CN211873034U - Box-type buckling steel pile supporting structure - Google Patents
Box-type buckling steel pile supporting structure Download PDFInfo
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- CN211873034U CN211873034U CN202020370847.XU CN202020370847U CN211873034U CN 211873034 U CN211873034 U CN 211873034U CN 202020370847 U CN202020370847 U CN 202020370847U CN 211873034 U CN211873034 U CN 211873034U
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Abstract
The utility model discloses a box lock joint piling bar supporting construction, including the box piling bar, the box piling bar include large cross-section box piling bar, large cross-section box piling bar lock joint on small-section box piling bar, large cross-section box piling bar and small-section box piling bar link into continuous steel wall through both ends lock joint, form a whole supporting construction. The utility model discloses a lock joint of box piling bar self is connected, and the extension infiltration route reduces foundation ditch or river bank infiltration, the probability of leaking. The box-type steel piles with the large and small cross sections are buckled with each other to form a continuous box-type steel wall, the bending rigidity of the continuous box-type steel wall is greatly increased compared with that of the traditional U-shaped steel sheet pile or H-shaped steel pile, the deformation of a foundation pit or a river bank is favorably resisted, the width of a supporting structure can be reduced, and the utilization rate of an underground space is increased. The utility model has the advantages of bending resistance is good, bear the weight of dynamic height, construction speed is fast, the structure combination is convenient, box piling bar reuse, its technological economic benefits is outstanding.
Description
Technical Field
The utility model relates to a geotechnical engineering technical field specifically is a temporary or permanent construction engineering such as be applicable to pier, bridge engineering cofferdam, utility tunnel, flood control cutout and excavation supporting, is particularly useful for a box lock joint piling bar supporting construction who requires high, construction period tight foundation ditch engineering and small-size underground garage very much to strutting the deformation.
Background
In recent years, along with urban congestion, parking places in communities are difficult to obtain, underground pipelines are insufficient, urban inland inundation and other problems are highlighted, underground engineering construction in China is rapidly started, basement construction areas are larger and deeper, and problems of low construction speed, long maintenance period, serious mud pollution and the like exist when traditional cast-in-situ bored piles are adopted for foundation pit supporting. Therefore, the energy-saving and environment-friendly construction method becomes the primary consideration of engineering construction. In view of this, the steel sheet piles are used for supporting foundation pits more and more, but the cross section and the rigidity of the conventional U-shaped Larsen steel sheet pile are very small, and when the U-shaped Larsen steel sheet pile is adopted in a large-area deep foundation pit, the foundation pit is deformed too much, and safety risks exist. At present, a combined steel sheet pile of a U-shaped Larsen steel sheet pile and an H-shaped steel pile is adopted in the engineering, namely, the H-shaped steel pile is constructed on the inner side surface or the outer side surface of the U-shaped steel sheet pile along the length direction of the U-shaped Larsen steel sheet pile.
In order to effectively solve the problem that a conventional steel sheet pile is used for foundation pit support and guarantee the safety of foundation pit construction, a box-type buckling steel pile supporting structure and a construction method are provided, so that the safety of foundation pit construction is guaranteed, and the construction cost is saved.
Disclosure of Invention
For solving the problem that exists among the above-mentioned prior art, the utility model provides a box lock joint piling bar supporting construction.
The purpose of the utility model is realized like this:
a box-type buckled steel pile supporting structure comprises a box-type steel pile A, wherein the box-type steel pile A comprises a large-section box-type steel pile 1, the large-section box-type steel pile 1 is buckled on a small-section box-type steel pile 2, and the large-section box-type steel pile 1 and the small-section box-type steel pile 2 are buckled and connected into a continuous steel wall through two ends to form an integral supporting structure;
the middle belly of the box-type steel pile A is a rectangular cavity, four right-angle sides of the rectangle are respectively provided with a cantilever, and 4 cantilevers of the four right-angle sides are symmetrically distributed along the central line of the rectangle;
the tail ends of 4 cantilevers of the box-type steel pile A are provided with semicircular locking notches; the semi-circular locking notch at the tail end of the cantilever of the small-section box-type steel pile 2 faces outwards, and the semi-circular locking notch at the tail end of the cantilever of the large-section box-type steel pile 1 faces inwards;
the length of a cantilever of each of the four right-angle sides of the rectangle is 0.375 times of the length of the short side of the rectangle, and the length of the short side of the box-type steel pile A is 0.6-0.8 times of the length of the long side; the specific size of the section of the box-type steel pile A is determined by calculation according to the engineering geological condition;
the large-section box-type steel pile 1 and the small-section box-type steel pile 2 are made of the same material, and the wall thickness of the large-section box-type steel pile 1 is the same as that of the small-section box-type steel pile 2;
the construction method of the box-type buckled steel pile supporting structure sequentially comprises the steps of construction organization design, measurement and control paying-off, mechanical deployment, box-type steel pile A processing, H-shaped steel purlin 5 manufacturing, box-type steel pile insertion construction, foundation pit earthwork excavation, in-pit supporting structure construction, foundation slab construction, upward construction of a building main body structure, in-pit supporting structure dismantling and foundation pit earthwork backfilling, wherein the box-type buckled steel pile supporting structure is constructed by the following steps:
s1, determining the wall thickness, the section size and the pile length of a box-type steel pile through calculation and analysis by combining the area, the character and the depth of a proposed foundation pit, protection objects around the foundation pit, rock soil and hydrological conditions, and determining the longitudinal and transverse positions;
s2, according to the position of the box-type steel pile determined by design, after the measurement, the paying-off and the positioning are carried out, whether underground pipelines and obstacles exist in the range of the construction box-type steel pile is checked; simultaneously pouring a plain concrete hardened pavement on the earth surface of the construction site, and preparing a measurement control net and a leveling base point;
s3, installing 2 guide beams on two transverse sides of the box-type steel pile for limiting the box-type steel pile to move, pressing 2 box-type steel piles into the determined positions to serve as longitudinal guide piles, forming a guide frame for inserting the box-type steel pile through the transverse guide beams and the longitudinal guide piles, and controlling the positioning accuracy of the box-type steel pile;
s4, before inserting the box-type steel piles A, coating grease in all locking openings of the box-type steel piles A, then inserting 10-15 box-type steel piles into a guide frame in rows to form a screen shape, and then sequentially inserting the box-type steel piles one by one in a construction mode of combining a crawler crane with a hydraulic vibration hammer and a static pressure pile planting machine;
s5, after the box-type steel pile is inserted, the water-sealing performance of the pile body is checked in time, and the water leakage position is welded and repaired;
s6, after the tightness inspection of the box-type steel piles is finished, earthwork in the foundation pit is excavated in a layered, block and symmetrical mode, and according to design requirements and according to the earthwork excavation progress, an H-shaped steel purlin 5 or an inner support in the horizontal direction in the pit is arranged; meanwhile, a steel triangular bracket 7 is arranged below the H-shaped steel purlin 5;
s7, after earthwork in the whole foundation pit is excavated to the elevation of the foundation bottom, pouring a basement foundation bottom plate, constructing a basement main body structure upwards, and forming a support changing structure layer by layer;
and S8, constructing the basement structure layer by layer from bottom to top according to the design working condition until the construction reaches +/-0.000, and backfilling earth in the construction operation space between the basement and the support piles after the basement main body structure is constructed out of the ground.
Has the positive and beneficial effects that: 1. the utility model adopts the method that the hollow box-type lock joint type steel pile is used for supporting the system, mud dripping and dust pollution do not exist in all box-type steel pile construction processes, and the concept of green construction is realized; 2. all box-type steel piles are completely pulled out after the engineering is finished, so that the soil body is not polluted; the steel piles can be repeatedly used and leased according to the amount and time, so that one-time investment of capital is avoided, and the purpose of less capital and multi-cycle cyclic income is realized; 3. compared with a U-shaped Larsen steel pile and an H-shaped steel pile, the empty stomach of the box-shaped steel pile improves the section inertia moment, gives full play to the advantage of large rectangular shape inertia moment, and achieves the effects of smaller section of a supporting structure and larger deformation resistance; 4. compared with the U-shaped Larsen steel pile, the box-shaped steel pile is fastened by the large box-shaped steel pile and the small box-shaped steel pile, and two waterproof seams are formed on one section perpendicular to the excavation surface of the foundation pit, so that the leakage path of underground water is increased, and the leakage risk is reduced; 5. the utility model not only solves the problem that the large-area deep foundation pit supporting structure is thrown into once and pollutes soil, realizes the green and environment-friendly construction process, but also provides a large-area deep foundation pit construction method; the method is simple and easy to implement, the procedure conversion and connection are simple and reliable, the supporting structure does not need to be maintained, the working efficiency is effectively improved, and the method has prominent substantive characteristics and remarkable progress.
Drawings
FIG. 1 is a schematic view of the overall structure of an embodiment of the present invention;
FIG. 2 is a schematic view of locking and fastening a box-type steel pile;
fig. 3 is a schematic diagram of box-type steel pile foundation pit support.
In the figure, the amount: the steel pile locking structure comprises a large-section box-type steel pile 1, a small-section box-type steel pile 2, a small-section box-type steel pile locking notch 3, a large-section box-type steel pile locking notch 4, a steel purlin 5, an inner support 6 and a steel triangular bracket 7.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings and specific embodiments:
as shown in fig. 1-3, a box-type buckled steel pile supporting structure comprises a box-type steel pile a, wherein the box-type steel pile a comprises a large-section box-type steel pile 1, the large-section box-type steel pile 1 is buckled on a small-section box-type steel pile 2, and the large-section box-type steel pile 1 and the small-section box-type steel pile 2 are buckled and connected into a continuous steel wall through two ends to form an integral supporting structure;
the middle belly of the box-type steel pile A is a rectangular cavity, four right-angle sides of the rectangle are respectively provided with a cantilever, and 4 cantilevers of the four right-angle sides are symmetrically distributed along the central line of the rectangle;
the tail ends of 4 cantilevers of the box-type steel pile A are provided with semicircular locking notches; the semi-circular locking notch at the tail end of the cantilever of the small-section box-type steel pile 2 faces outwards, and the semi-circular locking notch at the tail end of the cantilever of the large-section box-type steel pile 1 faces inwards;
the length of a cantilever of each of the four right-angle sides of the rectangle is 0.375 times of the length of the short side of the rectangle, and the length of the short side of the box-type steel pile A is 0.6-0.8 times of the length of the long side; the specific size of the section of the box-type steel pile A is determined by calculation according to the engineering geological condition;
the large-section box-type steel pile 1 and the small-section box-type steel pile 2 are made of the same material, and the wall thickness of the large-section box-type steel pile 1 is the same as that of the small-section box-type steel pile 2;
the construction method of the box-type buckled steel pile supporting structure sequentially comprises the steps of construction organization design, measurement and control paying-off, mechanical deployment, box-type steel pile A processing, H-shaped steel purlin 5 manufacturing, box-type steel pile insertion construction, foundation pit earthwork excavation, in-pit supporting structure construction, foundation slab construction, upward construction of a building main body structure, in-pit supporting structure dismantling and foundation pit earthwork backfilling, wherein the box-type buckled steel pile supporting structure is constructed by the following steps:
s1, determining the wall thickness, the section size and the pile length of a box-type steel pile through calculation and analysis by combining the area, the character and the depth of a proposed foundation pit, protection objects around the foundation pit, rock soil and hydrological conditions, and determining the longitudinal and transverse positions;
s2, according to the position of the box-type steel pile determined by design, after the measurement, the paying-off and the positioning are carried out, whether underground pipelines and obstacles exist in the range of the construction box-type steel pile is checked; simultaneously pouring a plain concrete hardened pavement on the earth surface of the construction site, and preparing a measurement control net and a leveling base point;
s3, installing 2 guide beams on two transverse sides of the box-type steel pile for limiting the box-type steel pile to move, pressing 2 box-type steel piles into the determined positions to serve as longitudinal guide piles, forming a guide frame for inserting the box-type steel pile through the transverse guide beams and the longitudinal guide piles, and controlling the positioning accuracy of the box-type steel pile;
s4, before inserting the box-type steel piles A, coating grease in all locking openings of the box-type steel piles A, then inserting 10-15 box-type steel piles into a guide frame in rows to form a screen shape, and then sequentially inserting the box-type steel piles one by one in a construction mode of combining a crawler crane with a hydraulic vibration hammer and a static pressure pile planting machine;
s5, after the box-type steel pile is inserted, the water-sealing performance of the pile body is checked in time, and the water leakage position is welded and repaired;
s6, after the tightness inspection of the box-type steel piles is finished, earthwork in the foundation pit is excavated in a layered, block and symmetrical mode, and according to design requirements and according to the earthwork excavation progress, an H-shaped steel purlin 5 or an inner support in the horizontal direction in the pit is arranged;
s7, after earthwork in the whole foundation pit is excavated to the elevation of the foundation bottom, pouring a basement foundation bottom plate, constructing a basement main body structure upwards, and forming a support changing structure layer by layer;
and S8, constructing the basement structure layer by layer from bottom to top according to the design working condition until the construction reaches +/-0.000, and backfilling earth in the construction operation space between the basement and the support piles after the basement main body structure is constructed out of the ground.
Example 1
Taking the Nanjing Pukou gold base G14 plot project as an example, the project belongs to a large-area deep foundation pit, the periphery of the site is provided with roads, and the requirements on deformation and leakage of a supporting structure are high. In response to the requirements of engineering safety and environmental protection, the foundation pit supporting structure adopts a box type steel pile system, and the concrete construction steps of the engineering are as follows:
firstly, comprehensively planning the excavation area and depth of a foundation pit, the shape of a side line, roads, pipelines and the like to be protected at the periphery of the foundation pit, the properties of rock soil and underground water, determining the wall thickness, the section size and the pile length of a box-type steel pile through calculation and analysis, and determining the longitudinal and transverse positions, wherein the width of a short side of the common box-type steel pile is 400, 500 and 600mm, and the side length of the short side of the box-type steel pile is 0.6-0.8 times of that of a long side;
the method comprises the steps of determining the size and the wall thickness of a box-type steel pile according to design calculation, processing the required steel pile in a factory, determining the site construction position of the box-type steel pile according to a design drawing, measuring the starting point and the end point of the central line of the box-type steel pile on site, controlling a central pile, fixing the central pile by using a timber pile, and setting a central nail of a pile top nail.
Before the box-type steel pile A is inserted into construction, whether underground pipelines and barriers exist in the range of the constructed box-type steel pile is checked. Simultaneously pouring a plain concrete hardened pavement on the earth surface of the construction site, and preparing a measurement control net and a leveling base point;
2 guide beams are arranged on two transverse sides of each box-type steel pile and used for limiting the box-type steel piles to move, 2 box-type steel piles are pressed into the determined positions to serve as longitudinal guide piles, a guide frame for inserting the box-type steel piles is formed through the transverse guide beams and the longitudinal guide piles, and the positioning accuracy of the box-type steel piles is controlled;
before inserting the box-type steel piles, the box-type steel piles are inspected one by one, and grease is coated in all locking openings of the box-type steel piles. Then inserting 10-15 box-type steel piles into the guide frame in rows to form a screen, then adopting a crawler crane combined with a hydraulic vibration hammer, a static pressure pile planting machine and other modes, adopting a large-section box-type steel pile 1 and a small-section box-type steel pile 2, tightly buckling through a locking opening 3 and a locking opening 4, and then sequentially inserting all the box-type steel piles one by one to a designed elevation;
after the box-type steel pile is inserted, the buckling condition of each position of the large-section box-type steel pile locking notch 4 and the small-section box-type steel pile locking notch 3 is checked in time, so that the tight buckling is ensured, and a water-tight structure is formed. If water leakage exists, repairing;
after the tightness inspection of the box-type steel piles is finished, earthwork in a foundation pit is excavated in a layered, blocked and symmetrical mode, according to design requirements, an H-shaped steel enclosing purlin 5 or an inner support 6 in the pit in the horizontal direction is arranged according to the earthwork excavation progress, and meanwhile, a steel triangular bracket 7 is arranged below the H-shaped steel enclosing purlin 5;
and after earth in the whole foundation pit is excavated to the elevation of the foundation bottom, pouring bottom plate concrete. And (3) when the strength of the basement foundation base plate reaches 50% of the design strength, upwards constructing the basement structure, dismantling the basement foundation pit support H-shaped steel purlin 5 or the inner support 6 layer by layer from bottom to top according to the design working condition layer by layer until +/-0.000 is constructed, and backfilling the construction operation space between the basement foundation pit support pile and the basement outer wall.
And (4) removing all box-type steel piles by using a pulling device, and treating the holes after pile pulling by adopting modes such as grouting and the like.
The utility model adopts the method that the hollow box-type lock joint type steel pile is used for supporting the system, mud dripping and dust pollution do not exist in all box-type steel pile construction processes, and the concept of green construction is realized; all box-type steel piles are completely pulled out after the engineering is finished, so that the soil body is not polluted; the steel piles can be repeatedly used and leased according to the amount and time, so that one-time investment of capital is avoided, and the purpose of less capital and multi-cycle cyclic income is realized; compared with a U-shaped Larsen steel pile and an H-shaped steel pile, the empty stomach of the box-shaped steel pile improves the section inertia moment, gives full play to the advantage of large rectangular shape inertia moment, and achieves the effects of smaller section of a supporting structure and larger deformation resistance; compared with the U-shaped Larsen steel pile, the box-shaped steel pile is fastened by the large box-shaped steel pile and the small box-shaped steel pile, and two waterproof seams are formed on one section perpendicular to the excavation surface of the foundation pit, so that the leakage path of underground water is increased, and the leakage risk is reduced; the utility model not only solves the problem that the large-area deep foundation pit supporting structure is thrown into once and pollutes soil, realizes the green and environment-friendly construction process, but also provides a large-area deep foundation pit construction method; the method is simple and easy to implement, the procedure conversion and connection are simple and reliable, the supporting structure does not need to be maintained, the working efficiency is effectively improved, and the method has prominent substantive characteristics and remarkable progress.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (5)
1. The utility model provides a box lock joint piling bar supporting construction which characterized in that: the box-type steel pile support structure comprises a box-type steel pile (A), wherein the box-type steel pile (A) comprises a large-section box-type steel pile (1), the large-section box-type steel pile (1) is fastened on a small-section box-type steel pile (2), and the large-section box-type steel pile (1) and the small-section box-type steel pile (2) are fastened at two ends to form a continuous steel wall, so that an integral support structure is formed.
2. A box-fastened steel pile supporting structure according to claim 1, wherein: the box type steel pile (A) middle belly is the rectangle cavity, four right-angle sides of rectangle have the cantilever respectively, and 4 cantilevers on four right-angle sides use rectangle central line symmetric distribution.
3. A box-fastened steel pile supporting structure according to claim 1, wherein: the tail ends of 4 cantilevers of the box-type steel pile (A) are provided with semicircular locking notches; the semi-circular fore shaft at the tail end of the cantilever of the small-section box-type steel pile (2) is outward, and the semi-circular fore shaft at the tail end of the cantilever of the large-section box-type steel pile (1) is inward.
4. A box-fastened steel pile supporting structure according to claim 2, wherein: the length of a cantilever on each of the four right-angle sides of the rectangle is 0.375 times of the length of the short side of the rectangle, and the length of the short side of the box-type steel pile (A) is 0.6-0.8 times of the length of the long side; the specific size of the section of the box-type steel pile (A) is determined by calculation according to engineering geological conditions.
5. A box-fastened steel pile supporting structure according to claim 1, wherein: the large-section box-type steel pile (1) and the small-section box-type steel pile (2) are made of the same material, and the wall thickness of the large-section box-type steel pile (1) is the same as that of the small-section box-type steel pile (2).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111173003A (en) * | 2020-03-23 | 2020-05-19 | 南京市测绘勘察研究院股份有限公司 | Box-type buckling steel pile supporting structure and construction method |
| CN113136857A (en) * | 2021-04-17 | 2021-07-20 | 远强地基工程(天津)股份有限公司 | PC construction method pile and construction process thereof |
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2020
- 2020-03-23 CN CN202020370847.XU patent/CN211873034U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111173003A (en) * | 2020-03-23 | 2020-05-19 | 南京市测绘勘察研究院股份有限公司 | Box-type buckling steel pile supporting structure and construction method |
| CN113136857A (en) * | 2021-04-17 | 2021-07-20 | 远强地基工程(天津)股份有限公司 | PC construction method pile and construction process thereof |
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