Karst area foundation reinforcing and positioning device

Abstract

The utility model relates to the technical field of karst foundation reinforcement, and discloses a karst area foundation reinforcement positioning device which comprises a pile casing used for being inserted into a foundation and a positioning mechanism used for positioning and guiding the pile casing to be directionally inserted. The pile casings can be spliced and assembled so as to be inserted into underground karst caves with different depths; the positioning mechanism is installed on the ground and comprises an annular positioning plate, a plurality of positioning units distributed on the positioning plate in the circumferential direction and a supporting unit, and the positioning units are used for guiding the pile casing to be inserted into underground soil in the fixed direction. The pile casing provided by the utility model is inserted into the ground so as to conveniently inject slurry components for enhancing the strength of a foundation into an underground karst cave, on the other hand, a more accurate positioning and guiding effect can be achieved, and the pre-positioned karst cave can be conveniently and accurately found. The pile casings can be spliced and assembled to be inserted into underground karst caves with different depths, and therefore reinforcement grouting can be conducted on the deeper karst caves.

Description

A foundation fixing device for karst areas Technical Field

[0001] This utility model relates to the field of karst foundation reinforcement technology, and in particular to a foundation fixing device for karst areas. Background Technology

[0002] When constructing engineering projects in karst areas, the stability of the foundation is a key factor in ensuring project safety. The unique geological conditions of karst areas, such as the widespread distribution of caves and dissolution fissures, pose significant challenges to foundation treatment.

[0003] With the continuous advancement of infrastructure construction in my country, more and more projects are being carried out in karst areas. In these projects, traditional foundation treatment methods are insufficient to meet the requirements of modern engineering for foundation stability and bearing capacity. Therefore, reinforcing the foundations in karst areas is particularly important to ensure the safety and normal use of buildings.

[0004] Currently, in foundation reinforcement projects in karst areas, inserting casings and grouting is a common treatment method. The casings can extend into underground karst caves, providing a stable channel for grouting and thus enhancing the stability of the foundation. However, existing casings have many problems in practical applications.

[0005] On the one hand, the casing is difficult to position and prone to deviation when inserted into the ground, making it difficult to accurately insert it into the intended location. Due to the complex geological conditions in karst areas, the distribution and shape of underground caverns are irregular, making it impossible to accurately determine the position and orientation of the casing during insertion. If the casing is not inserted accurately, it will not only affect the grouting effect and reduce the quality of foundation reinforcement, but may even lead to safety hazards for the entire project. For example, in the construction of some high-rise buildings in karst areas, due to the positioning deviation of the casing, the grouting failed to effectively fill the caverns, resulting in uneven settlement of the foundation and affecting the structural safety of the building.

[0006] On the other hand, existing casings have shortcomings in assembly and welding, making operation inconvenient. On construction sites, the assembly and welding of casings is typically cumbersome, requiring significant time and manpower. Furthermore, welding quality is difficult to guarantee, easily leading to problems such as weak welds and weld cracks. This not only affects the overall strength and stability of the casing but may also cause grout leakage during grouting, reducing the grouting effect. For example, in some large bridge foundation reinforcement projects, grout leakage occurred during grouting due to casing assembly and welding quality issues, necessitating a halt to construction for repairs, delaying the project and increasing costs.

[0007] In summary, the existing casings used for foundation reinforcement in karst areas suffer from problems in positioning and assembly / welding, which seriously affect the quality, schedule, and cost of foundation reinforcement projects in karst areas. Therefore, developing a foundation reinforcement fixing device for karst areas that can be accurately inserted and positioned and easily assembled / welded is of significant practical importance. Summary of the Invention

[0008] To address the technical problems mentioned in the background section, this utility model provides a foundation fixing device for karst areas.

[0009] This utility model is achieved using the following technical solution: a foundation fixing device for karst areas, comprising a casing for insertion into the foundation and a positioning mechanism for guiding the directional insertion of the casing. The casing is inserted underground to facilitate the injection of grout components that enhance the foundation strength into underground karst caves, and also to provide more accurate positioning and guidance, facilitating the precise location of pre-positioned karst caves.

[0010] The casings can be spliced ​​and assembled to be inserted into underground karst caves at different depths, thus enabling reinforcement grouting into deeper karst caves.

[0011] The positioning mechanism is installed on the ground and includes a ring-shaped positioning plate, several positioning units distributed circumferentially on the positioning plate, and a support unit. The positioning unit is used to guide the casing to be inserted into the underground soil along a fixed direction.

[0012] The positioning unit includes a mounting block mounted on the positioning plate, a guide rod connected to the mounting block, a bracket fixed to one end of the guide rod, and a rolling element mounted on the bracket. Before inserting the protective sleeve, the rolling element is adjusted by adjusting each positioning unit so that it contacts the outer wall of the protective sleeve, thereby effectively preventing the protective sleeve from shifting when it is inserted.

[0013] Optionally, the casing is a cylindrical structure, with an annular contraction groove on one outer wall and an annular flaring groove on the other inner wall. Multiple casings with the aforementioned contraction groove and flaring groove can be connected end to end for fixation.

[0014] Optionally, the rolling element is a circular guide wheel, the wheel surface of which is used to contact the outer wall of the casing.

[0015] Optionally, the mounting block has a guide hole radially along the positioning plate, and the inner wall of the guide hole has a guide groove axially. The outer wall of the guide rod has a guide protrusion that slides with the guide groove. The top of the mounting block has a positioning hole communicating with the guide hole, and a positioning bolt is screwed into the positioning hole. The bottom end of the positioning bolt is used to press the guide rod to fix its position. The surface of the guide rod can be provided with positioning holes that mate with the positioning bolt, so that by adjusting the position of the guide rod, this positioning unit can be used to position protective cylinders of different diameters.

[0016] Optionally, the mounting block and the positioning plate are rotatably connected, and a clamping block is fixed at the other end of the guide rod. One side of the outer wall of the clamping block is used to fit against the outer wall of the protective cylinder. When the outer walls of the clamping blocks on each guide rod are tightly fitted against the protective cylinder, the static friction between the two can drive the protective cylinder to rise and fall above the ground.

[0017] The above structure allows for effective fixation of the casing when connecting the next casing above the one already inserted into the ground, enabling welding of the joint without the need for manual support.

[0018] Optionally, the positioning plate has circumferentially distributed connecting holes corresponding to the mounting blocks in the positioning unit. The mounting block has a connecting shaft that is rotatably connected to the connecting holes. A movable sleeve is screwed onto the connecting shaft. The bottom surface of the movable sleeve is used to contact the top surface of the positioning plate to fix the position of the mounting block.

[0019] Optionally, a protective pad, which is a rubber pad, is fixed to the outer wall of the clamping block.

[0020] Optionally, the support unit includes a support column fixed to the bottom surface of the positioning plate.

[0021] Specifically, the support column has an installation groove, in which a lifting component is installed. The output end of the lifting component is connected to a support leg, and the end of the support leg is equipped with a caster wheel. The lifting mechanism can drive the support leg and caster wheel to retract or extend out of the installation groove.

[0022] The above structure allows for easy movement or positioning of the entire device on the ground, making it more convenient to use.

[0023] Optionally, the lifting component can be an electric push rod or a hydraulic cylinder.

[0024] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0025] The present invention proposes a foundation fixing device for karst areas, which includes a casing for insertion into the foundation and a positioning mechanism for guiding the directional insertion of the casing. Inserting the casing underground facilitates the injection of grout components that enhance the foundation strength into underground karst caves, and also provides more accurate positioning guidance, making it easier to precisely locate pre-positioned karst caves.

[0026] Furthermore, the casings proposed in this invention can be spliced ​​and assembled to be inserted into underground karst caves of different depths, thereby enabling reinforcement grouting into deeper karst caves. Attached Figure Description

[0027] Figure 1 is a three-dimensional view of the overall structure of this utility model;

[0028] Figure 2 is a top view of the overall structure of this utility model;

[0029] Figure 3 is an enlarged view of a partial structure in Figure 1 of this utility model;

[0030] Figure 4 is a cross-sectional view of section AA in Figure 2 of this utility model.

[0031] Explanation of key symbols:

[0032] In the diagram: 1. Casing; 101. Shrinkage groove; 102. Flaring groove; 2. Positioning plate; 3. Support column; 4. Lifting component; 5. Support leg; 6. Mounting block; 7. Clamping block; 8. Protective pad; 9. Positioning bolt; 10. Guide rod; 11. Guide ridge; 13. Movable sleeve; 14. Connecting hole; 15. Bracket; 16. Guide wheel; 17. Mounting groove. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0034] Example 1:

[0035] Referring to Figures 1-4, this solution proposes a foundation fixing device for karst areas, including a casing 1 for insertion into the foundation and a positioning mechanism for guiding the directional insertion of the casing 1. Inserting the casing underground facilitates the injection of grout components that enhance the foundation strength into underground karst caves, and also provides more accurate positioning guidance, making it easier to precisely locate pre-positioned karst caves.

[0036] The casings 1 can be spliced ​​and assembled to be inserted into underground karst caves of different depths, thereby enabling reinforcement grouting into deeper karst caves.

[0037] In this scheme, the positioning mechanism is installed on the ground. The positioning mechanism includes an annular positioning plate 2, several positioning units distributed circumferentially on the positioning plate 2, and a support unit. The positioning unit is used to guide the casing 1 to be inserted into the underground soil along a fixed direction.

[0038] The positioning unit includes a mounting block 6 mounted on the positioning plate 2, a guide rod 10 connected to the mounting block 6, a bracket 15 fixed to one end of the guide rod 10, and a rolling element mounted on the bracket 15. Before inserting the protective sleeve, the rolling element is made to contact the outer wall of the protective sleeve 1 by adjusting each positioning unit, thereby effectively preventing the protective sleeve from shifting when it is inserted.

[0039] In specific implementation, the protective sleeve 1 is a cylindrical structure, and the diameter is selected according to the actual situation. The material of the protective sleeve is stainless steel or other high-strength metal products. One side of the outer wall of the protective sleeve 1 has an annular shrinkage groove 101, and the other side of the inner wall of the protective sleeve 1 has an annular flaring groove 102. Multiple protective sleeves 1 with the above-mentioned shrinkage groove 101 and flaring groove 102 can be connected end to end for fixation.

[0040] In this design, the rolling element is a circular guide wheel 16, and the wheel surface of the guide wheel 16 is used to contact the outer wall of the casing 1.

[0041] It should be noted that the mounting block 6 has a guide hole radially along the positioning plate 2, and the inner wall of the guide hole has a guide groove axially. The outer wall of the guide rod 10 has a guide protrusion 11 that slides with the guide groove. The top of the mounting block 6 has a positioning hole communicating with the guide hole, and a positioning bolt 9 is screwed into the positioning hole. The bottom end of the positioning bolt 9 is used to press the guide rod 10 to fix the position of the guide rod 10. The surface of the guide rod 10 can be provided with positioning holes that cooperate with the positioning bolts. In this way, by adjusting the position of the guide rod 10, this positioning unit can be used to position protective cylinders of different diameters.

[0042] Furthermore, the mounting block 6 and the positioning plate 2 are rotatably connected, and the other end of the guide rod 10 is fixed with a clamping block 7. One side of the outer wall of the clamping block 7 is used to fit against the outer wall of the protective cylinder 1. When the outer walls of the clamping blocks 7 on each guide rod 10 are tightly fitted against the protective cylinder 1, the static friction between the two can drive the protective cylinder 1 to rise and fall above the ground.

[0043] This structure allows for effective fixation of the casing when connecting the next casing above the one already inserted into the ground, enabling welding of the joint without the need for manual support.

[0044] As an optional implementation of this scheme, the positioning plate 2 has circumferentially distributed connecting holes 14 corresponding to the mounting block 6 in the positioning unit. The mounting block 6 is fixed with a connecting shaft that is rotatably connected to the connecting holes 14. A movable sleeve 13 is screwed onto the connecting shaft. The bottom surface of the movable sleeve 13 is used to contact the top surface of the positioning plate 2 to fix the position of the mounting block 6.

[0045] In this design, a protective pad 8 is fixed to the outer wall of the clamping block 7. The protective pad 8 is a rubber pad.

[0046] Optionally, the support unit includes a support column 3 fixed to the bottom surface of the positioning plate 2.

[0047] Specifically, the support column 3 is provided with an installation groove 17, and a lifting component 4 is installed in the installation groove 17. Optionally, the lifting component 4 is an electric push rod or a hydraulic cylinder.

[0048] The output end of the lifting component 4 is connected to the support leg 5, and the end of the support leg 5 is equipped with a caster wheel. The lifting component 4 can drive the support leg 5 and the caster wheel to be stored or extended from the mounting slot 17.

[0049] With its adjustable outriggers and casters, the device can be easily moved or positioned on the ground, making it more convenient to use.

[0050] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A foundation fixing device for karst areas, characterized in that, The system includes a casing for insertion into the foundation and a positioning mechanism for guiding the directional insertion of the casing. The casings can be spliced ​​and assembled to be inserted into underground karst caves at different depths. The positioning mechanism is installed on the ground and includes an annular positioning plate, several positioning units circumferentially distributed on the positioning plate, and a support unit. The positioning unit is used to guide the casing to be inserted into the underground soil along a fixed direction. The positioning unit includes a mounting block installed on the positioning plate, a guide rod connected to the mounting block, a bracket fixed to one end of the guide rod, and a rolling element installed on the bracket. The rolling element is used to contact the outer wall of the casing.

2. The foundation fixing device for karst areas as described in claim 1, characterized in that, The protective sleeve is a cylindrical structure. One outer wall of the protective sleeve has an annular shrinkage groove, and the other inner wall of the protective sleeve has an annular flaring groove. Multiple protective sleeves with the shrinkage groove and flaring groove can be connected end to end for fixation.

3. A foundation fixing device for karst areas as described in claim 2, characterized in that, The rolling element is a circular guide wheel, and the wheel surface of the guide wheel is used to contact the outer wall of the protective cylinder.

4. A foundation fixing device for karst areas as described in claim 3, characterized in that, The mounting block has a guide hole along the radial direction of the positioning plate. The inner wall of the guide hole has a guide groove along its axial direction. The outer wall of the guide rod has a guide protrusion that slides with the guide groove. The top of the mounting block has a positioning hole that communicates with the guide hole. A positioning bolt is screwed into the positioning hole. The bottom end of the positioning bolt is used to press the guide rod to fix the position of the guide rod.

5. A foundation fixing device for karst areas as described in claim 1, characterized in that, The mounting block and the positioning plate are rotatably connected, and a clamping block is fixed at the other end of the guide rod. One side of the outer wall of the clamping block is used to fit against the outer wall of the protective cylinder. When the outer walls of the clamping blocks on each guide rod are tightly fitted against the protective cylinder, the static friction between the two can drive the protective cylinder to rise and fall above the ground.

6. A foundation fixing device for karst areas as described in claim 4, characterized in that, The positioning plate has circumferentially distributed connecting holes corresponding to the mounting blocks in the positioning unit. The mounting block has a connecting shaft that is rotatably connected to the connecting holes. A movable sleeve is screwed onto the connecting shaft. The bottom surface of the movable sleeve is used to contact the top surface of the positioning plate to fix the position of the mounting block.

7. A foundation fixing device for karst areas as described in claim 5, characterized in that, The outer wall of the clamping block is fixed with a protective pad, which is a rubber pad.

8. A foundation fixing device for karst areas as described in claim 1, characterized in that, The support unit includes a support column fixed to the bottom surface of the positioning plate.

9. A foundation fixing device for karst areas as described in claim 8, characterized in that, The support column is provided with an installation groove, in which a lifting component is installed. The output end of the lifting component is connected to a support leg, and the end of the support leg is equipped with a caster wheel. The lifting mechanism can drive the support leg and caster wheel to retract or extend out of the installation groove.

10. A foundation fixing device for karst areas as described in claim 9, characterized in that, The lifting component is an electric push rod or a hydraulic cylinder.

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