Suspension cable type dismantling device for internal support of foundation pit

Abstract

The utility model discloses a suspension cable type dismantling device for supporting inside a foundation pit, which at least comprises a dismantling hoisting group, each dismantling hoisting group comprises two support frames and a stay cable, the two support frames are respectively arranged on the edges of the two opposite sides of the foundation pit, the two ends of the stay cable are respectively fixed on the support frames, and the stay cable is fixed on the support frames. The transfer part is mounted on the inhaul cable in a sliding manner; the transfer part comprises a lifting device and a hanging part installed on the lifting device, the lifting device is installed on the inhaul cable in a sliding mode, the hanging part is used for hanging the disassembled supporting and disassembling section, and the lifting device is used for lifting the supporting and disassembling section upwards; and the traction rope is fixed to the transfer part and connected to a traction device fixed to the ground, and the support dismounting section is moved to the exterior of the foundation pit through the traction device. By means of the inhaul cable, the cut support dismantling section can be moved to the exterior of the foundation pit at a time, transferring in the foundation pit is not needed, the dismantling efficiency and construction safety are improved, and the construction cost is reduced.

Description

Technical Field

[0001] This utility model relates to a suspension-type dismantling device for internal support of foundation pits. Background Technology

[0002] In underground structure construction, to ensure construction safety, supports are typically erected within the foundation pit. These supports are primarily made of reinforced concrete. Depending on the construction method, the supports within the foundation pit are dismantled sequentially according to the construction progress of the underground structure. Currently, the dismantling of reinforced concrete supports mainly includes mechanical dismantling, blasting dismantling, and segmented cutting dismantling. Among these, mechanical dismantling uses heavy machinery such as excavators and hydraulic breakers. Its advantages include fast dismantling speed and the ability to handle large and complex support structures; however, its disadvantages include high noise and vibration levels, significant impact on the surrounding environment, and high skill requirements for operators, with improper operation easily leading to safety accidents.

[0003] Demolition by blasting involves removing supports using explosives. Its advantages include high demolition efficiency, suitability for emergency or large-scale demolition, strong controllability, and precise demolition after strict calculation of blasting parameters. Its disadvantages include generating blasting vibrations and flying rocks, producing a lot of noise, having a significant impact on the environment, requiring strict safety measures, needing a professional blasting team, and incurring high costs.

[0004] The segmented cutting and demolition method is suitable for the demolition of large or complex support structures. During operation, the support is divided into easily manageable small segments, and concrete cutting equipment, such as drilling or wire sawing, is used. Before the support is demolished, temporary scaffolding must be erected. The demolished support beams are placed directly on the scaffolding, and then forklifts are used to transport the support beams to the hoisting position. Tower cranes or cranes are used to lift the support beams to the ground. The advantages are strong controllability and reduced impact on the surrounding structure, making it suitable for situations with narrow spaces or requiring precise demolition. The disadvantages are that the demolition speed is relatively slow, the temporary scaffolding poses safety hazards, the demolition and transportation process has a significant impact on civil construction, and a supporting frame needs to be set up under the temporary scaffolding.

[0005] Because the segmented cutting and dismantling method offers high controllability, it is primarily used for supporting structures within the foundation pit. However, due to the significant weight of individual support beams (typically 3-5 tons), errors during dismantling can cause them to fall from the scaffolding, leading to safety accidents. The supporting frame is mainly used to distribute the load across the scaffolding. Since the individual support beams are quite heavy, and the scaffolding is only positioned directly beneath the support being dismantled, it can cause localized damage to the intermediate slab. Therefore, the supporting frame, in scaffolding form, serves as temporary support for the scaffolding, ensuring the weight of the support beams is evenly distributed across the intermediate slab. Utility Model Content

[0006] To address the problem of low efficiency in dismantling internal supports in existing foundation pit technologies, this application proposes a suspension-type dismantling device for internal supports in foundation pits. This device includes at least one dismantling and hoisting assembly, each comprising two support frames and a cable. The two support frames in the same assembly are respectively positioned along a first axis on opposite edges of the foundation pit. Both ends of the cable are fixed to a support frame, and a transfer unit is slidably mounted on the cable. The transfer unit includes a lifting device and a hanging part mounted on the lifting device. The lifting device is slidably mounted on the cable, and the hanging part is used to hang the dismantled support section. The lifting device is used to lift the dismantled support section upwards. A traction rope is fixed to the transfer unit, and one end of the traction rope is connected to a traction device fixed to the ground. This traction device can drag the transfer unit towards the edge of the foundation pit, allowing the dismantled support section suspended on the transfer unit to reach the outside of the foundation pit. The first axis extends horizontally. The traction device can specifically employ equipment such as a winch or electric hoist.

[0007] In this application, the two ends of the cable are respectively fixed to the support frames on opposite sides of the foundation pit, so that the cable forms a suspension cable that spans the foundation pit, enabling the hoisting of objects inside the foundation pit.

[0008] When it is necessary to dismantle the supports within the foundation pit, first determine the area to be dismantled, designating it as the pre-dismantling section. Then, tie the lifting rope to the pre-dismantling section and hook it onto the hoisting device. Next, use a cutting machine to cut both ends of the pre-dismantling section, making it the support dismantling section. Then, start the lifting device to raise the support dismantling section above ground level. Start the traction device to drag the support dismantling section above the edge of the foundation pit. Start the lifting device again to lower the support dismantling section to the edge of the foundation pit, bringing it outside the pit. Remove the lifting rope and proceed to dismantle the next support dismantling section. By using the combination of cables and traction ropes, the cut support dismantling sections can be moved to the outside of the foundation pit in one go, eliminating the need to use small transport vehicles to move the support dismantling sections inside the foundation pit, thus improving the efficiency of dismantling the supports inside the foundation pit.

[0009] Because a hoisting method was used, the section to be dismantled was suspended on the cables before being cut at both ends, eliminating the need for scaffolding and temporary supports, thus reducing construction costs. Furthermore, the sling's tension prevented the dismantled section from falling due to errors, improving safety during operations.

[0010] Furthermore, both ends of the traction rope are connected to a traction device. With traction devices at both ends of the traction rope, the support section to be dismantled can be dragged to the nearest edge of the pit, improving dismantling efficiency.

[0011] Furthermore, to improve dismantling efficiency, the horizontal support in the pit extends along the first axis direction. The horizontal support includes several main support beams spaced apart along the second axis direction. The main support beams extend along the first axis direction, and connecting beams are provided between adjacent main support beams. A dismantling and hoisting assembly is provided for each main support beam. The second axis direction extends horizontally and is perpendicular to the first axis direction.

[0012] Specifically, viewed vertically, the cable of a dismantling and hoisting assembly is located in the middle between two adjacent main support beams. The cable in the middle is mainly used to dismantle the connecting beam to reduce the sway amplitude of the support dismantling section after it detaches from the connecting beam. Excessive sway amplitude of the support dismantling section would increase the danger of the operation.

[0013] Specifically, viewed vertically, the cables are positioned directly above or spaced apart from the corresponding main support beam. During construction, different cable placement methods are selected based on the number of horizontal support layers. When there is only one layer of horizontal support in the pit, the cables can be positioned directly above the corresponding main support beam to reduce the sway amplitude of the support removal section after detachment from the main support beam. When there are at least two layers of horizontal support in the pit, the cables can be positioned to one side of the corresponding main support beam, with the cables spaced apart from the main support beam. The distance between the cables and the corresponding main support beam is preferably 0.1-0.5 meters greater than the width of the main support beam of the first layer of horizontal support to avoid obstruction from the upper horizontal support when lifting the support removal section of the lower layer.

[0014] Furthermore, to reduce disassembly costs, the support frame is installed on the crown beam.

[0015] Furthermore, to reduce resistance during the movement of the traction rope and to minimize wear on the traction rope, an upper bogie is installed on top of the support frame. This upper bogie has an upper fixed pulley on which the traction rope presses against.

[0016] Furthermore, a lower bogie is provided, located between the traction device and the support frame. This lower bogie has a lower fixed pulley, and the traction rope passes through the lower bogie and connects to the traction device, pressing against the lower fixed pulley. This design is primarily for traction devices installed on the ground, so that the traction device mainly bears the horizontal tension, reducing the upward tension. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a foundation pit structure with an embodiment of this application installed.

[0018] Figure 2 yes Figure 1 Top view.

[0019] Figure 3 yes Figure 1 Enlarged view of section A.

[0020] Figure 4 yes Figure 1 Enlarged view of section B.

[0021] Figure 5 yes Figure 4 Enlarged view of section C.

[0022] Figure 6 This is a schematic diagram of a foundation pit structure with another embodiment of this application installed.

[0023] Figure 7 yes Figure 6 Top view. Detailed Implementation

[0024] See Figure 1-Figure 3 In the attached diagram, the direction of the first arrow X indicates the direction of the first axis, and the direction of the second arrow Y indicates the direction of the second axis. Both the first and second axial directions extend horizontally and are perpendicular to each other.

[0025] A suspension-type dismantling device for internal support of a foundation pit is disclosed, which is used to dismantle the horizontal support inside the foundation pit. In this embodiment, there is only one layer of horizontal support inside the foundation pit, which is referred to as the first layer of horizontal support 50 according to the usual naming method. There is a support wall 11 formed by support piles on the outer wall of the foundation pit. A cap beam 16 is poured on the top of the support wall 11. A column 14 is set inside the foundation pit. Several first layer of horizontal support 50 are set inside the foundation pit. The attached figure shows an example of a first layer of horizontal support 50. Each first layer of horizontal support includes three main support beams 51 extending along a first axis. The three main support beams 51 are spaced apart along a second axis. A connecting beam is set between two adjacent main support beams 51. In this embodiment, the connecting beam specifically includes a diagonal brace 521 extending obliquely relative to the second axis and a transverse brace 522 extending along the second axis. Figure 1 In the middle, the excavation of the foundation pit has been completed and the bottom slab 15 has been poured.

[0026] In this embodiment, a dismantling and hoisting assembly is provided for each main support beam 51. Each dismantling and hoisting assembly includes two support frames 34 and a cable 31. The two support frames 34 in the same dismantling and hoisting assembly are respectively set on the edges of opposite sides of the foundation pit along the first axis direction. Specifically, in this embodiment, the support frames 34 are fixedly installed on the cap beam 16, and the support frames 34 are made of H-beams. The two ends of the cable are respectively fixed to a support frame, and the transfer part 60 is slidably installed on the cable. The traction rope 32 is set above the cable.

[0027] The transfer unit 60 includes a lifting device and a hanging part mounted on the lifting device. The lifting device is slidably mounted on the cable, and the hanging part is used to hang the dismantled support section 511. The lifting device is used to lift the dismantled support section upwards. In this embodiment, the lifting device is specifically an electric hoist 62, which is slidably fitted onto the cable 31 via a steel ring 61. One end of the connecting rope 63 is fixed to the steel ring 61, and the other end of the connecting rope 63 is fixed to the traction rope 32. That is, the traction rope is fixed to the transfer unit. A hook 64 is installed on the steel cable of the electric hoist.

[0028] In this embodiment, an upper bogie 70 is installed on the top of each support frame. The upper bogie 70 includes a base 71 fixed to the top of the support frame. The base 71 has a first pulley seat 72 protruding upward and a second pulley seat 73 protruding towards the outside of the pit. An upper fixed pulley 74 is rotatably installed on both the first pulley seat and the second pulley seat.

[0029] For each upper bogie, a lower bogie 76 is provided. The lower bogie is located on the side of the support frame away from the pit. Each lower bogie 76 includes a pulley frame 77 fixed to the ground 100 and a lower fixed pulley 78 mounted on the pulley frame. The end of the traction rope 32 passes successively over the upper fixed pulleys on the first pulley seat and the second pulley seat, and then passes over the lower fixed pulley before being fixed to a traction device 33. When the traction rope passes over the upper and lower fixed pulleys, it directly presses against the upper and lower fixed pulleys.

[0030] In this embodiment, both ends of each traction rope 32 are fixed to a traction device. It is understood that in another embodiment, only one end of the traction rope can be fixed to the traction device. When dragging the support removal section 511 to the edge of the pit, the traction device is used, while when dragging the transfer section 60 to the pit area, manual operation is used. This method can only move the support removal section to the edge of the pit in one direction and cannot drag the support removal section to a nearby edge of the pit based on the principle of proximity. Where the construction site permits, it is recommended to install a traction device at both ends of the traction rope. When it is not possible to install traction devices on both sides of the pit, a traction device can be installed at only one end of the traction rope. In this embodiment, a winch is specifically used as the traction device. It is understood that in another embodiment, an electric hoist or other similar device can also be used as the traction device. This application does not have special requirements for the specific type of traction device, as long as it can drag the transfer section 60 to the edge of the pit.

[0031] It is understandable that when there is a suitable mounting frame at the edge of the pit, the traction device can be directly installed on the mounting frame. In this case, there is no need to lower the bogie, only to raise it.

[0032] In this embodiment, since there is only one layer of horizontal support, the cable is located directly above the corresponding main support beam, and the cable can transport the support dismantling section that has been removed from the corresponding main support beam and the connecting beam connected to the main support beam.

[0033] When dismantling the first-level horizontal support 50 of a certain frame, first determine the section of main support beam or connecting beam that needs to be dismantled. For ease of description, this section of main support beam or connecting beam that needs to be dismantled is referred to as the pre-removal section 510. For clarity, in... Figure 2 In the diagram, the pre-removal section 510 is represented by shaded areas. After determining the pre-removal section 510, the hoisting rope 69 is first tied to the pre-removal section and hooked onto the hook 64. Then, the two ends of the pre-removal section 510 are cut off using a cutting machine, making the pre-removal section 510 a support demolition section 511. The electric hoist 62, which acts as a lifting device, is then started to raise the support demolition section 511 above the ground level. The traction device 33 is then started to drag the support demolition section above the edge of the pit. The electric hoist 62, which acts as a lifting device, is started again to lower the support demolition section to the edge of the pit, so that the support demolition section reaches the outside of the pit. The hoisting rope 69 is then removed, and the demolition of the next support demolition section begins.

[0034] It is understood that in other embodiments, each first-layer horizontal support may include only two main support beams 51, or have four or more main support beams 51.

[0035] Example 2

[0036] Please see Figure 6 and Figure 7 This embodiment is basically the same as Embodiment 1, except that:

[0037] In this embodiment, two layers are provided within the foundation pit: a first layer of horizontal support 50 and a second layer of horizontal support 40. The second layer of horizontal support is located below the first layer of horizontal support. Figure 7 In this embodiment, the first-layer horizontal support 50 is removed, and a second-layer horizontal support 40 is shown as an example. Each second-layer horizontal support 40 in this embodiment includes three main support beams B41 extending along the first axis. The three main support beams B41 are spaced apart along the second axis, and a connecting beam B is provided between two adjacent main support beams B41. In this embodiment, the connecting beam B specifically includes a diagonal brace B421 extending obliquely relative to the second axis and a transverse brace B422 extending along the second axis. The structure of the first-layer horizontal support is similar to that of the second-layer horizontal support, and will not be described again. The second-layer horizontal support is connected to the waler 12 on the inner wall of the retaining wall 11.

[0038] Because this embodiment has two layers of horizontal support, the ease of disassembling the second layer of horizontal support needs to be considered when installing the cables. Therefore, in this embodiment, different cables are provided for the main support beam B41 and the connecting beam. For ease of description, the cable corresponding to the main support beam B41 is referred to as the first cable 311, and a first traction rope 321 is provided above the first cable. The cable corresponding to the connecting beam is referred to as the second cable 312, and a second traction rope 322 is provided above the second cable.

[0039] Viewed vertically, the first cable 311 and its corresponding main support beam B41 are spaced apart. Since the main support beam B41 and the main support beam 51 are vertically opposite each other, the first cable 311 and its corresponding main support beam 51 are spaced apart when viewed vertically. In this embodiment, the width of both the main support beam 51 and the main support beam B41 is 0.8 meters in the second axis direction. The distance between the first cable and the main support beams 51 and B41 is 1 meter to avoid interference from the first layer of horizontal support when the support dismantling section of the second layer of horizontal support is lifted upward, thus affecting the dismantling efficiency. There are no special requirements for the distance between the first cable and the main support beams 51 and B41. For the purpose of facilitating the dismantling of the second layer of horizontal support, the distance between the first cable and the main support beams 51 and B41 can exceed the width of the main support beam of the first layer of horizontal support by 0.1-0.5 meters, which can be set according to the specific conditions during construction.

[0040] Viewed vertically, the second cable 312 is located in the middle between the corresponding main support beams B41. The second cable 312 is used to dismantle the connecting beam between the first and second horizontal supports.

[0041] When dismantling the second-level horizontal support 40 of a certain frame, first determine the section of main support beam B or connecting beam B that needs to be dismantled. For ease of description, this section of main support beam B or connecting beam B that needs to be dismantled is referred to as the pre-dismantling section B410. For clarity, in... Figure 7 In the diagram, the pre-removal section B410 is represented by shaded areas. After determining the pre-removal section B410, the hoisting rope 69 is first tied to the pre-removal section B and hooked onto the hook 64. Then, the two ends of the pre-removal section B410 are cut off using a cutting machine, making the pre-removal section B410 a support demolition section B411. The electric hoist 62, which acts as a lifting device, is then started to raise the support demolition section B411 above the ground level. The traction device 33 is then started to drag the support demolition section B above the edge of the pit. The electric hoist 62, which acts as a lifting device, is started again to lower the support demolition section B to the edge of the pit, so that the support demolition section B reaches the outside of the pit. The hoisting rope 69 is then removed, and the demolition of the next section of support demolition section B begins.

[0042] The method for removing the first layer of horizontal support 50 is similar to the method for removing the second layer of horizontal support 40.

Claims

1. A cable-stayed demolition device for internal support of a foundation pit, characterized in that, The system includes at least one dismantling and hoisting assembly. Each assembly comprises two support frames and a cable. The two support frames in the same assembly are respectively positioned on opposite edges of the pit along a first axis. Both ends of the cable are fixed to a support frame, and a transfer unit is slidably mounted on the cable. The transfer unit includes a lifting device and a hanging part mounted on the lifting device. The lifting device is slidably mounted on the cable, and the hanging part is used to hang the dismantled support section. The lifting device is used to lift the dismantled support section upwards. A traction rope is fixed to the transfer unit, and one end of the traction rope is connected to a traction device fixed to the ground. The traction device can drag the transfer unit toward the edge of the pit and bring the dismantled support section suspended on the transfer unit to the outside of the pit. The first axis extends horizontally.

2. The suspension-type demolition device according to claim 1, characterized in that, Both ends of the traction rope are connected to a traction device.

3. The suspension-type demolition device according to claim 1, characterized in that, The horizontal support within the foundation pit extends along the first axis direction. The horizontal support includes several main support beams spaced apart along the second axis direction. The main support beams extend along the first axis direction, and connecting beams are provided between adjacent main support beams. A disassembly and hoisting assembly is provided for each main support beam. The second axis direction extends horizontally and is perpendicular to the first axis direction.

4. The suspension-type demolition device according to claim 3, characterized in that, Viewed vertically, the cable of a dismantling and hoisting assembly is located in the middle between two adjacent main support beams.

5. The suspension-type demolition device according to claim 3, characterized in that, Viewed vertically, the cables are positioned directly above or spaced apart from the corresponding main support beams.

6. The suspension-type demolition device according to claim 1, characterized in that, The support frame is installed on the crown beam.

7. The suspension-type demolition device according to claim 1, characterized in that, An upper bogie is installed on top of the support frame. The upper bogie has an upper fixed pulley, and the traction rope presses against the upper fixed pulley.

8. The suspension-type demolition device according to claim 1, characterized in that, It is also equipped with a lower bogie, which is located between the traction device and the support frame. The lower bogie has a lower fixed pulley, and the traction rope is connected to the traction device after passing through the lower bogie. The traction rope presses against the lower fixed pulley.

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