Device for reinforcing pile foundation

Abstract

The utility model relates to the technical field of reinforcing devices for buildings, in particular to a device for reinforcing a pile foundation. A device for reinforcing a pile foundation comprises at least three reinforcing piles evenly distributed in the circumferential direction of the pile foundation, the reinforcing piles stretch into the foundation, the bottoms of the reinforcing piles stretch into a natural soil layer below backfill soil, the reinforcing piles are connected through connecting pieces, and the connecting pieces are connected with the pile foundation. According to the device for reinforcing the pile foundation, at least three reinforcing piles are evenly arranged in the circumferential direction of the pile foundation, and the situation that the pile foundation deviates due to the uneven reinforcing effect can be avoided; the reinforcing piles extend into the natural soil layer below the backfill soil and are connected to the pile foundations through the connecting pieces, so that part of load of the pile foundations can be transmitted to the natural soil layer, and adverse effects on buildings caused by settlement of the backfill soil are reduced as much as possible; the connecting piece is connected to the pile foundation, so that when the pile foundation deviates due to differential settlement of the foundation, the connecting piece can support the pile foundation.

Description

Technical Field

[0001] The utility model relates to the technical field of reinforcement devices for buildings, in particular to a device for reinforcing pile foundations. Background Art

[0002] Backfill refers to the process of returning the excavated soil or other qualified filling materials to the excavation area after completing underground structures, foundations, pipeline installation and other hidden works below the ground in various construction projects, and forming a solid and stable foundation or ground soil through appropriate compaction, leveling and other construction steps. Backfill is prone to uneven settlement, resulting in a gap between the bottom of the building based on the backfill layer and the top of the backfill layer, affecting the stability of the building above the backfill. Utility Model Content

[0003] The purpose of the utility model is to solve the problem that the soil in the backfill area is prone to uneven settlement in the prior art, but related buildings have been constructed in the backfill area, and compacting or replacing the backfill soil will affect the stability of the completed buildings. A device for pile foundation reinforcement is provided.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A device for reinforcing a pile foundation comprises at least three reinforcing piles evenly distributed along the circumference of the pile foundation, wherein the reinforcing piles extend into the foundation, and the bottoms of the reinforcing piles extend into the natural soil layer below the backfill soil. The reinforcing piles are connected by connecting pieces, and the connecting pieces are connected to the pile foundation.

[0006] At least three reinforcement piles are evenly distributed along the circumference of the pile foundation, so that a relatively even reinforcement effect can be applied to the pile foundation, and the displacement of the pile foundation caused by uneven reinforcement effect can be avoided as much as possible. The reinforcement piles extend into the natural soil layer below the backfill soil, and the reinforcement piles are connected to the pile foundation through connectors, so that part of the load of the pile foundation can be transferred to the natural soil layer, minimizing the adverse effects of the settlement of the backfill soil on the building. The connector is connected to the pile foundation, so when the pile foundation is offset due to uneven settlement of the foundation, the connector can support the pile foundation. Compared with the prior art of directly compacting the backfill soil, this device will not generate excess lateral stress on the soil; compared with replacing the backfill soil, it will not change the foundation depth to affect the force of the pile foundation, which is beneficial to improving the stability of the structure.

[0007] As a preferred solution of the utility model, the connecting members corresponding to two adjacent pile foundations are connected by a connecting beam.

[0008] When two adjacent connecting members are connected by a connecting beam, the forces of the two adjacent pile foundations are connected, thereby avoiding uneven settlement of the two adjacent pile foundations after reinforcement, which affects the quality of the building.

[0009] As a preferred solution of the present utility model, the connecting members are all steel members, and the connecting beams are also steel members with corresponding shapes and sizes.

[0010] If the connecting parts and the connecting beams are both I-beam components, the stability of the structure can be improved, thereby helping to improve the stability of the pile foundation.

[0011] As a preferred embodiment of the present invention, the connecting member includes a first connecting member and a second connecting member, the second connecting member is located on the top surface of the first connecting member, the first connecting member is sleeved outside one of the pile foundations and connects all the reinforcement piles around the pile foundation, and the second connecting member connects the corresponding pile foundations.

[0012] The first connecting member is connected to the second connecting member, and the reinforcement piles surrounding the same pile foundation are all connected to the first connecting member. The second connecting member is arranged on the top surface of the first connecting member, and the second connecting member is connected to the pile foundation. The second connecting member can provide a larger bending moment when the pile foundation is offset, which is beneficial to improving the structural stability.

[0013] As a preferred solution of the present utility model, the cross-sectional shape of the pile foundation is an I-shape, and the second connecting member is connected to the wing plate of the pile foundation.

[0014] The wing plate of the pile foundation is the plate where the two parallel lines of the I-shaped section are located. Compared with being directly connected to the web plate, the second connecting member is connected to the wing plate, which can improve the bending resistance of the pile foundation and avoid stress concentration as much as possible, thereby preventing the pile foundation from being damaged at the stress point.

[0015] As a preferred solution of the present utility model, the reinforcement piles are steel pipe piles.

[0016] Steel pipe piles have strong bearing capacity, and when the reinforcement piles are driven into the ground, the steel pipes can act as templates to improve construction efficiency.

[0017] As a preferred embodiment of the present invention, the length of the reinforcement pile extending into the natural soil layer is greater than or equal to 5m.

[0018] The reinforcement piles extend into the natural soil layer by at least 5m, which can transfer the load of the pile foundation to the natural soil layer through the reinforcement piles as much as possible, which is beneficial to improving the stability of the structure.

[0019] As a preferred solution of the present utility model, the connecting piece is welded to the pile foundation.

[0020] The use of welding is beneficial to improving the stability of the structure.

[0021] As a preferred solution of the present invention, the connecting member is connected to the pile foundation by bolts.

[0022] The structure is easy to install by adopting bolts.

[0023] As a preferred solution of the utility model, the reinforcement piles extend 10-15 cm above the ground.

[0024] If the reinforcement piles extend 10-15 cm above the ground, the height of the connection between the connector and the pile foundation can be increased as much as possible, which is beneficial to improving the stability of the structure.

[0025] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0026] A device for reinforcing pile foundations, at least three reinforcing piles are evenly arranged around the pile foundation, which can avoid the displacement of the pile foundation caused by uneven reinforcement effect; the reinforcing piles extend into the natural soil layer below the backfill soil, and the reinforcing piles are connected to the pile foundation through connectors, so that part of the load of the pile foundation can be transferred to the natural soil layer, minimizing the adverse effects of the settlement of the backfill soil on the building; the connector is connected to the pile foundation, so when the pile foundation is offset due to uneven settlement of the foundation, the connector can support the pile foundation. This device solves the problem in the prior art that the soil in the backfill area is prone to uneven settlement, but related buildings have been built in the backfill area, and compacting or replacing the backfill soil will affect the stability of the completed building. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural diagram of a device for pile foundation reinforcement in Example 1;

[0028] Figure 2 It is a top view of a device for pile foundation reinforcement in Example 1.

[0029] Icon: 1-steel pipe pile, 2-first connecting piece, 3-second connecting piece, 4-connecting beam, 5-pile foundation. DETAILED DESCRIPTION

[0030] The utility model is described in detail below in conjunction with the accompanying drawings.

[0031] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0032] Example 1

[0033] like Figure 1-Figure 2As shown, a device for pile foundation reinforcement comprises at least three reinforcement piles evenly distributed along the circumference of the pile foundation 5, wherein the reinforcement piles extend into the foundation, and the bottoms of the reinforcement piles extend into the natural soil layer below the backfill soil, and the reinforcement piles are connected by connecting pieces, and the connecting pieces are connected to the pile foundation 5.

[0034] The connector includes a first connector 2 and a second connector 3, wherein the second connector 3 is located on the top surface of the first connector 2, the first connector 2 is connected to a plurality of reinforcement piles surrounding a pile foundation 5, and the second connector 3 is connected to the corresponding pile foundation 5. The first connector 2 and the second connector 3 are connected, and the reinforcement piles surrounding the same pile foundation 5 are all connected to the first connector 2, the second connector 3 is arranged on the top surface of the first connector 2, and the second connector 3 is connected to the pile foundation 5, so that the second connector 3 can provide a larger bending moment when the pile foundation 5 is offset, which is beneficial to improve the structural stability. In this embodiment, four reinforcement piles are arranged around the pile foundation 5, and the top surface of the reinforcement piles is connected to the first connector 2, and the first connector 2 surrounds the pile foundation 5. The cross-sectional shape of the pile foundation 5 is an I-shaped, and the second connector 3 is connected to the wing plate of the pile foundation 5. The wing plate of the pile foundation 5 is the plate where the two parallel lines of the I-shaped cross section are located. The second connecting member 3 is connected to the wing plate, which can improve the bending resistance of the pile foundation 5 compared to being directly connected to the web plate, and can avoid stress concentration as much as possible, thereby preventing the pile foundation 5 from being damaged at the stress point. The connecting members are all I-beam components, and the connecting beam 4 is also an I-beam component of corresponding size. The connecting members of the two adjacent pile foundations 5 are connected by a connecting beam 4. When two adjacent connecting members are connected by a connecting beam 4, the forces of the two adjacent pile foundations 5 are connected, thereby avoiding uneven settlement of the two adjacent pile foundations 5 after reinforcement, which affects the quality of the building.

[0035] The reinforcement pile is a steel pipe pile 1. The length of the reinforcement pile extending into the natural soil layer is greater than or equal to 5m. The reinforcement pile extends out of the ground by 10-15cm.

[0036] The connecting member is welded to the pile foundation 5 , and can also be replaced by the connecting member being connected to the pile foundation 5 by bolts.

[0037] The construction requirements of this device are as follows:

[0038] (1) The steel pipe pile 1 is drilled by rotary drilling with cement-clay slurry as the wall protection. The cement-clay slurry ratio is (water: cement: clay = 2:1:0.2) by weight. The opening diameter is Φ168 mm and the finished hole diameter is Φ146 mm.

[0039] (2) The steel pipe pile 1 shall penetrate into the natural soil layer below the backfill soil by not less than 5.0 m.

[0040] (3) The steel pipe pile 1 is made of φ127*8mm steel pipe, which is mechanically connected by open thread + sleeve.

[0041] (4) The grouting material for steel pipe pile 1 is M5 cement mortar.

[0042] The construction steps are as follows:

[0043] (1) Drilling

[0044] After the steel pipe pile 1 is positioned, a cement clay slurry rotary drilling is performed using an XY-1B or DJL-350 drilling rig. The hole diameter is Φ168mm and a three-way device is configured to facilitate mud collection. The hole diameter is Φ146mm and the depth of penetration into the original soil is not less than 5.0m.

[0045] (2) Insert the steel pipe

[0046] After drilling and cleaning, insert a Φ127mm steel pipe to the bottom of the hole according to the depth of the hole (drill a hole 1m from the bottom of the steel pipe, with a diameter of 20mm), and the pipe mouth should be 10 to 15cm above the floor. Before grouting, the hole mouth should be covered and protected to prevent mud and debris from falling into the hole and affecting grouting.

[0047] (3) Pouring M5 cement mortar

[0048] After each column base is drilled and the steel pipe is lowered, cement mortar will be poured into the four steel pipe piles 1 in the column base. A catheter will be used to pour from the bottom of the steel pipe pile 1. When the poured cement mortar reaches the designed amount and the cement mortar fills the hole mouth, the pouring will be stopped.

[0049] (4) Grouting of pipe opening

[0050] When the amount of cement mortar reaches the designed grouting amount, a grouting device is installed at the pipe mouth to press cement mortar into the pipe. After thick mortar returns to the outside of the steel pipe, the grouting can be stopped and the pipe mouth grouting device can be removed.

[0051] (5) Waiting for setting and grouting

[0052] After the grouting of steel pipe pile 1 is completed, wait for the slurry to initially set and shrink and sink, then fill it up to the hole mouth with cement mortar.

[0053] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for pile foundation reinforcement, characterized in that: It comprises at least three reinforcement piles evenly distributed along the circumference of the pile foundation (5), the reinforcement piles extending into the foundation, the bottoms of the reinforcement piles extending into the natural soil layer below the backfill soil, the reinforcement piles connected by connecting pieces, and the connecting pieces are connected to the pile foundation (5).

2. A device for pile foundation reinforcement according to claim 1, characterized in that: The connecting members corresponding to two adjacent pile foundations (5) are connected via a connecting beam (4).

3. A device for pile foundation reinforcement according to claim 2, characterized in that: The connecting members are all steel profile components, and the connecting beam (4) is also a steel profile component with corresponding shape and size.

4. The device for pile foundation reinforcement according to claim 1, characterized in that: The connecting member comprises a first connecting member (2) and a second connecting member (3), wherein the second connecting member (3) is located on the top surface of the first connecting member (2), the first connecting member (2) is sleeved outside one of the pile foundations (5) and connects all the reinforcement piles around the pile foundation (5), and the second connecting member (3) connects the corresponding pile foundation (5).

5. The device for pile foundation reinforcement according to claim 4, characterized in that: The cross-sectional shape of the pile foundation (5) is an I-shape, and the second connecting member (3) is connected to the wing plate of the pile foundation (5).

6. A device for pile foundation reinforcement according to any one of claims 1 to 5, characterized in that: The reinforcement pile is a steel pipe pile (1).

7. A device for pile foundation reinforcement according to any one of claims 1 to 5, characterized in that: The length of the reinforcement pile extending into the natural soil layer is greater than or equal to 5m.

8. A device for pile foundation reinforcement according to any one of claims 1 to 5, characterized in that: The connecting piece is welded to the pile foundation (5).

9. A device for pile foundation reinforcement according to any one of claims 1 to 5, characterized in that: The connecting member is connected to the pile foundation (5) by means of bolts.

10. A device for pile foundation reinforcement according to any one of claims 1 to 5, characterized in that: The reinforcement piles extend out of the ground by 10-15 cm.

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