Deep foundation pit inner support partitioned support inclined beam structure for unenclosed basement working condition

Abstract

The utility model discloses a deep foundation pit inner support partitioned support replacement inclined beam structure for unsealed basement working condition, including the foundation pit enclosure structure in same construction partition. The unsealed basement structure of having constructed, inner support structure, is divided into removable inner support and reserved inner support, and the reserved inner support includes reserved support column and reserved support beam, and the reserved support beam is the section connected with the foundation pit enclosure structure, support replacement inclined beam is arranged between the negative one floor and the reserved support beam. The utility model increases the I -steel inclined support, connects the basement structure and the inner support beam of having completed construction, provides the alternative force transmission path, reaches the purpose of partitioned safe support replacement. The lateral earth pressure that the soil body transmits to the support structure is offset by the basement structure of having completed construction, and then the inner support in the main building area under the above working condition can be removed in advance, can shorten the main building construction period, and the support replacement inclined beam does not need to be synchronous with the main structure and pours, also saves the construction period.

Description

Technical Field

[0001] This utility model belongs to the field of foundation pit support, and in particular, it is a structural design of inclined beams for supporting partitions in deep foundation pits with unsealed basements. Background Technology

[0002] In modern building construction, the use of internal bracing in conjunction with deep foundation pits is widespread. However, internal bracing structures often conflict spatially with the main structure and must be removed before the main structure is completed. Traditionally, the safe removal of internal bracing requires the construction of the load-bearing structure below its projection direction. This includes the completion of the corresponding basement structure (such as the floor slab, walls, columns, and floors) and specific replacement support components (such as replacement beams, tie beams, and dowel bars) to meet design strength requirements. The aim is to ensure the safe transfer of the load path of the foundation pit support system during removal. Therefore, internal bracing removal can only proceed after a complete and enclosed structural system has been formed throughout the entire basement.

[0003] This requirement leads to significant problems: because basements are typically constructed in sections, the time required for the entire underground structure to be completed is substantial. If internal supports cannot be removed in a timely manner in sections, it will severely hinder the continuous construction of the upper main structure (such as the main building structure area), causing significant downtime and delaying the overall project schedule. Furthermore, improper removal in certain areas can easily trigger a redistribution of internal forces within the support system, leading to excessive deformation of the retaining structure (such as retaining piles or diaphragm walls), posing a safety hazard.

[0004] To address the aforementioned challenges, traditional publicly available solutions involve replacing beams or slabs with concrete supports. However, this technology suffers from the following key drawbacks:

[0005] 1. Reliance on the overall structural integrity: The replacement support components need to be poured simultaneously with the corresponding parts of the main structure. This means that the corresponding basement area (floor slab, floor slab, walls, etc.) must be fully constructed before the replacement support work can be carried out.

[0006] Second, the curing period is long: after the concrete support components are poured, they require a relatively long curing period (usually about 28 days) to reach the design strength requirements. This further increases the construction waiting time.

[0007] Third, the inability to implement the plan in sections: The above two constraints make it impossible to carry out the section support replacement operation in the traditional way when the basement structure has not yet formed a complete and closed whole.

[0008] Therefore, there is an urgent need for a new type of support replacement technology that can safely remove internal supports in sections when the local structure has the necessary conditions, without waiting for the basement to be completely enclosed. This technology is suitable for situations where conventional support replacement is not feasible. Utility Model Content

[0009] The purpose of this utility model is to provide a structural design for a partitioned support beam in a deep foundation pit for unsealed basement construction. It aims to solve the technical problem that existing concrete support beams and slabs need to be poured simultaneously with the main structure, resulting in a delay in the support replacement work; it also aims to solve the technical problem that the curing time of concrete support components is long and the construction period is slow; and it also aims to solve the technical problem that the support replacement operation cannot be carried out in the traditional way when the basement structure has not yet formed a complete and enclosed whole.

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] A deep foundation pit support partition replacement inclined beam structure for unenclosed basement construction, including: foundation pit retaining structure within the same construction partition;

[0012] The unenclosed basement structure that has been constructed is set along the inner side of the foundation pit retaining structure, and from bottom to top includes the basement floor slab, the first basement floor slab, and the basement roof slab.

[0013] The internal support structure is located above the first basement floor slab and below the basement roof slab. It is fixedly connected to the foundation pit retaining structure through walers. It is divided into removable internal supports and reserved internal supports. The reserved internal supports include reserved support columns and reserved support beams. The reserved support beams are segments that are connected to the foundation pit retaining structure.

[0014] The replacement support beam is set between the basement floor slab and the reserved support beam.

[0015] The placement of the replacement support beams is designed to ensure that each reserved support beam is equipped with the correct points.

[0016] The replacement support beams are set in groups at each arrangement point, and each group has no less than two support beams set parallel to the reserved support beam.

[0017] The lines connecting each arrangement point are adapted to the outline of the adjacent foundation pit retaining structure on the same side.

[0018] Pre-embedded steel components are embedded in the basement slab of the location, and the bottom surface of the replacement support beam is fixedly connected to the top surface of the pre-embedded steel components.

[0019] The embedded steel components include a horizontal embedded plate and embedded anchor rods. The embedded anchor rods are U-shaped, with their top edge welded to the bottom surface of the horizontal embedded plate and their legs embedded in the base plate of the first basement level. The horizontal embedded plate protrudes from the top surface of the base plate of the first basement level.

[0020] The reserved support beams at the layout points are connected to the connecting top steel plate by connectors anchored from the bottom surface, and the top surface of the replacement support beam is fixedly connected to the bottom surface of the connecting top steel plate.

[0021] The connector is a chemical bolt.

[0022] The crossbeams are made of I-beams, and their slope ranges from 45 degrees to 60 degrees.

[0023] The foundation pit retaining structure includes interlocking inner support piles and outer waterproof piles. The walers are fixedly connected to the inner side of the support piles, and a reserved support beam is connected to the walers.

[0024] Compared with the prior art, this utility model has the following features and beneficial effects:

[0025] This utility model is applicable to foundation pit support projects using internal support beams. In situations where conventional support replacement is not feasible, it creatively utilizes the existing, unsealed basement structure, adding I-beam diagonal braces to connect the completed basement structure to the internal support beams, providing an alternative force transmission path and achieving the goal of safe, zoned support replacement. The completed basement structure offsets the lateral earth pressure transmitted from the soil to the support structure, ensuring the integrity and safety of the support structure. This allows for the early removal of supports within the main building area under the aforementioned conditions, avoiding idle work during segmented, continuous construction operations, shortening the main building construction cycle, and reducing scaffolding investment and rental costs.

[0026] This utility model is easy to install, is made of I-beams, and does not require simultaneous pouring with the main structure, thus saving construction time. Attached Figure Description

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

[0028] Figure 1 This is a schematic diagram of the foundation pit plan structure applying this utility model and the partition locations of this embodiment.

[0029] Figure 2 yes Figure 1 Detailed diagram of the points arranged in the partition in this embodiment.

[0030] Figure 3 This is a side view structural diagram of this embodiment.

[0031] Figure 4 This is an enlarged view of the connection of a single support beam.

[0032] Figure 5 This is a structural schematic diagram of the embedded steel components.

[0033] Figure 6 yes Figure 5 Schematic diagram of the AA section.

[0034] Figure 7 yes Figure 5 Schematic diagram of the cross-section of BB.

[0035] Attached reference numerals: 1 - foundation pit retaining structure, 11 - support pile, 12 - waterproof pile, 2 - basement floor slab, 3 - first basement floor slab, 4 - basement roof slab, 5 - waler, 6 - removable internal support, 7 - reserved internal support, 71 - reserved support column, 72 - reserved support beam, 8 - replacement support inclined beam, 81 - support beam, 9 - layout point, 10 - embedded steel parts, 101 - horizontal embedded plate, 102 - embedded anchor rod, 20 - connector, 21 - connecting top steel plate. Detailed Implementation

[0036] See the examples. Figure 1-2 As shown, the foundation pit is divided into seven construction zones. This embodiment takes the lower right zone as an example. A type of inclined beam structure for supporting zones in deep foundation pits with unsealed basements includes the following components within this construction zone:

[0037] See Figure 3 As shown, the foundation pit retaining structure 1 includes interlocking inner support piles 11 and outer waterproof piles 12. The support piles 11 are used to resist soil pressure, and the waterproof piles 12 are used to stop water flow, together forming the foundation pit retaining system. The waler 5 is fixedly connected to the inner side of the support piles 11, and the top of the support piles 11 is provided with a pile cap beam.

[0038] The constructed but unenclosed basement structure is set along the inner side of the foundation pit retaining structure 1, and from bottom to top includes the basement floor slab 2, the first basement floor slab 3, and the basement roof slab 4.

[0039] The internal support structure is located above the basement floor slab 3 and below the basement roof slab 4. It is fixedly connected to the foundation pit retaining structure 1 through the waler 5. It is divided into a removable internal support 6 and a reserved internal support 7. The reserved internal support 7 includes a reserved support column 71 and a reserved support beam 72. The reserved support beam 72 is a segment that is retained and connected to the waler 5.

[0040] The replacement support beam 8 is set between the basement floor slab 3 and the reserved support beam 72.

[0041] Within a construction zone, the arrangement points 9 of the replacement bracing inclined beam 8 need to be designed, as follows:

[0042] The arrangement points 9 of the replacement support beam 8 are set to ensure that each reserved support beam 72 is set to the standard. It can be set at the position of a single reserved support beam 72 or at the position of intersecting reserved support beams 72.

[0043] The replacement bracing beams 8 are arranged in groups at each arrangement point 9, and each group has no less than two support beams 81 arranged parallel to the reserved support beams 72. In this embodiment, each group has three support beams 81. The support beams 81 are made of I-beams. In this embodiment, No. 18 I-beams are used, and their slope range is 45 degrees to 60 degrees. This angle range optimizes the force transmission efficiency and reduces bending moment.

[0044] The lines connecting each arrangement point 9 conform to the outline of the adjacent foundation pit retaining structure 1 on the same side, ensuring that the stress points do not differ too much when offsetting lateral earth pressure, such as... Figure 2 As shown, the line connecting the arrangement points 9 is roughly parallel to the outline of the support piles 11 to ensure uniform stress distribution.

[0045] See Figure 1-2 As shown in this embodiment, six arrangement points 9 are set on the inner side of the horizontal foundation pit retaining structure 1 within the construction zone.

[0046] See Figure 4-7 As shown, embedded steel components 10 are pre-embedded in the basement slab 3 of location 9. The bottom surface of the supporting inclined beam 8 is fixedly connected to the top surface of the embedded steel components 10. The embedded steel components 10 include a horizontal embedded plate 101 and embedded anchor rods 102. The top end of the embedded anchor rods 102 is welded to the bottom surface of the horizontal embedded plate 101. The embedded anchor rods 102 are embedded in the basement slab 3 of the first floor, while the horizontal embedded plate 101 protrudes from the top surface of the basement slab 3 of the first floor. In this embodiment, the embedded anchor rods 102 are three U-shaped HRB400 steel bars, including a top edge and two legs. The top edge is fully welded to the horizontal embedded plate, and the length of the legs is 300mm. The horizontal embedded plate 101 is made of Q235 steel plate with a thickness of 20mm, a length of 600mm, and a width of 400mm.

[0047] See Figure 4 As shown, the reserved support beam 72 at arrangement point 9 is connected to the connecting top steel plate 21 by a connector 20 anchored from the bottom surface. The top surface of the replacement support beam 8 is fixedly connected to the bottom surface of the connecting top steel plate 21. In this embodiment, the connector 20 is an M20 chemical bolt, and the connecting top steel plate 21 is made of Q235 steel plate with a thickness of 20mm.

[0048] The construction process of this utility model is as follows:

[0049] Step 1: Design and calculate the lateral earth pressure within the zone in advance, determine the layout points 9 of the replacement support beam 8, the number of support beams 81, and the size of support beams 81; pre-embed steel parts 10, connect top steel plate 21, and chemical bolts;

[0050] Step two: Process the various components and transport them to the construction site;

[0051] Step 3: The embedded steel component 10 is pre-embedded at the layout point 9 during the construction of the basement structure.

[0052] Step 4: At the arrangement point 9, fix the connecting top steel plate 21 to the bottom surface of the reserved support beam 72 with chemical bolts;

[0053] Step 5: Fully weld the bottom end of the replacement beam 8 to the horizontal embedded plate 101, and fully weld the top end of the replacement beam 8 to the connecting top steel plate 21.

[0054] Step 6: Wait until the structural strength of the basement meets the requirements, and the replacement inclined beam 8 can offset the lateral earth pressure transmitted from the soil to the foundation pit retaining structure 1. Then, the removal of the removable internal support 6 can be carried out.

Claims

1. A deep foundation pit inner support zoning and leaning beam construction for an unenclosed basement working condition, characterized in that, Including those within the same construction zone: Foundation pit retaining structure (1); The unenclosed basement structure that has been constructed is set along the inner side of the foundation pit retaining structure (1), and from bottom to top includes the basement floor slab (2), the first basement floor slab (3), and the basement roof slab (4). The internal support structure is located above the basement floor slab (3) and below the basement roof slab (4). It is fixedly connected to the foundation pit retaining structure (1) through walers (5). It is divided into removable internal supports (6) and reserved internal supports (7). The reserved internal supports (7) include reserved support columns (71) and reserved support beams (72). The reserved support beams (72) are segments connected to the foundation pit retaining structure (1). The replacement support beam (8) is set between the basement floor slab (3) and the reserved support beam (72).

2. The deep foundation bracing zoning and leaning beam construction in an open basement working condition according to claim 1, characterized in that: The arrangement points (9) of the replacement support beams (8) are set to ensure that each reserved support beam (72) is set to the standard.

3. The deep foundation pit inner support zoning and leaning beam structure for unenclosed basement working condition according to claim 1 or 2, characterized in that: The replacement support beams (8) are set in groups at each arrangement point (9), and each group has no less than two support beams (81) set parallel to the reserved support beam.

4. The deep foundation bracing zoning and leaning beam construction in an open basement working condition according to claim 3, characterized in that: The lines connecting each arrangement point (9) are adapted to the outline of the adjacent foundation pit retaining structure (1) on the same side.

5. The deep foundation bracing zoning and leaning beam construction for open basement working condition according to claim 3, characterized in that: An embedded steel component (10) is pre-embedded in the base plate (3) of the first floor of the layout point (9), and the bottom surface of the replacement support beam (8) is fixedly connected to the top surface of the embedded steel component (10).

6. The deep foundation bracing zoning and leaning beam construction in an open basement working condition according to claim 5, characterized in that: The embedded steel component (10) includes a horizontal embedded plate (101) and an embedded anchor rod (102). The embedded anchor rod (102) is U-shaped, with its top edge welded to the bottom surface of the horizontal embedded plate (101) and its leg edge embedded in the bottom plate (3) of the first basement level. The horizontal embedded plate (101) is exposed above the top surface of the bottom plate (3) of the first basement level.

7. The deep foundation bracing zoning and leaning beam construction in an open basement working condition according to claim 3, characterized in that: The reserved support beam (72) of the arrangement point (9) is connected to the connecting top steel plate (21) by the connector (20) anchored from the bottom surface, and the top surface of the replacement support beam (8) is fixedly connected to the bottom surface of the connecting top steel plate (21).

8. The deep foundation bracing zoning and leaning beam construction for open basement working condition according to claim 7, characterized in that: The connector (20) is a chemical bolt.

9. The deep foundation bracing zoning and leaning beam construction for open basement working condition, according to claim 1, characterized in that: The replacement support beam (8) is made of I-beams, and its slope range is 45 degrees to 60 degrees.

10. The deep excavation interior bracing zoned counterforted beam construction for unenclosed basement working conditions of claim 1, wherein: The foundation pit retaining structure (1) includes interlocking inner support piles (11) and outer waterproof piles (12), the waler (5) is fixedly connected to the inner side of the support piles (11), and the reserved support beam (72) is connected to the waler (5).

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