Rapid construction system for secant piles of foundation pit

Abstract

The utility model relates to a foundation pit secant pile rapid construction system which comprises a meat pile, a plain pile and a double-drill-bit drilling machine, the meat pile and the plain pile are integrally poured and connected in a secant mode, and a reinforcement cage is further arranged in the meat pile. The double-drill-bit drilling machine comprises a power box and drill rods, the distance between the drill rods is matched with the distance between the adjacent meat piles and plain piles, and the double-drill-bit drilling machine is used for simultaneous hole forming of the meat piles and the plain piles. The double-drill-bit drilling machine has the advantages that the distance between the two drill rods arranged in the double-drill-bit drilling machine is matched with the distance between the meat pile and the plain pile adjacent to the meat pile, hole forming, pouring and pile forming are conducted on the meat pile and the plain pile at the same time, and the construction speed is high; by pouring the reinforced piles and the plain piles at the same time, the overlapping frequency of meshing of the reinforced piles and the plain piles is reduced, and the foundation pit water seepage risk is reduced; the concrete is super-retarding concrete and is suitable for construction of soft soil and common non-hard soil layer enclosure structures.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit support, and in particular includes a rapid construction system for interlocking piles in foundation pits. Background Technology

[0002] The construction of interlocking piles in the foundation pit is an important part of the foundation pit retaining construction. The traditional interlocking pile process involves the separate construction of plain piles and solid piles, which are cast into piles separately, resulting in a long construction period. Each plain pile and solid pile needs to be interlocked twice, resulting in many joints in the retaining structure, which is not conducive to the water stoppage of the foundation pit and is prone to leakage at the joints.

[0003] There is an urgent need to develop a rapid construction system for interlocking piles in foundation pits that is fast to construct, has a short construction period, and good water-stopping performance, in order to overcome the above problems. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a rapid construction system for interlocking piles in foundation pits.

[0005] This rapid construction system for interlocking piles in foundation pits includes: solid piles, plain piles, and a dual-drill-bit drilling rig. The solid and plain piles are cast as a whole and interlocked. The solid piles also contain a steel cage.

[0006] The dual-bit drilling rig includes a power box and drill rods. The spacing between the drill rods is matched with the spacing between adjacent solid and plain piles, which is used to drill holes for solid and plain piles at the same time.

[0007] As a preferred option, the steel cage inside the solid pile also interlocks with the plain pile.

[0008] Preferably, the middle height area of ​​the drill pipe is interconnected by a connector, the drill pipe passes through the connector, and is rotatably connected to the connector.

[0009] Preferably, the bottom end of the drill pipe is provided with several layers of rotating blades, and the heights of the rotating blades between adjacent drill pipes are staggered.

[0010] Preferably, the concrete used for casting both solid and plain piles is ultra-slow-setting concrete.

[0011] The beneficial effects of this utility model are:

[0012] 1) This utility model proposes a rapid construction system for interlocking piles in foundation pits. The spacing between the two drill rods in the dual-drill-bit drilling rig is matched with the spacing between adjacent solid and plain piles. The solid and plain piles are drilled, poured, and piled simultaneously, resulting in fast construction speed.

[0013] 2) This utility model reduces the number of overlaps between solid and plain piles by simultaneously casting solid and plain piles, thereby reducing the risk of water seepage in the foundation pit.

[0014] 3) The concrete used in this utility model for pouring solid and plain piles is ultra-slow-setting concrete, which is suitable for the construction of retaining structures in soft soil and general non-hard soil layers. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the cross-section of the interlocking piles in the foundation pit;

[0016] Figure 2 This is a schematic diagram of an underground dual-drill-bit drilling rig.

[0017] Explanation of reference numerals in the attached diagram: 1. Plain pile; 2. Reinforcing cage; 3. Ultra-slow-setting concrete; 4. Power box; 5. Rotating blade; 6. Detailed Implementation

[0018] The present invention will be further described below with reference to embodiments. The description of the embodiments below is only for the purpose of helping to understand the present invention. It should be noted that, for those skilled in the art, several modifications can be made to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0019] As one embodiment, this rapid construction system for interlocking piles in foundation pits includes: a solid pile 1, a plain pile 2, and a dual-drill-bit rig. The solid pile 1 and the plain pile 2 are integrally cast and interlocked. A reinforcing cage 3 is also installed inside the solid pile 1; the reinforcing cage 3 inside the solid pile 1 also interlocks with the plain pile 2. In this embodiment, the diameters of the solid pile 1 and the plain pile 2 are... The pile is 15m long, and the steel cage has 3 specifications of 9m / section.

[0020] like Figure 1 As shown, adjacent solid pile 1 and solid pile 2 are constructed simultaneously in a single span, that is, the two drill rods of the double drill bit rig are drilled at the same time, and they can also be poured at the same time in the subsequent process. Therefore, the construction time of the interlocking pile process is greatly shortened and the number of joints is reduced by at least half, which greatly improves the water-stopping performance of the interlocking pile after pouring.

[0021] The middle section of the drill rod is connected to each other by connectors. The drill rod passes through the connectors and is rotatably connected to them. This is to enhance the stability of the drill rod when it rotates, ensure the stability of the spacing between adjacent solid piles 1 and solid piles 2, and ensure the quality of the interlocking piles.

[0022] The concrete used for pouring the solid pile 1 and the plain pile 2 is ultra-slow-setting concrete 4, which further facilitates the interlocking connection of piles of different widths even if they are poured one after the other.

[0023] Example 2

[0024] As another embodiment, this second embodiment proposes a more specific rapid construction system for interlocking piles in foundation pits, based on the first embodiment, using a dual-drill-bit rig such as... Figure 2 As shown:

[0025] The dual-drill-bit rig includes a power unit 5 and two drill rods. The spacing between the drill rods matches the spacing between adjacent solid piles 1 and solid piles 2, allowing for simultaneous drilling of solid piles 1 and solid piles 2. Several layers of rotating blades 6 are located at the bottom of the drill rods. The power head 5 drives the rotating blades 6 to drill holes underground. The rotating blades 6 on adjacent drill rods are staggered in height and rotate simultaneously, preventing interference between the rotating blades 6 on different drill rods and enabling simultaneous drilling of the holes where solid piles 1 and solid piles 2 interlock.

[0026] Using this rapid construction system for interlocking piles in foundation pits, simultaneously constructing both solid and composite piles, can significantly accelerate the construction speed while reducing the number of overlaps between solid and composite piles, thus lowering the risk of foundation pit seepage. The specific steps include:

[0027] Step 1: Level the site, mark the pile positions, and position the pile driver;

[0028] Step 2: Using an improved dual-bit drilling rig, turn on the power box 5 and drive the rotating blades 6 to simultaneously form holes for mud wall protection on adjacent piles 1 and plain piles 2 in the same set.

[0029] Step 3: Clean the hole and lower the reinforcing cage into the pile.

[0030] Step 4: Insert the catheter and perform a second cleaning of the pores;

[0031] Step 5: Pour in super-retarded concrete 4 and pull out the guide pipe; the initial setting time of super-retarded concrete 4 shall not be less than 72 hours and the concrete strength shall be C30.

[0032] Step 6: Repeat the construction of the next set of interlocking piles 1 and 2.

[0033] It should be noted that the parts in this embodiment that are the same as or similar to those in Embodiment 1 can be referred to each other, and will not be repeated in this application.

[0034] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

Claims

1. A rapid construction system for interlocking piles in foundation pits, characterized in that, include: The project includes solid piles, plain piles, and a double-drill-bit drilling rig. Solid and plain piles are cast in one piece and interlocked. The solid piles also contain a steel cage. The dual-drill-bit drilling rig includes a power box and drill rods. The spacing between the two drill rods is matched with the spacing between adjacent solid and plain piles, which is used to drill holes for solid and plain piles at the same time. The bottom of the drill pipe is equipped with several layers of rotating blades, and the rotating blades between adjacent drill pipes are staggered in height.

2. The rapid construction system for interlocking piles in foundation pits according to claim 1, characterized in that, The steel cage inside the solid pile also interlocks with the plain pile.

3. The rapid construction system for interlocking piles in foundation pits according to claim 1, characterized in that, The drill pipes are interconnected in the middle height area by connectors, the drill pipes pass through the connectors and are rotatably connected to the connectors.

4. The rapid construction system for interlocking piles in foundation pits according to claim 1, characterized in that, The concrete used for pouring solid and plain piles is ultra-slow-setting concrete.

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