Deep foundation trench backfill anti-settling structure

Abstract

The utility model discloses a kind of deep foundation pit fertilizer groove backfilling anti-settling structures, it is related to fertilizer groove backfilling construction technology field, including: basement outer wall and basement roof water face pasting has continuous waterproof layer, waterproof layer outside is equipped with corresponding roof waterproof protective layer and outer wall waterproof protective layer, crown beam top surface is equipped with with the roof waterproof protective layer same height's brick masonry guide wall, outer wall waterproof protective layer, support pile, crown beam and the narrow space enclosed by brick masonry guide wall fill fertilizer groove backfilling material in, roof waterproof protective layer and brick masonry guide wall top surface are equipped with horizontally distributed reinforcing plate, by masonry mortar pasting fixed, directly above greening and paving etc. Load is directly transmitted to underground structure and foundation pit support, not affected by fertilizer groove backfilling material settlement. The utility model saves material and is environmental protection, and anti-settling effect is remarkable.

Description

Technical Field

[0001] This utility model relates to the field of backfilling construction technology for deep foundation pits, and more specifically, discloses a structure for preventing settlement during backfilling of deep foundation pits. Background Technology

[0002] During the construction of deep foundation pits, in order to meet the operational space requirements for the installation and removal of underground structure formwork, waterproofing, and protective layers, the operational space reserved between the basement exterior wall and the foundation pit support is called the backfill trench. The quality of the backfill trench directly affects the subsequent greening and paving effect of the outdoor landscaping, and its importance is self-evident, so it must be carefully controlled.

[0003] In existing technologies, considering the limited space in deep foundation pits, large compaction machinery cannot enter for construction. The traditional backfilling process for foundation pits uses layered soil laying combined with manual compaction using a frog-type rammer. This method is suitable for working in narrow spaces, but its drawback is that the compaction effect of the frog-type rammer is limited, and the compaction coefficient is difficult to meet the design requirements. At the same time, there is also a method of backfilling foundation pits using a new type of fluidized solidified soil. This method uses ordinary soil as the basic raw material and adds solidifying agents, water and other additives in a certain proportion. After thorough mixing, it forms a mixture with self-compacting properties. Relying on its own gravity, it flows and fills foundation pits of various complex shapes. Although the backfilling effect is better than the traditional backfilling method, uneven settlement still exists in the later stage, affecting the greening and paving effect above the backfilled area.

[0004] Therefore, how to solve the common quality problem of uneven settlement in the backfill area of ​​deep foundation pits in the existing technology has become an important technical problem to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this utility model is to optimize a deep foundation pit backfill anti-settlement structure to address the aforementioned shortcomings, thereby solving the construction problem of uneven settlement easily occurring in the backfill area of ​​deep foundation pits in the prior art. Its advantages are: the reinforcing plate is made in batches using scrap concrete and scrap steel, which is flexible in production, material-saving and environmentally friendly; the upper loads such as greening and paving are directly transferred to the underground structures and foundation pit support on both sides through the reinforcing plate, and are not affected by the later settlement of the backfill material, thus eliminating uneven settlement in the greening and paving areas and ensuring the quality of outdoor landscaping construction.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a deep foundation pit backfill anti-settlement structure, including a basement exterior wall and a basement roof slab. The basement exterior wall is vertically and continuously distributed, and the basement roof slab is horizontally distributed. The two are perpendicular to each other and belong to the same underground structure, and are cast in place with concrete to form a whole. The water-facing surface is fully covered with a waterproof layer, which is continuously distributed and firmly and tightly bonded to the basement exterior wall and the basement roof slab. The surface of the vertically distributed waterproof layer is provided with an exterior wall waterproof protective layer, and the surface of the horizontally distributed waterproof layer is provided with a roof slab waterproof protective layer. The side of the roof slab waterproof protective layer is flush with the outer side of the exterior wall waterproof protective layer and is corner-covering.

[0007] A number of support piles arranged in a line are provided on one side of the exterior wall waterproof protective layer. The top of the support piles is connected to a capping beam. The width of the capping beam is not less than that of the support piles, the center of which coincides with the center of the support piles, and the length of which is the same as that of the support piles, connecting the support piles into a whole. A brick guide wall is provided on the side of the top of the capping beam near the exterior wall of the basement. The side of the brick guide wall near the exterior wall of the basement is flush with the inner side of the capping beam, and the height is the same as the top surface of the roof waterproof protective layer. The narrow space enclosed by the exterior wall waterproof protective layer, the support piles, the capping beam, and the brick guide wall is filled with fertilizer trench backfill material.

[0008] The top waterproof protective layer of the top slab and the top surface of the brick guide wall are reinforced with mortar. The reinforced plate is set horizontally, with one side flush with the outer side of the brick guide wall and the other side overlapping the top waterproof protective layer. The bottom surface can be tightly attached to the backfill material of the deep foundation pit or a gap can be left. With this setting, even if the backfill material of the deep foundation pit settles later, it will not affect the elevation of the reinforced plate, thereby achieving the effect of preventing settlement of deep foundation pit backfill.

[0009] Furthermore, both the basement exterior walls and the basement roof are made of waterproof concrete with a seepage resistance grade of not less than P6.

[0010] Furthermore, the waterproof layer is made of coating or roll material, with a thickness of 1.5-4mm.

[0011] Furthermore, the distance between the external wall waterproof protective layer and the support pile is in the range of 1000-1200mm.

[0012] Furthermore, the brick guide wall is 240mm wide and is constructed using solid concrete bricks and Mb7.5 cement mortar.

[0013] Furthermore, the materials used for the backfill material in the fertilizer trench include various types such as earth and yellow sand, and the compaction coefficient is generally not less than 0.94.

[0014] Furthermore, the reinforcing plate is manufactured in two ways: cast-in-place and precast. The length is determined comprehensively based on the manufacturing method and segmentation scheme, with a width of 1600-1800mm and a thickness of 150mm. It is reinforced with double-layer bidirectional steel bars with a diameter of 16-18mm and a spacing of 150mm, and is cast with C35 concrete.

[0015] Furthermore, the overlap width between the reinforcing plate and the waterproof protective layer of the top plate and the brick guide wall on both sides along the length direction is 240-300mm.

[0016] The beneficial effects of this utility model are as follows: The deep foundation pit backfill anti-settlement structure of this utility model features a brick guide wall on the top surface of the capping beam of the foundation pit support, which is the same height as the waterproof protective layer of the top slab. Horizontally distributed reinforcing plates are attached to the brick guide wall and the top surface of the waterproof protective layer of the top slab. The loads from the greening and paving directly above are directly transferred to the underground structure and foundation pit support. The subsequent greening and paving effects are not affected by the settlement of the backfill material, resulting in good anti-settlement performance. Furthermore, the reinforcing plates can be made from scrap concrete and steel bars, making them readily available, material-saving, and environmentally friendly. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the deep foundation pit backfill anti-settlement structure in the embodiments of this application.

[0018] Figure 1 The components are as follows: 1. Roof slab waterproof protective layer; 2. Waterproof layer; 3. Masonry mortar; 4. Reinforcing plate; 5. Brick guide wall; 6. Basement roof slab; 7. Basement exterior wall; 8. Exterior wall waterproof protective layer; 9. Backfill material for the trench; 10. Crown beam; 11. Support piles. Detailed Implementation

[0019] The basement exterior walls 7 are vertically and continuously distributed, while the basement roof slab 6 is horizontally distributed. The two are perpendicular to each other and belong to the underground structure. They are cast in place as a whole using waterproof concrete with a seepage resistance grade of not less than P6. The water-facing surface is fully covered with a waterproof layer 2, which is continuously distributed and made of paint or roll material with a thickness of 1.5-4mm. It is firmly and tightly bonded to the basement exterior walls 7 and the basement roof slab 6. The surface of the vertically distributed waterproof layer 2 is covered with an exterior wall waterproof protective layer 8, and the surface of the horizontally distributed waterproof layer 2 is covered with a roof slab waterproof protective layer 1. The side of the roof slab waterproof protective layer 1 is flush with the outer side of the exterior wall waterproof protective layer 8 and is corner-wrapped.

[0020] A number of support piles 11 arranged in a line are provided on one side of the exterior wall waterproof protective layer 8, with a distance of 1000-1200mm between each support pile 11. The top of the support pile 11 is connected to a capping beam 10. The width of the capping beam 10 is not less than that of the support pile 11, the center of which coincides with the center of the support pile 11, and the length of which is the same as that of the support pile 11, connecting the support piles 11 into a whole. On the side of the top of the capping beam 10 near the basement exterior wall 7, there is a brick guide wall 5. The brick guide wall 5 is 240mm wide and is constructed of solid concrete bricks and Mb7.5 cement mortar. The side of the guide wall 5 near the basement exterior wall 7 is flush with the inner side of the capping beam 10, and the height is the same as the top surface of the roof waterproof protective layer 1. The narrow space enclosed by the exterior wall waterproof protective layer 8, support piles 11, capping beam 10 and brick guide wall 5 is filled with backfill material 9. The backfill material 9 is made of various materials such as soil and yellow sand, and the compaction coefficient is generally not less than 0.94.

[0021] The top surface of the waterproof protective layer 1 and the brick guide wall 5 is covered with a reinforcing plate 4 by masonry mortar 3. The reinforcing plate 4 is made in two ways: cast-in-place and precast. The length is determined by the manufacturing method and the segmentation plan. It is 1600-1800mm wide and 150mm thick. It is reinforced with double-layer bidirectional steel bars with a diameter of 16-18mm and a spacing of 150mm. It is poured with C35 concrete. The reinforcing plate 4 is set horizontally. One side is flush with the outer side of the brick guide wall 5, and the other side overlaps with the waterproof protective layer 1 of the top slab. The overlap width is 240-300mm. The bottom surface can be tightly attached to the backfill material 9 of the trough or there can be a gap. With this setting, even if the backfill material 9 of the trough settles later, it will not affect the elevation of the reinforcing plate 4, and the anti-settlement effect is significant.

[0022] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model; therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A deep foundation pit backfilling and anti-settlement structure, characterized in that: A continuous waterproof layer (2) is pasted on the water-facing side of the basement exterior wall (7) and the basement roof slab (6). A corresponding roof slab waterproof protective layer (1) and exterior wall waterproof protective layer (8) are provided on the outside of the waterproof layer (2). A brick guide wall (5) of the same height as the roof slab waterproof protective layer (1) is provided on the top surface of the capping beam (10). The narrow space enclosed by the exterior wall waterproof protective layer (8), the support pile (11), the capping beam (10) and the brick guide wall (5) is filled with backfill material (9). A horizontally distributed reinforcing plate (4) is pasted between the roof slab waterproof protective layer (1) and the brick guide wall (5) through masonry mortar (3). The greening and paving loads directly above the reinforcing plate (4) are directly transferred to the underground structure and foundation pit support, and are not affected by the settlement of the backfill material (9).

2. The deep foundation pit backfill anti-settlement structure according to claim 1, characterized in that: The brick guide wall (5) is 240mm wide and is constructed using solid concrete bricks and Mb7.5 cement mortar.

3. The deep foundation pit backfill anti-settlement structure according to claim 1, characterized in that: The reinforcing plate (4) is made in two ways: cast-in-place and precast. It is 1600-1800mm wide and 150mm thick, with double-layer bidirectional steel bars inside. The steel bars are 16-18mm in diameter and 150mm apart. It is made of C35 concrete.

4. The deep foundation pit backfill anti-settlement structure according to claim 1, characterized in that: The overlap width between the reinforcing plate (4) and the waterproof protective layer (1) of the top plate and the brick guide wall (5) along the length direction is 240-300mm.

Images