Dry hole construction sectional type steel casing suitable for strong karst development area

Abstract

The utility model discloses a dry hole construction sectional type steel casing suitable for a karst strong development area, which relates to the field of cast-in-place pile construction and comprises an earth surface operation platform, an anti-seepage air bag, a hoisting assembly and a steel casing assembly. A pile hole is formed in the center of the earth surface operation platform, the lifting assembly is arranged on the periphery of the pile hole, the steel casing assembly is arranged in the pile hole, and the lifting assembly is connected with the steel casing assembly and drives the steel casing assembly to ascend and descend. The steel casing assembly comprises a steel casing body, a spring and a pulley, a lateral groove is formed in the side face of the steel casing body in the height direction, the pulley is movably arranged in the lateral groove, and the hoisting assembly penetrates through a through hole to be connected with the pulley; the top of the steel casing body is sleeved with the anti-seepage air bag. The steel casing body can reach the position of a karst cave, pile forming materials are prevented from leaking into the karst cave to cause supersquareness during cast-in-place pile construction, and it is ensured that the mechanical property of the steel casing body reaches the design strength.

Description

Technical Field

[0001] The utility model relates to the field of cast-in-place pile construction, in particular to a segmented steel casing suitable for dry hole construction in areas with strong karst development. Background Art

[0002] In some areas with strong karst development, mainly calcium carbonate, karst caves are easily formed in the rock mass due to the dissolution and destruction of the rock by surface runoff and groundwater flow. These caves are often accompanied by moderately weathered rock layers underneath, posing a challenge to pile foundation construction in these areas. When constructing cast-in-place piles, if rotary drilling and dry drilling techniques are used, it is necessary to address issues such as the pile-forming material entering the cave during the pouring process, resulting in over-squareness and unsatisfactory pile formation. If the traditional steel casing follow-up method is used, construction costs and time will increase. If the cave is large, the common stone filling method will result in low construction efficiency, and there will still be problems such as leakage of the pile-forming material and uncontrolled pile shape. Utility Model Content

[0003] The technical problem to be solved by the present invention is to address the deficiencies of the above-mentioned existing technologies and to provide a segmented steel casing for dry-hole construction suitable for areas with strong karst development. The casing can be lowered at a specified position and fixed in the cave. The dry-hole construction method is adopted to avoid concrete leakage into the cave during pile foundation pouring, resulting in concrete over-cubicity. Compared with the full-segment follow-up casing, the purpose of saving construction costs and reducing the impact of the cave on the construction progress is achieved.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] The utility model relates to a segmented steel casing for dry hole construction in areas with strong karst development, comprising a surface working platform, an anti-seepage air bag, a lifting assembly and a steel casing assembly; a pile hole is opened in the center of the surface working platform, the lifting assembly is arranged around the pile hole, the steel casing assembly is arranged in the pile hole, the lifting assembly is connected to the steel casing assembly, and drives the steel casing assembly to rise and fall; the steel casing assembly comprises a steel casing body, a spring and a pulley, the side surface of the steel casing body is opened with a lateral groove along the height direction, the pulley is movably arranged in the lateral groove, a through hole is opened in the center of the pulley, the lifting assembly passes through the through hole and is connected to the pulley, the spring is longitudinally arranged in the lateral groove, one end of the spring is connected to the pulley, and the other end is connected to the bottom of the steel casing body; the anti-seepage air bag is sleeved on the top of the steel casing body.

[0006] The utility model has a simple structure and is easy to operate. It allows the steel casing to reach the location of the cave, supporting the hole wall around the drill hole, and preventing the pile material from leaking into the cave during cast-in-place pile construction, causing over-squareness. At the same time, the presence of the casing ensures that the pile body forms a relatively regular shape after casting, ensuring that its mechanical properties reach the designed strength. Compared with the full-section follow-up casing, it achieves the goals of saving construction costs and reducing the impact of the cave on the construction progress.

[0007] As a further preference of the present invention, the lifting assembly includes a crane, a cable and a take-up frame; the cable passes through the through hole of the pulley and is connected to the pulley, one end of the cable is connected to the take-up frame, and the other end of the cable is connected to the crane.

[0008] As a further preference of the present invention, it further includes a one-way limiting component, which is arranged in the lateral groove to prevent the pulley from moving upward, and the pulley is initially arranged above the one-way limiting component.

[0009] As a further preference of the present invention, the one-way limit assembly includes a one-way paddle and a trapezoidal blocking member; the one-way paddle is an arc-shaped structure with an opening facing downward, and can be rotatably arranged in the lateral groove, and the trapezoidal blocking member is arranged below the one-way paddle, and interferes with the one-way paddle to limit it.

[0010] As a further preference of the present invention, it also includes a steel casing foot bracket assembly; the steel casing bracket assembly includes a first rod, a second rod, a first rotating axis and a second rotating axis; one end of the first rod is hinged to the pulley, the first rotating axis is arranged on the first rod, the second rotating axis is arranged at the bottom of the steel casing body, one end of the second rod is hinged to the first rod through the first rotating axis, and the other end of the second rod is hinged to the bottom of the steel casing through the second rotating axis.

[0011] As a further preference of the present invention, it further comprises a double-hole partition plate, which is provided with two through holes. The double-hole partition plate is arranged in the lateral groove, and the spring is retractably arranged along the through hole direction of the double-hole partition plate.

[0012] As a further preference of the present invention, a hook is further included, and the spring is connected to the pulley via the hook, so as to facilitate the connection between the spring and the pulley.

[0013] As a further preferred embodiment of the present invention, the cables and take-up frames are provided in four groups, which are evenly arranged around the pile hole of the surface working platform, so that the cables and take-up frames are evenly stressed.

[0014] As a further preferred embodiment of the present invention, the one-way paddle is an irregular arc-shaped structure, and the thickness of one end of the one-way paddle in contact with the trapezoidal resistance member is greater than the thickness of the other end.

[0015] As a further preference of the present invention, it further includes an inflation tube and a one-way air valve; the inflation tube is connected to the anti-seepage air bag, and the one-way air valve is arranged at the air inlet of the anti-seepage air bag.

[0016] The utility model has the following beneficial effects:

[0017] The utility model has a simple structure and is easy to operate. It allows the steel casing to reach the location of the cave, supporting the hole wall around the drill hole, and preventing the pile material from leaking into the cave during cast-in-place pile construction, causing over-squareness. At the same time, the presence of the casing ensures that the pile body forms a relatively regular shape after casting, ensuring that its mechanical properties reach the designed strength. Compared with the full-section follow-up casing, it achieves the goals of saving construction costs and reducing the impact of the cave on the construction progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a top view of the overall structure of the utility model;

[0019] Figure 2 yes Figure 1 A local enlarged view of point A;

[0020] Figure 3 This is a bottom view of the overall structure of the utility model;

[0021] Figure 4 This is a schematic diagram of the surface working platform and lifting components of the utility model;

[0022] Figure 5 yes Figure 4 A local enlarged view of point A;

[0023] Figure 6 This is a schematic structural diagram of the steel casing assembly of the utility model;

[0024] Figure 7 yes Figure 6 A local enlarged view of point A;

[0025] Figure 8 This is a structural diagram of the steel casing foot bracket assembly of the utility model;

[0026] Figure 9 yes Figure 8 A local enlarged view of point A;

[0027] Figure 10 This is a front view of the one-way paddle of the utility model;

[0028] Figure 11 It is a side view of the one-way paddle and the trapezoidal resistance member of the utility model.

[0029] Among them are: 1. Surface working platform; 2. Anti-seepage airbag; 3. Steel casing assembly; 31. Steel casing body; 32. Spring; 33. Pulley; 34. Lateral groove; 35. Double-hole partition; 36. One-way paddle; 37. Trapezoidal resistance piece; 4. Steel casing foot bracket assembly; 41. First rod; 42. Second rod; 43. First rotating shaft; 44. Second rotating shaft; 5. Lifting assembly; 51. Crane; 52. Cable; 53. Take-up frame. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and specific preferred embodiments.

[0031] In the description of the present invention, it should be understood that the terms "left side," "right side," "upper," "lower," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Terms such as "first" and "second" do not indicate the importance of a component and therefore should not be construed as limiting the present invention. The specific dimensions used in this embodiment are merely for illustrative purposes and do not limit the scope of protection of the present invention.

[0032] like Figure 1-11 As shown, a segmented steel casing suitable for dry hole construction in areas with strong karst development is provided, which includes a surface working platform 1, an anti-seepage air bag 2, a steel casing assembly 3, a steel casing foot support assembly 4 and a lifting assembly 5.

[0033] A pile hole is provided at the center of the surface working platform 1, the lifting assembly 5 is arranged around the pile hole, the steel casing assembly 3 is arranged in the pile hole, the lifting assembly 5 is connected to the steel casing assembly 3, driving the steel casing assembly 3 to rise and fall; the steel casing assembly 3 includes a steel casing body 31, a spring 32 and a pulley 33, the side of the steel casing body 31 is provided with a lateral groove 34 along the height direction, the pulley 33 is movably arranged in the lateral groove 34, a through hole is provided in the center of the pulley 33, the lifting assembly 5 is connected to the pulley 33 through the through hole, the spring 32 is longitudinally arranged in the lateral groove 34, one end of the spring 32 is connected to the pulley 33, and the other end is connected to the bottom of the steel casing body 31; the anti-seepage airbag 2 is sleeved on the top of the steel casing body 31.

[0034] The utility model has a simple structure and is easy to operate. It allows the steel casing to reach the location of the cave, supporting the hole wall around the drill hole, and preventing the pile material from leaking into the cave during cast-in-place pile construction, causing over-squareness. At the same time, the presence of the casing ensures that the pile body forms a relatively regular shape after casting, ensuring that its mechanical properties reach the designed strength. Compared with the full-section follow-up casing, it achieves the goals of saving construction costs and reducing the impact of the cave on the construction progress.

[0035] The lifting assembly 5 includes a crane 51, a cable 52, and a take-up frame 53. The cable 52 used to lift the steel casing body 31 passes through the lower end of the take-up frame 53 at both ends. One end is fixed to one side of the take-up frame 53 and wound around the take-up frame 53. The other end passes through the other side of the take-up frame 53 and is hung on the crane 51.

[0036] The anti-seepage airbag 2 is wrapped around the upper part of the steel casing body 31. When the anti-seepage airbag 2 is not inflated, it is connected to the inflation pipe and lowered together with the steel casing body 31. When the steel casing body 31 is confirmed to be lowered to the designated position, the anti-seepage airbag 2 is inflated to fill the gap before subsequent construction.

[0037] The steel casing assembly 3 includes a steel casing body 31, a spring 32, a pulley 33, a lateral groove 34, a double-hole partition 35, a one-way paddle 36, and a trapezoidal block 37. A double-hole partition 35 is provided in the lateral groove 34, dividing the lateral groove 34 into two parts, an upper part and an lower part. The double-hole partition 35 is provided with two holes so that the two springs 32 can freely pass through the holes to achieve vertical expansion and contraction. One end of the spring 32 is fixedly connected to the bottom of the steel casing body 31, and the other end is connected to the pulley 33 at the upper end of the first rod 41 through a hook. The one-way paddle 36 is an arc-shaped structure with an opening facing downward. It is rotatably arranged in the lateral groove 34. The trapezoidal block 37 is arranged below the one-way paddle 36, and contacts the one-way paddle 36 to limit it.

[0038] The steel casing leg support assembly 4 includes a first rod 41, a second rod 42, a first rotation axis 43, and a second rotation axis 44. The first rod 41 is longer than the second rod 42. The first and second rods 41 and 42 are connected by the first rotation axis 43, and both can rotate about this axis. One end of the first rod 41 is hinged to the pulley 33. The first rotation axis 43 is provided on the first rod 41. The second rotation axis 44 is provided at the bottom of the steel casing body 31. One end of the second rod 42 is hinged to the first rod 41 via the first rotation axis 43, and the other end of the second rod 42 is hinged to the bottom of the steel casing via the second rotation axis 44.

[0039] When using this utility model:

[0040] The surface working platform 1 is symmetrically arranged around the pile hole, and the uninflated anti-seepage air bag 2 is wrapped around the upper part of the steel casing body 31, and the steel casing body 31 is placed in position.

[0041] Before lowering the steel casing body 31, the cable 52 passes through the pulley 33 at the upper end of the first rod 41, limiting the pulley 33 above the one-way paddle 36, and the first rod 41 and the second rod 42 are both retracted and stacked in the lateral groove 34 of the steel casing body 31. The cable 52 passing through the pulley 33 passes through the bottom of the take-up frame 53 at both ends, one end is wrapped around the take-up frame 53, and the take-up frame 53 is locked to prevent this end from moving, and one end is hung on the crane 51. It is necessary to control the four cables 52 to be the same length at this time to ensure that when the crane 51 moves longitudinally, the steel casing body 31 also performs a balanced longitudinal displacement to avoid tilting of the steel casing body 31.

[0042] When lowering the steel casing body 31, the cable 52 drags the pulley 33 at the upper end of the first rod 41, the spring 32 is in an extended state, and the crane 51 drags one end of the cable 52 to gradually lower the steel casing body 31. The gravity of the entire steel casing assembly 3, the first rod 41 and the second rod 42 is transferred to the pulley 33 by the 8 springs 32, and then transferred to the 4 cables 52 by the pulley 33.

[0043] When the steel casing body 31 is lowered to the designated position, the steel casing body 31 is supported by the force at the bottom of the cave, and the support force is balanced with the gravity. The cable 52 no longer needs to bear the gravity of the steel casing assembly 3. At this time, the crane 51 is gradually lowered and the take-up frame 53 gradually retracts the excess cable 52.

[0044] On the other hand, after the cable 52 releases the restriction on the pulley 33 at the upper end of the first rod 41, the pulley 33 will gradually shrink and return to its original length due to the action of its own gravity and the elastic force of the spring 32. At this time, the upper pulley 33 of the first rod will move downward. Since the first rod 41 and the second rod 42 are connected by the first rotation axis 43, when the upper end of the first rod 41 slides down, the second rod 42 will be prompted to move with it. Since the lower end of the second rod 42 is fixed to the steel casing body 31, it can only rotate around the second rotation axis 44 on the steel casing body 31. Therefore, when the upper end of the first rod 41 slides down, the first rod 41 and the second rod 42 will both open outward.

[0045] When the pulley 33 at the upper end of the first rod 41 moves downward to the vicinity of the one-way paddle 36, it will still gradually move downward due to its own gravity and the elastic force of the spring 32 until the thin outer end of the one-way paddle 36 is pushed to rotate clockwise, causing the pulley 33 to move below the one-way paddle 36. Once the pulley 33 has completely passed the one-way paddle 36, the one-way paddle 36 will automatically reset itself to rest on the trapezoidal resistance member 37 due to the gravity of the thick end. At this time, even if it is affected by the deadweight of the steel casing body 31 or the friction during the concrete pouring process, the first rod 41 and the second rod 42 cannot reset themselves again, because when the pulley 33 at the upper end of the first rod 41 moves upward, it cannot push the one-way paddle 36 to rotate counterclockwise, and the thick end of the one-way paddle 36 is restricted by the rotation of the trapezoidal resistance member 37, which will no longer allow the pulley 33 to move from bottom to top.

[0046] After ensuring that the steel casing body 31 lands smoothly inside the cave and the take-up frame 53 recovers the cable 52, considering the anti-seepage problem, the anti-seepage air bag 2 located around the upper part of the casing is inflated. The anti-seepage air bag 2 is provided with a one-way air valve. When air is inflated into the anti-seepage air bag 2, the anti-seepage air bag 2 expands to the surrounding areas until the gap between the steel casing body 31 and the hole wall is filled. At this point, the construction of the segmented steel casing is realized, and the subsequent drilling and grouting process is carried out.

[0047] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all fall within the scope of protection of the present invention.

Claims

1. A segmented steel casing suitable for dry hole construction in areas with strong karst development, characterized by: The invention comprises a surface working platform (1), an anti-seepage air bag (2), a lifting assembly (5) and a steel casing assembly (3); a pile hole is provided at the center of the surface working platform (1); the lifting assembly (5) is arranged around the pile hole; the steel casing assembly (3) is arranged in the pile hole; the lifting assembly (5) is connected to the steel casing assembly (3) to drive the steel casing assembly (3) to rise and fall; The steel casing assembly (3) includes a steel casing body (31), a spring (32) and a pulley (33). The side of the steel casing body (31) is provided with a lateral groove (34) along the height direction. The pulley (33) is movably arranged in the lateral groove (34). A through hole is provided in the center of the pulley (33). The lifting assembly (5) passes through the through hole and is connected to the pulley (33). The spring (32) is longitudinally arranged in the lateral groove (34). One end of the spring (32) is connected to the pulley (33), and the other end is connected to the bottom of the steel casing body (31); the anti-seepage airbag (2) is sleeved on the top of the steel casing body (31).

2. The segmented steel casing for dry hole construction in areas with strong karst development according to claim 1 is characterized by: The lifting assembly (5) includes a lifting machine (51), a cable (52) and a take-up frame (53); the cable (52) passes through the through hole of the pulley (33) and is connected to the pulley (33), one end of the cable (52) is connected to the take-up frame (53), and the other end of the cable (52) is connected to the lifting machine (51).

3. The segmented steel casing for dry hole construction in areas with strong karst development according to claim 1 is characterized by: It also includes a one-way limiting component, which is arranged in the lateral groove (34) to prevent the pulley (33) from moving upwards, and the pulley (33) is initially arranged above the one-way limiting component.

4. The segmented steel casing for dry hole construction in areas with strong karst development according to claim 3 is characterized by: The one-way limiting assembly comprises a one-way paddle (36) and a trapezoidal blocking member (37); the one-way paddle (36) is an arc-shaped structure with an opening facing downward, and is rotatably arranged in the lateral groove (34); the trapezoidal blocking member (37) is arranged below the one-way paddle (36), contacts the one-way paddle (36), and limits it.

5. The segmented steel casing for dry hole construction in areas with strong karst development according to claim 4 is characterized by: The invention also includes a steel casing foot support assembly (4); the steel casing support assembly includes a first rod (41), a second rod (42), a first rotating shaft (43) and a second rotating shaft (44); one end of the first rod (41) is hinged to the pulley (33), the first rotating shaft (43) is arranged on the first rod (41), the second rotating shaft (44) is arranged at the bottom of the steel casing body (31), one end of the second rod (42) is hinged to the first rod (41) through the first rotating shaft (43), and the other end of the second rod (42) is hinged to the bottom of the steel casing through the second rotating shaft (44).

6. The segmented steel casing for dry hole construction in areas with strong karst development according to claim 1 is characterized by: It also includes a double-hole partition (35) with two through holes. The double-hole partition (35) is arranged in the lateral groove (34), and the spring (32) is retractably arranged along the through hole direction of the double-hole partition (35).

7. The segmented steel casing for dry hole construction in areas with strong karst development according to claim 1 is characterized by: It also includes a hook, and the spring (32) is connected to the pulley (33) via the hook.

8. The segmented steel casing for dry hole construction in areas with strong karst development according to claim 2 is characterized by: The cables (52) and take-up frames (53) are in four groups and are evenly arranged around the pile hole of the surface working platform (1).

9. The segmented steel casing for dry hole construction in areas with strong karst development according to claim 4 is characterized by: The one-way paddle (36) is an irregular arc-shaped structure, and the thickness of one end of the one-way paddle (36) in contact with the trapezoidal resistance member (37) is greater than the thickness of the other end.

10. The segmented steel casing for dry hole construction in areas with strong karst development according to claim 1 is characterized by: It also includes an inflation tube and a one-way air valve; the inflation tube is connected to the anti-seepage air bag (2), and the one-way air valve is arranged at the air inlet of the anti-seepage air bag (2).

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