Pile forming method for bag squeezing and expanding pile

Abstract

The invention discloses a bag squeezing and expanding pile forming method. A bag squeezing and expanding pile comprises a prefabricated pipe pile and a plurality of slurry bags fixed to the side wall of the prefabricated pipe pile. The bag squeezing and expanding pile forming method comprises the steps that pile hole forming and mortar replacement are carried out in a to-be-constructed area, then a prefabricated pipe pile is placed in a formed hole, and after the prefabricated pipe pile is placed in a pile hole of a foundation, concrete slurry is injected into a slurry bundling bag or into the slurry bundling bag and the prefabricated pipe pile; and the slurry bundling bag becomes an annular expansion ring body surrounding the prefabricated pipe pile and is embedded into a foundation. According to the bag squeezing and expanding pile, the nodes are additionally arranged on the pile body, so that the compression resistance and the pulling resistance of the pile body are achieved; meanwhile, the in-column water accumulation steel pipe is additionally arranged at the top of the pile to control the height of underground water, and the buoyancy of the pile is reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of prefabricated piles, and in particular, relates to a method for forming bag-extended piles. Background Art

[0002] For areas with high groundwater levels, abundant water resources and large rock and soil permeability coefficients, the buoyancy of water causes underground buildings to bear vertical upward loads, reducing the bearing capacity of the foundation and increasing the risk of structural instability. As the excavation depth of the foundation pit increases, the problem becomes more prominent, seriously affecting the construction and operational safety of the structure.

[0003] Pull-out piles rely on the side friction of the pile body (equal-section pull-out piles) and the enlarged head resistance (enlarged-bottom pull-out piles) to jointly bear the pull-out load on the top of the pile, thereby improving the safety of the structure and reducing the amount of buoyancy on the foundation. They have currently become an important preventive measure for the anti-floating of large underground space structures, the wind resistance of super-high buildings, and the resistance to pull-out.

[0004] Generally, piles of equal cross-section completely rely on the side friction of the pile to resist vertical loads. When the vertical tensile force exceeds the side friction of the pile, the pile body loses its ability to resist pullout. At this time, the soil around the pile does not fully play its role, and the pile itself does not reach its ultimate bearing capacity, resulting in a certain degree of waste of resources.

[0005] Expanded base piles are piles that expand part of the space at the bottom of the pile to the outside of the surrounding soil. Although this type of expanded base pile increases the bearing capacity of the pile end compared to piles of equal cross-section, the bearing capacity of the pile side is not significantly improved. Summary of the invention

[0006] The purpose of the present application is to overcome the problems of the prior art and disclose a method for forming bag-extended piles. The bag-extended piles of the present application achieve compression and tension resistance of the pile body by adding nodes to the pile body.

[0007] On the one hand, the purpose of this application is achieved through the following technical solutions:

[0008] A method for forming piles using bag-extended piles, the bag-extended piles comprising prefabricated pipe piles and a plurality of mortar bags fixed to the side walls of the prefabricated pipe piles; the method for forming piles using bag-extended piles comprising: drilling a pile hole and replacing mortar in a construction area, then lowering the prefabricated pipe pile into the drilled hole, after the prefabricated pipe pile is lowered into the pile hole of the foundation, injecting concrete slurry into the mortar bag or into the mortar bag and the prefabricated pipe pile, so that the mortar bag becomes a circular expansion ring around the prefabricated pipe pile, and is embedded in the foundation.

[0009] According to a preferred embodiment, a slurry pipe is provided between the central cavity of the prefabricated pipe pile and the slurry bag, and a sleeve valve grouting pipe is provided in the central cavity of the prefabricated pipe pile.

[0010] The grouting of the central cavity of the prefabricated pipe pile is completed through the sleeve valve grouting pipe, and when the grouting of the central cavity is completed, the slurry is injected into the slurry bag through the slurry pipe.

[0011] According to a preferred embodiment, the grouting of the grout bag is completed through a pile side grouting pipe arranged on the outside of the prefabricated pipe pile.

[0012] According to a preferred embodiment, a steel pipe for collecting water in the column is provided at the top of the bag-extended pile, and the steel pipe for collecting water in the column is arranged at the top of the central cavity of the prefabricated pipe pile.

[0013] The bottom end of the steel pipe for collecting water in the column is a sealed structure, and the steel pipe for collecting water in the column is connected to the outer space of the bag-expanded pile through a water inlet hole arranged on the side wall of the prefabricated pipe pile, so as to collect groundwater outside the bag-expanded pile.

[0014] According to a preferred embodiment, a drainage pipe is further provided in the steel pipe for accumulating water in the column, for draining the water in the steel pipe for accumulating water in the column.

[0015] According to a preferred embodiment, a water level monitor is provided in the steel pipe for accumulating water in the column, which is used to complete the water level monitoring in the steel pipe for accumulating water in the column.

[0016] According to a preferred embodiment, a water reservoir is further provided near the bag-expanded piles, and the water reservoir is connected to the water-accumulating steel pipes in the columns of each bag-expanded pile through a precipitation pipe, and the bottom horizontal line of the water reservoir is 2 to 3 meters lower than the bottom of the water-accumulating steel pipes in the columns.

[0017] According to a preferred embodiment, the bottom end of the prefabricated pipe pile is provided with a terminal or a cross anchor hook.

[0018] According to a preferred embodiment, the cross anchor hook comprises: a connecting rod, a cross frame and a channel steel, wherein the cross frame is connected and fixed to the bottom end of the prefabricated pipe pile via the connecting rod;

[0019] Each end of the cross-shaped frame is connected to a channel steel via a rotating shaft; during the pile driving process, each channel steel is bent and arranged close to the connecting rod. When reaching the bottom side of the pile hole, the pile is pulled in the reverse direction to expand each channel steel to form a cross-shaped enlarged head structure.

[0020] According to a preferred embodiment, the top and bottom sides of the slurry bag are respectively provided with fixing rings for fixing the top and bottom edges of the slurry bag to the prefabricated pipe piles;

[0021] When the prefabricated pipe pile is a prefabricated cement pile, a ring-shaped groove node is provided on the side wall of the prefabricated cement pile, and the edge of the grout bag is crimped into the groove node via a fixing ring, and the fixing ring is fixed to the prefabricated pipe pile via rivets;

[0022] When the prefabricated pipe pile is a prefabricated steel pipe pile, the side wall of the prefabricated steel pipe pile is provided with vertically adjacent raised nodes, the edge of the slurry bag is crimped into the groove structure formed between the two raised nodes via a fixing ring, and the fixing ring is fixed to the prefabricated pipe pile via rivets.

[0023] The aforementioned main scheme of the present application and its further options can be freely combined to form multiple schemes, all of which are schemes that can be adopted and claimed for protection in the present application. After understanding the scheme of the present application, those skilled in the art can understand that there are multiple combinations based on the prior art and common knowledge, all of which are technical schemes to be protected by the present application, and they are not exhaustively listed here.

[0024] Beneficial effects of this application:

[0025] The bag-expanded pile of the present application realizes the compression and pull-out resistance of the pile body by adding nodes to the pile body; at the same time, by adding a steel pipe for water accumulation in the column at the top of the pile, the height of the groundwater is controlled and the buoyancy of the pile is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is an implementation structure of the bag extrusion pile of the present application;

[0027] Figure 2 It is an implementation structure of the bag extrusion pile of the present application;

[0028] Figure 3 It is an implementation structure of the bag extrusion pile of the present application;

[0029] Figure 4 It is an implementation structure of the bag extrusion pile of the present application;

[0030] Figure 5 It is an implementation structure of the bag extrusion pile of the present application;

[0031] Figure 6 It is an implementation structure of the bag extrusion pile of the present application;

[0032] Figure 7 It is a fixed structure of the pulp bag of the present application;

[0033] Figure 8 It is a fixed structure of the pulp bag of the present application;

[0034] Fig. 9 This is a schematic diagram of the structure of the cross anchor hook of the present application;

[0035] Fig.10 Schematic diagram of drainage process of bag-squeezed piles in this application;

[0036] Fig.11 Schematic diagram of the pile forming process of the bag-extended pile of the present application;

[0037] Among them, 1-prefabricated pipe pile, 2-water accumulation steel pipe in the column, 3-bundle slurry bag, 4-water level monitor, 5-water inlet hole, 6-dewatering pipe, 7-slurry pipe, 8-sleeve valve grouting pipe, 9-end, 10-fixing ring, 11-cross anchor hook, 12-pile side grouting pipe, 101-prefabricated cement pile, 102-groove node, 103-rivet, 104-prefabricated steel pipe pile, 105-raised node, 110-connecting rod, 111-frame, 112-rotating shaft, 113-channel steel. DETAILED DESCRIPTION

[0038] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0040] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0041] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0042] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] In addition, the present application would like to point out that, in the present application, unless the specific structure, connection relationship, positional relationship, power source relationship, etc. are specifically written out, the structure, connection relationship, positional relationship, power source relationship, etc. involved in the present application are all known by those skilled in the art on the basis of the prior art without creative work.

[0044] Example 1

[0045] refer to Figures 1 to 11 As shown, the present application discloses a method for forming bag-extended piles, wherein the bag-extended piles include a prefabricated pipe pile 1 and a plurality of mortar bags 3 fixed to the side walls of the prefabricated pipe pile 1; the method for forming bag-extended piles includes: performing pile hole drilling and mortar replacement in the area to be constructed, and then lowering the prefabricated pipe pile 1 into the drilled hole; after the prefabricated pipe pile 1 is lowered into the pile hole of the foundation, concrete slurry is injected into the mortar bag 3 or into the mortar bag 3 and the prefabricated pipe pile 1, so that the mortar bag 3 becomes an annular expansion ring around the prefabricated pipe pile 1, and is embedded in the foundation, thereby increasing the compression and pullout resistance of the bag-extended pile.

[0046] Preferably, reference Figures 1 to 3 As shown, a slurry pipe 7 is provided between the central cavity of the prefabricated pipe pile 1 and the slurry bag 3, and a sleeve valve grouting pipe 8 is provided in the central cavity of the prefabricated pipe pile 1. Grouting of the central cavity of the prefabricated pipe pile 1 is completed through the sleeve valve grouting pipe 8, and when the grouting of the central cavity is completed under the action of pressure, the slurry is injected into the slurry bag 3 through the slurry pipe 7.

[0047] Preferably, reference Figures 4 to 6 As shown, the grout bag 3 is grouted through the pile side grouting pipe 12 arranged on the outside of the prefabricated pipe pile 1.

[0048] Preferably, a steel pipe 2 for collecting water in the column is provided at the top of the bag-expanded pile, and the steel pipe 2 for collecting water in the column is arranged at the top of the central cavity of the prefabricated pipe pile 1. The bottom end of the steel pipe 2 for collecting water in the column is a sealing structure, and the steel pipe 2 for collecting water in the column is connected to the outer space of the bag-expanded pile through a water inlet hole 5 arranged on the side wall of the prefabricated pipe pile 1, so as to collect groundwater outside the bag-expanded pile.

[0049] Furthermore, a water discharge pipe 6 is provided in the water-collecting steel pipe 2 for draining the water in the water-collecting steel pipe 2. A water level monitor 4 is provided in the water-collecting steel pipe 2 for monitoring the water level in the water-collecting steel pipe 2.

[0050] Furthermore, a water reservoir is provided near the bag-extended piles, and the water reservoir is connected to the water-accumulating steel pipe 2 in the column of each bag-extended pile through a precipitation pipe 6, and the bottom horizontal line of the water reservoir is 2 to 3 meters lower than the bottom of the water-accumulating steel pipe 2 in the column. In this way, if water accumulates in the water-accumulating steel pipe in the column, it can be drained through the siphon effect. A water level detector is provided in the water-accumulating steel pipe to detect the water level of the water-accumulating steel pipe in the column. Normally, drainage is completed through the siphon effect. When a certain water level is reached, the water level detector will give an early warning, and then automatically start the water pump to change to passive drainage to stabilize the groundwater level.

[0051] Preferably, the bottom end of the prefabricated pipe pile 1 is provided with an end cap 9 or a cross anchor hook 11. Further, the cross anchor hook 11 comprises: a connecting rod 110, a cross frame 111 and a channel steel 113, wherein the cross frame 111 is connected and fixed to the bottom end of the prefabricated pipe pile 1 via the connecting rod 110; each end of the cross frame 111 is respectively connected to a channel steel 113 via a rotating shaft 112; during the pile driving process, each channel steel 113 is bent and arranged close to the connecting rod 110, and when reaching the bottom side of the pile hole, each channel steel 113 is unfolded by pulling the pile in the opposite direction to form a cross-shaped enlarged head structure.

[0052] Preferably, fixing rings 10 are respectively provided on the top and bottom sides of the slurry bag 3 to fix the top and bottom edges of the slurry bag 3 to the prefabricated pipe pile 1 .

[0053] Furthermore, when the prefabricated pipe pile 1 is a prefabricated cement pile 101, an annular groove node 102 is provided on the side wall of the prefabricated cement pile 101, the edge of the grout bag 3 is crimped into the groove node 102 via a fixing ring 10, and the fixing ring 10 is fixed to the prefabricated pipe pile 1 via a rivet 103. Thus, the fixing stability of the grout bag 3 is increased through the groove node 102.

[0054] Furthermore, when the prefabricated pipe pile 1 is a prefabricated steel pipe pile 104, the side wall of the prefabricated steel pipe pile 104 is provided with vertically adjacent raised nodes 105, the edge of the slurry bag 3 is crimped into the groove structure formed between the two raised nodes 105 via a fixing ring 10, and the fixing ring 10 is fixed to the prefabricated pipe pile 1 via a rivet 103. Thus, the fixing stability of the slurry bag 3 is increased through the raised nodes 105.

[0055] The bag-expanded pile of the present application realizes the compression and pull-out resistance of the pile body by adding nodes to the pile body; at the same time, by adding a steel pipe for water accumulation in the column at the top of the pile, the height of the groundwater is controlled and the buoyancy of the pile is reduced.

[0056] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A method for forming piles by squeezing and expanding bags, characterized in that: The bag-extended pile comprises a prefabricated pipe pile (1) and a plurality of slurry bags (3) fixed to the side wall of the prefabricated pipe pile (1); the bag-extended pile forming method comprises: The pile hole is drilled and the mortar is replaced in the area to be constructed, and then the prefabricated pipe pile (1) is placed in the drilled hole. After the prefabricated pipe pile (1) is placed in the pile hole of the foundation, Concrete slurry is injected into the grout bag (3) or into the grout bag (3) and the prefabricated pipe pile (1), so that the grout bag (3) becomes a circular expansion ring around the prefabricated pipe pile (1) and is embedded in the foundation.

2. The method for forming piles by squeezing and expanding the piles with bags as claimed in claim 1, characterized in that: A slurry pipe (7) is provided between the central cavity of the prefabricated pipe pile (1) and the slurry bag (3), and a sleeve valve grouting pipe (8) is provided in the central cavity of the prefabricated pipe pile (1). Grouting of the central cavity of the prefabricated pipe pile (1) is completed through the sleeve valve grouting pipe (8), and when the grouting of the central cavity is completed, the slurry is injected into the slurry bag (3) through the slurry pipe (7).

3. The method for forming piles by squeezing and expanding piles with bags as claimed in claim 1, characterized in that: The grouting of the grout bag (3) is completed through the pile side grouting pipe (12) arranged outside the prefabricated pipe pile (1).

4. The method for forming piles by squeezing and expanding piles with bags as claimed in claim 1, characterized in that: A steel pipe (2) for collecting water in the column is arranged at the top of the bag-extended pile, and the steel pipe (2) for collecting water in the column is arranged at the top of the central cavity of the prefabricated pipe pile (1). The bottom end of the water-collecting steel pipe (2) in the column is a sealed structure, and the water-collecting steel pipe (2) in the column is connected to the outer space of the bag-expanded pile through a water inlet hole (5) arranged on the side wall of the prefabricated pipe pile (1), so as to collect groundwater outside the bag-expanded pile.

5. The method for forming piles by squeezing and expanding piles with bags as claimed in claim 4, characterized in that: The water-collecting steel pipe (2) in the column is also provided with a drainage pipe (6) for draining the water in the water-collecting steel pipe (2) in the column.

6. The method for forming piles by squeezing and expanding piles with bags as claimed in claim 5, characterized in that: A water level monitor (4) is provided in the water-collecting steel pipe (2) in the column, and is used to monitor the water level in the water-collecting steel pipe (2) in the column.

7. The method for forming piles by squeezing and expanding piles with bags as claimed in claim 5, characterized in that: A water reservoir is also provided near the bag-extended piles. The water reservoir is connected to the water-collecting steel pipe (2) in the column of each bag-extended pile via a precipitation pipe (6). The bottom level of the water reservoir is 2 to 3 meters lower than the bottom of the water-collecting steel pipe (2) in the column.

8. The method for forming piles by squeezing and expanding piles with bags as claimed in claim 1, characterized in that: The bottom end of the prefabricated pipe pile (1) is provided with a terminal (9) or a cross anchor hook (11).

9. The method for forming piles by squeezing and expanding piles with bags as claimed in claim 8, characterized in that: The cross anchor hook (11) comprises: a connecting rod (110), a cross-shaped frame (111) and a channel steel (113); the cross-shaped frame (111) is connected and fixed to the bottom end of the prefabricated pipe pile (1) via the connecting rod (110); Each end of the cross-shaped frame (111) is connected to a channel steel (113) via a rotating shaft (112); during the pile driving process, each channel steel (113) is bent and arranged close to the connecting rod (110); when reaching the bottom side of the pile hole, the pile is pulled in the reverse direction to expand each channel steel (113) to form a cross-shaped enlarged head structure.

10. The method for forming piles by squeezing and expanding piles with bags as claimed in claim 1, characterized in that: The top and bottom sides of the slurry bag (3) are respectively provided with fixing rings (10) for fixing the top and bottom edges of the slurry bag (3) to the prefabricated pipe pile (1); When the prefabricated pipe pile (1) is a prefabricated cement pile (101), an annular groove node (102) is provided on the side wall of the prefabricated cement pile (101), the edge of the grout bag (3) is crimped into the groove node (102) via a fixing ring (10), and the fixing ring (10) is fixed to the prefabricated pipe pile (1) via a rivet (103); When the prefabricated pipe pile (1) is a prefabricated steel pipe pile (104), the side wall of the prefabricated steel pipe pile (104) is provided with vertically adjacent raised nodes (105), the edge of the slurry bag (3) is crimped into a groove structure formed between two raised nodes (105) via a fixing ring (10), and the fixing ring (10) is fixed to the prefabricated pipe pile (1) via a rivet (103).

Images