Building foundation reinforcing and supporting structure

Abstract

The utility model discloses a building foundation reinforcing and supporting structure which comprises a prefabricated pile foundation and further comprises a grouting pipe, the grouting pipe comprises a grouting opening, the grouting opening is provided with an elastic sealing belt used for isolating soil, and the sealing belt expands towards the interior of a soil layer to form a bag shape after grouting. The grouting opening and the elastic sealing belt matched with the grouting opening are arranged on the side wall of the pile foundation, and the sealing belt can prevent the soil body from blocking the grouting opening in the process that the precast pile foundation is pressed into the soil body; during pressurized grouting, the sealing belt expands to form a bag shape around the pile, so that the contact area with a soil body is increased, the bearing capacity of a pile foundation is improved, meanwhile, the extrusion of a soil layer is enhanced, and the soil body is further compacted.

Description

Technical Field

[0001] The utility model relates to a building foundation reinforcement support structure. Background Art

[0002] The foundation strength is the resistance of the foundation when bearing the load of the building. It is one of the important indicators to measure the performance of the foundation. Foundation settlement is a common hidden danger in construction projects. This vertical displacement has an adverse effect on the safety of the building structure. Pile foundation reinforcement method is a method of improving the foundation strength by driving pile foundations into soil layers with insufficient bearing capacity. There are many types of pile foundations used to improve the bearing capacity of the foundation. The bearing capacity of different pile lengths and pile diameters is also different. For different foundations, specific designs need to be made in combination with local geological conditions, and the bearing capacity and economic efficiency of the project must be fully considered. With the continuous progress in the field of foundation reinforcement over the years, the foundation reinforcement foundation has made great progress, and there are many methods for foundation reinforcement. For example, the publication number CN214401864U proposes a reinforcement structure for composite foundation piles. Due to economic and construction period considerations, in general, the settlement within the design target still exists, so it is still necessary to further improve the bearing capacity of the foundation. Summary of the invention

[0003] The purpose of the utility model is to provide a reinforcement support structure of a building foundation with better bearing capacity.

[0004] To this end, the utility model provides a building foundation reinforcement support structure, including a prefabricated pile foundation and a grouting pipe. The grouting pipe includes a grouting port, and the grouting port is provided with an elastic sealing belt for isolating soil. After grouting, the sealing belt expands into the soil layer to form a bag shape.

[0005] Furthermore, the grouting pipe is arranged in the middle of the pile foundation, the grouting pipe is connected to the transverse pipe, the transverse pipe is provided with a grouting port on the side wall of the pile foundation, the grouting pipe is provided with a grouting port at the bottom of the pile foundation, and the grouting port is connected to the rubber sealing belt.

[0006] The grouting pipe can also be longitudinally pre-buried on one side of the pile foundation close to the side wall. The side wall of the pile foundation is provided with an annular groove, an annular pipe is arranged in the annular groove, the annular pipe is connected to the longitudinal grouting pipe, a plurality of grouting ports are arranged on the annular pipe, and a sealing belt is arranged on the annular groove.

[0007] Furthermore, the pile foundation is a special-shaped pile, and the pile foundation is symmetrically provided with a plurality of longitudinal grooves, the longitudinal grouting pipes are longitudinally arranged in the grooves, and a sealing belt is provided on the outer side of the longitudinal grooves.

[0008] Furthermore, the annular grooves are arranged at equal intervals, and the grouting ports are arranged at equal intervals on the annular tube.

[0009] A spiral groove may also be preformed on the outer wall of the pile foundation, a grouting pipe is buried in the groove, grouting holes are arranged at equal intervals on the grouting pipe, and a sealing belt is arranged on the outer side of the groove.

[0010] Furthermore, the pile foundation is also provided with a connection portion fixed to an adjacent pile foundation, the connection portion comprising: a first connection end and a second connection end, the first connection end being provided with a step surface on the upper end surface of one of the pile foundations, a connecting strip being pre-embedded below the step surface, and the steel bars of the pile foundation extending to the outer side of the upper end surface of the pile foundation; the second connection end being provided with a step surface on the lower end surface of the other pile foundation, a connecting strip being pre-embedded above the step surface, the steel bars extending to the outer side of the lower end surface of the pile foundation and being suitable for being connected to the steel bars of the corresponding upper end surface through a threaded pipe; a connecting ring, connecting strips for connecting to the first connection end and the second connection end being provided on both sides of the connecting ring, and the connecting ring cooperates with the end head of the pile foundation.

[0011] Furthermore, the pile foundation is also provided with a grouting pipe for injecting grout into the connection portion to fix the end of the pile foundation and the connection ring to form a whole.

[0012] Furthermore, a pedestal is provided above the pile foundation, a threaded connector is pre-embedded on the pedestal, adjacent pile foundations are connected by a connecting beam, the connecting beam and the pedestal are connected by high-strength bolts, a concrete slab is laid above the pedestal and the connecting beam, a sand and gravel cushion layer is laid above the concrete slab, and a concrete layer is poured above the cushion layer.

[0013] The beneficial technical effects of the utility model are:

[0014] (1) The utility model provides a grouting port and an elastic sealing belt matched with the grouting port on the side wall of the pile foundation. The sealing belt can prevent the soil from blocking the grouting port during the process of pressing the prefabricated pile foundation into the soil. During pressurized grouting, the sealing belt expands to form a bag around the pile, increasing the contact area with the soil, improving the bearing capacity of the pile foundation, and strengthening the squeezing of the soil layer to further compact the soil. The sealing belt can also prevent the water in the soil layer from mixing with the slurry, so that the effect of grouting is guaranteed and improved.

[0015] (2) In a specific embodiment of the present invention, protruding annular grouting bodies and a spiral post-grouting structure with equal intervals are formed on the side wall of the pile foundation, which can better reinforce the foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of a specific embodiment of a foundation reinforcement support structure for realizing the utility model;

[0017] Figure 2 is a schematic diagram of Example 1;

[0018] Figure 3 is a top view schematic diagram of Example 2;

[0019] Figure 4 It is a partial side view schematic diagram of Example 2 (the sealing belt is not shown);

[0020] Figure 5 It is a partial side view schematic diagram of Example 3 (the sealing belt is not shown);

[0021] Figure 6 It is a schematic diagram of connecting pile foundations through connecting parts according to the utility model;

[0022] Figure 7 Schematic diagram of the setting of sealing belt and grouting port.

[0023] Explanation of the reference numerals in the accompanying drawings: 1. pile foundation; 2. grouting pipe; 3. grouting port; 4. sealing tape; 5. transverse pipe; 6. pad; 7. wooden pad; 8. rib; 9. annular groove; 10. groove; 11. cap; 12. connector; 13. concrete slab; 14. connecting beam; 15. first connecting section; 16. second connecting end; 17. connecting ring; 18. connecting strip; 20. steel bar; 21. threaded pipe; 22. window; 23. step surface; 24. formwork; 25. annular pipe; 26. gravel cushion layer. DETAILED DESCRIPTION

[0024] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0025] Reference Figures 1 to 5 As shown, a building foundation reinforcement support structure of the utility model comprises a prefabricated pile foundation 1, the prefabricated pile foundation 1 comprises a grouting pipe 2, the grouting pipe 2 comprises a grouting port 3, the grouting port 3 is provided with an elastic sealing belt 4 for isolating the soil, and the sealing belt 4 expands into the soil layer to form a bag shape after grouting. The pile foundation 1 is prefabricated in a factory, and the grouting assembly comprises a grouting pipe 2 and a grouting port 3. Figure 2 As shown, in the embodiment 1 of the utility model, the grouting pipe 2 is arranged in the middle of the pile foundation 1, the grouting pipe 2 is connected to the transverse pipe 5, the transverse pipe 5 is provided with a grouting port 3 on the side wall of the pile foundation 1, and the grouting pipe 2 can also be provided with a grouting port at the bottom of the pile foundation 1 and connected to a rubber sealing belt on the outside. The grouting assembly can be fixed with the steel cage of the prefabricated pile foundation 1 and then placed in the mold, and can be fixed with the steel cage by tying, refer to Figure 7As shown, a sealing belt 4 is provided at the position of the grouting port 3 of the transverse pipe 5, and the grouting port 3 is against the surface of the sealing belt 4. A rigid pipe can be used for the grouting port 3. The position of the grouting port 3 can be fixed in a wooden pad 7. The wooden pad 7 can be fixed with a rib 8 or a steel bar clip fixed to the steel cage. The wooden pad 7 is against one side surface of the sealing belt 4. An inwardly protruding template 24 is provided and is against the other side surface of the middle of the sealing belt 4. The two ends of the sealing belt 4 are fixed to the template at a distance of one end through a pad 6. The sealing belt 4 can be formed by processing rubber material, and after pouring, the two ends of the sealing belt 4 are fixed in the pile foundation 1. After the prefabricated pile foundation 1 is poured, it is transported to the construction site and pressed into the foundation soil layer by a static press. The prefabricated pile foundation 1 is processed in a factory and standardized manner, with stable quality and convenient construction. After the prefabricated pile foundation 1 is pressed into the ground, pressurized grouting is performed through the grouting pipe 2. Refer to Figure 2 As shown, the sealing belt 4 expands outward under pressure to form a bag shape, which increases the contact surface between the pile foundation 1 and the soil layer, increases the lateral friction resistance of the pile, and improves the bearing capacity. The pile foundation 1 is generally used in situations where the bearing capacity of the foundation is insufficient, such as a soft soil layer, and the soft soil layer has a certain moisture content. After the pile foundation 1 is pressed into the soil layer, it will compact the soil layer to a certain extent, increase the bearing capacity of the soil layer, and also cause some groundwater to be squeezed out. Direct grouting is easily affected by groundwater, resulting in unstable bonding effect between the soil layer and the slurry after grouting, or the groundwater needs to be discharged before grouting. However, this embodiment uses a sealing belt 4 to isolate the grouting port 3 from the soil layer, and directly performs grouting without being affected by groundwater, thereby improving the bearing capacity of the pile foundation 1.

[0026] Reference Figure 3 and Figure 4 As shown, in the embodiment 2 of the utility model, the grouting pipe 2 is longitudinally pre-buried on one side of the prefabricated pile foundation 1 close to the side wall, an annular groove 9 is provided on the side wall of the pile foundation 1, an annular pipe 25 is arranged in the annular groove 9, the annular pipe 25 is connected to the longitudinal grouting pipe 2, a plurality of grouting ports 3 are arranged on the annular pipe 25, and a sealing belt 4 is arranged on the annular groove 9. The grouting pipe 2 of embodiment 2 is pre-buried inside the outer wall of the prefabricated pile foundation 1, the grouting pipe 2, the annular pipe 25 and the sealing belt 4 can be cast together with the prefabricated pile foundation 1, and a pre-processed annular metal box can be used as the annular groove 9. Preferably, the prefabricated pile foundation 1 can adopt a special-shaped pile, the pile foundation 1 is symmetrically provided with a plurality of longitudinal grooves 10, the grouting pipe is arranged in the groove 10, the special-shaped pile foundation 1 can increase the contact area with the soil layer, and increase the lateral friction resistance of the pile foundation 1, the grouting pipe 2 is longitudinally arranged in the groove 10, and a sealing belt 4 is arranged outside the longitudinal groove 10, and the groove 10 can adopt a prefabricated steel box and be cast together with the main body of the pile foundation 1. Preferably, the annular grooves 9 are arranged at equal intervals, and the grouting ports 3 are arranged at equal intervals on the annular tube.

[0027] Reference Figure 5As shown, in Example 3 of the utility model, a spiral groove 10 is preformed on the outer wall of the pile foundation 1, a grouting pipe 2 is buried in the groove 10, grouting holes are arranged at equal intervals on the grouting pipe 2, and a sealing belt 4 is arranged on the outer side of the groove 10. In this Example 3, the groove 10 can be a prefabricated spiral steel box and fixed with a steel bar cage 20, and can be connected to the steel bar cage by welding on the connecting ribs, and a threaded protrusion is formed on the side surface of the pile foundation 1 after grouting, thereby increasing the side friction resistance of the pile foundation 1.

[0028] Multiple single piles of the above-mentioned embodiment 1, embodiment 2 and embodiment 3 can also be used to form a pile group foundation, referring to Figure 1 As shown, a cap 11 is provided above the pile foundation 1, and a connecting piece 12 is pre-embedded on the cap 11. The caps 11 of adjacent pile foundations 1 are connected by a connecting beam 14, and a connecting piece 12 is also provided on the connecting beam 14. The connecting piece 12 is provided with a hole, and a high-strength bolt passes through the hole to connect the connecting beam 14 with the connecting piece 12 of the cap 11. A concrete slab 13 is laid above the cap 11 and the connecting beam 14, and a sand and gravel cushion layer 26 is laid above the concrete slab 13, and a concrete layer is poured above the cushion layer. Compared with the traditional concrete pouring above the pile group foundation, the foundation reinforcement structure of this embodiment can rotate between the cap 11 and the connecting beam 14 to a certain extent, and a concrete slab 13 is laid above, and then a sand and gravel cushion layer 26 is laid, and a concrete structure is poured above the sand and gravel cushion layer 26. When the building is unevenly stressed locally and the settlement of the single piles is different, the concrete structure above can be prevented from breaking or cracking.

[0029] When the required pile foundation length is longer, adjacent pile foundations 1 can also be connected through a connecting portion, referring to Figure 6As shown, the connection portion includes a first connection end 15, a second connection end 16 and a connection ring 17. The first connection end 15 is provided with a step surface 23 on the upper end surface of one of the pile foundations 1, and a connection strip 18 is pre-embedded below the step surface 23. The steel bar 20 of the pile foundation 1 extends to the outer side of the upper end surface of the pile foundation 1; the second connection end 16 is provided with a step surface 23 on the lower end surface of the other pile foundation 1, and a connection strip 18 is pre-embedded above the step surface 23. The steel bar 20 extends to the outer side of the lower end surface of the pile foundation 1 and is suitable for being connected to the steel bar 20 on the corresponding upper end surface through a threaded pipe 21; connection strips 18 for connecting to the first connection end 15 and the second connection end 16 are provided on both sides of the connection ring 17, and the connection ring 17 cooperates with the end head of the pile foundation 1. When connecting, the connecting ring 17 is put on one end, and the steel bar 20 on the adjacent end is connected with the threaded tube 21. A closable window 22 can be set in the middle of the connecting ring 17 for tightening the threaded tube 21. After the threaded tube 21 is tightened, the two ends of the connecting ring 17 are respectively matched with the ends of the adjacent pile foundations 1, and the pile foundations 1 adjacent in the longitudinal direction are connected with high-strength bolts. The pile foundation 1 is also provided with a grouting pipe 2 for grouting the connection part to fix the end of the pile foundation 1 and the connecting ring 17 to form a whole. It should be noted that the hole of the connecting strip can be set as a step hole, and the bolt head and nut are hidden in the step hole. Compared with the traditional method of connecting adjacent pile foundations by pouring a cap, this embodiment first fixes the ends of the two adjacent pile foundations 1, and connects the two piles as a whole through grouting of the grouting pipe 2, which is more convenient and shortens the construction period.

[0030] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A building foundation reinforcement support structure, comprising a prefabricated pile foundation, characterized in that: The pile foundation comprises a grouting pipe, the grouting pipe comprises a grouting port, the grouting port is provided with an elastic sealing belt for isolating the soil, and the sealing belt expands into the soil layer to form a bag shape after grouting.

2. A building foundation reinforcement support structure according to claim 1, characterized in that: The grouting pipe is arranged in the middle of the pile foundation, the grouting pipe is connected to the transverse pipe, the transverse pipe is provided with a grouting port on the side wall of the pile foundation, the grouting pipe is provided with a grouting port at the bottom of the pile foundation, and the grouting port is connected to a rubber sealing belt.

3. A building foundation reinforcement support structure according to claim 1, characterized in that: The grouting pipe is longitudinally pre-buried on one side of the pile foundation close to the side wall. An annular groove is provided on the side wall of the pile foundation. An annular pipe is arranged in the annular groove. The annular pipe is connected to the longitudinal grouting pipe. A plurality of grouting ports are arranged on the annular pipe. A sealing belt is arranged on the annular groove.

4. A building foundation reinforcement support structure according to claim 3, characterized in that: The pile foundation is a special-shaped pile, and a plurality of longitudinal grooves are symmetrically arranged on the pile foundation. The longitudinal grouting pipe is longitudinally arranged in the groove, and a sealing belt is arranged on the outer side of the longitudinal groove.

5. A building foundation reinforcement support structure according to claim 3 or 4, characterized in that: The annular grooves are arranged at equal intervals, and the grouting ports are arranged at equal intervals on the annular tube.

6. The building foundation reinforcement support structure according to claim 1, characterized in that: A spiral groove is preformed on the outer wall of the pile foundation, a grouting pipe is buried in the groove, grouting holes are arranged at equal intervals on the grouting pipe, and a sealing belt is arranged on the outer side of the groove.

7. A building foundation reinforcement support structure according to any one of claims 1 to 4, characterized in that: The ends of adjacent pile foundations are connected by a connecting portion, and the connecting portion includes: A first connection end and a second connection end, wherein the first connection end is provided with a step surface at the upper end of one of the pile foundations, a connection strip is pre-buried below the step surface, and the steel bars of the pile foundation extend to the outer side of the upper end surface of the pile foundation; the second connection end is provided with a step surface at the lower end surface of the other pile foundation, a connection strip is pre-buried above the step surface, and the steel bars extend to the outer side of the lower end surface of the pile foundation and are suitable for being connected to the steel bars of the corresponding upper end surface through a threaded pipe; A connecting ring, wherein connecting strips for connecting with the first connecting end and the second connecting end are arranged on both sides of the connecting ring, and the connecting ring cooperates with the end of the pile foundation.

8. A building foundation reinforcement support structure according to claim 7, characterized in that: The pile foundation is also provided with a grouting pipe for grouting the connection part to fix the end of the pile foundation and the connection ring to form a whole.

9. A building foundation reinforcement support structure according to any one of claims 1 to 4, characterized in that: A pedestal is provided above the pile foundation, threaded connectors are pre-embedded on the pedestal, adjacent pile foundations are connected by connecting beams, the connecting beams and the pedestals are connected by high-strength bolts, concrete slabs are laid above the pedestals and the connecting beams, a sand and gravel cushion layer is laid above the concrete slabs, and a concrete layer is poured above the cushion layer.

Images