A frozen soil construction assembled building foundation structure

Abstract

A prefabricated building foundation structure for frozen soil construction relates to a building foundation structure on frozen soil, wherein a cylinder (15) is provided with a plurality of channel steels (16) around it, and a U-shaped tube (11) is provided on the outer surface of the cylinder between two channel steels; a foundation pit (19) is excavated on the frozen soil surface (12), and cast-in-situ concrete (21) is poured into the bottom of the foundation pit, a prefabricated concrete pile (14) is placed in the foundation pit, a cavity (25) of the lower cylinder of the end plate (1) is sleeved on the prefabricated concrete pile, soil from the excavated pit is used to fill the cylinder, and the backfill soil (17) is compacted; an adjustment ring (7) sleeved on the plurality of channel steels is used to tightly connect the lower surface of the adjustment ring with the ground surface using a tightening screw (6); two upper pipe openings of the U-shaped tube are connected to a cold air inlet and an exhaust outlet respectively; the present invention provides a height adjustment screw for adjusting the height of the end plate on the upper plate of the cylinder to overcome the settlement adjustment of a single foundation pile, and the height of the adjustment ring is controlled by the tightening screw to adjust the instability caused by the ground surface settlement.

Description

Technical Field

[0001] The present invention relates to a building foundation structure on frozen soil, and in particular to an assembled building foundation structure constructed on frozen soil. Background Art

[0002] It is well known that there are many permafrost zones distributed in large areas of Tibet, Qinghai, Yunnan, western Sichuan and southwestern Xinjiang. The thickness of the permafrost mostly ranges from more than ten meters to forty or fifty meters. In order to carry out scientific research, weather research, mineral drilling and the residence of various researchers, it is necessary to build some construction facilities or install equipment in these areas. The safety and minimization of the impact of building various facilities on permafrost are important issues; the problems faced in actual construction include frost heave, thawing, settlement or thermal disturbance caused by human activities and buildings, especially the stability of the foundation piles of buildings, which bears the heavy responsibility for the stability and long-term use of the buildings; there is currently no public literature on the treatment of diseases caused by the settlement of foundation piles. Summary of the Invention

[0003] The purpose of the present invention is to overcome the existing deficiencies. The present invention discloses a prefabricated building foundation structure for frozen soil construction. The settlement adjustment of a single foundation pile is overcome by arranging a height adjustment screw for adjusting the end plate height on the upper plate of the cylinder, and the height of the adjustment ring is controlled by the tightening screw to adjust the instability caused by surface settlement.

[0004] In order to achieve the purpose of the present invention, this application discloses the following technical solutions:

[0005] A prefabricated building foundation structure constructed on frozen soil, wherein a plurality of channel steels with inward notches are arranged at intervals around the cylinder, the upper ends of the plurality of channel steels are fixedly connected to the lower surface of the end plate, a gap is left between the upper plate of the cylinder and the lower surface of the end plate, and a U-shaped tube is provided on the outer surface of the cylinder between two channel steels; a foundation pit of the required depth is excavated on the frozen soil surface, an appropriate amount of cast-in-place concrete is poured into the bottom of the foundation pit, the concrete pier and the upper prefabricated concrete piles are completely placed in the foundation pit, and the end plate is lifted by a sling to lower the end plate. The cavity of the upper cylinder is put on the concrete precast pile, and the height adjustment screw is passed through the height adjustment screw hole of the upper plate at the upper end of the cylinder and pressed against the upper end surface of the concrete precast pile to make the cylinder at an appropriate height; the soil from the excavated pit is filled into the cylinder and the backfill soil is compacted; the adjusting ring is put on the upper part of multiple channel steels and the lower surface of the adjusting ring is attached to the ground surface, and the tightening screws on the channel steel are used to make the lower surface of the adjusting ring tightly connected to the ground surface; then the two upper pipe openings of each U-shaped tube are adjusted, one is connected to the cold air inlet, and the other is the exhaust outlet.

[0006] The described frozen soil construction prefabricated building foundation structure has four channel steels arranged at intervals and with grooves facing inward connected on all sides of the cylinder by welding; four U-shaped tubes are located on the outer wall of the cylinder between the four channel steels, and a bottom ring is fixed on the outer wall of the lower end of the cylinder, and the lower ends of the four channel steels are fixedly connected to the bottom ring, and the bending parts of the lower ends of the four U-shaped tubes are close to the upper surface of the bottom ring.

[0007] The described frozen soil construction prefabricated building foundation structure has a middle hole of the adjusting ring that is sleeved on the upper part of the outer surface of multiple channel steels, and locking screw holes are respectively provided on the upper part of the outer side surfaces of the multiple channel steels. The fixing screws are respectively passed through the light holes of the four "L"-shaped plate vertical plates and then connected to the locking screw holes of the channel steels; tightening screw holes are provided on the flat plates of the four "L"-shaped plates, and the tightening screws are passed through the tightening screw holes and pressed against the upper surface of the adjusting ring.

[0008] In the frozen soil construction prefabricated building foundation structure, the upper surface of the adjusting ring is provided with a plurality of blind holes corresponding to the lower ends of the tightening screws, and the lower ends of the tightening screws are pressed into the blind holes.

[0009] The frozen soil construction prefabricated building foundation structure is provided with internal threads on the two upper pipe ends of the U-shaped tube. One of the two upper pipe ends of the U-shaped tube is connected to the refrigeration equipment through a pipeline to obtain cold air; or it is connected to the fan through a pipeline to allow natural cold air to be supplied at night. The other exhaust port can be closed during the day to keep the U-shaped tube warm.

[0010] The frozen soil construction prefabricated building foundation structure is provided with a hoisting hole in the middle of the end plate, and the hoisting hole is used for installing the hoisting rope during lifting, installing the height adjustment screw and installing the building base plate.

[0011] The frozen soil construction prefabricated building foundation structure is provided with a lifting groove near the upper end outer edge of the precast concrete pile.

[0012] The frozen soil construction prefabricated building foundation structure is provided with an iron plate on the upper end surface of the precast concrete pile, and a pit corresponding to the lower end of the height adjustment screw is provided in the middle of the iron plate.

[0013] Through the above disclosure, the beneficial effects of the present invention are:

[0014] The prefabricated building foundation structure constructed on frozen soil described in the present invention utilizes the strong supporting force formed by the concrete piers with enlarged diameters relative to the precast concrete piles and the cast-in-place concrete to ensure the stability of the building. When used in areas with relatively low altitudes, refrigeration equipment can be used to forcibly cool the frozen soil. When used in high-altitude areas, natural cooling air can be used to cool the frozen soil by delivering cold air through a fan. The present invention can also use a heat rod to replace the U-shaped tube; the present invention arranges an adjustment screw on the upper plate of the cylinder to adjust the height of the end plate. When the precast concrete pile of a single foundation pile sinks, the height of the cylinder is maintained by adjusting the height of the adjustment screw to prevent the building from settling; when seasonal mild melting occurs on the surface of the ground, the present invention uses a tightening screw to control the height of the adjustment ring to adjust the instability caused by surface settlement. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention;

[0016] Figure 2 It is a schematic diagram of the three-dimensional structure of the cylinder, channel steel and U-shaped tube of the present invention;

[0017] Figure 3 It is a structural schematic diagram of the U-shaped tube of the present invention;

[0018] Figure 4 It is a cross-sectional schematic diagram of the cylinder, channel steel and U-shaped tube of the present invention;

[0019] Figure 5 It is a schematic diagram of the three-dimensional structure of the adjustment ring of the present invention;

[0020] Figure 6 This is a schematic diagram of the three-dimensional structure of the "L"-shaped plate of the present invention;

[0021] Figure 7 This is a schematic diagram of the three-dimensional structure of the precast concrete pile of the present invention;

[0022] In the figure: 1. End plate; 2. Lifting hole; 3. Fixing screw; 4. Vertical plate; 5. Flat plate; 6. Jacking screw; 7. Adjusting ring; 8. Heightening screw; 9. Upper plate; 10. Summer melting layer; 11. U-shaped pipe; 12. Ground surface; 13. Lifting groove; 14. Precast concrete pile; 15. Cylinder; 16. Channel steel; 17. Backfill soil; 18. Bottom ring; 19. Foundation pit; 20. Concrete pier; 21. Cast-in-place concrete; 22. Heightening screw hole; 23. Internal thread; 24. Locking screw hole; 25. Cavity; 26. Middle hole; 27. Blind hole; 28. Light hole; 29. Jacking screw hole; 30. Pit; 31. Iron plate. Implementation Method

[0023] The following will describe in detail the preferred embodiments of the present invention in conjunction with the accompanying drawings to provide a clearer understanding of the invention's objectives, features, and advantages. It should be understood that the embodiments shown in the accompanying drawings are not intended to limit the scope of the present invention, but are merely intended to illustrate that the technical solution of the present invention is not limited to one embodiment.

[0024] Combined with attachment Figures 1 to 7 The frozen soil construction prefabricated building foundation structure described in the invention has a plurality of channel steels 16 with inward notches arranged around the cylinder 15. The upper ends of the plurality of channel steels 16 are fixedly connected to the lower surface of the end plate 1. A lifting hole 2 is provided in the middle of the end plate 1. The lifting hole 2 is used for installing the lifting rope during lifting, installing the height adjustment screw 8 and installing the building base plate. The end plate 1 is used as the installation place of the building floor, and some screw holes can also be provided on the end plate 1. There is a gap between the upper plate 9 of the cylinder 15 and the lower surface of the end plate 1. U-shaped tubes 11 are respectively provided on the outer surface of the cylinder 15 between the two channel steels 16. Excavation of foundation pit 19, the ground surface 12 around the foundation pit 19 should not be damaged as much as possible. The foundation pit 19 of the required depth should be excavated using equipment on the frozen ground surface 12. The depth of the foundation pit 19 can be set according to geological conditions and can be flexibly set between two meters and fifteen meters. An appropriate amount of cast-in-situ concrete 21 is poured into the bottom of the excavated foundation pit 19. The cast-in-situ concrete 21 should not submerge the concrete pier 20. The concrete pier 20 and the upper concrete prefabricated piles 14 are completely placed in the foundation pit 19. The diameter of the concrete pier 20 is between twenty centimeters and one meter. If the weight of the building is too large, the diameter can be increased. Use a sling to lift After the end plate 1 is lifted, the cavity 25 of the lower cylinder 15 of the end plate 1 is placed on the concrete precast pile 14. A lifting groove 13 is provided near the outer edge of the upper end of the concrete precast pile 14. The height adjustment screw 8 is passed through the height adjustment screw hole 22 of the upper plate 9 at the upper end of the cylinder 15 and pressed against the upper end surface of the concrete precast pile 14 to make the cylinder 15 at a suitable height. An iron plate 31 is provided on the upper end surface of the concrete precast pile 14, and a pit 30 corresponding to the lower end of the height adjustment screw 8 is provided in the middle of the iron plate 31; the soil from the pit is filled into the cylinder 15 and the backfill soil 17 is compacted. The remaining virtual soil can be piled up in the foundation pit 19 and the height does not exceed Through the upper plate 9, so as to increase the thickness of the summer melting layer 10 of the ground surface 12; put the adjusting ring 7 on the upper part of the multiple channel steels 16 and make the lower surface of the adjusting ring 7 stick to the ground surface 12, use the tightening screws 6 on the channel steel 16 to make the lower surface of the adjusting ring 7 tightly connected to the ground surface 12; then adjust the two upper pipe openings of each of the U-shaped tubes 11 to be respectively provided with internal threads 23, and one of the two upper pipe openings of the U-shaped tube 11 is connected to the refrigeration equipment through a pipeline to obtain cold air; or connect the fan through a pipeline to allow natural cold air to be sent in at night, and the other exhaust port can be closed during the day to keep the U-shaped tube 11 warm.

[0025] Combined with attachment Figure 1 、 2Or 4, four channel steels 16 with intervals and notches facing inward are connected to the four sides of the cylinder 15 by welding; the four U-shaped tubes 11 are on the outer wall of the cylinder 15 between the four channel steels 16, and a bottom ring 18 is fixed on the outer wall of the lower end of the cylinder 15. The lower ends of the four channel steels 16 are fixedly connected to the bottom ring 18, and the bending parts of the lower ends of the four U-shaped tubes 11 are close to the upper surface of the bottom ring 18.

[0026] Combined with attachment Figure 1 The middle hole 26 of the adjusting ring 7 is sleeved on the upper part of the outer surface of the multiple channel steels 16, and locking screw holes 24 are respectively provided on the upper part of the outer side surfaces of the multiple channel steels 16. The fixing screws 3 are respectively passed through the light holes 28 of the four "L"-shaped plate vertical plates 4 and connected to the locking screw holes 24 of the channel steel 16; tightening screw holes 29 are provided on the flat plates 5 of the four "L"-shaped plates, and the tightening screws 6 are pressed against the upper surface of the adjusting ring 7 after passing through the tightening screw holes 29. The upper surface of the adjusting ring 7 is provided with a plurality of blind holes 27 corresponding to the lower end of the tightening screws 6, and the lower end of the tightening screws 6 is pressed in the blind hole 27.

[0027] Further, combined with the Figure 1 Or 7 The concrete precast pile 14 and the concrete pier 20 of the present application are an integrated structure, wherein the iron plate 31 arranged on the upper end surface of the concrete precast pile 14 and the steel cage inside the concrete precast pile 14 are welded into one piece before pouring; the cylinder 15 is configured to have a lower opening structure with an upper plate 9, and the material used is a seamless steel pipe. The spacing between the end plates 1 arranged at the upper end of the upper plate 9 of the cylinder 15 can at least ensure the installation of the height adjustment screw 8, and the channel steel 16 on the outer edge of the cylinder 15 should ensure that it is firmly welded, and the upper and lower ends of the channel steel 16 should also be firmly welded to the end plate 1 and the bottom ring 18; the middle hole 26 of the adjusting ring 7 is spaced apart from the outer edge surface of the multiple channel steels 16.

[0028] While the preferred embodiments of the present invention have been described in detail above, it should be understood that, after reading the above teachings of the present invention, those skilled in the art may make various changes or modifications within the scope of the present invention. Such equivalents also fall within the scope defined by the appended claims.

[0029] The parts not described in detail in this invention are prior art.

Claims

1. A prefabricated building foundation structure for frozen soil construction, characterized by: A plurality of channel steels (16) with grooves facing inward are arranged around the cylinder (15), and the upper ends of the plurality of channel steels (16) are fixedly connected to the lower surface of the end plate (1). A gap is left between the upper plate (9) of the cylinder (15) and the lower surface of the end plate (1). U-shaped tubes (11) are respectively arranged on the outer surface of the cylinder (15) between two channel steels (16); a foundation pit (19) of a required depth is excavated on the frozen ground surface (12), and an appropriate amount of cast-in-place concrete (21) is poured into the bottom of the foundation pit (19), and the concrete pier (20) and the upper concrete precast pile (14) are completely placed in the foundation pit (19). After the end plate (1) is lifted by a hoist, the cavity of the cylinder (15) below the end plate (1) is opened. (25) is put on the concrete precast pile (14), and the height adjustment screw (8) is passed through the height adjustment screw hole (22) of the upper plate (9) at the upper end of the cylinder (15) and pressed against the upper end surface of the concrete precast pile (14) so that the cylinder (15) is at a suitable height; the soil of the excavated pit is filled into the cylinder (15) and the backfill soil (17) is compacted; the adjustment ring (7) is put on the upper part of the plurality of channel steels (16) and the lower surface of the adjustment ring (7) is attached to the ground surface (12), and the tightening screw (6) on the channel steel (16) is used to tightly connect the lower surface of the adjustment ring (7) to the ground surface (12); then adjust the two upper pipe ports of each of the U-shaped tubes (11) so that one is connected to the cold air inlet and the other is the exhaust port; Four channel steels (16) spaced apart and with notches facing inward are connected around the cylinder (15) by welding; four U-shaped tubes (11) are located on the outer wall of the cylinder (15) between the four channel steels (16); a bottom ring (18) is fixed on the outer wall of the lower end of the cylinder (15); the lower ends of the four channel steels (16) are fixedly connected to the bottom ring (18); and the bending parts of the lower ends of the four U-shaped tubes (11) are close to the upper surface of the bottom ring (18).

2. The frozen soil prefabricated building foundation structure according to claim 1 is characterized by: The middle hole (26) of the adjusting ring (7) is sleeved on the upper part of the outer surface of the plurality of channel steels (16), and locking screw holes (24) are respectively provided on the upper part of the outer side surface of the plurality of channel steels (16). The fixing screws (3) are respectively passed through the light holes (28) of the four "L"-shaped plate vertical plates (4) and then connected to the locking screw holes (24) of the channel steel (16); and the top tightening screw holes (29) are provided on the flat plates (5) of the four "L"-shaped plates. The top tightening screws (6) pass through the top tightening screw holes (29) and then press against the upper surface of the adjusting ring (7).

3. The frozen soil prefabricated building foundation structure according to claim 2 is characterized by: A plurality of blind holes (27) corresponding to the lower ends of the tightening screws (6) are provided on the upper surface of the adjusting ring (7), and the lower ends of the tightening screws (6) are pressed into the blind holes (27).

4. The frozen soil construction prefabricated building foundation structure according to claim 1 is characterized by: Internal threads (23) are respectively provided at the two upper pipe openings of the U-shaped tube (11). One of the two upper pipe openings of the U-shaped tube (11) is connected to a refrigeration device through a pipeline to obtain cold air; or at night, it is connected to a fan through a pipeline to allow natural cold air to be supplied. The other exhaust port is closed during the day to keep the U-shaped tube (11) warm.

5. The frozen soil prefabricated building foundation structure according to claim 1 is characterized by: A hoisting hole (2) is provided in the middle of the end plate (1), and the hoisting hole (2) is used for installing a hoisting rope during hoisting, installing a height adjustment screw (8), and installing a building base plate.

6. The frozen soil prefabricated building foundation structure according to claim 1 is characterized by: A lifting groove (13) is provided near the outer edge of the upper end of the precast concrete pile (14).

7. The frozen soil prefabricated building foundation structure according to claim 1 is characterized by: An iron plate (31) is provided on the upper end surface of the precast concrete pile (14), and a recess (30) corresponding to the lower end of the height adjustment screw (8) is provided in the middle of the iron plate (31).

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