Cover-excavation top-down foundation pit steel pipe stand column fixing device

Abstract

The utility model provides a cover-excavation top-down foundation pit steel pipe stand column fixing device, and belongs to the technical field of foundation pit steel pipe stand column installation. In the prior art, the perpendicularity is difficult to adjust and maintain when a steel pipe stand column is installed, but the device comprises a pile bottom positioning part and a pile opening positioning part. The pile bottom positioning part comprises a first plate which is fixedly connected to the bottom end of the steel pipe stand column, and the first plate coincides with the axis of the steel pipe stand column and is matched with the section of an inner cavity of the steel casing to center the bottom of the steel pipe stand column. The pile opening positioning part comprises a second plate and supporting assemblies, the section of the second plate is larger than the pile hole, a lowering hole is formed in the second plate, the diameter of the lowering hole is larger than that of the steel pipe stand column, the multiple supporting assemblies are circumferentially arranged in the circumferential direction of the lowering hole, and the center position of the top of the steel pipe stand column can be adjusted by controlling the stretching amount of the supporting assemblies. The two positioning parts act together, and the perpendicularity of the steel pipe stand column can be adjusted and kept.

Description

Technical Field

[0001] The utility model belongs to the technical field of foundation pit steel pipe column installation, in particular to a cover-excavation reverse foundation pit steel pipe column fixing device. Background Art

[0002] The installation technology of steel pipe columns in foundation pits is an important technology that has gradually emerged and improved with the development of modern construction projects. With the continuous acceleration of urban construction, the development and utilization of high-rise buildings, large public facilities and underground spaces are becoming more and more common. As the foundation engineering of these construction projects, the importance of foundation pit engineering is self-evident.

[0003] Before formal construction, it is necessary to set up pile foundations as the load-bearing foundation. The process includes: drilling pile holes. In order to prevent pile hole collapse and other reasons, steel casings are also set when drilling pile holes. After the pile holes are drilled, steel pipe columns are placed. The steel pipe columns are concentric with the pile holes and the tops extend beyond the pile holes. Concrete is poured at the bottom of the pile holes to fix the steel pipe columns. A cap beam is installed on the top of the steel pipe columns as the load-bearing foundation of the upper structure.

[0004] During the above process, in order to ensure the stability of the load-bearing foundation, the steel pipe column is required to remain vertical and its axis coincide with the axis of the pile hole when it is hoisted into the pile hole; during the process of pouring concrete and concrete solidification, the steel pipe column must remain fixed to ensure that the axis does not deviate. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a device for fixing steel pipe columns in a covered excavation reverse foundation pit, which is used to solve the problem in the prior art that the verticality of steel pipe columns is difficult to adjust and maintain during installation.

[0006] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a steel pipe column fixing device for a cover-excavation reverse foundation pit, which is used to fix the steel pipe column in the pile hole and the pile hole steel casing, and includes a pile bottom positioning part and a pile mouth positioning part;

[0007] The pile bottom positioning part includes a first plate, the first plate is fixedly connected to the bottom end of the steel pipe column, the first plate coincides with the central axis of the steel pipe column, and the cross section of the first plate matches the inner cavity cross section of the steel casing;

[0008] The pile mouth positioning portion includes a second plate and a support assembly. The cross-section of the second plate is larger than the pile hole. A lowering hole is arranged in the second plate. The diameter of the lowering hole is larger than the diameter of the steel pipe column. At least three support assemblies are circumferentially arranged in the circumference of the lowering hole. The support assembly can be telescopic and the telescopic direction is toward the center of the lowering hole.

[0009] Optionally, the support assembly includes a support block, a support rod and an adjustment portion;

[0010] One side of the support block is in contact with the steel pipe column, and the other side is connected to one end of the support rod, and the other end of the support rod is telescopically connected to the adjustment part.

[0011] Optionally, the adjusting part is a fluid telescopic cylinder or an electric telescopic cylinder.

[0012] Optionally, the support block and the support rod are rotationally matched, the support block and the second plate are slidingly matched, the adjustment part is fixed to the second plate, and the adjustment part is threadedly matched with the support rod.

[0013] Optionally, after the support rod passes through the adjusting portion, a twisting handle is provided at the end thereof.

[0014] Optionally, an elastic pad is provided at the contact portion between the support block and the steel pipe column.

[0015] Optionally, a first vertical plate in a "cross" shape is arranged at the center of the first plate, and the outer end of the first vertical plate is in contact with the steel pipe column.

[0016] Optionally, a cross-shaped reflective sticker is affixed to the top surface of the first vertical plate, and the center of the reflective sticker coincides with the axis of the steel casing.

[0017] Optionally, it also includes a plumb bob, a second vertical plate in the shape of a "cross" is provided on the outer periphery of the plumb bob, a reflective sticker in the shape of a "cross" is also affixed to the top surface of the second vertical plate, the center of the reflective sticker coincides with the center of the plumb bob, and the plumb bob is suspended at the top center of the pile hole.

[0018] Optionally, a third vertical plate is arranged on the outer periphery of the first plate, and the third vertical plate matches the cross-section of the inner cavity of the steel casing.

[0019] As described above, the utility model of a steel pipe column fixing device for a cover-excavation reverse foundation pit has at least the following beneficial effects:

[0020] It can improve the installation accuracy of steel pipe columns, improve the bearing capacity of steel pipe column pile foundations as weighing foundations, and improve the stability of building structures. Specifically, the device includes a pile bottom positioning part and a pile mouth positioning part. The pile bottom positioning part includes a first plate, which is fixedly connected to the bottom end of the steel pipe column. The first plate coincides with the central axis of the steel pipe column and matches the inner cavity cross-section of the steel casing, which plays a role in centering the bottom of the steel pipe column; the pile mouth positioning part includes a second plate and a support assembly. The cross-section of the second plate is larger than the pile hole and a lowering hole is arranged therein. The diameter of the lowering hole is larger than the diameter of the steel pipe column. At least three support assemblies are arranged circumferentially in the direction of the lowering hole. The support assemblies can be extended and retracted. The center position of the top of the steel pipe column can be adjusted by controlling the extension and retraction amount of each support assembly. Through the joint action of the two positioning parts, the verticality of the steel pipe column can be adjusted and maintained. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Shown is a partial cutaway schematic diagram of the utility model as a whole.

[0022] Figure 2 Display for this utility model Figure 1 A partial enlarged schematic diagram in the middle.

[0023] Figure 3 Display for this utility model Figure 1 A partial enlarged schematic diagram of point B in the middle.

[0024] Figure 4 The diagram shows a top view of the present invention.

[0025] Among them: steel casing 1, steel pipe column 2, first plate 3, first vertical plate 31, reflective sticker 311, third vertical plate 32, second plate 4, lowering hole 41, support assembly 5, support block 51, support rod 52, twist handle 521, adjustment part 53, plumb bob 6, second vertical plate 61. DETAILED DESCRIPTION

[0026] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0027] See also Figures 1 to 4. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the utility model without substantially changing the technical content.

[0028] The following embodiments are only for illustration purposes and can be combined with each other, and are not limited to the contents presented in the following single embodiments.

[0029] For this example, please refer to Figure 1-3 The utility model provides an embodiment of a steel pipe column fixing device for a cover-excavation reverse foundation pit, which is used to fix a steel pipe column 2 in a pile hole and a pile hole steel casing 1, and includes a pile bottom positioning part and a pile mouth positioning part;

[0030] The pile bottom positioning part includes a first plate 3, which is fixedly connected to the bottom end of the steel pipe column 2, the first plate 3 coincides with the central axis of the steel pipe column 2, and the cross section of the first plate 3 matches the inner cavity cross section of the steel casing 1;

[0031] The pile mouth positioning part includes a second plate 4 and a support assembly 5. The cross-section of the second plate 4 is larger than the pile hole. A lowering hole 41 is arranged in the second plate 4. The diameter of the lowering hole 41 is larger than the diameter of the steel pipe column 2. At least three support assemblies 5 are circumferentially arranged in the circumference of the lowering hole 41. The support assembly 5 can be extended and retracted, and the extension direction is toward the center of the lowering hole 41, that is, toward the steel pipe column in the lowering hole 41.

[0032] In the above embodiment, the working process is as follows: ① first drill a pile hole underground. In order to prevent collapse during the drilling process, a steel casing 1 can be set around the pile hole; ② after the drilling depth reaches the standard, the steel pipe column 2 is hoisted in, and the bottom of the steel pipe column 2 is fixedly connected with the first plate 3, and the steel pipe column 2 is concentric with the first plate 3, and the first plate 3 matches the cavity cross-section of the steel casing 1. When the steel pipe column 2 is hoisted into the pile hole, the bottom of the steel pipe column 2 is also located at the center of the pile hole; ③ the pile mouth positioning part is installed at the pile mouth. To ensure easy assembly, the second plate 4 can be divided into The ground around the pile mouth should be hardened to install the second plate 4. A plumb bob can be put into the steel pipe column 2 or a special instrument can be used to measure the verticality of the steel pipe column 2. Then, the expansion and contraction amount of each support assembly 5 can be adjusted accordingly according to the verticality data to lift the top side wall of the steel pipe column 2; ④ After the verticality meets the standard, the expansion and contraction amount of the support assembly 5 is kept fixed, and then concrete is poured between the pile hole steel casing 1 and the steel pipe column 2 to form a pile body. After the state of the concrete is stable, the pile mouth positioning part can be removed.

[0033] The above embodiment has at least two beneficial effects: first, the verticality of the steel pipe column 2 can be adjusted and the steel pipe column 2 can be fixed, so that the verticality of the steel pipe column 2 will not change during the construction process; second, the first plate 3 of the pile bottom positioning part can isolate the bottom of the pile hole, thereby preventing water gushing, sand gushing, etc. from occurring at the junction of the steel casing and the pile body.

[0034] In this embodiment, the support assembly 5 includes a support block 51, a support rod 52 and an adjustment portion 53; one side of the support block 51 contacts the steel pipe column 2, and the other side is connected to one end of the support rod 52, and the other end of the support rod 52 is telescopically connected to the adjustment portion 53. The extension or retraction of the support rod 52 is adjusted by the adjustment portion 53, so that the support block 51 lifts the steel pipe column 2 to move toward or away from the axis of the pile hole, thereby adjusting the verticality of the steel pipe column 2. In order to reduce the force required by the adjustment portion 53 during adjustment, the steel pipe column 2 can be adjusted in a hoisted state after being hoisted into the pile hole.

[0035] Furthermore, the adjustment part 53 is a fluid telescopic cylinder or an electric telescopic cylinder, such as a pneumatic cylinder, a hydraulic cylinder or an electric cylinder, which can be selected according to the conditions on site. The fluid telescopic cylinder or the electric telescopic cylinder is used as the telescopic power source, which has the advantages of convenient control and large supporting force. The control system can automatically calculate the required telescopic amount of each adjustment part 53 according to the measured inclination of the steel pipe column 2, thereby realizing rapid adjustment. Not only does it simplify the adjustment process, but it also has the characteristics of saving manpower and eliminating manual operation.

[0036] In this embodiment, the support block 51 and the support rod 52 are in rotational cooperation, the support block 51 and the second plate 4 are in sliding cooperation, the adjustment portion 53 is fixed to the second plate 4, and the adjustment portion 53 and the support rod 52 are in threaded cooperation. By twisting the support rod 52, the support rod 52 will move relative to the adjustment portion 53, so as to control the telescopic state of the support block 51 by controlling the twisting direction of the support rod 52. The implementation method in this embodiment is simple and can be implemented without a pneumatic source, a hydraulic source or even a power source. In specific implementation, for the convenience of operation, after the support rod 52 passes through the adjustment portion 53, a twisting handle 521 is provided at the end to facilitate the operation of the operator.

[0037] In this embodiment, an elastic pad is provided at the contact portion between the support block 51 and the steel pipe column 2, and a rubber material may be used to increase the friction between them and avoid direct rigid contact between the surfaces of the support block 51 and the steel pipe column 2, which causes mutual wear.

[0038] This embodiment can be found in Figure 3 , a first vertical plate 31 in the shape of a "cross" is arranged at the center of the first plate 3, and the outer end of the first vertical plate 31 is in contact with the steel pipe column 2. The center of the "cross" of the first vertical plate 31 coincides with the center of the first vertical plate 31. When the steel pipe column 2 and the first vertical plate 31 are fixed, the two can be easily aligned to ensure the installation accuracy of the steel pipe column 2 and the first plate 3. At the same time, the outer end of the first vertical plate 31 is in contact with the steel pipe column 2, which supports the steel pipe column 2, enhances the local strength of the connection, and prevents deformation. In the process of installing and lowering the steel pipe column 2, since the first plate 3 matches the cross-section of the steel casing cavity, the first plate 3 can only be lowered in parallel and cannot be tilted. The steel pipe column 2 is relatively long. Once the top of the steel pipe column 2 is offset, the connection between the steel pipe column 2 and the first plate 3 will be subjected to a large pulling force. The provision of the first vertical plate 31 can enhance the bearing capacity and prevent the components from being deformed by force.

[0039] Further, this embodiment can be referred to Figure 3-4 , Figure 4 It is a top view, the top surface of the first vertical plate 31 is affixed with a "cross" shaped reflective sticker 311, and the center of the reflective sticker 311 coincides with the axis of the steel casing 1. It also includes a plumb bob 6, the outer periphery of the plumb bob 6 is provided with a "cross" shaped second vertical plate 61, the top surface of the second vertical plate 61 is also affixed with a "cross" shaped reflective sticker 311, the center of the reflective sticker 311 coincides with the center of the plumb bob 6, and the plumb bob 6 is suspended at the top center of the pile hole.

[0040] In the above embodiment, once the steel pipe column 2 is hoisted into the pile hole, its bottom will be relatively dark, and only the light at the pile mouth can penetrate into the bottom. The light shines on the "cross" shaped reflective sticker 311 on the top of the first vertical plate 31 and the second vertical plate 61, forming two luminous crosses. When the center points of the two crosses coincide, it means that the steel pipe column 2 is vertical. The above method can be used in scenes with limited conditions. For scenes with higher precision requirements, on the basis of the verticality adjustment in the above method, more accurate verticality measurement and adjustment can also be performed using equipment such as a total station.

[0041] For this example, please refer to Figure 3 The third vertical plate 32 is arranged on the outer periphery of the first plate 3, and the third vertical plate 32 matches the inner cross section of the steel casing 1. The third vertical plate 32 has a certain height. On the one hand, during the lowering process, it slides with the steel casing 1, so that the first plate 3 moves downward more smoothly. At the same time, the third vertical plate 32 increases the contact surface between the first plate 3 and the steel casing 1, which has a better effect of preventing sand and water from gushing out from the bottom of the pile hole.

[0042] In summary, the utility model effectively overcomes various shortcomings in the prior art, can produce beneficial technical effects, and has significant progress.

[0043] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A device for fixing a steel pipe column (2) in a top-down foundation pit, used for fixing a steel pipe column (2) in a pile hole and a pile hole steel casing (1), characterized in that: It includes a pile bottom positioning part and a pile mouth positioning part; The pile bottom positioning portion comprises a first plate (3), the first plate (3) being fixedly connected to the bottom end of the steel pipe column (2), the first plate (3) coinciding with the central axis of the steel pipe column (2), and the cross section of the first plate (3) matching the cross section of the inner cavity of the steel casing (1); The pile opening positioning portion comprises a second plate (4) and a support assembly (5); the second plate (4) has a cross section larger than the pile hole; a lowering hole (41) is provided in the second plate (4); the diameter of the lowering hole (41) is larger than the diameter of the steel pipe column (2); at least three support assemblies (5) are circumferentially arranged in the circumference of the lowering hole (41); the support assemblies (5) are capable of extension and contraction, and the extension and contraction directions are all toward the center of the lowering hole (41).

2. A fixing device for steel pipe columns (2) for a cover-excavation reverse foundation pit according to claim 1, characterized in that: The support assembly (5) comprises a support block (51), a support rod (52) and an adjustment portion (53); One side of the support block (51) is in contact with the steel pipe column (2), and the other side is connected to one end of the support rod (52); the other end of the support rod (52) is telescopically connected to the adjustment portion (53).

3. A fixing device for steel pipe columns (2) for a cover-excavation top-down foundation pit according to claim 2, characterized in that: The adjusting part (53) is a fluid telescopic cylinder or an electric telescopic cylinder.

4. A fixing device for steel pipe columns (2) for a cover-excavation top-down foundation pit according to claim 2, characterized in that: The support block (51) and the support rod (52) are rotationally matched, the support block (51) and the second plate (4) are slidingly matched, the adjustment portion (53) is fixed to the second plate (4), and the adjustment portion (53) and the support rod (52) are threadedly matched.

5. A fixing device for steel pipe columns (2) for a cover-excavation top-down foundation pit according to claim 4, characterized in that: After the support rod (52) passes through the adjustment portion (53), a twisting handle (521) is provided at the end thereof.

6. A fixing device for steel pipe columns (2) for a cover-excavation top-down foundation pit according to claim 2, characterized in that: An elastic pad is provided at the contact portion between the support block (51) and the steel pipe column (2).

7. A fixing device for steel pipe columns (2) for a cover-excavation top-down foundation pit according to claim 1, characterized in that: A first vertical plate (31) in the shape of a cross is arranged at the centre of the first plate member (3), and an outer end portion of the first vertical plate (31) is in contact with the steel pipe column (2).

8. A fixing device for steel pipe columns (2) for a cover-excavation top-down foundation pit according to claim 7, characterized in that: A "cross"-shaped reflective sticker (311) is affixed to the top surface of the first vertical plate (31), and the center of the reflective sticker (311) coincides with the axis of the steel casing (1).

9. A fixing device for steel pipe columns (2) for a cover-excavation top-down foundation pit according to claim 8, characterized in that: The utility model also comprises a plumb bob (6), wherein a second vertical plate (61) in the shape of a cross is provided on the outer periphery of the plumb bob (6), and a reflective sticker (311) in the shape of a cross is also attached to the top surface of the second vertical plate (61), wherein the center of the reflective sticker (311) coincides with the center of the plumb bob (6), and the plumb bob (6) is suspended at the center of the top of the pile hole.

10. A fixing device for steel pipe columns (2) for a cover-excavation top-down foundation pit according to claim 1, characterized in that: A third vertical plate (32) is provided on the outer periphery of the first plate member (3), and the third vertical plate (32) matches the inner cavity cross-section of the steel casing (1).

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