A structure and method for early backfilling of a fat trench in top-down construction

Abstract

This invention discloses a structure and method for early backfilling of excavation trenches using the reverse construction method. The structure includes an upper rib wall fixing structure. An upper rib wall is provided between the foundation pit retaining structure and the basement exterior wall on the upper rib wall fixing structure. A hidden beam is fixedly installed on the surface of the upper rib wall. Simultaneously, a connecting plate is located at the bottom of the upper rib wall, and the end of the connecting plate is fixedly connected to a wainscoting beam. The bottom of the wainscoting beam is supported by a lower diagonal brace. This invention, by setting an upper rib wall and a lower diagonal brace between the basement exterior wall and the foundation pit retaining structure, allows the connecting plate, wainscoting beam, basement exterior wall, upper rib wall, and lower diagonal brace to form a load-bearing system. This system allows the gravity load of the backfill soil to be transferred to the foundation pit retaining structure, thereby achieving early backfilling of the excavation trench.

Description

Technical Field

[0001] This invention belongs to the field of construction, specifically relating to a structure and method for pre-filling of trenches in reverse construction. Background Technology

[0002] When constructing a basement using the reverse construction method, the piles and columns are built first, followed by the construction of beams and slabs for each floor from top to bottom. The beam and slab structures are connected to the retaining structure via connecting plates, working together with the retaining structure to resist earth pressure. The soil in the foundation pit is excavated from top to bottom as construction progresses. After the foundation slab is completed, the exterior walls and waterproofing for each floor are completed from bottom to top, and then the foundation pit is backfilled.

[0003] Since outdoor pipelines may be located inside the trench, and outdoor roads may be located on top of the trench, the trench must be backfilled before constructing these outdoor pipelines and roads. However, in the conventional reverse construction method, the trench backfilling must be carried out after all the exterior walls and waterproofing work is completed. This means that if the exterior wall construction of some floors in the basement is not completed, the trench cannot be backfilled in advance, which will cause delays in the overall construction progress of outdoor pipelines, outdoor roads, and other outdoor structures. Summary of the Invention

[0004] The purpose of this invention is to overcome the defects mentioned in the background art. By setting an upper rib wall and a lower diagonal brace between the B1 outer wall and the waterproof and foundation pit retaining structure, the second connecting plate, the waist beam, the B1 outer wall and waterproof, the upper rib wall and the lower diagonal brace together form a force-bearing system. This system can transfer the gravity load of the backfill soil to the foundation pit retaining structure, thereby realizing the early backfilling of the foundation pit.

[0005] To achieve the above objectives, in a first aspect, the present invention provides a structure for pre-filling of a backfill trench in the reverse construction method, comprising an upper rib wall fixing structure. An upper rib wall is provided between the foundation pit retaining structure and the B1 outer wall and waterproofing on the upper rib wall fixing structure. A hidden beam is fixedly installed on the surface of the upper rib wall. Simultaneously, a connecting plate is located at the bottom of the upper rib wall, and the end of a second connecting plate is fixedly connected to a waist beam. The bottom of the waist beam is supported by a lower diagonal brace. The foundation pit retaining structure, steel columns, and engineering piles are installed on the construction foundation pit. The surface of the first layer of soil is covered with a first connecting plate, which is installed together with the basement roof slab. The end of the first connecting plate is a first waist beam. The surface of the second layer of soil is covered with a second connecting plate, which is installed together with the basement B1 slab. The end of the second connecting plate is a second waist beam, and the bottom of the second waist beam is provided with a lower diagonal brace. A backfill trench is provided on the left side of the B1 outer wall and waterproofing.

[0006] Furthermore, the upper rib wall fixing structure includes a foundation pit retaining structure, a hidden beam, an outer wall (B1) and waterproofing, an upper rib wall, a second connecting plate, a waist beam and a lower diagonal brace, and the upper surfaces of the hidden beam and the upper rib wall are both inclined.

[0007] Furthermore, the cross-section of the lower diagonal brace is a right-angled triangle, and the bottom of the second connecting plate and the waist beam are supported by the lower diagonal brace.

[0008] Furthermore, a second layer of soil is provided at the bottom of the basement B1 slab, and the B1 exterior wall and waterproofing, as well as the basement B1 slab, are installed vertically.

[0009] Furthermore, the positions of the upper rib wall and the lower diagonal brace are set one-to-one with the B1 outer wall and the waterproof steel column, and a concrete backfill hole is opened on the second connecting plate, and a B2 trough is set at the bottom of the lower diagonal brace for pouring concrete.

[0010] Furthermore, a concrete conduit is installed in the concrete backfill hole, and the outside of the concrete conduit is filled with a backfill structure.

[0011] Furthermore, the basement roof slab is covered with a third layer of soil, and a B2 outer wall and waterproofing are installed inside the third layer of soil. At the same time, a B2 trough is opened on the left side of the B2 outer wall and waterproofing.

[0012] Secondly, the present invention provides a method for backfilling the pit in advance using the reverse construction method, comprising the following steps: (1) constructing the pit retaining structure, engineering piles and steel columns; (2) excavating the first layer of soil and constructing the first wainscoting, the first connecting plate and the basement roof slab; (3) excavating the second layer of soil and constructing the second wainscoting, the second connecting plate, the basement B1 slab, the upper rib wall and the lower diagonal brace; (4) installing a concrete duct in the concrete backfill hole and backfilling the pit above the B1 slab elevation; (5) excavating the third layer of soil and constructing the basement floor slab, the B2 exterior wall and waterproofing; (6) pouring the pit between the B2 exterior wall and the pit retaining structure through the concrete duct.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] The load-bearing system is composed of connecting plates, waist beams, B1 exterior walls and waterproofing, upper rib walls and lower diagonal braces. This system allows the gravity load of the backfill soil to be transferred to the foundation pit retaining structure, thus enabling early backfilling of the trench. It solves the problem that the trench cannot be backfilled in advance when the exterior wall construction of some basement floors is not completed, creating conditions for the early construction of outdoor pipelines and roads, reducing the construction period, and connecting the inside and outside of the foundation pit, making material transportation and stacking more convenient. Attached Figure Description

[0015] Figure 1 A schematic diagram of an embodiment of the present invention is provided;

[0016] Figure 2 for Figure 1 Schematic diagram of AA section in the middle;

[0017] Figure 3 A schematic diagram of the upper rib wall and the second connecting plate in one embodiment of the present invention;

[0018] Figure 4 for Figure 3 Schematic diagram of the BB cross section in the middle;

[0019] Figure 5 This is a schematic diagram of construction step A in one embodiment of the method of the present invention;

[0020] Figure 6 This is a schematic diagram of construction step B in one embodiment of the method of the present invention;

[0021] Figure 7 This is a schematic diagram of construction step C in one embodiment of the method of the present invention;

[0022] Figure 8 This is a schematic diagram of construction step D in one embodiment of the method of the present invention;

[0023] Figure 9 This is a schematic diagram of construction step E in one embodiment of the method of the present invention;

[0024] Figure 10 This is a schematic diagram of construction step F in one embodiment of the method of the present invention.

[0025] In the diagram: 1. Excavation pit retaining structure; 2. Hidden beam; 4. Upper rib wall; 7. Lower diagonal brace; 8. Upper rib wall fixing structure; 10. Steel column; 11. Engineering pile; 12. First wainscoting beam; 13. First connecting plate; 14. First layer of soil; 15. Basement roof slab; 16. B2 trench concrete pouring; 17. Concrete backfill hole; 18. Second connecting plate; 19. Second wainscoting beam; 21. Trench; 22. B1 exterior wall and waterproofing; 23. Basement B1 slab; 24. Second layer of soil; 25. Concrete guide pipe; 26. Trench backfilling structure; 27. B2 exterior wall and waterproofing; 28. Third layer of soil; 29. ​​B2 trench. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] like Figures 1-10As shown, one embodiment of the present invention for the pre-filling of the pit using the reverse construction method includes an upper rib wall fixing structure 8; an upper rib wall 4 is provided between the pit retaining structure 1 and the outer wall B1 and the waterproofing 22 on the upper rib wall fixing structure 8, and a hidden beam 2 is fixedly provided on the surface of the upper rib wall 4. At the same time, the bottom of the upper rib wall 4 is a second connecting plate 18, and the end of the second connecting plate 18 is fixedly connected to a second waist beam 19. The bottom of the second waist beam 19 is supported by a lower diagonal brace 7; the pit retaining structure 1, steel columns 10, and engineering piles 11 are set up. On the construction pit, the surface of the first layer of soil 14 is covered with the first connecting plate 13, and the first connecting plate 13 is installed together with the basement roof slab 15. At the same time, the end of the first connecting plate 13 is the first waist beam 12. The surface of the second layer of soil 24 is covered with the second connecting plate 18, and the second connecting plate 18 is installed together with the basement B1 slab 23. At the same time, the end of the second connecting plate 18 is the second waist beam 19, and the bottom of the second waist beam 19 is provided with a lower diagonal brace 7. Meanwhile, a trench 21 is provided on the left side of the B1 exterior wall and waterproof 22.

[0028] Working principle: By setting an upper rib wall 4 and a lower diagonal brace 7 between the B1 outer wall and waterproofing 22 and the foundation pit retaining structure 1, the second connecting plate 18, the second waist beam 19, the B1 outer wall and waterproofing 22, the upper rib wall 4 and the lower diagonal brace 7 together form a force-bearing system, which allows the gravity load of the backfill soil to be transferred to the foundation pit retaining structure 1 through this system, thereby realizing the early backfilling of the trench 21; solving the problem that the trench cannot be backfilled in advance when the construction of the outer walls of some basement floors is not completed, creating conditions for the early construction of outdoor pipelines and roads, reducing the construction period, and connecting the inside and outside of the foundation pit, making material transportation and stacking more convenient. Specifically, it includes a structural construction and a construction method.

[0029] As a preferred embodiment, the upper rib wall fixing structure 8 includes a foundation pit retaining structure 1, a hidden beam 2, an outer wall B1 and waterproofing 3, an upper rib wall 4, a second connecting plate 18, a second waist beam 19 and a lower diagonal brace 7, and the upper surfaces of the hidden beam 2 and the upper rib wall 4 are both inclined.

[0030] like Figures 1-2 As shown: The upper rib wall 4 is located between the foundation pit retaining structure 1 and the B1 outer wall and waterproofing 22 above the basement B1 slab 23, connecting the B1 outer wall and waterproofing 22 and the foundation pit retaining structure 1 together. On the one hand, it reduces the span of the B1 outer wall and waterproofing 22 and increases its ability to resist soil pressure; on the other hand, it strengthens the connection between the second connecting plate 18 and the foundation pit retaining structure 1, so that the second connecting plate 18 can withstand greater vertical loads.

[0031] As a preferred embodiment, the lower diagonal brace 7 has a right-angled triangle cross section, and the bottom of the second connecting plate 18 and the second waist beam 19 are supported by the lower diagonal brace 7.

[0032] like Figures 3-4 As shown: The lower diagonal brace 7 is located between the foundation pit retaining structure 1 and the second connecting plate 18 at the bottom of the basement B1 slab 23, which strengthens the connection between the second connecting plate 18 and the foundation pit retaining structure 1, so that the second connecting plate 18 can withstand a larger vertical load.

[0033] As a preferred embodiment, a second layer of soil 24 is provided at the bottom of the basement B1 slab 23, and the B1 exterior wall and waterproofing 22 and the basement B1 slab 23 are vertically arranged.

[0034] As a preferred embodiment, the positions of the upper rib wall 4 and the lower diagonal brace 7 are set one-to-one with the steel column 10 of the B1 outer wall and the waterproof 22, and a concrete backfill hole 17 is opened on the second connecting plate 18, and a B2 trough for pouring concrete 16 is set at the bottom of the lower diagonal brace 7.

[0035] In a preferred embodiment, a concrete conduit 25 is installed in the concrete backfill hole 17, and the outside of the concrete conduit 25 is filled with a backfill structure 26.

[0036] As a preferred embodiment, the basement roof slab 15 is covered with a third layer of soil 28, and a B2 outer wall and waterproofing 27 are provided inside the third layer of soil 28. At the same time, a B2 trough 29 is provided on the left side of the B2 outer wall and waterproofing 27.

[0037] The construction steps of one embodiment of the reverse construction method for pre-filling of fertilizer trenches are as follows:

[0038] Step A: As Figure 5 As shown: Construction pit retaining structure 1, engineering piles 11 and steel columns 10;

[0039] Step B: As Figure 6 As shown: the first layer of soil 14 is excavated, and the first wainscoting 12, the first connecting slab 13 and the basement roof slab 15 are constructed.

[0040] Step C: As Figure 7 As shown: the second layer of soil 24 is excavated, and the second waist beam 19, the second connecting plate 18, the basement B1 slab 23, the upper rib wall 4 and the lower diagonal brace 7 are constructed.

[0041] The positions of the upper rib wall 4 and the lower diagonal brace 7 correspond one-to-one with the positions of the main beams near the B1 exterior wall and waterproofing 22; concrete backfilling holes 17 are left on the second connecting plate 18; after the concrete strength of the basement B1 slab 23, upper rib wall 4 and lower diagonal brace 7 reaches the design strength, the B1 exterior wall and waterproofing 22 are constructed.

[0042] Step D: As Figure 8As shown: A concrete guide pipe 25 is installed in the concrete backfill hole 17, and the trench 21 above the B1 slab elevation is backfilled.

[0043] Step E: As Figure 9 As shown: the third layer of soil 28 is removed, and the basement floor slab, B2 exterior wall and waterproofing 27 are constructed;

[0044] Step F: As Figure 10 As shown: The trench 21 between the B2 outer wall and the foundation pit retaining structure 1 is poured through the concrete conduit 25.

[0045] The embodiments of the present invention have the following advantages:

[0046] 1. Backfilling of trench 21 in advance allows for the construction of outdoor pipelines and roads to be carried out ahead of schedule, thus achieving overall project timeline benefits;

[0047] 2. The backfilling of the trench 21 in advance connected the site outside and inside the foundation pit, avoiding the need to build a bridge connecting the edge of the foundation pit and the top slab of the basement 15, thus saving costs;

[0048] 3. Pre-filling of the fertilizer trench 21 makes material transportation more convenient, the storage area is larger, and it helps to improve construction efficiency.

[0049] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A structure for pre-filling fertilizer trenches in reverse-cropping method, characterized in that, The structure includes an upper rib wall fixing structure (8), on which an upper rib wall (4) is provided between the foundation pit retaining structure (1) and the B1 outer wall and waterproofing (22), and a hidden beam (2) is fixedly provided on the surface of the upper rib wall (4). At the same time, the bottom of the upper rib wall (4) is a second connecting plate (18), and the end of the second connecting plate (18) is fixedly connected to the second waist beam (19). The bottom of the second waist beam (19) is supported by a lower diagonal brace (7). The foundation pit retaining structure (1), steel column (10), and engineering pile (11) are set on the construction foundation pit. The surface of the first layer of soil (14) is covered with the first connecting plate (13), and the first connecting plate (13) is fixedly provided on the surface of the foundation pit. The slab (13) is installed together with the basement roof slab (15), and the end of the first connecting slab (13) is the first waist beam (12); the surface of the second soil layer (24) is covered with the second connecting slab (18), and the second connecting slab (18) is installed together with the basement B1 slab (23), and the end of the second connecting slab (18) is the second waist beam (19), and the bottom of the second waist beam (19) is provided with a lower diagonal brace (7), and a fertilizer trough (21) is provided on the left side of the B1 exterior wall and waterproofing (22); a concrete backfill hole (17) is opened on the second connecting slab (18), and the bottom of the lower diagonal brace (7) is provided with a B2 fertilizer trough for pouring concrete (16).

2. The structure for pre-filling of fertilizer trenches in reverse-cropping method according to claim 1, characterized in that, The upper rib wall fixing structure (8) includes a pit retaining structure (1), a hidden beam (2), an outer wall and waterproofing (22), an upper rib wall (4), a second connecting plate (18), a second waist beam (19), and a lower diagonal brace (7), and the upper surfaces of the hidden beam (2) and the upper rib wall (4) are both inclined.

3. The structure for pre-filling of fertilizer trenches in reverse-cropping method according to claim 1, characterized in that, The cross-section of the lower diagonal brace (7) is a right triangle.

4. The structure for pre-filling of fertilizer trenches in reverse-cropping method according to claim 1, characterized in that, The bottom of the second connecting plate (18) and the second waist beam (19) are supported by the lower diagonal brace (7).

5. The structure for pre-filling of fertilizer trenches in reverse-cropping method according to claim 1, characterized in that, The bottom of the basement B1 slab (23) is provided with a second layer of soil (24), and the B1 outer wall and waterproofing (22) and the basement B1 slab (23) are set vertically.

6. The structure for pre-filling of fertilizer trenches in reverse-cropping method according to claim 1, characterized in that, The positions of the upper rib wall (4) and the lower diagonal brace (7) are set one-to-one with the steel column (10) of the outer wall of B1 and the waterproof (22).

7. The structure for pre-filling of fertilizer trenches in reverse-cropping method according to claim 1, characterized in that, A concrete conduit (25) is installed in the concrete backfill hole (17).

8. The structure for pre-filling of fertilizer trenches in reverse-cropping method according to claim 7, characterized in that, The outside of the concrete conduit (25) is filled with a backfill structure (26).

9. The structure for pre-filling of fertilizer trenches in reverse-cropping method according to claim 1, characterized in that, The basement roof slab (15) is covered with a third layer of soil (28), and a B2 outer wall and waterproofing (27) are set inside the third layer of soil (28). Meanwhile, a B2 fertilizer trough (29) is opened on the left side of the B2 outer wall and waterproofing (27).

10. A method for pre-filling fertilizer trenches in reverse-cropping construction, employing the structure for pre-filling fertilizer trenches in reverse-cropping construction as described in claim 1, characterized in that, Includes the following steps: (1) Construction pit retaining structure (1), engineering piles (11) and steel columns (10); (2) Remove the first layer of soil (14) and construct the first waist beam (12), the first connecting plate (13) and the basement roof slab (15); (3) Remove the second layer of soil (24) and construct the second waist beam (19), the second connecting plate (18), the basement B1 slab (23), the upper rib wall (4) and the lower diagonal brace (7); (4) Install concrete guide pipe (25) in concrete backfill hole (17) and backfill the trough (21) above the B1 plate elevation; (5) Remove the third layer of soil (28), and construct the basement floor slab, B2 exterior wall and waterproofing (27); (6) The trench (21) between the B2 outer wall and the foundation pit retaining structure (1) is poured through the concrete conduit (25).

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