A deep foundation pit retaining steel removal device

Abstract

This utility model relates to the technical field of foundation pit construction devices, and in particular to a deep foundation pit retaining steel removal device, including a supporting base plate. The supporting base plate is a metal component with a rectangular cross-section. The supporting base plate is placed horizontally on the construction ground. A through hole is opened in the center of the supporting base plate, located directly above the steel to be removed. First hydraulic push rods are symmetrically installed on the top of the supporting base plate. Lifting parts are fixedly installed at the piston rod ends of the top of the two first hydraulic push rods. Support frames are symmetrically fixedly installed at the bottom center of the lifting parts. A second hydraulic push rod is installed at the bottom of each lifting part. Clamping blocks are fixedly connected to the piston rod ends of the two second hydraulic push rods through positioning frames. Rectangular holes are opened inside the clamping blocks, and multiple strip blocks are inserted into the rectangular holes. The multiple strip blocks slide against each other. Positioning threaded holes are symmetrically opened inside the positioning frames. This utility model has the characteristic of wide applicability.

Description

Technical Field

[0001] This utility model relates to the technical field of foundation pit construction equipment, and in particular to a deep foundation pit retaining steel removal device. Background Technology

[0002] In the construction industry, deep foundation pit retaining steel removal devices are important equipment used to extract and reuse the steel sections used in the process of deep foundation pit support. With the continuous development of urban construction, deep foundation pit projects are increasing. As a commonly used retaining structure material, steel sections need to be removed after fulfilling their function of supporting the foundation pit to facilitate subsequent construction.

[0003] Currently, in existing deep foundation pit retaining steel removal devices, traditional clamping blocks mostly adopt an integrated structure, such as a single rectangular panel. During steel removal operations, this integrated clamping block tightly fits against the side of the steel, and uses the pulling force applied by external mechanical equipment to pull the steel out of the soil.

[0004] However, this integrated clamping block has some shortcomings in actual construction. First, its versatility is poor, only suitable for removing steel sections of specific specifications and shapes. When faced with steel sections of different shapes such as I-beams and circles, the clamping block shape cannot be flexibly adapted, making it difficult to form an effective clamping force, resulting in the removal operation not proceeding smoothly. Second, in actual operation, due to the complex environment around deep foundation pits and the uneven distribution of soil resistance to the steel sections, the integrated clamping block is difficult to adjust locally according to the resistance experienced by the steel section. During the removal process, relative slippage between the clamping block and the steel section is prone to occur, which not only reduces the removal efficiency but may also damage the steel section and the clamping block, increasing maintenance costs and construction risks.

[0005] Therefore, it is necessary to provide a deep foundation pit retaining steel removal device to solve the above-mentioned technical problems. Utility Model Content

[0006] In view of the problems existing in the prior art, this utility model provides a deep foundation pit retaining steel removal device.

[0007] The technical solution adopted by this utility model to solve its technical problem is: a deep foundation pit retaining steel removal device, including a support base plate, the support base plate is a metal component with a rectangular cross section, the support base plate is placed horizontally on the construction ground, and a through hole is opened in the center of the support base plate, the through hole is located directly above the steel to be removed;

[0008] The top of the support base plate is symmetrically equipped with first hydraulic push rods. Lifting parts are fixedly installed at the piston rod ends of the top of the two first hydraulic push rods. Support frames are symmetrically fixedly installed at the bottom center of the lifting parts. A second hydraulic push rod is installed at the bottom of each lifting part. Clamping blocks are fixedly connected to the piston rod ends of the two second hydraulic push rods through positioning frames.

[0009] Preferably, the clamping block has a rectangular hole inside, and multiple strip blocks are inserted into the rectangular hole. The multiple strip blocks slide with each other. The positioning frame has symmetrical positioning threaded holes inside. The center of the positioning threaded hole at any longitudinal position is aligned with the center line of the strip block. A positioning threaded rod is installed in each positioning threaded hole through threaded engagement.

[0010] Preferably, one end face of the strip block facing away from the positioning frame is provided with protrusions at equal intervals along its path, and the protrusions are components made of rubber.

[0011] Preferably, the protrusion and the strip block are fixedly connected by high-strength bolts.

[0012] Preferably, the width of the plurality of strip blocks gradually decreases from the center to both sides along the horizontal short side of the rectangular hole.

[0013] Preferably, the end face of the strip block facing the positioning threaded hole has a fixing threaded groove, and the fixing threaded groove and the positioning threaded rod are mating components.

[0014] Preferably, the upper end face of the supporting base plate is welded with lifting lugs, and the four lifting lugs are arranged in a rectangular pattern.

[0015] Compared with related technologies, the deep foundation pit retaining steel removal device provided by this utility model has the following beneficial effects:

[0016] This invention provides a deep foundation pit retaining steel removal device. In this invention, each positioning threaded hole is fitted with a positioning threaded rod through threaded engagement. After one end of multiple strip blocks is attached to the outer wall of the steel to be removed, the construction worker rotates the positioning threaded rod so that one end of the positioning threaded rod is tightly attached to the other end of the multiple strip blocks, locking the position of the multiple strip blocks. At this time, controlling the second hydraulic push rod and the first hydraulic push rod to work completes the removal of the steel to be removed. In this way, multiple strip blocks can flexibly adapt to steel of different shapes, forming an effective clamping force in a targeted manner, thus improving the applicability of the removal device.

[0017] This invention provides a device for removing steel sections used in deep foundation pits. When uneven soil resistance occurs around the steel section, multiple adjustable strip blocks can be easily adjusted locally according to the resistance experienced by the steel section. This prevents relative slippage between the clamping blocks and the steel section during removal, ensuring the smooth removal of the entire steel section. For I-shaped steel sections, the wider middle strip block can grip the web, while the gradually narrowing side strip blocks can fit the flanges. For circular steel sections, multiple strip blocks can contact from different angles, better adapting to the contour and increasing the contact area with the circular steel section, achieving multi-point clamping. The increased contact area also better disperses the clamping force, making the force on the circular steel section more balanced in all directions. This avoids deformation of the steel section or damage to the clamping blocks due to excessive localized force, improving the stability of the entire clamping operation and facilitating the successful removal of the steel section. Attached Figure Description

[0018] Figure 1 The overall structure of this utility model is being attempted;

[0019] Figure 2 This is a top view of the supporting base plate of this utility model;

[0020] Figure 3 This is a perspective view of the clamping block of this utility model;

[0021] Figure 4 This utility model Figure 3 A magnified view of a portion of region A in the middle;

[0022] Figure 5 This is a partial structural diagram of the clamping block of this utility model;

[0023] The following are the labels in the diagram: 1. Support base plate, 11. Through hole, 12. Lifting lug, 2. First hydraulic push rod, 3. Lifting part, 4. Support frame, 5. Second hydraulic push rod, 6. Clamping block, 51. Positioning frame, 61. Rectangular hole, 62. Strip block, 63. Positioning threaded hole, 64. Positioning threaded rod, 65. Protrusion, 66. Fixing threaded groove. Detailed Implementation

[0024] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0025] Furthermore, the terms used below are defined based on the functions of this utility model and may vary depending on the user's or operator's intent or convention. Therefore, these terms are defined based on the entire contents of this specification.

[0026] Please see Figures 1-5The present invention discloses a deep foundation pit retaining steel removal device, which includes a support base plate 1. The support base plate 1 is a metal component with a rectangular cross-section. The support base plate 1 is placed horizontally on the construction ground. A through hole 11 is provided in the center of the support base plate 1. The through hole 11 is located directly above the steel to be removed.

[0027] The size of the through hole 11 should be larger than the cross-sectional size of most steel profiles on the market to ensure that the steel profile can pass through the through hole 11 during the removal operation;

[0028] The top of the support base plate 1 is symmetrically equipped with first hydraulic push rods 2. The piston rod ends of the top of the two first hydraulic push rods 2 are fixedly installed with lifting parts 3. The two first hydraulic push rods 2 work synchronously. After the first hydraulic push rods 2 work, they can drive the lifting parts 3 to rise or fall.

[0029] A support frame 4 is symmetrically fixedly installed at the bottom center of the lifting part 3. A second hydraulic push rod 5 is installed at the bottom of each lifting part 3. The piston rod ends of the two second hydraulic push rods 5 are fixedly connected to clamps 6 through positioning frames 51. Before construction, the support base plate 1, the first hydraulic push rod 2, the lifting part 3, the support frame 4, the second hydraulic push rod 5 and the clamps 6 can be assembled into an integral structure. Since the upper end face of the support base plate 1 is welded with lifting lugs 12 and the four lifting lugs 12 are distributed in a rectangular shape, the lifting lugs 12 can be hung by the crane lifting tool to drive the above integral structure to the working position.

[0030] When the clamping blocks 6 are positioned on both sides of the steel section to be pulled out, the second hydraulic push rod 5 is activated to push the clamping blocks 6 tightly against the outer wall of the steel section to be pulled out. Then, the first hydraulic push rod 2 is activated to lift the lifting part 3 and the steel section to be pulled out. After rising to a certain height, the second hydraulic push rod 5 is activated to separate the clamping blocks 6 from the steel section to be pulled out. Then, the first hydraulic push rod 2 is controlled to lift the lifting part 3 back to the initial position. The above stroke is one cycle of operation. By repeating the above cycle of operation, the steel section to be pulled out can be removed.

[0031] In another embodiment, see Figure 3 and Figure 4 The clamping block 6 has a rectangular hole 61 inside, and multiple strip blocks 62 are inserted into the rectangular hole 61. The multiple strip blocks 62 slide against each other. The contact surfaces between the multiple strip blocks 62 can be coated with lubricating oil to reduce the friction when adjacent strip blocks 62 slide against each other. In this way, when the position of the clamping block 6 is adjusted to both sides of the steel to be pulled, one end of the multiple strip blocks 62 is pushed to fit against the outer wall of the steel to be pulled. The steel can be an I-shaped steel, a round steel or other shapes.

[0032] Furthermore, the positioning frame 51 has symmetrically arranged positioning threaded holes 63 inside. The center of the positioning threaded hole 63 at any longitudinal position is aligned with the center line of the strip block 62. Each positioning threaded hole 63 is fitted with a positioning threaded rod 64 through threaded engagement. After one end of the multiple strip blocks 62 is attached to the outer wall of the steel to be pulled, the construction personnel rotate the positioning threaded rod 64 so that one end of the positioning threaded rod 64 is tightly attached to the other end of the multiple strip blocks 62, locking the position of the multiple strip blocks 62. At this time, the second hydraulic push rod 5 and the first hydraulic push rod 2 are controlled to complete the removal of the steel to be pulled. In this way, the multiple strip blocks 62 can flexibly adapt to steel of different shapes, forming an effective clamping force in a targeted manner, and improving the applicability of the removal device.

[0033] Furthermore, when there is uneven soil resistance around the steel section, multiple adjustable strip blocks 62 can be easily adjusted locally according to the resistance of the steel section, making it less likely for the clamps and the steel section to slide relative to each other during the removal process, thus ensuring the entire removal operation of the steel section to be removed.

[0034] Furthermore, such as Figure 3 As shown, one end face of the back positioning frame 51 of the strip block 62 is provided with protrusions 65 at equal intervals along its path, and the protrusions 65 are components made of rubber. When the clamping block 6 moves toward the two sides of the steel to be pulled out, the multiple protrusions 65 directly contact the outer wall of the steel to be pulled out, increasing the friction with the outer wall of the steel to be pulled out. The rubber material can be neoprene rubber or polyurethane rubber.

[0035] The protrusion 65 and the strip block 62 are fixedly connected by high-strength bolts. When several or a certain protrusion 65 are deformed or damaged, the protrusion 65 at the corresponding position can be replaced by removing the high-strength bolts.

[0036] In another embodiment, such as Figures 3-5 The width of the plurality of strip blocks 62 gradually decreases from the center to both sides along the horizontal short side of the rectangular hole 61. This direction can be referred to as... Figure 3 As shown in the N-direction, this gradient method is better adapted to steel profiles of different shapes;

[0037] For I-beams, the wider central strip 62 can grip the web, while the gradually narrowing strips 62 on both sides can fit the flanges. For round steel sections, multiple strips 62 can contact from different angles, better adapting to the profile and increasing the contact area with the round steel section, achieving multi-point clamping. The increased contact area also better disperses the clamping force, making the force on the round steel section more balanced in all directions. This avoids deformation of the steel section or damage to the clamping blocks due to excessive localized force, improving the stability of the entire clamping operation and facilitating the smooth removal of the steel section.

[0038] At the same time, such as Figure 5 As shown, the end face of the strip block 62 facing the positioning threaded hole 63 is provided with a fixing threaded groove 66, and the fixing threaded groove 66 and the positioning threaded rod 64 are mating components. After several strip blocks 62 are positioned, the positioning threaded rods 64 at each corresponding position can be directly screwed into the fixing threaded groove 66 to lock the position of the strip block 62. At this time, the position of the strip block 62 is positioned in all horizontal directions, so that it is not easy to shake or change its position during operation.

[0039] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A deep foundation pit retaining steel removal device, comprising a supporting base plate (1), characterized in that, The supporting base plate (1) is a metal component with a rectangular cross section. The supporting base plate (1) is placed horizontally on the construction ground. A through hole (11) is opened in the center of the supporting base plate (1). The through hole (11) is located directly above the steel section to be pulled out. The top of the support base plate (1) is symmetrically equipped with first hydraulic push rods (2), and the top piston rod ends of the two first hydraulic push rods (2) are fixedly equipped with lifting parts (3). The bottom center of the lifting parts (3) is symmetrically equipped with support frames (4). The bottom of each lifting part (3) is equipped with a second hydraulic push rod (5), and the piston rod ends of the two second hydraulic push rods (5) are fixedly connected with clamps (6) through positioning frames (51).

2. The deep foundation pit retaining steel removal device according to claim 1, characterized in that, The clamping block (6) has a rectangular hole (61) inside, and multiple strip blocks (62) are inserted into the rectangular hole (61). The multiple strip blocks (62) slide and cooperate with each other. The positioning frame (51) has symmetrical positioning threaded holes (63) inside. The center of the positioning threaded hole (63) at any longitudinal position is aligned with the center line of the strip block (62). Each positioning threaded hole (63) has a positioning threaded rod (64) installed in it through threaded cooperation.

3. The deep foundation pit retaining steel removal device according to claim 2, characterized in that, The back positioning frame (51) of the strip block (62) has protrusions (65) evenly spaced along its path on one end face, and the protrusions (65) are components made of rubber.

4. The deep foundation pit retaining steel removal device according to claim 3, characterized in that, The protrusion (65) and the strip block (62) are fixedly connected by high-strength bolts.

5. The deep foundation pit retaining steel removal device according to claim 2, characterized in that, The width of the multiple strip blocks (62) gradually decreases from the center to both sides along the horizontal short side of the rectangular hole (61).

6. The deep foundation pit retaining steel removal device according to claim 2, characterized in that, The strip block (62) has a fixed thread groove (66) on one end face facing the positioning threaded hole (63), and the fixed thread groove (66) and the positioning threaded rod (64) are mating components.

7. The deep foundation pit retaining steel removal device according to claim 1, characterized in that, The upper end face of the supporting base plate (1) is welded with lifting lugs (12), and the four lifting lugs (12) are arranged in a rectangular shape.

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