A device for safe demolition of foundation pit steel support

Abstract

This utility model discloses a device for the safe dismantling of steel supports in foundation pits, belonging to the field of foundation pit engineering technology. The utility model includes stop devices installed on both sides of the web of the steel support; each stop device includes a first stop block and a second stop block, with a jack positioned between the first and second stop blocks. The two ends of the jack are supported by a first and a second arc-shaped protrusion, respectively; a guide rod is also provided between the first and second stop blocks. By installing stop devices on both sides of the web of the steel support, and applying pre-pressure to the steel support using jacks in stages before cutting and maintaining stable pressure, this utility model prevents the steel support from bouncing due to the release of internal stress during cutting, improving stability and safety during the cutting process, effectively avoiding safety hazards. The stop devices, guide rods, and jacks are all reusable, reducing operating costs and achieving a zero accident rate.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit engineering technology, and more specifically, to a device for the safe dismantling of steel supports for foundation pits. Background Technology

[0002] To ensure the safety of foundation pit construction, numerous steel support components are required within the pit. These components are typically made of structural steel, with horizontal supports serving as the primary load-bearing parts. Normally, they are removed by releasing internal stress using jacks. However, under extreme conditions such as seasonal temperature changes or variations in the surrounding environment, the axial force on the steel supports may exceed the design value, making it impossible to release the internal stress normally using jacks during removal. In such cases, localized cutting of the steel supports is necessary to release the internal stress. However, this cutting process may cause the steel supports to bounce, creating a safety hazard. To ensure construction safety, a safe removal device for steel supports is needed. Utility Model Content

[0003] 1. Technical problem to be solved by the utility model

[0004] To address the shortcomings and deficiencies of existing technologies, this invention provides a device for the safe dismantling of steel supports in foundation pits. This invention involves installing stop devices on both sides of the web of the steel support. Before cutting, a pre-pressure of 110% of the axial force design value is applied to the steel support using jacks in stages and maintained at that pressure. During cutting, a segmented symmetrical cutting process is employed. Under the action of the stop devices, a temporary constraint system is formed, effectively suppressing the springing of the steel support caused by the release of prestress. During the cutting process, the steel support will not spring open due to the release of internal stress. After partial cutting of the steel support, the two ends at the tangent point temporarily form a whole under the constraint of the stop devices, effectively preventing detachment. The use of this device significantly improves the stability and safety of cutting steel supports, effectively avoiding safety hazards. The stop devices, guide rods, and jacks are all reusable, reducing operating costs and achieving a zero accident rate.

[0005] 2. Technical Solution

[0006] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0007] This utility model provides a device for the safe dismantling of steel supports in foundation pits, including a stop device, which is installed on both sides of the web of the steel support.

[0008] The stop device includes a first stop block and a second stop block, which are spaced apart. Bolt connection holes are provided at the upper and lower ends of the first stop block and the second stop block, and fixing bolts are installed in the bolt connection holes.

[0009] The first stop block has a first arc protrusion on the outer surface of the side adjacent to the second stop block, and the second stop block has a second arc protrusion on the outer surface of the side adjacent to the first stop block.

[0010] A jack is provided between the first stop and the second stop, and the two ends of the jack are supported by a first arc protrusion and a second arc protrusion, respectively.

[0011] A guide rod is also provided between the first stop and the second stop, with both ends of the guide rod passing through the first stop and the second stop respectively and assembled by adjusting bolts.

[0012] Furthermore, the upper and lower ends of the first and second blocks are respectively fixed to the upper and lower flanges of the steel support by fixing bolts.

[0013] Furthermore, the inner walls of both the first and second blocks are provided with reinforcing ribs, which are arranged horizontally.

[0014] Furthermore, the guide rods are arranged in multiple sets at horizontal intervals.

[0015] 3. Beneficial effects

[0016] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0017] This utility model sets stop devices on both sides of the web of the steel support. Before cutting, the steel support is pre-loaded with 110% of the axial force design value by jacking in stages and the pressure is kept stable. During cutting, a segmented symmetrical cutting process is adopted. Under the action of the stop devices, a temporary constraint system is formed, which effectively suppresses the steel support from springing open due to the release of prestress.

[0018] During the cutting process of the steel support, the steel support will not spring apart due to the release of internal stress. After the partial cutting of the steel support is completed, the two ends of the tangent line temporarily form a whole under the constraint of the stop device, which effectively prevents it from falling off. The use of this device significantly improves the stability and safety of the steel support cutting process and effectively avoids safety hazards. The stop device, guide rod and jack can all be reused, reducing the cost of use and achieving a zero accident rate. Attached Figure Description

[0019] Figure 1 This is an overall structural diagram of the present invention;

[0020] Figure 2 This is a structural diagram of the stop device of this utility model;

[0021] Figure 3 This is the front view of the present invention;

[0022] Figure 4 This is a side view of the present invention;

[0023] Figure 5 This is a diagram illustrating the marking effect of the steel support of this utility model.

[0024] Figure 6 This is a diagram showing the effect of cutting the steel support of this utility model.

[0025] In the diagram: 1. Stop device; 11. First stop block; 12. Second stop block; 13. Bolt connection hole; 14. Fixing bolt; 15. First arc protrusion; 16. Second arc protrusion; 17. Reinforcing rib; 2. Jack; 3. Guide rod; 31. Adjusting bolt; 4. Steel support. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0027] Example 1

[0028] from Figure 1-4 As can be seen, a device for the safe removal of steel supports in a foundation pit according to this embodiment includes a stop device 1, which is installed on both sides of the web of the steel support 4.

[0029] The stop device 1 includes a first stop block 11 and a second stop block 12, which are spaced apart. Bolt connection holes 13 are provided at the upper and lower ends of the first stop block 11 and the second stop block 12, and fixing bolts 14 are installed in the bolt connection holes 13. The upper and lower ends of the first stop block 11 and the second stop block 12 are respectively fixed to the upper and lower flanges of the steel support 4 by fixing bolts 14.

[0030] The outer surface of the first stop 11 adjacent to the second stop 12 is provided with a first arc protrusion 15, and the outer surface of the second stop 12 adjacent to the first stop 11 is provided with a second arc protrusion 16.

[0031] A jack 2 is provided between the first stop 11 and the second stop 12. The two ends of the jack 2 are supported by a first arc protrusion 15 and a second arc protrusion 16, respectively. The inner walls of the first stop 11 and the second stop 12 are provided with reinforcing ribs 17, which are horizontally arranged. The reinforcing ribs 17 are used to strengthen the overall strength of the first stop 11 and the second stop 12 and prevent them from deforming under stress.

[0032] A guide rod 3 is also provided between the first stop 11 and the second stop 12. The two ends of the guide rod 3 pass through the first stop 11 and the second stop 12 respectively and are assembled by adjusting bolts 31. Multiple sets of guide rods 3 are arranged horizontally at intervals. The guide rods 3 are used to constrain the direction of force transmission of the jack 2. The jack 2 can only generate force parallel to the length direction of the steel support 4.

[0033] Example 2

[0034] from Figure 5-6 As can be seen, the method for safely dismantling steel supports in a foundation pit according to this embodiment includes the following steps:

[0035] Step 1: Mark lines A, B, and C at the cut points on the upper and lower flanges of the steel support 4, where C is the midline between A and B. Take two sets of stop devices 1 and install them on both sides of the web of the steel support 4.

[0036] Step 2: Adjust the spacing between the first stop block 11 and the second stop block 12 in each set of stop devices 1 in sequence, so that the center line of the stop device 1 coincides with the marking line C. Place the jack 2 between the first stop block 11 and the second stop block 12, and make the two ends of the jack 2 contact the first stop block 11 and the second stop block 12 respectively.

[0037] Step 3: Adjust the installation position of jack 2 so that jack 2 and steel support 4 are parallel to each other, and jack 2 is supported by the first arc protrusion 15 and the second arc protrusion 16 at both ends respectively.

[0038] Step 4: Install guide rod 3, pass both ends of guide rod 3 through the first stop block 11 and the second stop block 12 respectively, and install adjusting bolt 31;

[0039] Step 5: Fix the upper and lower ends of the first stop block 11 and the second stop block 12 to the upper and lower flanges of the steel support 4 respectively using fixing bolts 14;

[0040] Step 6: Start jack 2. Apply jacking force to the first stop 11 and the second stop 12 at both ends of jack 2. Under the support of the jacking force, manually cut the marked lines A and B in sequence. During the cutting process, the steel support 4 is limited and locked by the action of the first stop 11 and the second stop 12 and does not produce relative displacement.

[0041] Step 7: After the steel support 4 is cut at the marked lines A and B, the pressure of the jack 2 is slowly released. During the pressure release process, as the steel support 4 in section AB is cut off, the supporting force of the jack 2 gradually decreases. The first stop 11 and the second stop 12 move closer to each other under the action of force, so that the gap between the first stop 11 and the second stop 12 gradually becomes smaller.

[0042] Step 8: After the jack 2 is completely depressurized, the installation positions of the adjusting bolt 31 and the guide rod 3 can be adjusted to lock the first stop block 11 and the second stop block 12 again. After the steel support 4 is cut off, its two ends are connected into a whole under the action of the stop device 1.

[0043] Step 9: Sequentially remove adjusting bolt 31, guide rod 3, remove jack 2, then remove fixing bolt 14 and remove first stop block 11 and second stop block 12. Stop device 1, guide rod 3, and jack 2 can all be reused. At this time, the two ends of the cut steel support 4 can be removed respectively.

[0044] This invention features a stop device 1 on both sides of the web of the steel support 4. Before cutting the steel support 4, the jack 2 is used to support it. Under the action of the stop device 1, the steel support 4 will not deviate, tilt, or spring apart due to the influence of the internal support force of the support system during the cutting process. After the partial cutting of the steel support 4 is completed, the two ends of its tangent line temporarily form a whole under the constraint of the stop device 1, effectively preventing it from falling off. The use of this device significantly improves the stability and safety of the cutting process of the steel support 4 and effectively avoids safety hazards. The stop device 1, guide rod 3, and jack 2 can all be reused, reducing the cost of use.

[0045] This utility model sets a stop device 1 on both sides of the web of the steel support 4. Before cutting, the steel support 4 is subjected to a pre-pressure of 110% of the axial force design value by jack 2 in stages and the pressure is kept stable. During cutting, a segmented symmetrical cutting process is adopted. Under the action of the stop device 1, a temporary constraint system is formed, which effectively suppresses the steel support 4 from springing open due to the release of prestress.

[0046] During the cutting process of steel support 4, the steel support 4 will not spring open due to the release of internal stress during the cutting process. After the partial cutting of steel support 4 is completed, the two ends of its tangent line temporarily form a whole under the constraint of the stop device, effectively preventing it from falling off. The use of this device significantly improves the stability and safety of the cutting process of steel support, effectively avoiding safety hazards. The stop device, guide rod and jack can all be reused, reducing the cost of use and achieving a zero accident rate.

[0047] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A device for the safe removal of steel supports in a foundation pit, comprising a stop device (1), characterized in that: The stop device (1) is installed on both sides of the web of the steel support (4); The stop device (1) includes a first stop (11) and a second stop (12). The first stop (11) and the second stop (12) are spaced apart. Bolt connection holes (13) are spaced apart at both the upper and lower ends of the first stop (11) and the second stop (12). Fixing bolts (14) are installed in the bolt connection holes (13). The first stop (11) has a first arc protrusion (15) on the outer surface of the side adjacent to the second stop (12), and the second stop (12) has a second arc protrusion (16) on the outer surface of the side adjacent to the first stop (11). A jack (2) is provided between the first stop (11) and the second stop (12), and the two ends of the jack (2) are supported by the first arc protrusion (15) and the second arc protrusion (16) respectively. A guide rod (3) is also provided between the first stop (11) and the second stop (12). The two ends of the guide rod (3) pass through the first stop (11) and the second stop (12) respectively and are assembled by adjusting bolts (31).

2. The device for safe dismantling of steel supports in foundation pits according to claim 1, characterized in that: The upper and lower ends of the first stop (11) and the second stop (12) are respectively fixed to the upper and lower flanges of the steel support (4) by fixing bolts (14).

3. The device for safe dismantling of steel supports in foundation pits according to claim 1, characterized in that: The inner walls of the first block (11) and the second block (12) are provided with reinforcing ribs (17), which are arranged horizontally.

4. The device for safe dismantling of steel supports in foundation pits according to claim 1, characterized in that: The guide rod (3) is arranged in multiple sets at horizontal intervals.

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