Complete set of pile tips expanded through soft capsule grouting and construction method of complete set of pile tips

Abstract

The invention provides a complete pile tip expanded through soft bag grouting. The complete pile tip comprises a soft bag, a grouting pipe and a pile tip body. One end of the grouting pipe is inserted into the prefabricated hollow pile, and the other end of the grouting pipe is fixed with the pile tip; the grouting pipe is sleeved with the soft bag, and the soft bag is located between the prefabricated hollow pile and the pile tip. And a plurality of grout outlet holes are uniformly formed in the surface of the grouting pipe in the soft bag. According to the pressure grouting principle, the pile end is enlarged, meanwhile, the pile end soil layer is compacted, the compression resistance and uplift bearing capacity of the pile end is greatly improved, and pile settlement is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of building structures, in particular to a set of pile tips expanded by soft-bag grouting and a construction method thereof. Background Art

[0002] Post-grouting technology for precast piles is a technology developed in recent years. It utilizes the cavity in the middle of precast hollow piles (pipe piles or hollow square piles) to pre-embed grouting pipes, which can greatly increase the bearing capacity of the pile end and the soil layer near the pile end, thereby greatly increasing the bearing capacity of a single pile and reducing pile foundation settlement. However, it has disadvantages such as difficult to control grouting quality and long construction time.

[0003] In order to reduce the settlement problem of prefabricated hollow piles, the existing technology adopts the technology of ramming carrier piles inside prefabricated hollow piles, so as to improve the bearing capacity of single piles and reduce the settlement of pile foundations. However, the construction of the carrier is slow and noisy. Each pile needs to be rammed 200 to 300 times. The construction time of each carrier is about 2 hours, which requires more working hours. Summary of the invention

[0004] The purpose of the present invention is to provide a set of pile tips and a construction method thereof for increasing the bearing capacity of the pile end through grouting expansion and reducing the construction difficulty.

[0005] To achieve the above object, the present invention provides a set of pile tips expanded by soft-bag grouting, comprising a soft bag, a grouting pipe and a pile tip;

[0006] One end of the grouting pipe is inserted into the prefabricated hollow pile, and the other end of the grouting pipe is fixed to the pile tip;

[0007] The soft bag is sleeved on the grouting pipe, and the soft bag is located between the prefabricated hollow pile and the pile tip; a plurality of grouting holes are evenly arranged on the surface of the grouting pipe located in the soft bag.

[0008] Furthermore, both ends of the soft bag are fixed to the grouting pipe through locks, and the fixing method is simple.

[0009] Furthermore, the grouting pipe is arranged along the axial direction of the prefabricated hollow pile.

[0010] Furthermore, the pile tip includes a base plate and a cross-shaped pile tip located at the bottom of the base plate.

[0011] Furthermore, the soft capsule is wrapped with a mesh-woven protective cover.

[0012] The present invention also proposes a construction method for a complete set of pile tips expanded by soft-bag grouting. After the pile tip enters the bearing layer, a high-pressure grouting device is used to inject slurry from the grouting pipe at the top of the pile to the bottom of the pile at a steady pressure, speed and amount. The slurry is poured into the soft bag. When the internal pressure reaches a critical value, the protective cover is expanded, pushing the mortar to quickly squeeze and expand the soft bag, thereby forming an enlarged head at the pile end.

[0013] Compared with the prior art, the advantages of the present invention are:

[0014] 1. The present invention uses the principle of pressure grouting to expand the pile end and simultaneously compact the soil layer at the pile end, thereby greatly improving the compressive and tensile bearing capacity of the pile end and reducing pile settlement.

[0015] 2. The pile tip set of the present invention has a simple structure. Grouting holes are arranged at equal intervals on the grouting pipe in the soft bag, so that the grouting inside the soft bag is evenly distributed, ensuring the compactness of the grouting inside the expanded soft bag, thereby ensuring that the prefabricated pile can be used for a long time.

[0016] 3. The overall structure is compact, and the soft bag shrinks tightly against the grouting pipe before grouting expansion, effectively reducing the occupied space and facilitating transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the soft bag grouting expansion state of the complete set of pile tips in an embodiment of the present invention;

[0018] Figure 2 It is a cross-sectional view of a complete set of pile tips before grouting in an embodiment of the present invention;

[0019] Figure 3 It is a schematic diagram of the state where the soft bag is wrapped before grouting in an embodiment of the present invention. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be further described below.

[0021] The present invention provides a set of pile tips expanded by soft bag grouting, such as Figure 1 As shown, it is composed of three parts: a soft bag 4, a grouting pipe 2 and a pile tip 3.

[0022] One end of the grouting pipe 2 is inserted into the prefabricated hollow pile 1 along the axial direction of the prefabricated hollow pile 1, and the other end of the grouting pipe 2 is fixed to the pile tip 3;

[0023] The soft bag 4 is sleeved on the grouting pipe 2 and is located between the prefabricated hollow pile 1 and the pile tip 3. In this embodiment, the soft bag 4 is made of rubber with corrosion resistance and good elasticity. In practical applications, nylon, polyester fiber, polyurethane, polyurethane fabric, polyamide, rubber and other materials can also be used. Figure 2 As shown, a plurality of grouting holes are evenly arranged on the surface of the grouting pipe 2 located in the soft bag 4; the arrangement of the plurality of grouting holes can ensure uniform grouting in various parts of the soft bag 4, thereby ensuring the compactness of the grouting inside the soft bag 4.

[0024] In this embodiment, if Figure 2As shown, both ends of the soft bag 4 are fixed to the grouting pipe 2 by means of lock buckles 42, and the fixing method is simple and firm.

[0025] In this embodiment, the pile tip 3 is composed of a base plate and a cross-shaped pile tip 3 located at the bottom of the base plate. In addition to playing a connecting role, the design of the base plate can also improve the pull-out bearing capacity between the pile end and the foundation. The cross-shaped pile tip 3 can improve the stability of the pile tip 3 during the pre-embedded stage.

[0026] In this embodiment, if Figure 3 As shown, before the pile tip is installed, the soft capsule 4 is wrapped with a protective cover 41 in a mesh shape. The protective cover 41 wraps the soft capsule 4 on the surface of the grouting pipe 2, thereby preventing the soft capsule 4 from loosely spreading before the grouting expansion, and reducing the space occupied by the soft capsule 4 during the transportation stage. At the same time, the protective cover 41 also prevents the soft capsule 4 from being damaged during the transportation stage. The protective cover 41 can be a woven material with a certain protective effect such as nylon, polyester fiber, polyurethane, and polyurethane fabric. In this embodiment, nylon is used. During the grouting stage, the protective cover 41 with a woven structure can also be easily opened due to the pressure of the grouting.

[0027] The working principle of the complete set of pile tips of the present invention is as follows: after the pile tip 3 enters the bearing layer, a high-pressure grouting device is used to inject slurry from the grouting pipe 2 at the top of the pile to the bottom of the pile at a steady pressure, speed and amount, and the slurry is poured into the soft bag 4. When the internal pressure reaches a critical value, the protective cover 41 is expanded, pushing the mortar to quickly squeeze and expand the soft bag 4, thereby forming an enlarged head at the pile end.

[0028] The above is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any technician in the relevant technical field, without departing from the scope of the technical solution of the present invention, makes any form of equivalent replacement or modification to the technical solution and technical content disclosed in the present invention, which does not depart from the content of the technical solution of the present invention and still falls within the protection scope of the present invention.

Claims

1. A set of pile tips expanded by soft capsule grouting, characterized in that: Includes soft bladder, grouting pipe and pile tip; One end of the grouting pipe is inserted into the prefabricated hollow pile, and the other end of the grouting pipe is fixed to the pile tip; The soft bag is sleeved on the grouting pipe, and the soft bag is located between the prefabricated hollow pile and the pile tip; a plurality of grouting holes are evenly arranged on the surface of the grouting pipe located in the soft bag.

2. The set of pile tips expanded by soft bladder grouting according to claim 1 is characterized in that: The two ends of the soft bag are fixed to the grouting pipe through lock buckles.

3. The set of pile tips expanded by soft bladder grouting according to claim 1 is characterized in that: The grouting pipe is arranged along the axial direction of the prefabricated hollow pile.

4. The set of pile tips expanded by soft bladder grouting according to claim 1 is characterized in that: The pile tip comprises a bottom plate and a cross-shaped pile tip located at the bottom of the bottom plate.

5. The set of pile tips expanded by soft bladder grouting according to claim 1 is characterized in that: The soft capsule is wrapped with a protective cover woven in a mesh shape.

6. A construction method for a set of pile tips expanded by soft-bag grouting, using the set of pile tips expanded by soft-bag grouting as claimed in any one of claims 1 to 5, characterized in that: When the pile tip enters the bearing layer, a high-pressure grouting device is used to inject slurry from the grouting pipe at the top of the pile to the bottom of the pile at a steady pressure, speed and amount. The slurry is poured into the soft bag. When the internal pressure reaches a critical value, the protective cover is expanded, pushing the mortar to quickly expand the soft bag, thereby forming an enlarged head at the pile end.

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