Pile foundation equipment applied to complex foundation and pile forming construction method

Abstract

The invention discloses pile foundation equipment applied to a complex foundation and a pile forming construction method, belongs to the technical field of rotary excavating pile construction, and aims to solve the technical problem that in the prior art, a valve pile shoe cannot normally sink as when acting on a soft soil layer under the vibration force of an upper hammer. The device comprises a lifting rack, an inner barrel, a twist drill and an outer barrel, the outer cylinder is movably connected with the lifting rack through an outer cylinder lifting mechanism; the twist drill is movably connected with the lifting rack through a twist drill lifting mechanism; the inner cylinder is connected with the twist drill lifting mechanism through an inner cylinder hydraulic separation mechanism; and the inner cylinder, the twist drill and the outer cylinder are concentrically arranged. According to the pile foundation equipment applied to the complex foundation and the pile forming construction method, operation is easy, construction is convenient and fast, and construction pile forming of the complex stratum can be achieved while the construction efficiency of the original working condition can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of rotary pile construction, and in particular to a pile foundation device and a pile construction method applied to a complex foundation. Background Art

[0002] In view of the soft soil covering layer widely distributed in my country, PCC piles are mainly piled by using vibration sinking molds, automatic soil discharge, and on-site concrete pouring above the soft soil covering layer. The specific design steps are as follows: first, relying on the vibration force of the hammer head on the upper part of the sinking cavity, the annular cavity formed by the inner and outer double-layer casing is driven into the predetermined design depth under the protection of the flap pile shoe; then concrete is poured on-site in the cavity, and the pipe is pulled out while vibrating, and finally a concrete pipe pile is formed in the annular cavity. However, the soft soil covering layer is complex, including various complex soil layers in engineering construction. Especially when cast-in-place concrete pipe piles are promoted and applied from the eastern soft soil area to the central and western regions, they often encounter hard and thick soil layers. The traditional sinking pipe pouring pile method is difficult to penetrate the hard soil layer. This method is not very applicable. It is necessary to research and develop equipment and upgrade it on the basis of retaining the original core technology to ensure that PCC piles can be normally constructed under various complex operating conditions.

[0003] At present, when dealing with hard and thick soil layers, the original flap pile shoe cannot sink normally under the vibration force of the upper hammer head as it does when acting on soft soil layers. Thick soil layers or rock layers will hinder the vibration penetration of the flap pile shoe, making the pile body bearing capacity unable to meet the design requirements, causing adverse effects on the pile formation process. In the past pile body construction, spiral drilling excavation was a more common pile body excavation method, often used in the process of solid pile sinking excavation. The spiral drill can be cleverly used in the excavation of solid piles, cast-in-place concrete piles, gravel piles in hard soil layers, and the whole pile formation process of the pile body is generally formed by spiral drilling excavation, lowering the steel cage, and pouring concrete. Nowadays, the technology of applying the spiral drilling circular rotary drilling system for excavable hard soil layers to pipe piles is still rare, and if soft soil layers are encountered during the process of spiral drilling hollow solid piles, shrinkage holes and collapse holes are still prone to occur. The development of this technology, which combines spiral drilling with the original PCC pile-making equipment, has a very broad application prospect. It can expand the pipe piles from a single soft soil foundation to a complex foundation containing hard soil or rock interlayers, and can also realize a convenient and efficient pile-making process of circular rotary drilling - pouring concrete - one-time pile-making. Summary of the invention

[0004] The purpose of the present invention is to provide a pile foundation equipment and a pile forming method for use in complex foundations, so as to solve the technical problem in the prior art that the valve pile shoe cannot sink normally under the vibration force of the upper hammer head as when it acts on a soft soil layer.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention provides a pile foundation equipment used in a complex foundation, comprising a lifting frame, an inner cylinder, an auger and an outer cylinder; the outer cylinder is movably connected to the lifting frame through an outer cylinder lifting mechanism; the auger is movably connected to the lifting frame through an auger lifting mechanism; the inner cylinder is connected to the auger lifting mechanism through an inner cylinder hydraulic separation mechanism;

[0007] The inner cylinder, the auger and the outer cylinder are concentrically arranged.

[0008] Optionally or preferably, the outer cylinder lifting mechanism comprises an outer cylinder lifter and an outer cylinder fixing clamp;

[0009] The outer cylinder lifter is used to connect the outer cylinder and the lift frame, and the outer cylinder lifter is slidably connected to the lift frame;

[0010] The outer cylinder is fixed on the outer cylinder lifter by the outer cylinder fixing clamp.

[0011] Optionally or preferably, the auger lifting mechanism comprises an auger lifter and an auger fixing clamp;

[0012] The inner cylinder hydraulic separation mechanism comprises an inner cylinder separation hydraulic cylinder and an inner cylinder fixing clamp;

[0013] The inner cylinder separation hydraulic cylinder is fixedly connected to the auger lifter, and the inner cylinder is connected to the inner cylinder separation hydraulic cylinder via the inner cylinder fixing clamp;

[0014] The auger is fixed to the lower part of the inner tube separation hydraulic cylinder through the auger fixing clamp.

[0015] A pile construction method in a complex foundation comprises the following steps:

[0016] S1. Equipment assembly and determination of target pile location:

[0017] S2. Auger excavation and sinking:

[0018] S3, inner tube fixed;

[0019] S4, auger extraction:

[0020] S5. Casting and lifting.

[0021] Optionally or preferably, the method for positioning and assembling the equipment in S1 is: positioning the target pile-forming position, assembling various fixing parts, so that the outer cylinder fixing clamp, the auger fixing clamp and the inner cylinder fixing clamp are all in a completely fixed state.

[0022] Optionally or preferably, the method of spiral drilling excavation and sinking in S2 comprises the following steps:

[0023] S21, open the inner cylinder separation hydraulic cylinder to put the auger in a rotating development state, and at the same time press down the auger lifter and the outer cylinder lifter; so that the inner cylinder, auger and outer cylinder are in a continuous sinking state;

[0024] S22, after the staged pile sinking is completed, the outer tube fixing clamp, the auger fixing clamp and the inner tube fixing clamp are released, and the corresponding auger, inner tube and outer tube are butt-jointed and fixed, and the outer tube lifter, auger lifter and the overlapped auger, inner tube and outer tube are re-fixed;

[0025] S23, restart and drill down after the safety fixation detection is correct;

[0026] S24, repeat S21 to S23 until the excavation reaches the target depth of the pile body.

[0027] Optionally or preferably, the method for fixing the inner cylinder in S3 is: open the inner cylinder fixing clamp to implant the inner cylinder into the soil for fixing, and keep the outer cylinder lifter fixed.

[0028] Optionally or preferably, the method for extracting the auger in S4 is: lifting the auger lifter, extracting the auger from between the inner tube and the outer tube, and taking out the excavated loose soil, so that there is a soilless vacuum state between the inner tube and the outer tube.

[0029] Optionally or preferably, the method for pouring and lifting in S5 is: after completing the subsequent concrete pouring work, after vibration, the inner tube and the outer tube are simultaneously lifted out of the soil layer by the outer tube lifter and the auger lifter to complete the pouring of the pile body at the target position.

[0030] Based on the above technical solution, the present invention can at least produce the following technical effects:

[0031] The pile foundation equipment provided by the present invention is applied to complex foundations. By arranging the inner cylinder, the spiral drill and the outer cylinder concentrically, the equal diameter pouring of the pile body is realized, and the pile quality is ensured. After being equipped with the spiral drill equipment, the original soft soil layer penetration work is not affected, and the pile speed and pile quality of the original working condition can even be completed more efficiently. Moreover, the original PCC pile can be upgraded to complete the excavation of the hard soil layer while ensuring that the positions of the inner and outer cylinders remain unchanged.

[0032] The pile construction method in a complex foundation provided by the present invention is simple to operate and convenient to construct, and can improve the construction efficiency of the original working conditions while realizing pile construction in complex strata. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of the pile foundation equipment of the present invention applied to a complex foundation;

[0034] Figure 2 It is a flow chart of the pile construction method in a complex foundation of the present invention;

[0035] Figure 3 It is a construction schematic diagram of step S2 in the pile construction method in a complex foundation of the present invention;

[0036] Figure 4 This is a construction diagram of step S3 in the pile construction method in a complex foundation of the present invention. Figure 1 ;

[0037] Figure 5 This is a construction diagram of step S3 in the pile construction method in a complex foundation of the present invention. Figure 2 ;

[0038] Figure 6 It is a construction schematic diagram of step S4 in the pile construction method in a complex foundation of the present invention;

[0039] Figure 7 It is a construction schematic diagram of step S5 in the pile construction method in a complex foundation of the present invention.

[0040] In the figure: 1. lifting frame; 2. auger; 3. inner cylinder; 4. outer cylinder; 5. outer cylinder lifting mechanism; 51. outer cylinder lifter; 52. outer cylinder fixing clamp; 6. auger lifting mechanism; 61. auger lifter; 62. auger fixing clamp; 7. inner cylinder hydraulic separation mechanism; 71. inner cylinder separation hydraulic cylinder; 72. inner cylinder fixing clamp. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work belong to the scope of protection of the present invention.

[0042] Embodiment 1

[0043] See also Figure 1 A pile foundation device used in complex foundations includes a lifting frame 1, and a concentrically arranged inner cylinder 3, an auger 2 and an outer cylinder 4.

[0044] In this embodiment, the outer cylinder 4 is slidably connected to the lifting frame 1 through the outer cylinder lifting mechanism 5; specifically, the outer cylinder lifting mechanism 5 includes an outer cylinder lifter 51 and an outer cylinder fixing clamp 52; wherein the outer cylinder lifter 51 is used to connect the outer cylinder 4 and the lifting frame 1, and the outer cylinder 4 is fixed on the outer cylinder lifter 51 through the outer cylinder fixing clamp 52.

[0045] In this embodiment, the auger 2 is slidably connected to the lifting frame 1 through the auger lifting mechanism 6; specifically, the auger lifting mechanism 6 includes an auger lifter 61 and an auger fixing clamp 62.

[0046] The inner cylinder 3 is connected to the auger lifting mechanism 6 through the inner cylinder hydraulic separation mechanism 7. Specifically, the inner cylinder hydraulic separation mechanism 7 includes an inner cylinder separation hydraulic cylinder 71 and an inner cylinder fixing clamp 72; the inner cylinder separation hydraulic cylinder 71 is fixedly connected to the auger lifter 61, and the inner cylinder 3 is connected to the inner cylinder separation hydraulic cylinder 71 through the inner cylinder fixing clamp 72; the auger 2 is fixed to the lower part of the inner cylinder separation hydraulic cylinder 71 through the auger fixing clamp 62.

[0047] It can be understood that in this embodiment, the pile foundation equipment also includes a rotary drilling rig body, and the rotary drilling rig body includes a walking device and a lifting device; the walking device is used to meet the basic movement of the drilling rig in the site. The lifting device is used to control the up and down movement of the three-tube concentric device and the rotary drilling during the rotary drilling process.

[0048] Embodiment 2

[0049] See also Figures 2 to 7 This embodiment provides a method for pile construction in a complex foundation, which performs pile foundation construction based on the pile foundation equipment provided in the first embodiment, including the following steps:

[0050] S1. Equipment assembly and determination of target pile location:

[0051] In this embodiment, the method for assembling the above equipment and determining the target pile position is: locate the target pile position, assemble various fixing parts, and make the outer cylinder fixing clamp 52, the spiral drill fixing clamp 62 and the inner cylinder fixing clamp 72 all in a completely fixed state.

[0052] S2, auger 2 excavation sinking:

[0053] In this embodiment, the method for excavating and sinking the auger 2 comprises the following steps:

[0054] S21, open the inner cylinder separation hydraulic cylinder 71, so that the auger 2 is in a rotating development state, and at the same time press down the auger lifter 61 and the outer cylinder lifter 51; so that the inner cylinder 3, the auger 2 and the outer cylinder 4 are in a continuous sinking state;

[0055] S22, after the staged pile driving is completed, the outer cylinder fixing clamp 52, the auger fixing clamp 62 and the inner cylinder fixing clamp 72 are released, and the corresponding auger 2, inner cylinder 3 and outer cylinder 4 are docked and fixed, and the outer cylinder lifter 51, the auger lifter 61 and the overlapped auger 2, inner cylinder 3 and outer cylinder 4 are re-fixed;

[0056] S23, restart and drill down after the safety fixation detection is correct;

[0057] S24, repeat S21 to S23 until the excavation reaches the target depth of the pile body.

[0058] S3, inner tube 3 is fixed;

[0059] In this embodiment, the method for fixing the inner cylinder 3 is as follows: the inner cylinder fixing clamp 72 is opened to implant the inner cylinder 3 into the soil for fixing, and the outer cylinder lifter 51 is kept fixed.

[0060] S4, auger 2 extraction:

[0061] In this embodiment, the method for extracting the auger 2 is specifically as follows: lifting the auger lifter 61, extracting the auger 2 from between the inner tube 3 and the outer tube 4, and taking out the excavated loose soil, so that there is a soilless vacuum state between the inner tube 3 and the outer tube 4.

[0062] S5. Casting and lifting.

[0063] In this embodiment, the specific method of the above-mentioned pouring and lifting is: after completing the subsequent concrete pouring work, after vibration, the inner tube 3 and the outer tube 4 are simultaneously lifted out of the soil layer through the outer tube lifter 51 and the spiral drill lifter 61 to complete the pile body pouring at the target position.

[0064] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" 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 components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0065] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pile foundation equipment used in complex foundations, characterized in that: The invention comprises a lifting frame (1), an inner cylinder (3), an auger (2) and an outer cylinder (4); the outer cylinder (4) is movably connected to the lifting frame (1) via an outer cylinder lifting mechanism (5); the auger (2) is movably connected to the lifting frame (1) via an auger lifting mechanism (6); the inner cylinder (3) is connected to the auger lifting mechanism (6) via an inner cylinder hydraulic separation mechanism (7); The inner cylinder (3), the auger (2) and the outer cylinder (4) are concentrically arranged.

2. The pile foundation equipment used in complex foundation according to claim 1, characterized in that: The outer cylinder lifting mechanism (5) comprises an outer cylinder lifter (51) and an outer cylinder fixing clamp (52); The outer cylinder lifter (51) is used to connect the outer cylinder (4) and the lift frame (1), and the outer cylinder lifter (51) is slidably connected to the lift frame (1); The outer cylinder (4) is fixed to the outer cylinder lifter (51) via the outer cylinder fixing clamp (52).

3. The pile foundation equipment used in complex foundation according to claim 1, characterized in that: The auger lifting mechanism (6) comprises an auger lifter (61) and an auger fixing clamp (62); The inner cylinder hydraulic separation mechanism (7) comprises an inner cylinder separation hydraulic cylinder (71) and an inner cylinder fixing clamp (72); The inner cylinder separation hydraulic cylinder (71) is fixedly connected to the auger lifter (61), and the inner cylinder (3) is connected to the inner cylinder separation hydraulic cylinder (71) via the inner cylinder fixing clamp (72); The auger (2) is fixed to the lower part of the inner tube separation hydraulic cylinder (71) by means of the auger fixing clamp (62).

4. A pile construction method in a complex foundation, characterized in that: The construction method of pile formation using the pile foundation equipment described in claims 1 to 3 comprises the following steps: S1. Equipment assembly and determination of target pile location: S2, auger (2) excavation and sinking: S3, inner tube (3) is fixed; S4. Extraction of auger (2): S5. Casting and lifting.

5. The method for pile construction in a complex foundation according to claim 4, characterized in that: The method for assembling the equipment and determining the target pile-forming position in S1 is: locating the target pile-forming position, assembling various fixing parts, and making the outer cylinder fixing clamp (52), the spiral drill fixing clamp (62) and the inner cylinder fixing clamp (72) all in a completely fixed state.

6. The method for pile construction in a complex foundation according to claim 4, characterized in that: The method for excavating and sinking the spiral drill (2) in S2 comprises the following steps: S21, opening the inner cylinder separation hydraulic cylinder (71) to put the auger (2) into a rotating development state, and at the same time pressing down the auger lifter (61) and the outer cylinder lifter (51); so that the inner cylinder (3), the auger (2) and the outer cylinder (4) are in a continuous sinking state; S22, after the staged pile sinking is completed, the outer cylinder fixing clamp (52), the auger fixing clamp (62) and the inner cylinder fixing clamp (72) are released, and the corresponding auger (2), the inner cylinder (3) and the outer cylinder (4) are docked and fixed, and the outer cylinder lifter (51), the auger lifter (61) and the overlapped auger (2), the inner cylinder (3) and the outer cylinder (4) are re-fixed; S23, restart and drill down after the safety fixation detection is correct; S24, repeat S21 to S23 until the excavation reaches the target depth of the pile body.

7. The method for pile construction in a complex foundation according to claim 4, characterized in that: The method for fixing the inner cylinder (3) in S3 is: opening the inner cylinder fixing clamp (72) to implant the inner cylinder (3) into the soil and fix it, and keeping the outer cylinder lifter (51) fixed.

8. The method for pile construction in a complex foundation according to claim 4, characterized in that: The method for extracting the auger (2) in S4 is as follows: lifting the auger lifter (61), extracting the auger (2) from between the inner cylinder (3) and the outer cylinder (4), and taking out the excavated loose soil, so that the space between the inner cylinder (3) and the outer cylinder (4) is in a soil-free vacuum state.

9. The method for pile construction in a complex foundation according to claim 4, characterized in that: The method for pouring and lifting in S5 is: after completing the subsequent concrete pouring work, after vibration, the inner tube (3) and the outer tube (4) are simultaneously lifted out of the soil layer by the outer tube lifter (51) and the auger lifter (61), thereby completing the pouring of the pile body at the target position.

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