CN218911391U - Combined stiffening steel pile casing for bored pile construction - Google Patents
Combined stiffening steel pile casing for bored pile construction Download PDFInfo
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- CN218911391U CN218911391U CN202223206693.9U CN202223206693U CN218911391U CN 218911391 U CN218911391 U CN 218911391U CN 202223206693 U CN202223206693 U CN 202223206693U CN 218911391 U CN218911391 U CN 218911391U
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Abstract
The utility model relates to the technical field of steel pile casings, and discloses a combined stiffening steel pile casing for bored pile construction, which comprises an inner pile casing, wherein an outer pile casing is sleeved on the surface of the inner pile casing; according to the utility model, through the design of dividing the steel casing into the inner casing and the outer casing, the inner casing is used as a construction process tool, vertical rigidity in the first stage is mainly provided, downward traction force is provided for the outer casing under the action of the upper stiffening steel plate and the lower stiffening steel plate on the edge angle reinforcing steel ring of the outer casing, so that the outer casing steel plate is vertically subjected to tension rather than pressure in the pore forming process, the instability phenomenon is avoided, the inner casing is pulled out and only the outer casing is left to serve as a casing wall for use when the stress enters the second stage after the pore forming is finished, and the outer casing only needs to provide annular rigidity, so that the annular rigidity can be realized by using a lower cost structure, the inner casing is high in rigidity and high in cost, but can be repeatedly used, and the aims of reliable technology and low cost can be realized by the device.
Description
Technical Field
The utility model relates to the technical field of building construction, in particular to a combined stiffening steel pile casing for bored pile construction.
Background
Along with the rapid development of national economy, a large number of building projects such as house construction, municipal administration, subways and the like are emerging, and the bored pile is used as one of the most basic foundation structure types of the building projects, has the characteristics of high bearing capacity, strong adaptability, moderate cost and the like, and is widely applied to urban bridge and tunnel construction.
The traditional bored pile pore-forming generally adopts a temporary steel pile casing with a pore opening of 2-4 m long for construction, adopts slurry for wall protection for construction, and can be formed by pulling out the steel pile casing after the pore-forming is finished and the concrete pouring is finished. But under certain conditions, the steel casing is not allowed to be pulled out, either administrative or technical; the related property units require lengthening the steel pile casing, and in order to ensure that holes are not collapsed, the pile casing is not allowed to be pulled out, or a large-diameter bored pile is constructed under the environment of large-layer-depth flow plastic-shaped sludge, the conventional slurry wall is at a certain risk of collapsing holes, such as 20-30 m in Guangzhou southern sand area, the phenomenon of collapsing holes, reaming holes or shrinkage holes can occur in the construction process if special measures are not taken, and at present, the steel pile casing is designed to be a single-layer pile casing in engineering, which is basically consistent with the inner pile casing (1) in the patent. According to relevant specifications and engineering experience, the wall thickness of the pile casing needs to reach 1/120-1/100 of the diameter to meet the engineering requirement, and the steel pile casing in the form is simple in structure, convenient to construct, safe and reliable. The disadvantage is that when used as a disposable consumable, the engineering cost is high, accounting for 1/3 of the cost of one pile.
To save costs, related solutions are also being studied in the industry. The more common methods are:
1. for forming holes in a fluidized bed of sludge
1. The method has the problems that the conventional steel pile casing is pulled out by adopting a vibrating hammer, the pile casing is pulled out before initial setting after concrete pouring, early concrete collapse occurs, the phenomenon that a pile foundation reinforcement cage protective layer is insufficient or even a pile is broken occurs, and the solidified concrete is directly damaged or cannot be pulled out. Even if the pile pulling time is well mastered, when the pile diameter is large, the pile casing is longer than 10 meters, and the pile foundation concrete pile casing pulling can not be basically realized.
2. The method has the advantages that the specific gravity of slurry is increased, the rotary drill is adopted for construction, the drilling speed is accurately controlled, the pile forming speed is low, the mechanical cost is increased by the slurry with large specific gravity, and the risk of hole collapse is still certain.
3. A long-rod auger post-insertion reinforcement cage method is used. The method has the problems that the diameter of the pile is required to be smaller than 1.0 meter, the length of the pile is required to be smaller than 25 meters, and the requirements of most bridge pile foundations are difficult to meet.
4. And (3) conventional construction, and repeatedly adjusting the construction process to take the risk as a price to obtain higher economic return rate. The soil body stress has larger uncertainty, although some construction units lengthen the temporary construction steel pile casing to about 5 meters, conventional construction is adopted, the construction process is repeatedly adjusted, and more successful pile forming cases exist, but in the same method, the same construction team also frequently generates hole collapse and pile breaking engineering accidents, and more uncertain risks are brought to engineering management.
2. The steel casing is not allowed to be pulled out in administrative or technical aspects
Even if the geology is better, when the pile foundation is close to important buildings such as subways, high-pressure gas pipes and the like, the relevant property units are guaranteed to be in no loss, the steel casing is required to be arranged and the extraction is not allowed.
If the geology is better, the construction is proper, the collapse of the steel casing is a small probability event, and in front of the high casing cost, some construction units adventure the construction, and more successful cases are really obtained, but the related units are actually allowed to bear risks, so that the construction units are not advisable.
Although there are some better pore forming methods at present, the problems of high cost and high risk are not solved. Therefore, it is also highly desirable to develop a low cost, low risk casing construction solution.
Disclosure of Invention
The utility model aims to provide a combined stiffening steel pile casing for bored pile construction, which has the advantages of low cost, solves the problems that the prior bored pile is generally constructed by adopting a temporary steel pile casing with an orifice of 2-4 m and adopting a slurry pile casing wall, and the pile can be formed by pulling out the steel pile casing after the hole forming is finished and the concrete pouring is finished.
In order to achieve the above purpose, the present utility model provides the following technical solutions: a combined stiffening steel pile casing for bored pile construction, includes interior pile casing, interior pile casing's surface cover is equipped with outer pile casing, the inside welding of outer pile casing has the hoop angle steel of putting more energy into, the bottom of outer pile casing is provided with the angle steel of strengthening, the inside of angle steel of strengthening is provided with down the stiffening steel plate, the inside of outer pile casing is provided with the stiffening steel plate, and interior pile casing and lower stiffening steel plate joint.
The utility model further provides that the annular stiffening angle steel adopts annular angle steel with the diameter of 30 multiplied by 3 mm.
The technical scheme is adopted: the inner protective cylinder is prevented from instable external pressing plate equipment when being driven to move downwards by the inner protective cylinder.
The utility model further provides that the wall thickness of the inner protective cylinder is larger than that of the outer protective cylinder, the inner protective cylinder is recycled, and the outer protective cylinder is disposable.
The technical scheme is adopted: the outer casing pipe wall is thin, low in cost, not pulled out, pulled out before the concrete is poured after the inner casing is drilled, and can be recycled, so that the inner casing can provide vertical rigidity in the construction process, and the outer casing provides circumferential rigidity in the construction process.
The utility model is further provided that the edge angle reinforcing steel ring, the lower stiffening steel plate and the upper stiffening steel plate are all connected with the annular stiffening angle steel at the bottom of the outer casing by welding, and the lower stiffening steel plates are arranged at an annular interval of 200 mm.
The technical scheme is adopted: and limiting and supporting the inner casing.
The utility model is further arranged such that the length of the inner casing is greater than the length of the outer casing.
The technical scheme is adopted: the external machine can conveniently apply force to the inner casing, so that the inner casing can generate force to the outer casing.
Compared with the prior art, the utility model has the following beneficial effects:
according to the utility model, through the design of dividing the steel casing into the inner casing and the outer casing, the inner casing is used as a construction process tool, vertical rigidity in the first stage is mainly provided, traction force is provided for the outer casing under the action of the upper stiffening steel plate and the lower stiffening steel plate on the edge angle reinforcing steel ring of the outer casing, the outer casing steel plate is vertically subjected to tension rather than pressure in the pore-forming process, no instability phenomenon exists, when the stress enters the second stage after the pore-forming is completed, the inner casing is pulled out, only the outer casing is left to serve as a protection wall for use when the vertical rigidity of the casing is not needed, and the outer casing only needs to provide circumferential rigidity, can be realized by a lower cost structure, has high rigidity and high cost, but can be repeatedly used, so that the aims of reliable technology and low cost can be realized through the device.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
fig. 2 is a cross-sectional view of the structure of the present utility model.
In the figure: 1. an inner casing; 2. an outer casing; 3. annular stiffening angle steel; 4. edge angle reinforcing steel ring; 5. lower stiffening steel plates; 6. and (5) upper stiffening steel plates.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Example 1:
referring to fig. 1 and 2, a combined stiffening steel pile casing for bored pile construction comprises an inner pile casing 1, wherein the wall thickness of the inner pile casing 1 is larger than that of an outer pile casing 2, the inner pile casing 1 is recycled, the outer pile casing 2 is disposable, the pipe wall thickness of the outer pile casing 2 is low in cost and is not pulled out, the inner pile casing 1 is pulled out before concrete is poured after drilling is finished, and can be recycled, so that the inner pile casing 1 provides vertical rigidity in the construction process, the outer pile casing 2 provides circumferential rigidity in the construction process, the surface of the inner pile casing 1 is sleeved with the outer pile casing 2, the wall thickness of the outer pile casing 2 is designed to be 3mm, the inner part of the outer pile casing 2 is welded with circumferential stiffening angle steel 3, the circumferential stiffening angle steel 3 adopts 30 x 3mm annular angle steel, the protection is interior pile casing 1 drags outer pile casing 2 and moves down in the time, interior pile casing 1 guarantee is interior pile casing drives outer pile casing and moves down in the time, interior pile casing can not take place outside clamp plate equipment unstability, skew, the bottom of outer pile casing 2 is provided with the angle and strengthens steel ring 4, angle is strengthened steel ring 4, lower stiffening steel plate 5 and go up stiffening steel plate 6 all through the welding with the hoop angle 3 that stiffens of outer pile casing 2 bottom, and lower stiffening steel plate 5 is arranged according to hoop interval 200mm, spacing and support interior pile casing 1, the inside of angle is strengthened steel plate 5 down, the inside of outer pile casing 2 is provided with stiffening steel plate 6, and interior pile casing 1 and lower stiffening steel plate 5 joint, the length of interior pile casing 1 is greater than the length of outer pile casing 2, make things convenient for the external machine to carry out effort to interior pile casing 1, thereby make interior pile casing 1 produce the effort of outer pile casing 2.
Pile foundation pore-forming construction, pile casing atress divides two stages:
a first entering stage: the friction resistance needs to be overcome, the pile driver or the vibration hammer is arranged at the top of the steel pile casing, the friction resistance exists on the upward path from the bottom of the steel pile casing, the steel pile casing is pressed by the steel plate, the steel pile casing is easy to unstably, and the steel pile casing needs to provide larger vertical rigidity.
The second dado stage: at this time, the hole forming is completed, the pile casing is stressed by radial pressure, and the steel pile casing is ensured to have enough circumferential rigidity, so that the strong vertical rigidity required in the first stage is not required.
The use process is briefly described: through the design of the steel casing part inner casing 1 and the outer casing 2, the inner casing 1 is used as a vertical rigidity bearing body to provide downward traction force for the outer casing 2, so that an outer cylinder steel plate vertically bears tension force instead of pressure force in the pore-forming process, the instability phenomenon does not exist, when the force enters the second stage after the pore-forming is completed, when the vertical rigidity of the casing is not needed any more, the inner casing 1 is pulled out, and only the outer cylinder is left for the use as a protection wall, and because the outer casing 2 only needs to provide circumferential rigidity, the annular rigidity can be realized by a lower cost structure, the inner casing 1 has high rigidity and high cost, but can be repeatedly used, and therefore, the device can realize the aims of reliable technology and low cost.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A combined stiffening steel pile casing for bored pile construction, includes interior pile casing (1), its characterized in that: the surface cover of interior section of thick bamboo (1) is equipped with outer section of thick bamboo (2) of protecting, the inside welding of outer section of thick bamboo (2) has hoop angle steel (3) of putting more than, the bottom of outer section of thick bamboo (2) is provided with angle steel (4) of strengthening, the inside of angle steel (4) is provided with down stiffening steel (5), the inside of outer section of thick bamboo (2) of protecting is provided with stiffening steel (6), and interior section of thick bamboo (1) and lower stiffening steel (5) joint.
2. A modular stiffening steel casing for use in bored pile construction as set forth in claim 1, wherein: the annular stiffening angle steel (3) is 30 multiplied by 3mm annular angle steel.
3. A modular stiffening steel casing for use in bored pile construction as set forth in claim 1, wherein: the wall thickness of the inner protective cylinder (1) is larger than that of the outer protective cylinder (2), the inner protective cylinder (1) is recycled, and the outer protective cylinder (2) is disposable.
4. A modular stiffening steel casing for use in bored pile construction as set forth in claim 1, wherein: the edge angle reinforcing steel ring (4), the lower stiffening steel plate (5) and the upper stiffening steel plate (6) are all connected with the annular stiffening angle steel (3) at the bottom of the outer casing (2) through welding, and the lower stiffening steel plates (5) are arranged at an annular interval of 200 mm.
5. A modular stiffening steel casing for use in bored pile construction as set forth in claim 1, wherein: the length of the inner protective cylinder (1) is longer than that of the outer protective cylinder (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223206693.9U CN218911391U (en) | 2022-11-30 | 2022-11-30 | Combined stiffening steel pile casing for bored pile construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223206693.9U CN218911391U (en) | 2022-11-30 | 2022-11-30 | Combined stiffening steel pile casing for bored pile construction |
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| Publication Number | Publication Date |
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| CN218911391U true CN218911391U (en) | 2023-04-25 |
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| CN202223206693.9U Active CN218911391U (en) | 2022-11-30 | 2022-11-30 | Combined stiffening steel pile casing for bored pile construction |
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- 2022-11-30 CN CN202223206693.9U patent/CN218911391U/en active Active
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