Composite pipe pile main body structure and composite pipe pile

Abstract

The composite pipe pile body structure comprises a pile pipe, a pile tip is coaxially arranged at the bottom end of the pile pipe, the diameter of the end face, connected with the pile pipe, of the pile tip is larger than the outer diameter of the pile pipe, the pile pipe is divided into an undisturbed soil layer area and a backfill soil layer area from top to bottom, and a plurality of grouting channels are formed in the pipe wall of the pile pipe. The top end of the grouting channel extends to the top face of the pile pipe to form a first slurry inlet, the grouting channel communicates with a plurality of first slurry outlets, the first slurry outlets are formed in the pipe wall, corresponding to the undisturbed soil layer area, of the pile pipe, the pile tip is provided with a second slurry outlet, the second slurry outlet communicates with the inner space of the pile pipe, and the top end of the inner space of the pile pipe serves as the second slurry inlet. A plurality of grouting pipes are fixed to the outer side face, corresponding to the backfill soil layer area, of the pile pipe, the tops of the grouting pipes serve as third slurry inlets, a plurality of third slurry outlets are formed in the pipe walls of the grouting pipes, and the pipe pile main body structure and the composite pipe pile can overcome negative friction generated by backfill soil layer consolidation and guarantee the bearing capacity at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe piles, in particular to a composite pipe pile main body structure and a composite pipe pile. Background Art

[0002] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] As a factory-prefabricated concrete component, pipe piles have the advantages of reliable quality, economical and practical, strong applicability, convenient construction, and short production cycle. In actual engineering, they are mainly used as the foundation structure of buildings and have been widely used. However, in the fill layer, due to the formation settlement caused by the consolidation of the fill, the pile foundation is subjected to negative friction. In severe cases, the building will experience large and uneven settlement, which has a great impact on the safety of the building. At present, the methods for reducing the negative friction caused by fill consolidation mainly include the casing method and applying asphalt coating on the outside of the pile body. Most of the casing methods are to cover the outside of the pipe pile with a casing with a diameter slightly larger than the pile diameter to isolate the pipe pile from the soil. For example, in the patent application CN201811151170.4, a reinforced concrete casing pile is disclosed, which is provided with an outer casing and an inner pile with a large diameter at the bottom and a small diameter at the inside to reduce the negative friction; the casing method and the method of applying asphalt on the outside of the pile body will cause the lateral friction of the pile body to disappear partially, and cannot provide positive friction after the soil consolidation is completed, affecting the long-term bearing performance of the pile foundation. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and to provide a composite pipe pile main structure and a composite pipe pile, which can reduce negative friction without affecting the long-term bearing performance of the pile foundation.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] In the first aspect, an embodiment of the utility model provides a composite pipe pile main body structure, including a pile pipe, a pile tip is coaxially provided at the bottom end of the pile pipe, the diameter of the end face where the pile tip is connected to the pile pipe is larger than the outer diameter of the pile pipe, and the pile pipe is divided into an original soil layer area and a backfill soil layer area from top to bottom, a plurality of grouting channels are provided on the wall of the pile pipe, the top of the grouting channel extends to the top surface of the pile pipe to form a first grouting inlet, the grouting channel is connected with a plurality of first grouting outlets, the first grouting outlet is provided on the wall of the pile pipe corresponding to the original soil layer area, a second grouting outlet is provided on the pile tip, the second grouting outlet is connected with the internal space of the pile pipe, the top of the internal space of the pile pipe serves as the second grouting inlet, a plurality of grouting pipes are fixed on the outer side surface of the pile pipe corresponding to the backfill soil layer area, the top of the grouting pipe serves as a third grouting inlet, and a plurality of third grouting outlets are provided on its wall.

[0007] Optionally, a plurality of blowing and filling pipe placement grooves are provided on the outer side surface of the pile pipe, and the top ends of the blowing and filling pipe placement grooves extend to the top surface of the pile pipe, and the bottom ends extend to the bottom surface of the pile pipe.

[0008] Optionally, the grouting pipes and the blowing and filling pipe placement grooves are alternately arranged along the circumferential direction of the pile pipe, and the grouting channels and the blowing and filling pipe placement grooves are alternately arranged along the circumferential direction of the pile pipe.

[0009] Optionally, a plurality of blowing and filling pipe fixing components distributed along the axial direction of the pile pipe are arranged in the blowing and filling pipe placement groove, and the blowing and filling pipe fixing components are arc-shaped fixing plates, and both ends of the arc-shaped fixing plates are fixedly connected to the pile pipe.

[0010] Optionally, the blowing and filling pipe placement grooves are distributed at equal intervals along the circumferential direction of the pile pipe, and correspondingly, the grouting channels and grouting pipes are distributed at equal intervals along the circumferential direction of the pile pipe.

[0011] Optionally, the multiple first grout outlets connected to the grouting channel are distributed at equal intervals along the axial direction of the pile pipe.

[0012] Optionally, a plurality of third slurry outlets are distributed at equal intervals along the axial direction of the grouting pipe.

[0013] In a second aspect, an embodiment of the utility model provides a composite pipe pile, comprising the composite pipe pile main structure described in the first aspect, wherein particles of a dispersed material are provided above the pile tip and filled between the pile pipe and the wall of the drilled hole.

[0014] Optionally, the bulk material is round gravel.

[0015] Optionally, the internal space of the pile pipe is filled with reinforced concrete.

[0016] The beneficial effects of the above utility model are as follows:

[0017] The composite pipe pile main structure and the composite pipe pile of the utility model have an end face diameter where the pile tip is connected to the pile pipe that is larger than the outer diameter of the pile pipe. Therefore, after drilling, a certain gap is formed between the hole wall and the outer pipe surface of the pile pipe. The gap can be filled with loose granular material by using a filling pipe, thereby avoiding the negative friction resistance to the pile foundation caused by the consolidation of the backfill soil layer. At the same time, since the grouting channel, the first grouting outlet, the second grouting outlet, the grouting pipe and the third grouting outlet are provided, after the entire pipe pile main structure is pressed into the soil and the loose granular material is filled, the grouting reinforcement of the original soil layer outside the pile pipe and the original soil layer below the pipe pile main structure can be carried out. After the backfill soil layer is filled and consolidated, the backfill soil layer can be reinforced by grouting, thereby ensuring the stability of the entire pipe pile structure and improving the overall bearing capacity of the pile foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings in the specification, which constitute a part of the present application, are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute a limitation on the present application.

[0019] Figure 1 This is a front view of the overall structure of Embodiment 1 of the utility model;

[0020] Figure 2 This is a top view of the overall structure of Embodiment 1 of the utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the fixing components of the blowing and filling pipe of Embodiment 1 of the utility model;

[0022] Figure 4 This is a schematic diagram of the filling of round gravel between the pile pipe and the borehole wall in Example 2 of the utility model;

[0023] Figure 5 This is a schematic diagram of the grouting reinforcement area of ​​the original soil layer formed after the first grouting in Example 2 of the utility model;

[0024] Figure 6 This is a schematic diagram of the grouting reinforcement area of ​​the backfill soil layer formed after the secondary grouting in Example 2 of the utility model;

[0025] Among them, 1. pile pipe, 2. pile tip, 3. grouting pipe, 4. first slurry outlet, 5. first slurry inlet, 6. blowing and filling pipe placement groove, 7. blowing and filling pipe fixing component, 8. second slurry inlet, 9. third slurry outlet, 10. second slurry outlet, 11. third slurry inlet, 12. backfill soil layer, 13. original soil layer, 14. rounded gravel particles, 15. original soil layer grouting reinforcement area, 16. backfill soil layer grouting reinforcement area. DETAILED DESCRIPTION

[0026] Example 1

[0027] This embodiment provides a composite pipe pile main structure, such as Figure 1-Figure 2 As shown, it includes a pile pipe 1, a pile tip 2 is provided at the bottom end of the pile pipe 1, and the pile tip 2 is coaxially arranged with the pile pipe 1. The diameter of the end of the pile tip 2 used for connecting with the pile pipe 1 is larger than the outer diameter of the pile pipe 1, so that when the composite pipe pile main structure is lowered, the diameter of the drilled hole formed is larger than the outer diameter of the pile pipe 1, and the bulk material particles can be filled between the pile pipe 1 and the wall of the drilled hole.

[0028] From top to bottom, the pile pipe 1 is divided into two areas, namely a backfill soil layer area and an original soil layer area, wherein the backfill soil layer area is located above the original soil layer area.

[0029] The outer side surface of the pipe wall of the pile pipe 1 is provided with a plurality of blowing and filling pipe placement grooves 6, and the plurality of blowing and filling pipe placement grooves 6 are arranged at equal intervals along the circumferential direction of the pile pipe 1, and the axis of the blowing and filling pipe placement groove 6 is arranged parallel to the axis of the pile pipe 1, and the top end of the blowing and filling pipe placement groove 6 extends to the top surface of the pile pipe 1, and the bottom end extends to the bottom surface of the pile pipe 1.

[0030] Preferably, four blowing and filling pipe placement grooves 6 are provided on the outer side of the pipe wall of the pile pipe 1 .

[0031] Furthermore, a plurality of blowing and filling pipe fixing components 7 are arranged in the blowing and filling pipe placement groove 6, such as Figure 3 As shown, the blowing and filling pipe fixing component 7 adopts an arc-shaped fixing piece. Preferably, the arc-shaped fixing piece adopts an arc-shaped iron sheet, and fixing holes are set at both ends of the arc-shaped iron sheet, and is fixedly connected to the pile pipe through the fixing holes and bolts. The blowing and filling pipe is used to be set between the arc-shaped iron sheet and the bottom groove surface of the blowing and filling pipe placement groove 6. The arc-shaped iron sheet can prevent the blowing and filling pipe from being separated from the blowing and filling pipe placement groove due to the blowing and filling pressure during blowing and filling. It is ensured that the blowing and filling pipe is kept in the blowing and filling pipe placement groove 6 during the blowing and filling process, which is convenient for pulling the blowing and filling pipe upward.

[0032] A plurality of grouting channels are arranged inside the wall of the pile pipe 1, and the grouting channels are arranged along the axial direction of the pile pipe.

[0033] Along the circumferential direction of the pile pipe 1, a plurality of grouting channels and the blowing and filling pipe placement grooves 6 are alternately arranged and the plurality of grouting channels are evenly spaced along the circumferential direction of the pile pipe. In this embodiment, four grouting channels are arranged.

[0034] The top end of the grouting channel extends to the top surface of the pile pipe to form a first grouting port 5, and the bottom end of the grouting channel extends to the original soil layer area of ​​the pile pipe. For each grouting channel, the portion of the grouting channel extending to the original soil layer area is connected to multiple first grouting ports 4. The first grouting ports 4 are opened on the pipe wall corresponding to the original soil layer area of ​​the pile pipe 1 and are arranged along the radial direction of the pile pipe.

[0035] Preferably, the multiple first grout outlets 4 connected to the grouting channel are distributed at equal intervals along the axial direction of the pile pipe.

[0036] The pile tip 2 is provided with a plurality of second slurry outlets 10, which are communicated with the central internal cavity of the pile pipe. The central internal cavity of the pile pipe serves as a second grouting channel, and a second slurry inlet 8 is formed at its top. The second slurry outlet 10 is communicated with the second grouting channel.

[0037] A plurality of grouting pipes 3 are fixed to the outer side of the pipe wall of the pile pipe 1 corresponding to the backfill soil layer area. The grouting pipes 3 are fixedly connected to the pile pipe 1 by fixing bolts, and the axis of the grouting pipe 3 is parallel to the axis of the pile pipe.

[0038] The top end of the grouting pipe 3 serves as the third slurry inlet 11, and its bottom end is blocked. The top end surface of the grouting pipe 3 is located at a set position below the top surface of the pile pipe, that is, the top end surface of the grouting pipe 3 is lower than the top end surface of the pile pipe by a set distance. A plurality of third slurry outlets 9 are arranged on the wall of the grouting pipe 3. Preferably, the plurality of third slurry outlets 9 are equally spaced along the axis of the grouting pipe 3.

[0039] Example 2

[0040] This embodiment provides a composite pipe pile, including the composite pipe pile main structure described in Embodiment 1, wherein particles of a dispersed material filling the space between the outer surface of the pile pipe and the wall of the drilled hole are arranged above the pile tip 2 .

[0041] Preferably, the bulk material particles are round gravel particles 14. The round gravel particles 14 are filled in the space above the pile tip 2 and between the outer surface of the pile pipe 1 and the borehole wall by a blowing and filling pipe.

[0042] Furthermore, the internal space of the pile pipe 1 is filled with reinforced concrete to improve the bearing capacity of the entire composite pipe pile.

[0043] The construction method of the composite pipe pile of this embodiment comprises the following steps:

[0044] Step 1: Construction preparation work. Before the construction starts, the pile pipe 1, pile tip 2, and grouting pipe 3 are prefabricated in the factory. The pile pipe 1 is equipped with a grouting channel, a first grouting outlet 4, a blowing and filling pipe placement groove 6, and a second grouting outlet 10. The third grouting outlet 9 is drilled on the pipe wall of the grouting pipe 3. The grouting pipe 3 is fixed to the upper half of the pile pipe 1 by existing mechanical anchoring methods, and its top end is set below the top surface of the pile pipe by a distance.

[0045] Step 2: After the pile driver is in place, centered and straightened, the pile is hoisted according to the matching length. The construction personnel carry out the verticality inspection and debugging of the pile pipe, and adjust the verticality of the pile frame of the pile driver to keep it in an axial compression state during the construction process. If there is any deviation, adjust it in time to avoid pile top crushing and broken piles.

[0046] Step 3: Pipe pile driving and gravel filling

[0047] Specifically, Figure 4 As shown, the main structure of the composite pipe pile is hoisted into place and inserted into the ground with a verticality requirement. A filling pipe is placed in the filling pipe placement groove 6 of the pile pipe 1, and the filling pipe is extended to the bottom of the pile pipe 1. The pile is pressed by a pile driver so that the main structure of the composite pipe pile is pressed into the soil. While the pile is pressed, round gravel particles 14 are blown into the gap between the pile pipe 1 and the wall of the borehole through the filling pipe, and the filling pipe is gradually pulled outwards as the main structure of the composite pipe pile is pressed in. The filling of the round gravel particles 14 avoids the negative friction resistance to the pile foundation caused by the consolidation of the backfill soil layer 12.

[0048] Step 4: Grouting of the original soil layer

[0049] like Figure 5 As shown, after the main structure of the composite pipe pile is pressed into the soil layer and the filling is completed, the original soil layer area of ​​the pile pipe 1 is pressed into the original soil layer 13, and the backfill soil layer area is located at the backfill soil layer 12. A steel cage is placed in the pile pipe 1, and the original soil layer 13 is first grouted through the first grout inlet 5 and the second grout inlet 8. During the first grouting, the slurry passes through the first grout outlet 4 and then passes through the round gravel to diffuse into the original soil layer 13 around the pile pipe 1. The slurry diffuses into the original soil layer 13 below the pile tip 2 through the second grout outlet 10, forming an original soil layer grouting reinforcement area 15. At the same time, a steel cage is placed in the pile pipe to form reinforced concrete filled in the pile pipe 1, thereby improving the overall stability of the pile foundation. The construction of the composite pipe pile is now completed.

[0050] Step 5: Construct multiple composite pipe piles in sequence in the same way according to the design requirements. After all composite pipe piles are constructed and the first grouting is completed, the foundation is erected. When the foundation is erected, space should be reserved for the slurry delivery pipe to deliver concrete slurry to the third slurry inlet at the top of the grouting pipe 3.

[0051] like Figure 6 As shown, after the backfill soil layer 12 is solidified, secondary grouting is performed to reinforce the backfill soil layer 12 around the pile pipe 1 through the grouting pipe 3 and the third grouting outlet 9, forming a backfill soil layer grouting reinforcement area 16, further enhancing the stability of the composite pipe pile and improving the bearing capacity of the pile foundation.

[0052] The composite pipe pile of the present embodiment has a grouting channel, a first grouting outlet 4, a second grouting outlet 10, a grouting pipe 3 and a third grouting outlet 9. After the entire pipe pile main structure is pressed into the soil and the loose granular material is blown in, the original soil layer 13 outside the pile pipe and the original soil layer 13 below the pipe pile main structure can be grout-reinforced. After the backfill soil layer 12 is filled and consolidated, the backfill soil layer 12 can be grout-reinforced, thereby ensuring the stability of the entire pipe pile structure, improving the overall bearing capacity of the pile foundation, and overcoming the defects of the casing method and the method of applying asphalt on the pile foundation surface.

[0053] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. A composite pipe pile main structure, characterized in that: The utility model comprises a pile pipe, the bottom end of which is coaxially provided with a pile tip, the end face diameter of which the pile tip is connected to the pile pipe is larger than the outer diameter of the pile pipe, and the pile pipe is divided into an original soil layer area and a backfill soil layer area from top to bottom, the wall of the pile pipe is provided with a plurality of grouting channels, the top end of the grouting channel extends to the top surface of the pile pipe to form a first grouting inlet, the grouting channel is connected with a plurality of first grouting outlets, the first grouting outlets are arranged on the wall of the pile pipe corresponding to the original soil layer area, the pile tip is provided with a second grouting outlet, the second grouting outlet is connected with the internal space of the pile pipe, the top end of the internal space of the pile pipe serves as the second grouting inlet, a plurality of grouting pipes are fixed on the outer side surface of the pile pipe corresponding to the backfill soil layer area, the top of the grouting pipe serves as a third grouting inlet, and its wall is provided with a plurality of third grouting outlets.

2. A composite pipe pile main structure as claimed in claim 1, characterized in that: The outer side surface of the pile pipe is provided with a plurality of blowing and filling pipe placing grooves, the top ends of the blowing and filling pipe placing grooves extend to the top surface of the pile pipe, and the bottom ends extend to the bottom surface of the pile pipe.

3. A composite pipe pile main structure as claimed in claim 2, characterized in that: The grouting pipes and the blowing and filling pipe placement grooves are alternately arranged along the circumferential direction of the pile pipe, and the grouting channels and the blowing and filling pipe placement grooves are alternately arranged along the circumferential direction of the pile pipe.

4. A composite pipe pile main structure as claimed in claim 3, characterized in that: The blowing and filling pipe placement grooves are evenly spaced along the annular direction of the pile pipe, and correspondingly, the grouting channels and grouting pipes are evenly spaced along the annular direction of the pile pipe.

5. A composite pipe pile main structure as claimed in claim 2, characterized in that: A plurality of blowing and filling pipe fixing components distributed along the axial direction of the pile pipe are arranged in the blowing and filling pipe placement groove. The blowing and filling pipe fixing components are arc-shaped fixing pieces, and both ends of the arc-shaped fixing pieces are fixedly connected to the pile pipe.

6. The composite pipe pile main structure according to claim 1, characterized in that: The plurality of first grout outlets connected to the grouting channel are distributed at equal intervals along the axial direction of the pile pipe.

7. The composite pipe pile main structure according to claim 1, characterized in that: The plurality of third slurry outlets are evenly spaced along the axial direction of the grouting pipe.

8. A composite pipe pile, characterized in that: The composite pipe pile main body structure comprises the composite pipe pile main body structure according to any one of claims 1 to 7, wherein the top of the pile tip is provided with particles of dispersed material filled between the pile pipe and the wall of the drilled hole.

9. A composite pipe pile as claimed in claim 8, characterized in that: The bulk material is round gravel.

10. The composite pipe pile according to claim 8, characterized in that: The inner space of the pile pipe is filled with reinforced concrete.

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