Precast pile pulling-out device

Abstract

The utility model discloses a precast pile pulling-out device which comprises a steel latticed column and a sliding bottom holding device fixedly arranged at the bottom of the steel latticed column. The sliding bottom-holding device comprises a sliding bottom-holding device outer frame and a sliding rod, one side of the sliding bottom-holding device outer frame is wider than the steel latticed column, the sliding rod is arranged on the sliding bottom-holding device outer frame and can obliquely slide relative to the sliding bottom-holding device outer frame, and the sliding rod is arranged on the sliding bottom-holding device outer frame from the top position of the side, wider than the steel latticed column, of the sliding bottom-holding device outer frame. The sliding plate slides towards the bottom of the other opposite side; the steel latticed column is vibrated to sink to isolate the precast pile from surrounding soil until the precast pile is below the pile bottom, then the bottom of the precast pile is held by the sliding rod installed at the lowest end of the steel latticed column in a sliding mode, and then the latticed column is vibrated and lifted to carry the pile body until the pile body reaches the ground.

Description

Technical Field

[0001] This utility model relates to the field of construction technology for removing abandoned pile foundations, and in particular to a precast pile removal device. Background Technology

[0002] Precast piles are prefabricated components manufactured in factories using concrete and steel bars according to design standards. They are the most widely used type of pile foundation and are energy-saving and environmentally friendly.

[0003] To improve land utilization, revitalize the urban landscape, and promote social development, old building renovation has become an important project for improving people's livelihoods. Implementing old building renovation necessitates the removal of the original building's pile foundations. However, existing pile extraction techniques suffer from low efficiency and high costs. Therefore, we propose a novel precast pile extraction device. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a precast pile extraction device that can avoid pile breakage or residue during the extraction process, leaving no hidden dangers, and is fast to construct and low in cost.

[0005] The technical solution of this utility model is as follows:

[0006] A precast pile extraction device includes a steel lattice column and a sliding bottom support device fixedly installed at the bottom of the steel lattice column. The sliding bottom support device includes a sliding bottom support device frame and a sliding rod. One side of the sliding bottom support device frame is wider than the steel lattice column. The sliding rod is installed on the sliding bottom support device frame and can slide obliquely relative to the sliding bottom support device frame, from the top position of the side of the sliding bottom support device frame that is wider than the steel lattice column to the bottom position of the opposite side.

[0007] Furthermore, the steel lattice column includes longitudinal members and transverse members. The four longitudinal members are distributed at the four corner points of a regular quadrilateral. The transverse members connect adjacent longitudinal members in pairs, and multiple transverse members are arranged at intervals along the axial direction of the longitudinal members.

[0008] Furthermore, the outer frame of the sliding bottom support device includes a steel plate and an extended steel plate. The steel plate and the extended steel plate are connected, and the two steel plates are arranged opposite each other, and the two extended steel plates are arranged opposite each other, thereby forming a cuboid structure.

[0009] Furthermore, the extended steel plate is provided with a sliding groove, and the two ends of the sliding rod are fitted into the sliding groove. The sliding groove is inclined, with the top end of the sliding groove located outside the cross-sectional area of ​​the steel lattice column and the bottom end located inside the cross-sectional area of ​​the steel lattice column, preferably at the middle position inside the cross-sectional area of ​​the steel lattice column.

[0010] Furthermore, the top of the outer frame of the sliding bottom device is provided with stiffening ribs and welded to the steel lattice column, and a covering steel plate is provided between the two stiffening ribs; this serves to strengthen the connection.

[0011] Furthermore, the lower part of the outer frame of the sliding bottom device is provided with blades, the lower end of which is sharpened to reduce the resistance when the steel lattice column sinks.

[0012] Furthermore, the longitudinal members are made of angle steel, and the transverse members are made of gusset plates.

[0013] Furthermore, the steel lattice column is lengthened in sections, and the four angle steels at the section of the steel lattice column are welded in a staggered manner. The overlapping parts of the angle steels are reinforced and strengthened on the outside with angle steel of the same specification.

[0014] Compared with existing technologies, this utility model innovatively uses a vibratory steel lattice column to isolate the precast pile from the surrounding soil until it reaches 1m below the pile bottom. Then, a sliding rod installed at the bottom of the steel lattice column supports the bottom of the precast pile, and the lattice column is vibrated and lifted, carrying the pile body to the ground. The sliding rod is then removed, and the extracted precast pile body is gradually released. Finally, the precast pile body is mechanically broken into sections. This device avoids pile breakage or residue during the extraction process, leaving no hidden dangers. It also offers fast construction speed and low cost. Furthermore, the device is simple to manufacture, easy to operate, and highly efficient, providing a basis for its widespread application and development in future projects. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall installation structure of this utility model;

[0016] Figure 2 This is an elevation view of the steel lattice column of this utility model;

[0017] Figure 3 This is an elevation view of the sliding bottom support device of this utility model;

[0018] Figure 4 This is a top view of a steel lattice column according to an embodiment of the present invention;

[0019] Figure 5 This is a front view of a steel lattice column according to an embodiment of the present invention;

[0020] Figure 6 This is a side view of the sliding bottom-holding device according to an embodiment of the present invention;

[0021] Figure 7 This is a front view of the sliding bottom-holding device according to an embodiment of the present invention;

[0022] Figure 8 This is a schematic diagram of the sinking of a precast pile encased in a steel lattice column according to this utility model.

[0023] Figure 9This is a schematic diagram of the sliding bottom support device for steel lattice columns of this utility model, in which the sliding rod supports the bottom of the pile.

[0024] Figure 10 This is a schematic diagram of the sliding rod of the pull-out sliding bottom-holding device of this utility model;

[0025] Figure 11 This is a flowchart illustrating the precast pile removal process of this utility model.

[0026] In the diagram: 1. Pile; 2. Steel lattice column; 201. Angle steel; 202. Draping plate; 3. Sliding rod; 4. Outer frame of sliding bottom support device; 401. Steel plate; 402. Extended steel plate; 403. Sliding groove; 404. Stiffening rib; 405. Knife teeth; 406. Covering steel plate. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings.

[0028] A precast pile extraction device includes a steel lattice column and a sliding bottom support device. This device reduces the contact area between the pile and the surrounding soil, thereby reducing friction. After the extraction device reaches the bottom of the pile, the sliding bottom support device uses a sliding rod to support the pile bottom, and then the extraction device moves the pile upwards, ultimately achieving the effect of pile extraction.

[0029] Example:

[0030] A precast pile extraction device includes a steel lattice column and a sliding bottom support device.

[0031] The longitudinal members of the steel lattice column 2 consist of four angle steels with a specification of L180×16mm, and the transverse members consist of gusset plates with a specification of 550×250×14mm, spaced 700mm apart. All steel lattice columns 2 are made of Q355B grade steel, with a dimensional tolerance of 0 to -10mm and a length tolerance of 0 to +50mm. At the segmentation points of the steel lattice column, the four angle steels should be staggered during welding, with a staggered joint length of not less than 50mm. At the overlapping points of the angle steels, reinforcement with angle steel of the same specification should be used on the outer side, with a reinforcing angle steel length ≥500mm, ensuring weld quality. In this embodiment, recycled column piles from previous projects can be used, employing segmented splicing.

[0032] If the steel lattice column 2 uses a newly manufactured device, the angle steel is processed and spliced ​​according to the standard length of the factory. For example, if the factory angle steel is 12m, then when making the steel lattice column, the two diagonal angle steels are 12m long and are connected to the lower section. The two adjacent diagonal angle steels are staggered by 1m, that is, 11m long, and are connected to the lower section.

[0033] The length of the steel lattice column 2 should be greater than the length of the precast pile; otherwise, it will not fit the bottom of the pile and may break the precast pile.

[0034] The sliding bottom support device is a cuboid with a length of 750mm, a width of 680mm, and a height of 1000mm. The widened side of the chute is 750mm, and the other two sides are 680mm. The widened portion is made of 40mm thick steel plate. The chute is angled, 750mm long, and 100mm wide, using a 90mm diameter sliding rod.

[0035] The sliding bottom support device is located at the bottom of the steel lattice column. One side of the sliding bottom support device is 110mm wider than the steel lattice column so that when the steel lattice column sinks to isolate the precast pile from the surrounding soil, the sliding rod on the sliding bottom support device can slide outside the section of the precast pile to avoid affecting the sinking of the steel lattice column.

[0036] The upper steel lattice column 2 needs to be inserted with a sliding bottom support device about 10cm. Then, in addition to placing the sliding rod to widen the surface, the outer frame of the sliding bottom support device on the other three sides also needs to be welded to the angle steel of the vertical longitudinal member of the steel lattice column.

[0037] Because the sliding bottom device is widened on one side to accommodate the sliding rod, two stiffening ribs are welded to the angle steel above it to ensure the strength of this part. A steel plate is then placed between the two stiffening ribs to reduce the resistance when the lattice column is lifted and to increase the rigidity of the connection between the lattice column steel and the widened part of the steel plate.

[0038] Four blades are evenly arranged below the sliding bottom device, with the lower end sharpened to reduce the resistance when the steel lattice column sinks.

[0039] The process steps are as follows:

[0040] Step 1: After determining the accurate position of pile 1, use a crane to lift the vibratory hammer together with the steel lattice column 2, and put the lower end of the steel lattice column 2 around the precast pile 1 to be removed (at this time, the sliding rod 3 on the sliding bottom device is on one side of the steel lattice column, that is, outside the cross section of the precast pile body). Then start the vibratory hammer and sink the steel lattice column 2 together with the sliding bottom device along the pile 1 until it is 1m below the pile bottom (there are two main considerations for the length exceeding the pile bottom: firstly, to ensure that the lowest point of the sliding bottom device exceeds the pile bottom elevation; secondly, to ensure that the sliding rod on the bottom device can slide to the middle of the device, which is normally set to 0.5 to 1m).

[0041] Step 2: After the steel lattice column 2 and the sliding bottom support device sink to about 1m below the bottom of the pile body 1, slowly lift the steel lattice column 2 and the sliding bottom support device upwards. Due to gravity and the resistance of the surrounding soil, the sliding rod 3 on the sliding device will slide along the track to the lowest end (i.e., the center position of the transverse section of the steel lattice column 2), thereby catching the bottom of the pile body 1 that needs to be removed.

[0042] Step 3: After the sliding rod 3 of the sliding bottom support device catches the bottom of the pile 1 to be removed, start the vibratory hammer to gradually lift it upwards until the steel lattice column 2 and the caught pile 1 are completely pulled out of the ground.

[0043] Step 4: After lifting the steel lattice column 2 and pile 1 to the ground, the sliding rod 3 on the sliding bottom device needs to be pulled out in order to remove the pile 1 inside the steel lattice column 2.

[0044] Step 5: After pulling out the sliding rod 3 on the sliding bottom device, use mechanical equipment to gradually pull out the pile 1 inside the steel lattice column 2, and use mechanical segmented breaking until the pile 1 is completely pulled out and broken.

[0045] The novel process of this invention has been verified in multiple projects and can provide a reliable basis and guarantee for subsequent designers and builders.

[0046] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the technical solutions of this utility model. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of this utility model patent.

Claims

1. A precast pile extraction device, characterized in that, It includes a steel lattice column (2) and a sliding bottom support device fixedly installed at the bottom of the steel lattice column (2); the sliding bottom support device includes a sliding bottom support device outer frame (4) and a sliding rod (3). One side of the sliding bottom support device outer frame (4) is wider than the steel lattice column (2). The sliding rod (3) is installed on the sliding bottom support device outer frame (4) and can slide obliquely relative to the sliding bottom support device outer frame (4), from the top position of the side of the sliding bottom support device outer frame (4) that is wider than the steel lattice column (2) to the bottom of the opposite side.

2. The precast pile extraction device according to claim 1, characterized in that, The steel lattice column (2) includes longitudinal members and transverse members. The four longitudinal members are distributed at the four corner points of a regular quadrilateral. The transverse members connect adjacent longitudinal members in pairs, and multiple transverse members are arranged at intervals along the axial direction of the longitudinal members.

3. The precast pile extraction device according to claim 1, characterized in that, The outer frame (4) of the sliding bottom device includes a steel plate (401) and an extended steel plate (402). The steel plate (401) and the extended steel plate (402) are connected, and the two steel plates (401) are arranged opposite to each other and the two extended steel plates (402) are arranged opposite to each other, thereby forming a cuboid structure.

4. The precast pile extraction device according to claim 3, characterized in that, The extended steel plate (402) is provided with a sliding groove (403), and the two ends of the sliding rod (3) are fitted in the sliding groove (403). The sliding groove (403) is inclined, with the top end of the sliding groove (403) located outside the cross-sectional area of ​​the steel lattice column (2) and the bottom end located inside the cross-sectional area of ​​the steel lattice column (2).

5. A precast pile extraction device according to claim 1, characterized in that, The top of the outer frame (4) of the sliding bottom device is provided with a stiffening rib plate (404) and welded to the steel lattice column (2). A covering steel plate (406) is provided between the two stiffening rib plates (404).

6. The precast pile extraction device according to claim 1, characterized in that, The sliding bottom support device has a blade tooth (405) below the outer frame (4), and the lower end of the blade tooth (405) is sharpened to reduce the resistance when the steel lattice column sinks.

7. A precast pile extraction device according to claim 2, characterized in that, The longitudinal members are made of angle steel (201), and the transverse members are made of gusset plates (202).

8. A precast pile extraction device according to claim 7, characterized in that, The steel lattice column (2) is lengthened in sections, and the four angle steels (201) at the section are welded in a staggered manner. The overlapping parts of the angle steels (201) are reinforced with angle steel of the same specification on the outside.

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