Deep foundation pit excavation, replacement and support device and method

Abstract

The invention relates to the technical field of building construction, in particular to a deep foundation pit excavation, replacement and support device and method. Comprising I-shaped steel, a supporting steel beam, a limiting assembly and an anti-skid assembly, the limiting assembly comprises a first attaching block, a second attaching block and a connecting pull rod, the adopted supporting steel beam is an annular steel pipe with a certain thickness, and therefore during supporting, compared with a traditional concrete structure, the maintenance time is shortened; and the supporting steel beam of a novel steel structure is adopted, so that the overall installation impression is good, the construction period can be shortened, the environment-friendly construction concept is adapted, and the secondary recycling rate is increased.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and in particular to a deep foundation pit excavation and replacement support device and method. Background Technology

[0002] Deep foundation pit excavation and replacement support is a form of foundation pit support, mainly used to treat the sidewalls of foundation pits with complex geological conditions or insufficient bearing capacity. Its core is to improve the physical and mechanical properties of the original soil by replacing it with high-quality soil layers or materials (such as sand, gravel, etc.), thereby enhancing the stability of the sidewalls and preventing collapse or deformation.

[0003] Under current technology, traditional reinforced concrete cap beams require at least 14 days of curing after pouring, which is not conducive to optimizing the construction period. Furthermore, the subsequent demolition of the cap beam is not economical and is not conducive to secondary use. Summary of the Invention

[0004] The purpose of this invention is to provide a deep foundation pit excavation and replacement support device and method. By adopting a new type of steel structure support steel beam, the overall installation has a good appearance, can shorten the construction period, adapt to the concept of green construction, and enhance the secondary recycling rate.

[0005] To achieve the above objectives, the present invention provides a deep foundation pit excavation and backfilling support device, including I-beams, and a support steel beam is provided between two I-beams through a limiting component; The limiting component includes a first fitting block, a second fitting block, and a connecting rod. The first fitting block and the second fitting block are detachably connected. After assembly, the first fitting block and the second fitting block are connected between the I-beams via the connecting rod. The first fitting block and the second fitting block are located at the top end position of the support steel beam. The first bonding block is provided with a toothed groove, which is symmetrically arranged and slides into contact with the toothed protrusion on the second bonding block. The first bonding block and the second bonding block are also respectively provided with anti-slip components, which are located on the outside of the support steel beam.

[0006] Protective tubes are respectively fitted onto the connecting rods between the I-beam and the first and second bonding blocks, and the inner and outer surfaces of the protective tubes are coated with a 0.08mm thick polyurethane coating.

[0007] The anti-slip component includes an anti-slip plate and a fixing member. The anti-slip plate is arranged in annular intervals within the inner mounting cavities of the first and second bonding blocks and is fixed by the fixing member.

[0008] The fixing component includes an upper positioning block and a lower positioning block, which are integrally disposed on the upper and lower sides of the anti-slip plate and are fixedly connected to the first bonding block and the second bonding block, respectively.

[0009] The connecting rod, located away from the end of its limiting disc, has a through hole on its external threaded end, and a cotter pin is installed in the hole.

[0010] The deep foundation pit excavation and backfilling support device also includes a stabilizing component, which includes a connecting plate and a limiting member. The connecting plate is used for connection and cooperation between the two first mating blocks and the second mating block. The limiting member is located on the side of the I-beam near the connecting tie rod.

[0011] The limiting component includes a limiting plate and a U-shaped frame. The limiting plate is detachably connected to the I-beam and abuts against the two end faces of the connecting rod. The round rod of the U-shaped frame passes through the I-beam and the limiting plate respectively, and is limited at the bottom by a nut.

[0012] One method for deep foundation pit excavation and replacement support includes the following steps: Positioning pile holes for support steel beams of standard depth are machined at corresponding positions on the sidewall of the deep foundation pit using a pile driver. The support steel beams of the appropriate length are hoisted and the bottom ends of the support steel beams are installed in the pile holes; Assemble the first and second bonding blocks onto the port at the top of the support steel beam; The first and second bonding blocks are assembled between two I-beams by connecting tie rods, thereby forming a stable connection structure between the top ends of the support steel beams.

[0013] This invention discloses a deep foundation pit excavation and replacement support device. During construction, a pile driver first processes positioning pile holes of standard depth for spaced support steel beams at corresponding positions on the sidewall of the deep foundation pit. Support steel beams of the appropriate length are then hoisted and installed at their bottom ends within the pile holes. A first and second bonding block are assembled onto the top end of the support steel beam. Finally, a connecting rod is used to assemble the first and second bonding blocks between two I-beams, forming a stable connection structure between the top ends of the support steel beams. The support steel beams used in this application are annular steel pipes with a certain thickness, which reduces curing time compared to traditional concrete structures and allows for secondary recycling. Furthermore, the use of these novel steel structure support beams results in a better overall appearance, shortens the construction period, aligns with green construction principles, and enhances the rate of secondary recycling. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0015] Figure 1 This is a schematic diagram of the overall structure of the deep foundation pit excavation and replacement support device according to the first embodiment of the present invention.

[0016] Figure 2 This is a schematic diagram of the structure of the first bonding block according to the first embodiment of the present invention.

[0017] Figure 3 This is a schematic diagram of the overall structure of the deep foundation pit excavation and replacement support device according to the second embodiment of the present invention.

[0018] Figure 4 This is a schematic diagram of the upper conical column structure according to the third embodiment of the present invention.

[0019] Figure 5 This is a flowchart of a deep foundation pit excavation, replacement, and support method according to the present invention.

[0020] In the diagram: 101-I-beam, 102-support steel beam, 103-first bonding block, 104-second bonding block, 105-connecting tie rod, 106-toothed groove, 107-toothed protrusion, 108-protective tube, 109-anti-slip plate, 110-upper positioning block, 111-lower positioning block, 201-connecting plate, 202-limiting plate, 203-U-shaped frame, 301-upper cone column, 302-lower cone column. Detailed Implementation

[0021] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0022] Example 1: like Figure 1 and Figure 2 As shown, where Figure 1 This is a schematic diagram of the overall structure of the deep foundation pit excavation and replacement support device. Figure 2This is a schematic diagram of the structure of the first bonding block 103. The present invention provides a deep foundation pit excavation and backfilling support device: including an I-beam 101, a support steel beam 102, a limiting component, and an anti-slip component. The limiting component includes a first bonding block 103, a second bonding block 104, and a connecting rod 105. The anti-slip component includes an anti-slip plate 109 and a fixing component. The fixing component includes an upper positioning block 110 and a lower positioning block 111. The aforementioned solution, by using a new type of steel structure support steel beam, achieves a good overall installation appearance, shortens the construction period, adapts to the concept of green construction, and enhances the secondary recycling rate. It is understood that the aforementioned solution can shorten the construction period, adapt to the concept of green construction, and enhance the secondary recycling rate.

[0023] In this embodiment, the I-beam 101 is used in conjunction with the multiple support beams 102.

[0024] Among them, a support steel beam 102 is provided between the two I-beams 101 through a limiting component; the support steel beam 102 is a steel pipe with a circular ring structure.

[0025] The first bonding block 103 and the second bonding block 104 are detached and connected. After assembly, the first bonding block 103 and the second bonding block 104 are connected between the I-beams 101 via the connecting rod 105. The first bonding block 103 and the second bonding block 104 are located at the top end of the support beam 102. After assembly, the first bonding block 103 and the second bonding block 104 form an integral structure with a circular clamping cavity, thereby stably connecting the top ends of the support beam 102.

[0026] The first bonding block 103 is provided with a toothed groove 106, which is symmetrically arranged and slides into and engages with the toothed protrusion 107 on the second bonding block 104; the toothed groove 106 and the toothed protrusion 107 cooperate to assemble the first bonding block 103 and the second bonding block 104.

[0027] The first bonding block 103 and the second bonding block 104 are also respectively provided with anti-slip components, which are located on the outer side of the support steel beam 102. The protective components are used to improve the stability of the support device.

[0028] Secondly, protective tubes 108 are respectively fitted onto the connecting rods 105 between the I-beam 101 and the first bonding block 103 and the second bonding block 104. The inner and outer surfaces of the protective tubes 108 are coated with a 0.08mm thick polyurethane coating. During installation, one end of the protective tube 108 is welded to the outside of the through hole in the first bonding block 103 or the second bonding block 104 through which the connecting rod 105 passes, and is concentrically arranged. The protective tube 108 is used to protect the end area of ​​the connecting rod 105 outside the first bonding block 103 and the second bonding block 104.

[0029] Then, the anti-slip plate 109 is arranged in a ring at intervals within the inner mounting cavities of the first bonding block 103 and the second bonding block 104, and is fixed by the fixing member. The inner and outer surfaces of the anti-slip plate 109 that contact the support steel beam 102 are provided with an anti-slip textured structure. The fixing member is used to fix the anti-slip plate 109 and also facilitates the replacement of the anti-slip plate 109.

[0030] Furthermore, the upper positioning block 110 and the lower positioning block 111 are integrally disposed on the upper and lower sides of the anti-slip plate 109, respectively, and are fixedly connected to the first bonding block 103 and the second bonding block 104, respectively. The upper positioning block 110 and the lower positioning block 111 are fixed by multiple bolts, thereby realizing the fixation of the anti-slip plate 109.

[0031] Finally, the connecting rod 105, away from its limiting disc end, has a through hole on its externally threaded end, into which a cotter pin is installed. This structure facilitates the limiting nut on the T-shaped connecting rod 105 for positioning.

[0032] When using the deep foundation pit excavation and replacement support device of the present invention, during construction, firstly, positioning pile holes of standard depth and spaced arrangement of the support steel beams 102 are machined at corresponding positions on the side wall of the deep foundation pit using a pile driver. The support steel beams 102 of the appropriate length are then hoisted and the bottom end of the support steel beams 102 is installed in the pile holes. The first bonding block 103 and the second bonding block 104 are then assembled on the top end of the support steel beam 102. Finally, the first bonding block 103 and the second bonding block 104 are connected by the connecting rod 105. The second bonding block 104 is assembled between the two I-beams 101, thereby forming a stable connection structure between the top ends of the support steel beam 102. The support steel beam 102 used in this application is a circular steel pipe with a certain thickness, which reduces the curing time compared with the traditional concrete structure during support, and can also be recycled and reused. Thus, by using the new type of steel structure support steel beam, the overall installation appearance is good, the construction period is shortened, and the concept of green construction is adapted to enhance the secondary recycling rate.

[0033] Example 2: like Figure 3 As shown, where Figure 3 This is a schematic diagram of the overall structure of a deep foundation pit excavation and replacement support device. Based on the first embodiment, this invention provides a deep foundation pit excavation and replacement support device, which further includes a stabilizing component. The stabilizing component includes a connecting plate 201 and a limiting component. The limiting component includes a limiting plate 202 and a U-shaped frame 203.

[0034] The connecting plate 201 is used for connection and engagement between the two first mating blocks 103 and the second mating block 104; the limiting member is disposed on the side of the I-beam 101 near the connecting rod 105. The two ends of the connecting plate 201 are respectively fixed by bolts, and the limiting member is used to further improve the stability of the connecting rod 105.

[0035] Secondly, the limiting plate 202 is detachably connected to the I-beam 101 and abuts against the two end faces of the connecting rod 105; the round rod of the U-shaped frame 203 passes through the I-beam 101 and the limiting plate 202 respectively, and is limited at the bottom by a nut. The limiting plate 202 has two vertical through holes for easy alignment with the round rod of the U-shaped frame 203, and the I-beam 101 has mating through holes. A nut is installed on the externally threaded end of the bottom of the U-shaped frame 203 for limitation.

[0036] In this embodiment, by setting the connecting plate 201, the stability between the first bonding block 103 and the second bonding block 104 can be improved. The limiting plate 202 and the U-shaped frame 203 can improve the stability of the connecting rod 105.

[0037] Example 3: like Figure 4 As shown, where Figure 4 This is a structural schematic diagram of the upper cone column 301. Based on the first embodiment, the present invention provides a deep foundation pit excavation and replacement support device. The deep foundation pit excavation and replacement support device also includes a matching component, which includes the upper cone column 301 and the lower cone column 302.

[0038] The upper conical column 301 and the lower conical column 302 are integrally mounted on the first mating block 103 and engage with the conical holes on the second mating block 104. The upper conical column 301 and the lower conical column 302 can be positioned during the assembly of the first mating block 103 and the second mating block 104. The upper conical column 301 and the lower conical column 302 are similar to a tapered pin structure. The tapered surface of the conical pin can transmit axial force and achieve self-locking. Especially under impact or vibration, the half-cone angle (approximately 0.57 degrees) is much smaller than the friction angle between steel and steel (approximately 8.53 degrees), effectively preventing loosening. The taper of the conical pin makes it easy to align with the hole during installation, and its position can be adjusted by axial tapping. Disassembly only requires a slight tap to loosen it, reducing maintenance difficulty.

[0039] In this embodiment, by setting the upper conical column 301 and the lower conical column 302, the assembly stability of the first bonding block 103 and the second bonding block 104 will be further improved without affecting subsequent disassembly.

[0040] Finally, as Figure 5 As shown, where Figure 5 This is a flowchart of a deep foundation pit excavation and replacement support method according to the present invention. The present invention provides a deep foundation pit excavation and replacement support method, including the following steps: S1: Using a pile driver, positioning pile holes of standard depth and spaced-apart support steel beams 102 are machined at corresponding positions on the sidewall of the deep foundation pit; S2: Hoist the support steel beam 102 of the appropriate length and install the bottom end of the support steel beam 102 into the pile hole; S3: Assemble the first bonding block 103 and the second bonding block 104 on the port at the top of the support steel beam 102; S4: The first bonding block 103 and the second bonding block 104 are assembled between the two I-beams 101 by connecting the tie rod 105, thereby forming a stable connection structure between the top ends of the support steel beam 102.

[0041] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A deep foundation pit excavation and backfilling support device, comprising I-beams, characterized in that: A support steel beam is provided between the two I-beams via a limiting component; The limiting component includes a first fitting block, a second fitting block, and a connecting rod. The first fitting block and the second fitting block are detachably connected. After assembly, the first fitting block and the second fitting block are connected between the I-beams via the connecting rod. The first fitting block and the second fitting block are located at the top end position of the support steel beam. The first bonding block is provided with a toothed groove, which is symmetrically arranged and slides into contact with the toothed protrusion on the second bonding block. The first bonding block and the second bonding block are also respectively provided with anti-slip components, which are located on the outside of the support steel beam.

2. The deep foundation pit excavation and replacement support device as described in claim 1, characterized in that: Protective tubes are respectively fitted onto the connecting rods between the I-beam and the first and second bonding blocks, and the inner and outer surfaces of the protective tubes are coated with a 0.08mm thick polyurethane coating.

3. The deep foundation pit excavation and replacement support device as described in claim 1, characterized in that: The anti-slip assembly includes an anti-slip plate and a fixing component. The anti-slip plate is arranged in a ring at intervals within the inner mounting cavity of the first and second bonding blocks and is fixed by the fixing component.

4. The deep foundation pit excavation and replacement support device as described in claim 3, characterized in that: The fixing component includes an upper positioning block and a lower positioning block, which are integrally disposed on the upper and lower sides of the anti-slip plate and are fixedly connected to the first bonding block and the second bonding block, respectively.

5. The deep foundation pit excavation and replacement support device as described in claim 1, characterized in that... : The connecting rod, located away from the end of its limiting disc, has a through hole on its external threaded end, into which a cotter pin is installed.

6. The deep foundation pit excavation and replacement support device as described in claim 1, characterized in that: The deep foundation pit excavation and backfilling support device also includes a stabilizing component, which includes a connecting plate and a limiting member. The connecting plate is used for connection and engagement between the two first mating blocks and the second mating block. The limiting member is located on the side of the I-beam near the connecting tie rod.

7. The deep foundation pit excavation and replacement support device as described in claim 6, characterized in that: The limiting component includes a limiting plate and a U-shaped frame. The limiting plate is detachably connected to the I-beam and abuts against the two end faces of the connecting rod. The round rod of the U-shaped frame passes through the I-beam and the limiting plate respectively, and is limited at the bottom by a nut.

8. A method for deep foundation pit excavation and replacement support, applicable to the deep foundation pit excavation and replacement support device as described in any one of claims 1 to 7, characterized in that, Includes the following steps: Positioning pile holes for support steel beams of standard depth are machined at corresponding positions on the sidewall of the deep foundation pit using a pile driver. The support steel beams of the appropriate length are hoisted and the bottom ends of the support steel beams are installed in the pile holes; Assemble the first and second bonding blocks onto the port at the top of the support steel beam; The first and second bonding blocks are assembled between two I-beams by connecting tie rods, thereby forming a stable connection structure between the top ends of the support steel beams.

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