hose can be used to further absorb the energy of vibration during the drilling process.

[0041] Example 2 The difference between this embodiment and embodiment 1 is that in this embodiment, when the grouting material is stirred and configured, synthetic fibers are mixed into the cement mortar, the diameter range of the synthetic fibers is: 0.2-0.5 mm, the length range is: 20 mm-60 mm, and the synthetic fibers mainly include polyethylene, polypropylene, polyvinyl alcohol, nylon, aromatic polyimide, etc. The synthetic fibers can be configured with different wire diameters and different length specifications.

[0042] Synthetic fibers are prepared by cutting continuous long fibers. During the process of cutting and preparing the synthetic fibers, rubber balls are added to the continuous long fibers at intervals. After the rubber balls solidify, they are formed on the continuous long fibers. The material of the rubber balls is a mixture of rubber and metal powder. After the rubber balls solidify, the long fibers are cut and processed into synthetic fibers with a weighted rubber ball bonded and fixed at one end.

[0043] In this embodiment, mixing synthetic fibers into cement mortar is beneficial to improving the tensile strength of the cement material after solidification, making the cement material less likely to crack, thereby helping to prolong the maintenance time after foundation repair; the weight of one end of the rubber ball where the synthetic fiber is set is relatively large, and when the synthetic fiber flows with the cement slurry, one end of the rubber ball can pull the synthetic fiber to flow, making the length direction of the synthetic fiber closer to the extension direction of the cement mortar vein, thereby helping the synthetic fiber to fully play its reinforcing role. Metal powder can increase the density, so that the rubber ball has a larger weight with a smaller density.

[0044] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A non-destructive repair construction method for ancient building foundation, characterized in that: The steps include: Monitor the ground subsidence in the ancient building area, as well as the tilt, displacement and cracks of the ancient buildings caused by ground subsidence; Combined with the ground subsidence in the ancient building area, survey and layout were carried out to arrange the holes; Drilling a hole using a drilling machine (1); Use high-pressure water to clean the hole; lower the sleeve valve pipe into the hole, with the upper end of the sleeve valve pipe exposed above the ground; Use quick-setting cement mortar to seal the ground around the hole within a depth of 1m; Mix and prepare grouting materials; Grouting grouting; the grouting method adopts segmented grouting, that is, after each segment of grouting is completed, the core tube length is moved up or down by a step distance; during the grouting process, multi-hole interval grouting is adopted.

2. The method for non-destructive repair of ancient building foundation according to claim 1 is characterized in that: When drilling a hole using a drilling rig (1), a shock-absorbing base (2) for supporting the drilling rig (1) is arranged at a construction site, the shock-absorbing base (2) comprising a receiving groove (21) and a support seat (22), a non-Newtonian fluid filler (23) being arranged in the receiving groove (21), the support seat (22) being located inside the receiving groove (21), a rubber sealing layer (2241) being arranged on the peripheral side of the support seat (22), the rubber sealing layer (2241) being in contact with the inner peripheral surface of the receiving groove (21).

3. The method for non-destructive repair of ancient building foundation according to claim 2 is characterized in that: The lower surface of the support seat (22) is an upwardly concave spherical surface, a conical surface or a pyramidal surface.

4. The method for non-destructive repair of ancient building foundation according to claim 3 is characterized in that: The support seat (22) is a sheet metal structure, comprising a conical plate (221) and a support plate (222); a cylindrical wall (224) is provided on the peripheral edge of the support plate (222); the conical plate (221) is located on the inner side of the cylindrical wall (224); the peripheral edge of the conical plate (221) is welded and fixed to the inner peripheral surface of the cylindrical wall (224); a plurality of reinforcing rib plates (223) are provided between the conical plate (221) and the cylindrical wall (224); and the rubber sealing layer (2241) is located on the outer peripheral surface of the cylindrical wall (224).

5. The method for non-destructive repair of ancient building foundation according to claim 2 is characterized in that: Positioning cylinders (225) are respectively provided on both sides of the containing groove (21), and positioning anchor rods (3) are inserted into the positioning cylinders (225), and the positioning anchor rods (3) are used to be inserted into the soil.

6. The method for non-destructive repair of ancient building foundation according to claim 2 is characterized in that: A plurality of shock-absorbing bases (2) are provided, and the plurality of shock-absorbing bases (2) jointly support the drilling rig (1); when the drilling rig (1) needs to move, a new shock-absorbing base (2) is placed in front of the moving direction of the drilling rig (1); after the drilling rig (1) moves to the new shock-absorbing base (2), the drilling rig (1) moves away from one or more of the shock-absorbing bases (2), and then the shock-absorbing base (2) that has left the drilling rig (1) is moved to the front of the moving direction of the drilling rig (1), so that the drilling rig (1) can continue to move forward.

7. The method for non-destructive repair of ancient building foundation according to claim 1 is characterized in that: For situations where drilling and grouting need to be carried out in areas close to buildings or even on the ground inside ancient buildings, before drilling, shock-absorbing fillers need to be laid between the drilling equipment and the ancient buildings that need to be protected; when laying the shock-absorbing fillers, first dig a ditch between the drilling equipment and the ancient buildings that need to be protected, then lay a braided hose at the bottom of the ditch, then pour non-Newtonian fluid into the hose, and tie and seal both ends of the braided hose so that the braided hose covers the bottom of the ditch; then put a heavy object on the hose filled with the non-Newtonian fluid.

8. The method for non-destructive repair of ancient building foundation according to claim 1 is characterized in that: The slurry to be stirred is cement mortar, in which synthetic fibers are mixed. The diameter range of the synthetic fibers is 0.2-0.5 mm, and the length range is 20 mm-60 mm.

9. The method for non-destructive repair of ancient building foundation according to claim 8, characterized in that: A weighted rubber ball is bonded and fixed to one end of the synthetic fiber, and the weighted rubber ball is a mixed material of rubber and metal powder.

10. The method for non-destructive repair of ancient building foundation according to claim 8, characterized in that: Synthetic fibers come in different diameters and different lengths.

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