Pier column hoisting method capable of reducing foundation pit edge hoisting radius

Abstract

The invention discloses a pier column hoisting method capable of reducing the hoisting radius of the edge of a foundation pit. The pier column hoisting method comprises the steps that a bearing platform is constructed at the design position of the bearing platform in the foundation pit; after the bearing platform reaches the design strength, a frame-shaped support is constructed on the periphery of the design installation position of a pier stud at the top of the bearing platform, and the top elevation of the frame-shaped support is flush with the ground elevation; first earthwork backfilling is conducted on the part, outside the frame-shaped support, in the foundation pit; the truck crane is moved to the edge of the foundation pit, and the pier column is hoisted to the designed installation position; and the frame-shaped support is dismantled, secondary earthwork backfilling is conducted in the area, within the primary earthwork backfilling part, in the foundation pit, and the construction safety is improved through the hoisting method.

Description

Technical Field

[0001] The present invention relates to the technical field of construction, and particularly to a column hoisting method that can reduce the hoisting radius at the edge of a foundation pit. Background Art

[0002] The foundation pit of a bearing platform usually has a deep and narrow structure. Hoisting precast columns around it is an inevitable and important link. At the same time, precast columns generally have a large weight and a long size. Therefore, hoisting at the edge of such foundation pits faces many special challenges. One is the large hoisting weight, which causes the edge of the foundation pit to bear a large lateral earth pressure during hoisting. Therefore, it is necessary to additionally strengthen the foundation pit support and the floor of the hoisting position, or the hoisting machinery needs to stand far away from the edge of the foundation pit for operation, resulting in an increase in the hoisting radius, which is particularly limited during construction in narrow urban areas. The other is the large hoisting height. If the hoisting radius is also large, high requirements are imposed on the hoisting performance of the hoisting machinery, and larger-tonnage equipment needs to be selected, which is costly. At the same time, large-radius hoisting is prone to tipping accidents due to insufficient equipment stability.

[0003] In the construction of foundation pit projects, backfilling the soil in the side trench is an important link after the construction of the structure inside the foundation pit. The traditional backfilling method usually adopts integral backfilling, that is, backfilling is carried out uniformly after the installation of precast columns. However, in such methods, the backfilling area is not coordinated and planned with the hoisting operation, and the safety of hoisting is not improved by using soil backfilling. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a column hoisting method that can reduce the hoisting radius at the edge of a foundation pit. By adopting the method of distributed backfilling, the soil backfilling and hoisting are dynamically combined, so that the original edge of the foundation pit shrinks inward and the area decreases, finally achieving a significant reduction in the hoisting radius, while improving the construction efficiency and safety.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is a column hoisting method that can reduce the hoisting radius at the edge of a foundation pit, including the steps of:

[0006] Step 1: Construct a bearing platform at the designed position of the bearing platform in the foundation pit;

[0007] Step 2: After the bearing platform reaches the designed strength, construct a frame-shaped support around the outer periphery of the designed installation position of the column on the top of the bearing platform, so that the top elevation of the frame-shaped support is flush with the ground elevation;

[0008] Step 3: Conduct the first soil backfilling for the part outside the frame-shaped support in the foundation pit;

[0009] Step 4: Move the truck crane to the edge of the foundation pit and hoist the column to the designed installation position;

[0010] Step 5: Remove the frame support and carry out a second earth backfill in the area within the first earth backfill.

[0011] A further improvement of the pier hoisting method of the present invention that can reduce the hoisting radius at the edge of the foundation pit is that, when executing the above step 1, a first embedded part for connecting the frame-type support and a second embedded part for connecting the pier are pre-embedded on the top of the base, and are connected to the first embedded part when installing the frame-type support, and are connected to the second embedded part when installing the pier.

[0012] The present invention can reduce the hoisting radius of the foundation pit edge. The further improvement of the pier hoisting method is that the frame support is composed of four plate trusses, adjacent plate trusses are connected by bolts, the top of each plate truss is connected to a hoisting ring, and the outer side of each plate truss is connected to a panel for retaining soil.

[0013] A further improvement of the pier column hoisting method capable of reducing the hoisting radius at the edge of a foundation pit of the present invention is that a ladder for people to go up and down is connected to the inner side of the frame-type support.

[0014] A further improvement of the pier column hoisting method capable of reducing the hoisting radius at the edge of the foundation pit of the present invention is that when executing the above step 4, the earthwork is backfilled in layers and compacted during the first backfilling.

[0015] A further improvement of the pier column hoisting method capable of reducing the hoisting radius at the edge of a foundation pit of the present invention is that, after executing the above step 6, the steel sheet piles at the periphery of the foundation pit are pulled out, and the pile holes formed by pulling out the steel sheet piles are grouting.

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] By adopting the distributed backfill method, the earth backfilling and hoisting are dynamically combined, so that the edge of the original foundation pit is reduced inward and the area is reduced, ultimately achieving a significant reduction in the hoisting radius while improving construction efficiency and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 The present invention is a schematic diagram of the foundation foundation construction of the pier column hoisting method capable of reducing the hoisting radius at the edge of the foundation pit.

[0020] Figure 2Schematic diagram of the frame support construction for the pier hoisting method that can reduce the hoisting radius at the edge of the foundation pit according to the present invention.

[0021] Figure 3 Schematic diagram of the first earth backfill for the pier hoisting method that can reduce the hoisting radius at the edge of the foundation pit according to the present invention.

[0022] Figure 4 Schematic diagram of the pier hoisting for the pier hoisting method that can reduce the hoisting radius at the edge of the foundation pit according to the present invention.

[0023] Figure 5 Schematic diagram of the second earth backfill for the pier hoisting method that can reduce the hoisting radius at the edge of the foundation pit according to the present invention.

[0024] Figure 6 Schematic diagram of the completion of the construction for the pier hoisting method that can reduce the hoisting radius at the edge of the foundation pit according to the present invention.

[0025] In the figure: 1. Steel sheet pile; 2. Foundation pit; 3. Raft foundation; 4. First embedded part; 5. Second embedded part; 6. Frame support; 7. Hoisting ring; 8. Ladder; 9. First backfill body; 10. Pier; 11. Truck crane; 12. Second backfill body. Specific implementation mode

[0026] The following illustrates the implementation mode of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0027] The following further elaborates in detail on the pier hoisting method that can reduce the hoisting radius at the edge of the foundation pit according to the present invention in combination with the accompanying drawings and specific embodiments.

[0028] Please refer to Figures 1 to 6 As shown, the pier hoisting method that can reduce the hoisting radius at the edge of the foundation pit includes the steps:

[0029] Step 1: Construct the raft foundation 3 at the designed position of the raft foundation 3 in the foundation pit 2.

[0030] Step 2: After the raft foundation 3 reaches the designed strength, construct a frame support 6 on the outer periphery of the designed installation position of the pier 10 on the top of the raft foundation 3, so that the top elevation of the frame support 6 is flush with the ground elevation.

[0031] Specifically, when implementing the above Step 2, after the raft foundation 3 reaches the designed strength, first remove the temporary support in the foundation pit 2. The temporary support includes a steel waling surrounding the inner periphery of the foundation pit 2 and an internal support abutted against the steel waling.

[0032] Removing the temporary support within the foundation pit 2 provides an installation space for the installation of the frame-shaped support 6.

[0033] Step 3: Conduct the first earth backfilling in the part within the foundation pit 2 outside the frame-shaped support 6;

[0034] Specifically, the first earth backfilling forms the first backfill body 9, and the top elevation of the first backfill body 9 is flush with the top elevation of the frame-shaped support 6. Step 4: Move the truck crane 11 to the edge of the foundation pit 2 and hoist the pier column 10 to the designed installation position;

[0035] Step 5: Remove the frame-shaped support 6 and conduct the second earth backfilling in the area within the first earth backfilled part.

[0036] Specifically, the second earth backfilling forms the second backfill body 12, and the top elevation of the second backfill body 12 is flush with the top elevation of the first backfill body 9.

[0037] Adopting the method of distributed backfilling, after the first earth backfilling, the edge of the foundation pit 2 shrinks inward and the area of the foundation pit 2 decreases, enabling the truck crane 11 to move to the edge of the foundation pit 2 for hoisting, significantly reducing the hoisting radius and facilitating the subsequent hoisting of the pier column 10.

[0038] Preferably, when performing the above-mentioned Step 1, a first embedded part 4 for connecting the frame-shaped support 6 and a second embedded part 5 for connecting the pier column 10 are pre-embedded at the top of the bearing platform 3. When installing the frame-shaped support 6, it is connected to the first embedded part 4, and when installing the pier column 10, it is connected to the second embedded part 5.

[0039] Specifically, the first embedded part 4 is an anchor bolt, the second embedded part 5 is a steel dowel bar, and the bottom of the pier column 10 is provided with a socket for inserting the steel dowel bar.

[0040] By providing the first embedded part 4, it is convenient to detachably connect the frame-shaped support 6 to the bearing platform 3, improving the connection stability of the frame-shaped support 6. By providing the second embedded part 5, the connection can be completed only by hoisting the pier column 10 in place, improving the construction efficiency.

[0041] Preferably, the frame-shaped support 6 is composed of four plate trusses connected in a surrounding manner. Adjacent plate trusses are connected by bolts. A lifting ring 7 for hoisting is connected to the top of each plate truss, and a panel for retaining soil is connected to the outside of each plate truss.

[0042] Specifically, each plate truss is connected to the bearing platform 3 through the anchor bolt.

[0043] Specifically, when executing the above step 6, first release the connection between each plate truss and the base 3, then release the connection between adjacent plate trusses, and finally use the car crane 11 to lift the lifting ring 7 on the top of the plate truss, and lift the four plate trusses out in turn.

[0044] By configuring the frame-type support 6 to be four detachably connected plate trusses, when installing the frame-type support 6, it is only necessary to hoist the four plate trusses into place separately and then connect them. When dismantling, the frame-type support 6 can also be decomposed into the four plate trusses, which can then be hoisted and dismantled separately, thereby reducing the weight of a single hoisting. The installation and dismantling can be completed using a truck crane 11, thereby improving construction efficiency.

[0045] Preferably, a ladder 8 is connected to the inner side of the frame support 6 for people to go up and down.

[0046] Specifically, the ladder 8 is connected to the inner side of one of the plate trusses.

[0047] By providing the ladder 8, it is convenient for construction workers to go down to the bearing platform 3 to assist in the installation of the pier column 10, thereby improving the construction efficiency.

[0048] Preferably, when executing the above step 4, when the first earth backfill is performed, the earth is backfilled in layers and compacted.

[0049] By adopting the backfilling method of layered backfilling and compaction, the soil density of the first backfill body 9 is ensured, and the influence of soil disturbance on the subsequent hoisting of the pier 10 is avoided.

[0050] Preferably, after executing the above step 6, the steel sheet piles 1 on the periphery of the foundation pit 2 are pulled out, and the pile holes formed by pulling out the steel sheet piles 1 are grouting-filled.

[0051] By injecting grout into the pile hole of the steel sheet pile 1 , the soil stability is ensured, and the influence of soil disturbance on the stability of the pier 10 is avoided.

[0052] 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 present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. 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 present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0053] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed as above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the technical content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A pier column hoisting method capable of reducing the hoisting radius at the edge of a foundation pit, characterized in that: Includes steps: Step 1: construct the cap at the designed position of the cap in the foundation pit; Step 2: After the cap reaches the designed strength, a frame support is constructed on the periphery of the designed installation position of the pier at the top of the cap, so that the top elevation of the frame support is flush with the ground elevation; Step 3: Performing the first earth backfilling in the part outside the frame support in the foundation pit; Step 4: Move the truck crane to the edge of the foundation pit and hoist the pier to the designed installation position; Step 5: Remove the frame support and carry out a second earth backfill in the area within the first earth backfill.

2. The pier column hoisting method capable of reducing the hoisting radius at the edge of the foundation pit as claimed in claim 1, characterized in that: When executing the above step 1, a first embedded part for connecting the frame-type support and a second embedded part for connecting the pier are embedded on the top of the base. When installing the frame-type support, the first embedded part is connected, and when installing the pier, the second embedded part is connected.

3. The pier column hoisting method capable of reducing the hoisting radius at the edge of the foundation pit as claimed in claim 1, characterized in that: The frame-type support is composed of four plate trusses, and adjacent plate trusses are connected by bolts. The top of each plate truss is connected to a lifting ring for lifting, and the outer side of each plate truss is connected to a panel for retaining soil.

4. The pier column hoisting method capable of reducing the hoisting radius at the edge of the foundation pit as claimed in claim 1, characterized in that: The inner side of the frame-type support is connected with a ladder for people to go up and down.

5. The pier column hoisting method capable of reducing the hoisting radius at the edge of the foundation pit as claimed in claim 1, characterized in that: When executing step 4 above, when backfilling the earth for the first time, backfill in layers and compact it.

6. The pier column hoisting method capable of reducing the hoisting radius at the edge of the foundation pit as claimed in claim 1, characterized in that: After executing the above step 6, the steel sheet piles on the periphery of the foundation pit are pulled out, and the pile holes formed by pulling out the steel sheet piles are grouting.

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