CN111794231A - Device and method for breaking foundation pile head - Google Patents
Device and method for breaking foundation pile head Download PDFInfo
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- CN111794231A CN111794231A CN202010687940.8A CN202010687940A CN111794231A CN 111794231 A CN111794231 A CN 111794231A CN 202010687940 A CN202010687940 A CN 202010687940A CN 111794231 A CN111794231 A CN 111794231A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D9/00—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof
- E02D9/005—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof removing the top of placed piles of sheet piles
Abstract
The invention relates to a device and a method for breaking a pile head of a foundation pile, and belongs to the technical field of cast-in-place concrete piles. The method for breaking the pile head of the foundation pile comprises the following steps: the method comprises the following steps: erecting a breaking device, and arranging the breaking device on the over-grouting part of the cast-in-place pile before initial setting of concrete; step two: cutting the pile head of the cast-in-place pile, forming high-speed water flow in the breaking device by using a high-pressure device, and cutting the pile head of the cast-in-place pile; step three: and cleaning the pile head, withdrawing the breaking device and discharging waste liquid in the template after the breaking device finishes cutting, removing the template after the concrete is initially set, and washing exposed reinforcing steel bars. The method can effectively break the pile head of the foundation pile and reduce the damage to the main reinforcement in the breaking process.
Description
Technical Field
The invention relates to a device and a method for breaking a pile head of a foundation pile, and belongs to the technical field of cast-in-place concrete piles.
Background
The pile head breaking is the last key process of the cast-in-situ bored pile construction and is also an indispensable component of the cast-in-situ bored pile construction. At present, the pile head breaking method mainly comprises a manual pile breaking method, a mechanical pile breaking method and a rapid and nondestructive honeycomb pile breaking method. In the manual pile breaking method and the mechanical pile breaking method, the construction mode is simple, the operation is convenient, and the requirement on personnel is not high; however, the manual pile breaking method and the mechanical pile breaking method have low construction efficiency and high labor cost, and after the pile head is broken, the large concrete is difficult to transport out of the foundation pit, and the main reinforcement is easy to bend and deform in the breaking process. The quick and nondestructive honeycomb type pile head breaking method is high in construction efficiency, and can effectively improve the construction environment; however, the quick and nondestructive honeycomb type pile head breaking method has high requirements on constructors, and usually needs a crane and other large-scale machines to cooperate, so that the cost required to be input for construction is high, the whole construction mode is complex, and the operation is inconvenient.
Disclosure of Invention
Aiming at the problems that the pile head of the cast-in-place pile in the prior art is low in breaking efficiency and large concrete is difficult to transport out of a foundation pit after the pile head is broken, the invention provides the device for breaking the pile head of the foundation pile, which can simultaneously break the pile head of the cast-in-place pile in multiple directions before the initial setting of the concrete and is beneficial to discharging the broken concrete out of a template.
In order to achieve the purpose, the invention adopts the technical scheme that: the device for breaking the pile head of the foundation pile comprises a spraying pipe, wherein the top of the spraying pipe is connected with a feeding pipe, the upper end of the spraying pipe is provided with a handle, the bottom of the spraying pipe is fixedly provided with at least 2 auxiliary spraying pipes, and all the auxiliary spraying pipes are arranged at intervals in the circumferential direction of the spraying pipe; a stirring device is fixedly arranged below the material spraying pipe, and a stirring sheet is fixedly arranged on the lower bottom surface of the stirring device.
The upper end of the spraying pipe is provided with the handle, and the auxiliary spraying pipes are arranged at intervals in the circumferential direction of the spraying pipe, so that when the pile head of the cast-in-place pile is broken, the breaking device can simultaneously break the pile head of the cast-in-place pile in multiple directions by rotating the handle, and the breaking efficiency of the pile head of the cast-in-place pile can be improved; the breaking device is characterized in that a stirring device is fixedly arranged below the material spraying pipe, and a stirring sheet is fixedly arranged on the lower bottom surface of the stirring device, so that when the breaking device is used for breaking the pile head of the cast-in-place pile, concrete in the template can be further diluted into a fluid state in a handle rotating mode, and the broken concrete can be discharged out of the template.
Further, the method comprises the following steps: the handle is of an annular structure and is coaxially arranged with the material spraying pipe, and the handle is fixedly connected with the material spraying pipe through a fixing rod; the handles are at least 2 groups and are arranged at intervals in the axial direction of the material spraying pipe. Arrange the handle interval on the axis direction of spouting the material pipe to when breaking device down stretches into in the concrete, can carry out better the accuse to breaking device.
Further, the method comprises the following steps: the bottom of the material spraying pipe is fixedly provided with a main spray pipe, the main spray pipe and the material spraying pipe are coaxially arranged, and a spray nozzle is arranged at the spray opening of the main spray pipe; a protective baffle is arranged below the nozzle, is disc-shaped and is arranged coaxially with the main nozzle; the protective baffle is fixed on the material spraying pipe through a connecting rod, or the protective baffle is fixed on the auxiliary spraying pipe through a connecting rod. Therefore, water or slurry and the like can be sprayed from the main spray pipe, and a round water jet with larger force is formed through the protective baffle, so that the pile head of the cast-in-place pile is cut; meanwhile, the protection baffle can also prevent water or slurry sprayed from the main nozzle from directly impacting the cast-in-place pile, so that the depression formed in the middle of the cast-in-place pile can be avoided.
Further, the method comprises the following steps: a spray pipe protecting piece is fixedly arranged on the auxiliary spray pipe, is of an annular structure and is coaxially arranged with the spray pipe; at least one fixing ring is arranged above the spray pipe protecting piece, and the fixing ring is fixedly connected with the spray pipe protecting piece through a supporting frame; the axis of support frame and the axis parallel arrangement who spouts the material pipe to the bottom of support frame sets firmly in the junction of vice spray tube and spray tube protection piece, and the fixed ring is arranged with spouting the coaxial line between the material pipe, and fixed ring passes through the link and spouts fixed connection between the material pipe. In the construction process, the damage of concrete to the auxiliary spray pipe can be reduced through the spray pipe protecting piece; set up solid fixed ring in the top of spray tube protection piece, gu be connected through the support frame between fixed ring and the spray tube protection piece to can make operating personnel in operating handle, can also step on solid fixed ring's mode with the foot, stretch into the inside of bored concrete pile with this device.
Further, the method comprises the following steps: the stirring device comprises a stirring piece, the stirring piece is of a circular ring structure, and the stirring piece is fixedly connected with the auxiliary spray pipe through a support rod; the stirring pieces are fixedly arranged on the lower bottom surface of the stirring piece and are arranged at intervals in the circumferential direction of the stirring piece, and the distribution direction of each stirring piece is the radial direction of the stirring piece, so that the concrete is stirred better, the concrete is diluted into a fluid state, and the concrete is discharged out of the formwork.
Aiming at the problems that the pile head of the cast-in-place pile in the prior art is low in breaking efficiency and can affect main ribs in the process of breaking the pile head, the invention provides the method for breaking the pile head of the foundation pile, which is simple in construction mode and convenient to operate, and can effectively break the pile head of the foundation pile and reduce the damage to the main ribs in the breaking process.
In order to achieve the purpose, the invention adopts the technical scheme that: the method for breaking the pile head of the foundation pile is combined with the device for breaking the pile head of the foundation pile, and comprises the following steps:
the method comprises the following steps: erecting a breaking device, and arranging the breaking device on the over-grouting part of the cast-in-place pile before initial setting of concrete;
step two: cutting the pile head of the cast-in-place pile, forming high-speed water flow in the breaking device by using a high-pressure device, and cutting the pile head of the cast-in-place pile;
step three: and cleaning the pile head, withdrawing the breaking device and discharging waste liquid in the template after the breaking device finishes cutting, removing the template after the concrete is initially set, and washing exposed reinforcing steel bars.
Before the concrete is initially set, the cutting material is formed into high-speed water flow in the breaking device through the high-pressure device, so that the concrete is diluted and cut, the pile head of the cast-in-place pile is broken, and the breaking is not required to be carried out after the concrete is solidified, so that the construction period can be shortened, and the construction cost is reduced; and before the concrete is initially set, the concrete is diluted and cut, so that a reinforcing mesh in the cast-in-place pile can be well protected, the damage to the reinforcing steel bar is reduced, and a large concrete block cannot be formed after the pile head is broken.
Further, the method comprises the following steps: in the step of erecting the breaking device, the breaking device is arranged at the top of the over-irrigation part of the cast-in-place pile; in the step of cutting the pile head of the cast-in-place pile, when the concrete is cut, the breaking device extends downwards from the top of the over-cast part of the cast-in-place pile and simultaneously stirs the slurry. In the breaking process, the breaking device is stretched into from top to bottom, and the slurry is stirred to be more favorable for peeling of concrete, so that the construction efficiency can be improved.
Further, the method comprises the following steps: the cutting material is slurry and the high pressure device is a slurry pump and a high pressure pipe, so that the concrete can be better diluted and cut, which is a preferred embodiment.
Further, the method comprises the following steps: before the step of erecting the breaking device, the step of presetting the cutting depth is also included; in the step of cleaning the pile head of the cast-in-place pile, the breaking device is made to reach the preset cutting depth and then the concrete is cut; after the step of cleaning the pile head of the cast-in-place pile, a step of breaking the concrete of the protective layer and a step of repairing the pile head are also arranged; the step of predetermining the ablation depth is: according to the height of the over-poured part of the cast-in-place pile and the reserved safe thickness of the pile body of the foundation pile, the cutting depth of the concrete is preset; the step of breaking the protective layer concrete is as follows: breaking the reserved safe thickness of the pile body of the foundation pile; the pile head repairing method comprises the following steps: completely breaking the concrete with poor pile head quality, and cleaning concrete blocks; the step of pile head repair follows the step of breaking the protective layer concrete. The cutting depth is predetermined before the step of erecting the breaking device, so that the damage to the foundation pile below the cast-in-place pile in the process of breaking the pile head of the cast-in-place pile can be avoided.
The invention has the beneficial effects that:
1. the construction period can be shortened, and the construction cost is reduced.
2. The pile head of the foundation pile can be effectively broken, and the damage to the main reinforcement can be reduced in the breaking process.
3. Can carry out the abolishment of a plurality of directions to the bored concrete pile head to can do benefit to the concrete discharge template that will abolish.
Drawings
FIG. 1 is a schematic three-dimensional structure of the breaking device of the present invention.
Fig. 2 is an enlarged schematic view of a point a in fig. 1.
Fig. 3 is a schematic view of a connection structure of the protective baffle and the high-speed nozzle.
The labels in the figure are: 1-a spray pipe, 2-a feed pipe, 3-a handle, 31-a fixed rod, 4-a main spray pipe, 41-a high-speed nozzle, 42-a protective baffle, 43-a connecting rod, 5-an auxiliary spray pipe, 6-a stirring device, 61-a stirring sheet, 62-a stirring piece, 63-a supporting rod, 7-a spray pipe protecting piece, 8-a fixed ring, 81-a connecting frame and 9-a supporting frame.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
In order to simultaneously break the pile head of the cast-in-place pile in multiple directions before the initial setting of the concrete and facilitate the removal of the broken concrete out of the template, as shown in fig. 1 to 3, the invention provides a device for breaking the pile head of the foundation pile, which comprises a spraying pipe 1, wherein the top of the spraying pipe 1 is connected with a feeding pipe 2, the upper end of the spraying pipe 1 is provided with a handle 3, the bottom of the spraying pipe 1 is fixedly provided with at least 2 auxiliary spraying pipes 5, and all the auxiliary spraying pipes 5 are arranged at intervals in the circumferential direction of the spraying pipe 1; a stirring device 6 is fixedly arranged below the material spraying pipe 1, and a stirring sheet 61 is fixedly arranged on the lower bottom surface of the stirring device 6.
The working process of the breaking device provided by the invention is as follows: before the initial setting of the concrete, the breaking device is arranged inside the super-filling part of the cast-in-place pile, the cutting material enters the spraying pipe 1 from the feeding pipe 2 and is sprayed out through the auxiliary spraying pipe 5 at the bottom of the spraying pipe 1, and then the concrete around the breaking device is diluted and cut. The upper end of the spraying pipe 1 is provided with the handle 3, and the auxiliary spraying pipes 5 are arranged at intervals in the circumferential direction of the spraying pipe 1, so that when the pile head of the cast-in-place pile is broken, the pile head can be broken in multiple directions by the breaking device in the invention in a mode of rotating the handle 3; the breaking device is characterized in that a stirring device 6 is fixedly arranged below the material spraying pipe 1, and a stirring sheet 61 is fixedly arranged on the lower bottom surface of the stirring device 6, so that when the breaking device provided by the invention is used for breaking the pile head of the cast-in-place pile, concrete in the template can be further diluted into a fluid state in a mode of rotating the handle 3, and the broken concrete can be discharged out of the template. In the present invention, the cutting material may be water or slurry, etc.
In the breaking device provided by the present invention, the specific shape of the handle 3 is not limited, as shown in fig. 1, for the convenience of implementation and the convenience of rotation of the breaking device in the present invention, the handle 3 may be configured as a ring structure, and the handle 3 and the spraying tube 1 are coaxially arranged, and the handle 3 is fixedly connected with the spraying tube 1 through the fixing rod 31. In this embodiment, the specific number of the fixing rods 31 is not limited as long as the stable connection between the handle 3 and the material spraying tube 1 can be ensured. The specific structure of the fixing rod 31 is not limited, and for convenience of implementation, the fixing rod 31 may be made of a common steel pipe or a steel bar. The arrangement mode of the fixing rod 31 is not limited, the fixing rod 31 can be arranged along the radial direction of the spraying pipe 1, and the handle 3 is further connected with the spraying pipe 1; the fixing rod 31 can also be obliquely arranged, so that one end of the fixing rod 31 is fixedly connected with the handle 3, and the other end of the fixing rod 31 is fixedly connected with the material spraying pipe 1; alternatively, as shown in fig. 1, the fixing rod 31 may be arranged along the radial direction of the spray tube 1, and the fixing rod 31 may be obliquely disposed below the handle 3, thereby connecting the handle 3 and the spray tube 1. The specific number of the handles 3 is not limited, and in order to enable the breaking device to be better controlled when the breaking device extends downwards in the concrete, the handles 3 of the breaking device are at least 2 groups and are arranged at intervals in the axial direction of the material spraying pipe 1. In fig. 1, the number of the handles 3 is 2 for the sake of simplification of the structure. Simultaneously, can also be provided with the slipmat on handle 3, can help the better device is abolished in the accuse of operator through the slipmat, the concrete structure of slipmat is not limited, as long as can be convenient for the operator grip, can not produce skid can, for implementing, can select ordinary flexible glue pad to the winding is on handle 3.
As shown in fig. 2 and fig. 3, a main nozzle 4 is further fixedly arranged at the bottom of the spray pipe 1, the main nozzle 4 and the spray pipe 1 are coaxially arranged, and a nozzle 41 is arranged at the nozzle of the main nozzle 4; a protective baffle 42 is arranged below the nozzle 41, and the protective baffle 42 is disc-shaped and is arranged coaxially with the main nozzle 4; the protective screen 42 is fixed to the spray pipe 1 by means of a connecting rod 43, or the protective screen 42 is fixed to the secondary nozzle 5 by means of a connecting rod 43. In the breaking device of the invention, the pipe diameter of the auxiliary spray pipe 5 can be the same as or different from the pipe diameter of the main spray pipe 4, and for the convenience of implementation, the pipe diameter of the auxiliary spray pipe 5 can be the same as the pipe diameter of the main spray pipe 4. The specific arrangement position between the secondary nozzle 5 and the material spraying pipe 1 is not limited, and for implementation, the secondary nozzle 5 can be arranged perpendicular to the material spraying pipe 1. The specific number of the secondary nozzles 5 is not limited, and the secondary nozzles are generally manufactured according to actual requirements, so that the secondary nozzles 5 can be better controlled to perform dilution and cutting in the circumferential direction of the main nozzles 4 by rotating the handle 3, and the secondary nozzles 5 can be arranged at equal intervals in the circumferential direction of the material spraying pipe 1.
In the invention, after the cutting material is sprayed from the main nozzle 4, a round water jet with larger force is formed by the protective baffle 42, so that the pile head of the cast-in-place pile is cut, and the breaking efficiency of the pile head of the cast-in-place pile can be improved; meanwhile, the protection shield 42 prevents water or slurry, etc. injected from the main nozzles 4 from directly impacting the cast-in-place pile, so that a depression can be prevented from being formed in the middle of the cast-in-place pile. In the present invention, the pipe diameter of the main nozzle 4 may be the same as or different from that of the spray pipe 1, and for implementation convenience, as shown in fig. 3, the pipe diameter of the main nozzle 4 may be set smaller than that of the spray pipe 1, and the connecting rod 43 may be fixed on the lower bottom surface of the spray pipe 1. In the present invention, the connecting rod 43 may be made of a common steel member, such as a steel bar. The main nozzles 4 are provided with nozzles 41 so as to supply high-speed water flows to the main nozzles 4; of course, the nozzles 41 can also be provided on the secondary nozzle 5 in order to provide a high-speed water flow to the secondary nozzle 5.
In the construction process, in order to reduce the damage of concrete to the auxiliary spray pipe 5, the breaking device is characterized in that a spray pipe protecting piece 7 is fixedly arranged on the auxiliary spray pipe 5, and the spray pipe protecting piece 7 is in an annular structure and is coaxially arranged with the spray pipe 1; the nozzle protector 7 may be fixed above the secondary nozzle 5 or below the secondary nozzle 5, and for convenience of implementation, the nozzle protector 7 may be fixed below the secondary nozzle 5 as shown in fig. 2. In order to enable an operator to operate the handle 3 and simultaneously extend the device into the cast-in-place pile in a foot stepping mode, the breaking device is provided with at least one fixing ring 8 above the spray pipe protecting piece 7, and the fixing ring 8 is fixedly connected with the spray pipe protecting piece 7 through a support frame 9; the structure of the supporting frame 9 is not limited, and for the convenience of manufacturing, the supporting frame 9 can be selected from common steel members, such as steel pipes or steel bars. In order to ensure the connection strength among the fixed ring 8, the secondary nozzle 5 and the nozzle protection member 7, the axis of the supporting frame 9 and the axis of the spraying pipe 1 can be arranged in parallel, the bottom end of the supporting frame 9 is fixedly arranged at the connection position of the secondary nozzle 5 and the nozzle protection member 7, the fixed ring 8 and the spraying pipe 1 are arranged coaxially, the fixed ring 8 is fixedly connected with the spraying pipe 1 through the connecting frame 81, and the connecting frame 81 can be selected as a steel bar for facilitating the manufacturing.
In order to better stir the concrete and dilute the concrete into fluid, so as to discharge the concrete out of the formwork, as shown in fig. 2, the stirring device 6 in the breaking device of the present invention includes a stirring member 62, the stirring member 62 has a circular structure, and the stirring member 62 is fixedly connected with the auxiliary spray pipe 5 through a support rod 63. The selection manner of the support bar 63 is not limited, and for convenience of implementation, the support bar 63 may be a steel bar or a steel pipe. The stirring blades 61 are fixedly arranged on the lower bottom surface of the stirring piece 62, the specific number of the stirring blades 61 is not limited, and the specific arrangement mode on the stirring piece 62 is not limited, so that the stirring blades 61 can be arranged at intervals in the circumferential direction of the stirring piece 62 for implementation; in order that the stirring effect may be further improved, the distribution direction of each stirring blade 61 may be made the radial direction of the stirring members 62. The specific structure of the stirring blade 61 is not limited, and for implementation convenience, the stirring blade 61 may be configured as a rectangular structure; of course, the stirring blade 61 may have other shapes, such as a triangle shape. Stirring piece 61 can with stir and arrange perpendicularly between 62, also can with stir and arrange aslope between 62, as long as can be through stirring piece 61, be convenient for stir the concrete can.
Example 2
In order to effectively break the pile head of the foundation pile and reduce the damage to the main reinforcement in the breaking process, the invention provides a method for breaking the pile head of the foundation pile, which is combined with the device for breaking the pile head of the foundation pile, and comprises the following steps:
erecting a breaking device, and arranging the breaking device on the over-grouting part of the cast-in-place pile before initial setting of concrete;
secondly, cutting the pile head of the cast-in-place pile, wherein the cutting material is formed into high-speed water flow in a breaking device through a high-pressure device so as to cut the pile head of the cast-in-place pile;
thirdly, cleaning the pile head, withdrawing the breaking device and discharging waste liquid in the template after the breaking device finishes cutting, dismantling the template after the concrete is initially set and washing exposed reinforcing steel bars;
in the method provided by the invention, before the initial setting of the concrete, the cutting material is formed into high-speed water flow in the breaking device through the high-pressure device, the concrete in the pile head of the cast-in-place pile is diluted to a certain extent, and the pile head of the cast-in-place pile is cut at the same time without breaking the concrete after the concrete is solidified, so that the construction period can be shortened and the construction cost can be reduced through the method provided by the invention; and before the concrete is initially set, the concrete is diluted and cut, so that a reinforcing mesh in the cast-in-place pile can be well protected, the damage to the reinforcing steel bar is reduced, and a large concrete block cannot be formed after the pile head is broken.
The method for breaking the pile head of the foundation pile provided by the invention is used for cutting and breaking the pile head of the cast-in-place pile based on the dilution principle before the initial setting of concrete, and has obvious advantages in economic benefit, environmental protection, safety and pile forming quality compared with the existing method for breaking the pile head of the cast-in-place pile.
From the economic benefit, the comparative analysis is carried out on the used equipment expense, the construction period and the labor cost, and the specific steps are as follows:
table 1 shows the comparative analysis table of the method, the traditional pile head breaking construction method and the rapid lossless honeycomb pile head breaking method in terms of the used equipment cost, construction period and labor cost
As can be seen from the table, the construction period can be reduced by adopting the method provided by the invention; the method provided by the invention is simple to operate, has low requirement on operators, and can reduce the labor cost; in addition, the method can use common equipment, and can greatly reduce the mechanical and material cost compared with large-scale mechanical equipment.
From the aspect of environmental protection and safety, the method provided by the invention is simple in construction and convenient to operate, and the operation space is positioned on the ground, so that the method is safer; meanwhile, the method provided by the invention does not use chemical agents in the process of removing the pile head of the cast-in-place pile, so that no waste is generated in the process of removing the pile head of the cast-in-place pile, and the method is more environment-friendly. The traditional construction method for breaking the pile head can generate a large amount of dust in the construction process, so that the air quality of a construction area is influenced; in addition, a large amount of noise can be caused in the construction process, a large amount of concrete fragments can be generated, and great potential safety hazards exist. The quick and nondestructive honeycomb type pile head breaking method needs to be matched with large-scale equipment for construction after foundation pit excavation, and certain potential safety hazards exist.
From the aspect of pile forming quality, the method provided by the invention can reduce the influence on the reinforcing steel bars, thereby improving the pile forming quality. The traditional construction method for breaking the pile head cannot avoid bending deformation of longitudinal steel bars, and meanwhile, when the concrete pile head is cut, the steel bars are easy to cut, so that the steel bars are damaged, and further the pile forming quality is influenced.
Therefore, the method provided by the invention has obvious advantages in economic benefit, environmental protection, safety and pile forming quality compared with the existing method for breaking the pile head of the cast-in-place pile.
In order to further improve the construction efficiency, in the step of erecting the breaking device, the breaking device is arranged at the top of the over-irrigation part of the cast-in-place pile; in the step of cutting the pile head of the cast-in-place pile, when the concrete is cut, the breaking device extends downwards from the top of the over-cast part of the cast-in-place pile and simultaneously stirs the slurry. In the process of breaking the pile head of the cast-in-place pile, the breaking device extends from top to bottom, and the slurry is stirred to be more favorable for peeling off the concrete, so that the construction efficiency can be improved.
In order to better dilute and cut the concrete, in the method provided by the invention, the cutting material can be selected as slurry, and the high-pressure device is selected as a slurry pump and a high-pressure pipe, so that the slurry pump conveys the slurry into the breaking device through the high-pressure pipe, and high-speed water flow can be formed in the breaking device, thereby facilitating the dilution and cutting of the concrete.
In order to reduce the damage to a foundation pile below a cast-in-place pile in the process of breaking the pile head of the cast-in-place pile, the method provided by the invention also comprises the step of presetting the cutting depth before the step of erecting the breaking device; in the step of cleaning the pile head of the cast-in-place pile, the breaking device is made to reach the preset cutting depth and then the concrete is cut; after the step of cleaning the pile head of the cast-in-place pile, a step of breaking the concrete of the protective layer and a step of repairing the pile head are also arranged; the step of predetermining the ablation depth is: according to the height of the over-poured part of the cast-in-place pile and the reserved safe thickness of the pile body of the foundation pile, the cutting depth of the concrete is preset; the step of breaking the protective layer concrete is as follows: breaking the reserved safe thickness of the pile body of the foundation pile; the pile head repairing method comprises the following steps: completely breaking the concrete with poor pile head quality, and cleaning concrete blocks; the step of pile head repair follows the step of breaking the protective layer concrete.
In the method provided by the invention, the preset concrete cutting depth is designed according to the height of the over-poured part of the cast-in-place pile and the reserved safe thickness of the pile body of the foundation pile, and experiments prove that the cutting depth value of the over-poured part of the cast-in-place pile is 55-65 cm when the height of the over-poured part of the cast-in-place pile is 100cm and the reserved safe thickness of the pile body of the foundation pile is 35cm, so that the better breaking effect is achieved.
The following table is a statistical table of the time length required for breaking different depths when the super-irrigation pile with the height of 100cm is broken:
table 2 is a statistical table of the time length required for breaking different depths when breaking a 100 cm-high super-irrigation pile
In order to reduce the damage to a foundation pile below a cast-in-place pile in the process of breaking the pile head of the cast-in-place pile, a safety thickness is required to be reserved for a pile body of the foundation pile, and the reserved safety thickness is generally selected according to actual conditions; if the reserved safe thickness is too low, the quality of the foundation pile can be influenced, and if the reserved safe thickness is too high, the difficulty of subsequently breaking the concrete protective layer can be increased. In the method provided by the invention, when the super-irrigation pile with the height of 100cm is broken, the safe thickness of 35cm can be reserved for the pile body of the foundation pile. Obviously, after the breaking device completes breaking, the closer the height of the residual pile head is to the reserved safety thickness of the foundation pile, the better the breaking effect on the pile head is. It can be seen from the table that when the cutting depth is 55cm and the cutting depth is 63cm, the required operation time is 20min, and the heights of the residual pile heads of the two are close to the reserved safe thickness. And when the cutting depth is less than 55cm, although the operation time is reduced, the difference between the height of the residual pile head and the reserved safe thickness of the pile body of the foundation pile is larger, so that the difficulty of subsequently breaking the concrete protective layer is increased. And when the cutting depth is more than 65cm, the height of the residual pile head is less than the reserved safe thickness of the pile body of the foundation pile, so that the selection is not suitable. Therefore, when the super-irrigation pile with the height of 100cm is broken and the reserved safe thickness of the pile body of the foundation pile is set to be 35cm, the cutting depth is 55 cm-65 cm, and the breaking effect is good.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. Break device of foundation pile head, its characterized in that: the spraying device comprises a spraying pipe (1), wherein the top of the spraying pipe (1) is connected with a feeding pipe (2), the upper end of the spraying pipe (1) is provided with a handle (3), the bottom of the spraying pipe (1) is fixedly provided with at least 2 auxiliary spraying pipes (5), and all the auxiliary spraying pipes (5) are arranged at intervals in the circumferential direction of the spraying pipe (1); a stirring device (6) is fixedly arranged below the material spraying pipe (1), and a stirring sheet (61) is fixedly arranged on the lower bottom surface of the stirring device (6).
2. An apparatus for demolishing a pile head of foundation pile according to claim 1, wherein: the handle (3) is of an annular structure and is coaxially arranged with the material spraying pipe (1), and the handle (3) is fixedly connected with the material spraying pipe (1) through a fixing rod (31); the handles (3) are at least 2 groups and are arranged at intervals in the axial direction of the material spraying pipe (1).
3. An apparatus for demolishing a pile head of foundation pile according to claim 1, wherein: a main spray pipe (4) is fixedly arranged at the bottom of the spray pipe (1), the main spray pipe (4) and the spray pipe (1) are coaxially arranged, and a spray nozzle (41) is arranged at a spray nozzle of the main spray pipe (4); a protective baffle (42) is arranged below the nozzle (41), and the protective baffle (42) is disc-shaped and is coaxially arranged with the main nozzle (4); the protective baffle (42) is fixed on the material spraying pipe (1) through a connecting rod (43), or the protective baffle (42) is fixed on the auxiliary spraying pipe (5) through the connecting rod (43).
4. A pile head breaking device according to any one of claims 1 to 3, wherein: a spray pipe protecting piece (7) is fixedly arranged on the auxiliary spray pipe (5), and the spray pipe protecting piece (7) is of an annular structure and is coaxially arranged with the spray pipe (1);
at least one fixing ring (8) is arranged above the spray pipe protecting piece (7), and the fixing ring (8) is fixedly connected with the spray pipe protecting piece (7) through a support frame (9);
the axis of support frame (9) and the axis parallel arrangement of spouting material pipe (1) to the bottom of support frame (9) sets firmly in the junction of vice spray tube (5) and spray tube protection piece (7), and fixed ring (8) and spout and arrange the coaxial line between material pipe (1), and fixed ring (8) through link (81) with spout fixed connection between material pipe (1).
5. An apparatus for demolishing a pile head of foundation pile according to claim 1, wherein: the stirring device (6) comprises a stirring piece (62), the stirring piece (62) is of a circular ring-shaped structure, and the stirring piece (62) is fixedly connected with the auxiliary spray pipe (5) through a support rod (63); the stirring blades (61) are fixedly arranged on the lower bottom surface of the stirring piece (62) and are arranged at intervals in the circumferential direction of the stirring piece (62), and the distribution direction of each stirring blade (61) is the radial direction of the stirring piece (62).
6. Method for breaking a foundation pile head, comprising a device for breaking a foundation pile head according to any one of claims 1 to 5, characterized in that it comprises the following steps:
the method comprises the following steps: erecting a breaking device, and arranging the breaking device on the over-grouting part of the cast-in-place pile before initial setting of concrete;
step two: cutting the pile head of the cast-in-place pile, forming high-speed water flow in the breaking device by using a high-pressure device, and cutting the pile head of the cast-in-place pile;
step three: and cleaning the pile head, withdrawing the breaking device and discharging waste liquid in the template after the breaking device finishes cutting, removing the template after the concrete is initially set, and washing exposed reinforcing steel bars.
7. The method of demolishing a pile head of a foundation pile as claimed in claim 6, wherein: in the step of erecting the breaking device, the breaking device is arranged at the top of the over-irrigation part of the cast-in-place pile;
in the step of cutting the pile head of the cast-in-place pile, when the concrete is cut, the breaking device extends downwards from the top of the over-cast part of the cast-in-place pile and simultaneously stirs the slurry.
8. The method of demolishing a pile head of a foundation pile as claimed in claim 6, wherein: the cutting material is slurry, and the high-pressure device is a slurry pump and a high-pressure pipe.
9. A method of demolishing a pile head according to any one of claims 6 to 8, wherein: before the step of erecting the breaking device, the step of presetting the cutting depth is also included;
in the step of cleaning the pile head of the cast-in-place pile, the breaking device is made to reach the preset cutting depth and then the concrete is cut;
after the step of cleaning the pile head of the cast-in-place pile, a step of breaking the concrete of the protective layer and a step of repairing the pile head are also arranged;
the step of predetermining the ablation depth is: according to the height of the over-poured part of the cast-in-place pile and the reserved safe thickness of the pile body of the foundation pile, the cutting depth of the concrete is preset;
the step of breaking the protective layer concrete is as follows: breaking the reserved safe thickness of the pile body of the foundation pile;
the pile head repairing method comprises the following steps: completely breaking the concrete with poor pile head quality, and cleaning concrete blocks;
the step of pile head repair follows the step of breaking the protective layer concrete.
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| CN202010687940.8A CN111794231B (en) | 2020-07-16 | 2020-07-16 | Device and method for breaking foundation pile head |
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| CN112942315A (en) * | 2021-04-13 | 2021-06-11 | 中冶京诚工程技术有限公司 | Cast-in-place concrete pile head separating device |
| WO2023024590A1 (en) * | 2021-08-24 | 2023-03-02 | 南京工业大学 | High-pressure water jet assisted pile pulling device and construction method |
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|---|---|
| CN111794231B (en) | 2021-08-03 |
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