Existing building foundation reinforcing structure
By drilling and grouting on the building foundation, the problem of insufficient bearing capacity and seismic resistance of the existing building foundation is solved, and the effect of improving the foundation's compressive bearing capacity and seismic resistance of the same time is convenient and low cost.
Patent Information
- Application Number
- CN202421402253.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-18
- Publication Date
- 2025-05-06
- Estimated Expiration
- 2034-06-18
AI Technical Summary
The foundation bearing capacity and seismic resistance of existing buildings are poor, and there are safety hazards.
By drilling downwards on the building foundation to form a plurality of pile holes, injecting reinforcement materials into the pile holes to form reinforcement piles. The cross-sectional size of the pile holes is smaller than the cross-sectional size of the reinforcement piles, and the inclination angle between the pile holes and the horizontal plane is 30° to 90°. The inclination arrangement directions of the adjacent two rows of pile holes are opposite, and partially arranged overlapping, and reinforcement is inserted into the reinforcement piles.
Without destroying the original foundation, the pressure bearing capacity and seismic resistance of the building are improved, with simple construction, short construction period and low cost.
Smart Images
Figure CN222834947U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of foundation reinforcement construction, in particular to a foundation reinforcement structure of an existing building. Background Art
[0002] Many buildings in cities are gradually entering the "middle age" or "old age", and the bearing capacity of many existing foundations can no longer meet people's use needs. During earthquakes, buildings with poor structural bearing capacity and seismic performance threaten people's lives and property safety. Utility Model Content
[0003] The purpose of the utility model is to overcome the defects of the prior art, provide a foundation reinforcement structure for an existing building, and solve the problem that the foundation bearing capacity and earthquake resistance of the existing buildings are poor.
[0004] The technical solution to achieve the above purpose is:
[0005] The utility model provides a foundation reinforcement structure for an existing building, comprising:
[0006] A pile hole is formed by drilling downward on the foundation of an existing building, wherein the pile holes are provided in plurality and arranged at intervals on the foundation;
[0007] A reinforcement pile is formed by injecting reinforcement material into the pile hole, and the cross-sectional size of the reinforcement pile is larger than the cross-sectional size of the pile hole.
[0008] A further improvement of the existing building foundation reinforcement structure of the utility model is that the inclination angle between the pile hole and the horizontal plane is between 30° and 90°.
[0009] A further improvement of the existing building foundation reinforcement structure of the utility model is that the pile holes are arranged in an inclined shape, and the inclined directions of the pile holes in two adjacent rows are opposite.
[0010] A further improvement of the existing building foundation reinforcement structure of the utility model is that the pile holes are also arranged on the outside of the wall of the existing building.
[0011] A further improvement of the existing building foundation reinforcement structure of the utility model is that the bottom elevation of the pile hole is more than 1 meter lower than the bottom elevation of the cushion layer under the foundation.
[0012] A further improvement of the existing building foundation reinforcement structure of the utility model is that two adjacent reinforcement piles are partially overlapped.
[0013] A further improvement of the existing building foundation reinforcement structure of the utility model is that a reinforcement body is provided on the foundation corresponding to the root of the wall of the existing building, and the side surface of the reinforcement body is an inclined surface.
[0014] The utility model is a further improvement on the existing building foundation reinforcement structure in that it also includes a reinforcement member inserted into the reinforcement pile.
[0015] The beneficial effects of the existing building foundation reinforcement structure of the utility model are:
[0016] The utility model realizes that, without damaging the original foundation, the existing building can be reinforced by grouting downward through the construction pile holes to form reinforcement piles, thereby improving the compressive bearing capacity and earthquake resistance of the foundation, and has a simple structure and convenient construction. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a plan view of the existing building foundation reinforcement structure of the utility model.
[0018] Figure 2 It is a schematic diagram of the node structure of the existing building foundation reinforcement structure at the root of the wall according to the utility model. DETAILED DESCRIPTION
[0019] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.
[0020] See also Figure 1 The utility model provides a foundation reinforcement structure for an existing building, which is used to solve the problem that the existing foundation structure of the existing building has poor bearing capacity and seismic performance. The reinforcement structure of the utility model can reinforce the foundation without destroying the existing building, and has the advantages of short construction period, convenient construction and low cost. The utility model foundation reinforcement structure for an existing building is described below in conjunction with the accompanying drawings.
[0021] See also Figure 1 , showing a schematic plan view of the existing building foundation reinforcement structure of the utility model. Figure 2 , showing the schematic diagram of the node structure of the existing building foundation reinforcement structure at the root of the wall. Figure 1 and Figure 2 , the existing building foundation reinforcement structure of the utility model is described.
[0022] like Figure 1 and Figure 2 As shown, the existing building foundation reinforcement structure of the utility model includes a pile hole 21 and a reinforcement pile 22, wherein there are multiple pile holes 21, which are formed by drilling downward on the foundation 11 of the existing building, and the pile holes 21 are arranged on the foundation 11 at intervals; the reinforcement pile 22 is formed by injecting reinforcement material into the pile hole 21, and the cross-sectional size of the reinforcement pile 22 is larger than the cross-sectional size of the pile hole 21.
[0023] The reinforcement material injected into the pile hole 21 is concrete with a strength grade of C40. After the concrete is injected into the pile hole 21, the injected concrete will penetrate into the soil outside the pile hole 21, so that the size of the formed reinforced pile 22 is larger than the size of the pile hole 21. Preferably, when injecting the reinforcement material into the pile hole 21, the grouting pressure is selected to be 0.4-0.6MPa. If the concrete does not sink within 10-15 minutes after injection, the grouting can be stopped. The effective grouting area 211 of a single pile hole 21 is 1000mm.
[0024] In a specific implementation of the present invention, the inclination angle between the pile hole 21 and the horizontal plane is between 30° and 90°.
[0025] Furthermore, the pile holes 21 are arranged in an inclined shape, and the inclined directions of the pile holes 21 in two adjacent rows are opposite. The opposite inclined directions can increase the reinforcement area of the foundation.
[0026] In a specific implementation of the present invention, the pile holes 21 are also arranged outside the wall 13 of the existing building.
[0027] The utility model not only reinforces the bottom of the foundation inside the building, but also reinforces the soil outside the wall 13 . Preferably, three rows of pile holes 21 are arranged outside the wall 13 .
[0028] Furthermore, the bottom elevation of the pile hole 21 is more than 1 meter lower than the bottom elevation of the cushion layer 12 under the foundation 11. That is, the pile hole 21 is driven into the soil below the foundation 11 to a depth of at least 1 meter.
[0029] In a specific implementation of the present invention, two adjacent reinforcement piles 22 are partially overlapped.
[0030] The hole spacing of the pile holes 21 is 1000 mm, which is determined based on the effective area of the pile hole grouting.
[0031] In a specific embodiment of the present invention, Figure 2 As shown, a reinforcement body 23 is provided on the foundation 11 at the root of the wall 13 of the existing building, and the side of the reinforcement body 23 is an inclined surface. The reinforcement body 23 is provided between the foundation 11 and the wall 13, and the outer contour of the reinforcement body 23 is a trapezoid.
[0032] Before constructing the pile hole 21 , the reinforcement body 23 is constructed first. After the strength of the reinforcement body 23 reaches the required level, the pile hole 21 is constructed on the reinforcement body 23 .
[0033] In a specific implementation of the present invention, a reinforcement piece inserted into the reinforcement pile 21 is also included.
[0034] After the reinforcing material is injected into the pile hole, the reinforcing member is inserted into the pile hole. The reinforcing member is preferably a steel bar or an anchor rod.
[0035] The cushion layer 12 in the present invention has a thickness of 120 mm and a strength grade of C20, the foundation 11 has a thickness of 600 mm and a strength grade of C40, and the wall 13 has a strength grade of C40.
[0036] The diameter of the pile hole 21 is selected to be 2-3 mm larger than the diameter of the grouting pipe. For example, if the diameter of the grouting pipe is 25 mm, the diameter of the pile hole 21 is 27-28 mm.
[0037] The construction process of the existing building foundation reinforcement structure of the utility model is described below.
[0038] When reinforcing the foundation of an existing building, a reinforcement body is constructed between the foundation and the root of the wall to achieve the reinforcement of the wall. Then the location of the pile hole is distributed and designed according to the size of the foundation, the diameter of the pile hole is selected according to the size of the grouting pipe, and the depth of the pile hole is selected according to the required reinforcement strength.
[0039] Then, a drilling machine is used to drill downwards on the surface of the foundation to form a pile hole, and then a grouting pipe is inserted into the pile hole. The reinforcing material is injected into the pile hole through the grouting pipe. The injected reinforcing material is concrete with a strength grade of C40, and the grouting pressure is 0.4-0.6MPa. After the concrete is injected, the grouting can be stopped when the concrete on the surface of the pile hole no longer sinks within 10-15 minutes, and then the reinforcement piece is inserted into the pile hole. The effective area of the single-hole grouting is larger than the area of the pile hole, which plays a role in forming an overall combined force.
[0040] The utility model is described in detail above in conjunction with the embodiments of the drawings. A person skilled in the art can make various variations of the utility model according to the above description. Therefore, some details in the embodiments should not constitute a limitation of the utility model, and the scope of protection of the utility model shall be defined by the scope of the attached claims.
Claims
1. A foundation reinforcement structure for an existing building, characterized in that: include: A pile hole is formed by drilling downward on the foundation of an existing building, wherein the pile holes are provided in plurality and arranged at intervals on the foundation; A reinforcement pile is formed by injecting reinforcement material into the pile hole, and the cross-sectional size of the reinforcement pile is larger than the cross-sectional size of the pile hole.
2. The existing building foundation reinforcement structure according to claim 1, characterized in that: The inclination angle between the pile hole and the horizontal plane is between 30° and 90°.
3. The existing building foundation reinforcement structure according to claim 1, characterized in that: The pile holes are arranged in an inclined shape, and the inclined directions of the pile holes in two adjacent rows are opposite.
4. The existing building foundation reinforcement structure according to claim 1, characterized in that: The pile holes are also arranged on the outside of the wall of the existing building.
5. The existing building foundation reinforcement structure according to claim 1, characterized in that: The bottom elevation of the pile hole is more than 1 meter lower than the bottom elevation of the cushion layer under the foundation.
6. The existing building foundation reinforcement structure according to claim 1, characterized in that: Two adjacent reinforcement piles are arranged to overlap partially.
7. The existing building foundation reinforcement structure according to claim 1, characterized in that: A reinforcement body is provided on the foundation corresponding to the root of the wall of the existing building, and the side surface of the reinforcement body is an inclined surface.
8. The existing building foundation reinforcement structure according to claim 1, characterized in that: It also includes a reinforcement piece inserted into the reinforcement pile.