Special pipe pile grouting expanded head pile forming pipe for prestressed concrete water jet cutter

Abstract

The utility model relates to a pipe pile grouting expanded head pile forming pipe special for a prestressed concrete water jet cutter, and belongs to the field of pipe pile construction. The large-head concrete block is integrally connected with the lower end of the tubular pile body and is in an irregular shape, the tubular pile body sequentially comprises a pile cap, a plurality of pipe joints and an inverted-cone-shaped pile head from top to bottom, the tubular pile body is provided with at least one high-pressure water or cement paste channel in the axial direction of the tubular pile body, and the pile head is provided with a material water hole communicated with the high-pressure water or cement paste channel. During construction, even if a special stratum is encountered, the hard stratum is impacted through the high-pressure water jet cutter, and static pressure or hammering is matched, so that the problem that an existing pipe pile is difficult to descend is solved. When the designed elevation is reached, guniting is carried out through high-pressure water or a cement paste channel in the pipe pile body, and a sphere-like expanded head is formed at the bottom of the pipe pile; the bearing capacity of a single pile can be improved, settlement of the pile body is limited, local displacement of the pile body is eliminated, and the anti-floating effect of the pile body is achieved.

Description

Technical Field

[0001] This invention relates to the field of vibratory compaction construction technology, specifically to a prestressed concrete water jet special pipe pile grouting enlarged head pile forming pipe. Background Technology

[0002] Pipe piles are foundation engineering components made of steel pipes and concrete.

[0003] Pipe piles are classified into post-tensioned prestressed pipe piles and pre-tensioned prestressed pipe piles, as well as prestressed concrete pipe piles (PC pipe piles), prestressed concrete thin-walled pipe piles (PTC pipe piles), and high-strength prestressed concrete pipe piles (PHC pipe piles).

[0004] Pipe piles are classified into prestressed concrete pipe piles (PC pipe piles), prestressed concrete thin-walled pipe piles (PTC pipe piles), and prestressed high-strength concrete pipe piles (PHC pipe piles) according to their concrete strength grade and wall thickness. The concrete strength of PC piles shall not be lower than C50, the strength grade of PTC pipe piles shall not be lower than C60, and the concrete strength grade of PHC piles shall not be lower than C80.

[0005] The following problems exist with existing pipe piles and their construction process:

[0006] In special geological conditions, it is difficult for pipe piles to descend. Continuous static pressure and hammering may cause pile tip or pile body fracture, joint cracking, deformation, pile breakage, and pile foundation failure. In special geological conditions, pilot hole equipment is required, and pile formation is difficult.

[0007] The bearing capacity of the pile tip bearing layer is limited, and the pull-out resistance of the pile is tested when construction is carried out in the same area.

[0008] After the pipe piles are installed, they may experience vertical displacement after being left for a period of time.

[0009] During pile construction, there is a soil displacement effect, which is especially problematic during pile group construction or large-diameter pile construction. This can easily cause the ground to rise and bulge, and the adjacent pipe piles to float, break, or shift.

[0010] This invention can solve the above-mentioned problems and greatly improve the bearing capacity of a single pipe pile, thus playing a role in the environmental protection of groundwater. Summary of the Invention

[0011] This invention addresses the shortcomings of existing technologies by providing a special grouting enlarged head for prestressed concrete waterjet-driven pipe piles, the technical solution of which is as follows:

[0012] The prestressed concrete water jet grouting enlarged head pile forming pipe material includes a pipe pile body and an irregularly shaped large-head concrete block integrally connected to the lower end of the pipe pile body. The pipe pile body includes, from top to bottom, a pile cap, multiple pipe sections, and an inverted conical pile head, with the pile head located inside the large-head concrete block. The pipe pile body has at least one high-pressure water or cement grout channel along its axial direction, and the pile head has a material water hole connected to the high-pressure water or cement grout channel.

[0013] As a further embodiment of the present invention, the pipe section includes a reinforced concrete pipe body and pipe rings integrally connected to the upper and lower ends of the reinforced concrete pipe body, respectively. A reinforcing cage is provided inside the reinforced concrete pipe body, and the reinforcing cage is fixedly connected to the pipe rings. The high-pressure water or cement slurry channel includes a first channel arranged along the axial direction of the pipe section. The upper and lower adjacent reinforced concrete pipe bodies, the lower end of the pipe section and the pile head, and the upper end of the pipe section and the pile cap are all connected by pins.

[0014] As a further embodiment of the present invention, a sealing gasket is provided on the outside of the pin tube.

[0015] As a further embodiment of the present invention, the pipe ring is provided with a first pin hole that is in clearance fit with the pin tube, the pile head is provided with a second pin hole that is in clearance fit with the pin tube, the pile cap is provided with a third pin hole that is in clearance fit with the pin tube, and the pile cap is also provided with a high-pressure pipe joint that communicates with the third pin hole.

[0016] As a further embodiment of the present invention, the pipe ring is provided with a first washer hole that is in clearance fit with the sealing washer, and the pile cap is provided with a second washer hole that is in clearance fit with the sealing washer.

[0017] As a further embodiment of the present invention, the pile cap is externally fixedly equipped with multiple handles.

[0018] As a further embodiment of the present invention, the pile cap is also provided with a positioning hole that matches the pin tube.

[0019] As a further embodiment of the present invention, the upper end of the pile head is provided with a boss that is adapted to the inner ring of the pipe ring.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] During construction, even when encountering special geological formations (such as medium-coarse sand, sandy interlayers, riverbed gravel, or backfill soil containing large boulders), this invention uses high-pressure water jets (with air) to impact hard strata, combined with static pressure or hammering, effectively acting as a mechanical borehole guide and solving the problem of difficult downward movement of existing pipe piles. During construction, it prevents pile breakage and bending deformation. Upon reaching the design elevation, grout is sprayed through high-pressure water or cement slurry channels within the pipe pile, forming a spherical enlarged head (large-head concrete block) at the bottom of the pile.

[0022] Enlarged heads increase the friction within the original soil, thereby improving the bearing capacity of a single pile and limiting pile settlement. Especially in group pile construction at fixed sites, they eliminate local pile displacement, providing anti-buoyancy and significantly mitigating the soil squeezing effect caused by pipe pile construction. They also effectively prevent ground elevation and uplift within the pile area. Furthermore, enlarged heads in the pipe pile can block the transfer of pollutants to groundwater in local strata. Attached Figure Description

[0023] Figure 1 A schematic diagram of the grouting enlargement head for prestressed concrete water jet pipe piles;

[0024] Figure 2 This is a schematic diagram of a pipe section;

[0025] Figure 3 This is a schematic diagram of the internal structure of the pipe section;

[0026] Figure 4 This is a schematic diagram of the pile head;

[0027] Figure 5 This is a schematic diagram of a pile cap. Detailed Implementation

[0028] The present invention will be described in detail below with reference to specific embodiments. These embodiments are merely some, not all, implementations of the present invention. All other implementations obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0029] Example 1

[0030] like Figures 1-5As shown, the prestressed concrete water jet special pipe pile grouting enlarged head pile forming pipe material includes a pipe pile body and an irregularly shaped large-head concrete block 40 integrally connected to the lower end of the pipe pile body. The pipe pile body includes, from top to bottom, a pile cap 20, multiple pipe sections 10, and an inverted conical pile head 30. The pile head 30 is located inside the large-head concrete block 40. The pipe pile body is provided with at least one high-pressure water or cement slurry channel along its axial direction, and the pile head 30 is provided with a material water hole 33 connected to the high-pressure water or cement slurry channel.

[0031] The pipe section 10 includes a reinforced concrete pipe body 11 and pipe rings 15 integrally connected to the upper and lower ends of the reinforced concrete pipe body 11. A steel cage 13 is provided inside the reinforced concrete pipe body 11, and the steel cage 13 is fixedly connected to the pipe ring 15. The high-pressure water or cement slurry channel includes a first channel 12 arranged along the axial direction of the pipe section 10. The upper and lower adjacent reinforced concrete pipe bodies 11, the lower end of the pipe section 10 and the pile head 30, and the upper end of the pipe section 10 and the pile cap 20 are all connected by a pin pipe 51.

[0032] In this embodiment, a high-pressure water or cement slurry channel is provided, with an inner diameter greater than φ10mm.

[0033] During the construction of the pipe pile, when the pressure applied to the pipe section 10 reaches a certain preset value, the high-pressure water or cement slurry channel is connected to the high-pressure water. The high-pressure water is finally sprayed out from the material water hole 33, impacting the hard layer. The water and steam will wash away some of the soil and rock, making it easier for the pipe pile to reach the required construction depth. Among them, the inverted cone-shaped pile head 30 can effectively reduce the descent resistance.

[0034] After the pipe pile reaches the required construction depth, cement grout can be injected into the ground through high-pressure water or cement grout channels, depending on the construction requirements. The cement grout mixes with the existing soil and rock-mixed profiles, forming irregularly shaped, near-spherical large-headed concrete blocks 40 (φ600mm~φ1500mm). This improves the bearing capacity and buoyancy resistance of the pipe pile. Extensive testing has shown that while the large-headed concrete blocks 40 maintain a near-spherical shape, the more irregular their surface, the better their buoyancy resistance.

[0035] When prestressed concrete pipe piles are being constructed, they encounter special geological formations (such as medium-coarse sand formations, sandy interlayers, riverbed pebble formations, or backfill soil layers containing large boulders), making it difficult for the pipe pile to descend. If static pressure or hammering is forcibly applied, it can easily cause the pile to fracture or flexurally deform. In such cases, high-pressure water jets (with air) sprayed through high-pressure water or cement grout channels impact the hard strata and, in conjunction with static pressure or hammering, act as a guide for drilling, similar to other mechanical methods. Simultaneously, when the design elevation is reached, the steam valve is closed and the grouting valve is opened. Grouting is then carried out through the high-pressure water or cement grout channels within the pipe pile, with the grouting volume reaching twice the outer diameter of the pipe pile (or larger, depending on geological conditions). This forms a spherical enlarged head (i.e., a large-head concrete block 40) at the bottom of the pipe pile.

[0036] Enlarging the pile head increases the friction within the original soil, thereby improving the bearing capacity of a single pile and limiting pile settlement. Especially in group pile construction at fixed sites, it eliminates local pile displacement, acts as an anti-buoyancy agent, and significantly mitigates the soil squeezing effect caused by pipe pile construction. It also prevents ground elevation and bulging within the pile area.

[0037] The enlarged head formed by the pile can block and prevent pollutants from transferring to groundwater in local strata.

[0038] Example 2

[0039] The grouting and enlarged head construction process for prestressed concrete waterjet-delivered pipe piles includes the following steps:

[0040] Step 1: Construction Preparation

[0041] Leveling the site, laying out construction lines, and debugging equipment;

[0042] Step 2: Install the pipe pile body

[0043] First, install the pile head and the first pipe section, and then use a vibratory hammer to apply impact force to the pipe section to drive the pile.

[0044] Step 3, Piling

[0045] After each pipe section has sunk a certain distance, the next pipe section is installed until all pipe sections are installed. Then the pile cap is installed, and all pipe sections, pile heads and pile caps form the pipe pile body.

[0046] Step 4: Pour the large-head concrete block

[0047] The pipe pile body is provided with a high-pressure water or cement slurry channel for high-pressure water or concrete to pass through, and the pile head is provided with a material water hole connected to the high-pressure water or cement slurry channel.

[0048] Concrete is poured through high-pressure water or cement slurry channels and material water holes, eventually forming irregularly shaped large concrete blocks near the pile head.

[0049] In step 3, during the sinking process of each pipe section, when the impact force applied to the pipe section by the vibratory hammer reaches the preset value, the high-pressure water or cement slurry channel is connected to the high-pressure water. The high-pressure water impacts the hard layer and soil, assisting the pipe section to sink.

[0050] In this embodiment, high-pressure water typically refers to water flow with a pressure greater than 20 MPa.

[0051] Example 3

[0052] To ensure sealing, a sealing gasket 52 is fitted around the outside of the pin tube 51.

[0053] For ease of installation, the pipe ring 15 is provided with a first pin hole 151 that is in clearance fit with the pin pipe 51, the pile head 30 is provided with a second pin hole 32 that is in clearance fit with the pin pipe 51, the pile cap 20 is provided with a third pin hole that is in clearance fit with the pin pipe 51, and the pile cap 20 is also provided with a high-pressure pipe joint 21 that communicates with the third pin hole.

[0054] The pipe ring 15 is provided with a first washer hole 152 that is in clearance fit with the sealing washer 52, and the pile cap 20 is provided with a second washer hole that is in clearance fit with the sealing washer 52.

[0055] High-pressure pipe connector 21 can be used to connect to external high-pressure water.

[0056] Example 4

[0057] To facilitate hoisting and installation, the pile cap 20 is externally fixed with multiple handles 22.

[0058] Example 5

[0059] To ensure accurate installation and connection: the pile cap 20 is also provided with positioning holes 23 that match the pin tube 51.

[0060] Example 6

[0061] To ensure the installation effect, the upper end of the pile head 30 is provided with a boss 31 that matches the inner ring of the pipe ring 15.

[0062] Example 7

[0063] When cement grout is injected into the ground using a grouting pump through a high-pressure water or cement grout channel, the output grouting pressure of the pump changes in a pulsed manner, with the pulse waveform exhibiting a bell-shaped wave structure. According to experiments, the pulse waveforms include rectangular pulses, square pulses, trapezoidal wave structures, and triangular wave structures, resulting in a relatively regular uneven surface on the final large-head concrete block. Sharp pulses and sawtooth wave structures are not significantly different from rectangular pulses, exhibiting a relatively regular uneven structure. If it is a stepped wave, it will form several protrusions on the surface of the large-head concrete block, resembling a meteor hammer. Only the pulse waveform exhibiting a bell-shaped wave structure forms a relatively irregular, near-spherical shape with strong randomness, resulting in significant differences in shape between adjacent large-head concrete blocks, making it very suitable for construction in complex terrain.

[0064] Furthermore, it should be understood that those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A prestressed concrete water-jet special pipe pile grouting enlarged head pile forming pipe material, characterized in that: The pipe pile body, the irregularly shaped big head concrete block (40) integrally connected with the lower end of the pipe pile body, the pile cap (20), the multi-section pipe section (10), the pile head (30) in the form of inverted cone, the pile head (30) is located inside the big head concrete block (40); the pipe pile body is provided with at least one high-pressure water or cement slurry passage along its axial direction, and the pile head (30) is provided with a material water hole (33) communicated with the high-pressure water or cement slurry passage.

2. The prestressed concrete water-jet special pipe pile grouting enlarged head pile forming pipe material according to claim 1, characterized in that: The pipe section (10) comprises a reinforced concrete pipe body (11), pipe rings (15) integrally connected with the upper and lower ends of the reinforced concrete pipe body (11) respectively, a steel cage (13) arranged inside the reinforced concrete pipe body (11), and the steel cage (13) is fixedly connected with the pipe rings (15); the high-pressure water or cement slurry passage comprises a first passage (12) arranged along the axial direction of the pipe section (10), a pin tube (51) arranged between the upper and lower adjacent reinforced concrete pipe bodies (11), the lower end of the pipe section (10) and the pile head (30), and the upper end of the pipe section (10) and the pile cap (20).

3. The prestressed concrete water-jet special pipe pile grouting enlarged head pile pipe material according to claim 2, characterized in that: The pin tube (51) is externally sleeved with a sealing gasket (52).

4. The prestressed concrete water-jet special pipe pile grouting enlarged head pile pipe material according to claim 3, characterized in that: The pipe ring (15) is provided with a first pin hole (151) in gap fit with the pin tube (51), the pile head (30) is provided with a second pin hole (32) in gap fit with the pin tube (51), the pile cap (20) is provided with a third pin hole in gap fit with the pin tube (51), and the pile cap (20) is further provided with a high-pressure pipe joint (21) communicated with the third pin hole.

5. The prestressed concrete water-jet special pipe pile grouting enlarged head pile pipe material according to claim 3, characterized in that: The pipe ring (15) is provided with a first gasket hole (152) in gap fit with the sealing gasket (52), and the pile cap (20) is provided with a second gasket hole in gap fit with the sealing gasket (52).

6. The prestressed concrete water-jet specific pipe pile grouting enlarged head pile pipe material according to claim 1, characterized in that: A plurality of handles (22) are fixedly installed outside the pile cap (20).

7. The prestressed concrete water-jet specific pipe pile grouting enlarged head pile pipe material according to claim 2, characterized in that: The pile cap (20) is further provided with a positioning hole (23) matched with the pin tube (51).

8. The prestressed concrete water-jet specific pipe pile grouting enlarged head pile pipe material according to claim 2, characterized in that: The upper end of the pile head (30) is provided with a boss (31) matched with the inner ring of the pipe ring (15).

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