CN217580288U

CN217580288U - Low building foundation connection structure of basement roof is striden to back construction

Info

Publication number: CN217580288U
Application number: CN202221431301.6U
Authority: CN
Inventors: 彭宁; 程球
Original assignee: CITIC General Institute of Architectural Design and Research Co Ltd
Current assignee: CITIC General Institute of Architectural Design and Research Co Ltd
Priority date: 2022-06-09
Filing date: 2022-06-09
Publication date: 2022-10-14
Anticipated expiration: 2032-06-09

Abstract

The utility model relates to a short building foundation connection structure of basement roof is striden to back construction, and basement exterior wall edge sets up raft foundation, and raft foundation below is equipped with the plain concrete bed course that supports raft foundation, sets up layering compaction backfill below the plain concrete bed course, and in raft foundation's end muscle was planted basement exterior wall to set up the connection short reinforcement that shears at raft foundation middle part and basement exterior wall faying face. The utility model discloses a local raft after the ground is handled links to each other with adjacent basement roof or basement outer wall, has strengthened the wholeness of building the short building foundation of striding the basement roof after greatly, effectively prevents the ground fracture or the wall fracture that the inhomogeneous settlement produced, has good construction operability, economic nature, feature of environmental protection.

Description

Low building foundation connection structure of basement roof is striden to back construction

Technical Field

The utility model relates to a building engineering technical field especially relates to a low building foundation joint construction of basement roof is striden to back construction.

Background

In engineering practice, as urban functions are improved, low functional houses (such as police rooms, garbage houses, property houses, small power distribution rooms, small movable rooms, community service houses and the like) are newly added, the newly added low functional houses are flexible in site selection, and some buildings are arranged on the edge of an existing basement, half of the buildings are arranged on the top plate of the basement, and the other half of the buildings are arranged on backfill soil outside the basement. The buildings are usually based on the principle of light design (to avoid reinforcing the original basement structure due to insufficient bearing capacity caused by increased load), and steel frame structures are adopted in many cases. The basic design generally adopts two schemes according to basement roof earthing thickness: 1. when the edge of the basement top plate is covered with soil larger than 300mm, the edge top plate of the basement and the outside are filled with soil, and the building foundation is directly a raft foundation; 2. the earth covering of the top plate at the edge of the basement is less than 300mm (the old basement is more), the earth filling outside the basement is processed, the frame column foundation falling outside adopts a column base or a strip base, and the steel column falling on the top plate of the basement is fixed on the top plate. Through analysis, the first condition is conventional design, the inner partition wall and the outer partition wall can be made of brickworks, and when the raft foundation is adopted, the settlement difference between the filling soil on the top plate and the filling soil outside the basement is adjusted, so that the engineering quality is easy to guarantee. In the second situation, the top plate is not filled with backfill, the thickness is not enough when the integral raft is adopted (the indoor elevation cannot be lifted easily), the backfill around the basement is usually arranged on the inner side of the basement excavation support, and the filling depth is deep. If the earth filling treatment of the basement-crossing building is improper, the building is easy to incline and crack (partition walls of the inner and outer brickwork are easy to crack) due to uneven foundation settlement. At the moment, a low building foundation and a connection method aiming at a top plate of a post-construction cross basement need to be considered, so that the quality defect of the building caused by uneven settlement is avoided.

Disclosure of Invention

In order to fill in the vacancy of standard and atlas to this kind of short building foundation connection way of striding the basement roof of back construction, the utility model provides a short building foundation joint construction of striding the basement roof is built to back to the above-mentioned problem, can strengthen the wholeness of building the short building foundation of striding the basement roof after, effectively prevent the ground fracture or the wall fracture that the differential settlement produced, have good construction operability, economic nature, feature of environmental protection.

The utility model provides a technical scheme is: a raft foundation is arranged at the edge of an underground outdoor wall, a plain concrete cushion layer for supporting the raft foundation is arranged below the raft foundation, layered compacted backfill is arranged below the plain concrete cushion layer, bottom ribs of the raft foundation are implanted into the underground outdoor wall, and shear connection short steel bars are arranged on the junction surface of the middle of the raft foundation and the basement outer wall.

The surface elevation of the raft foundation is higher than the elevation of the surface of the top plate of the adjacent basement, the height difference delta h between the surface elevation of the raft foundation and the elevation of the surface elevation of the top plate of the adjacent basement meets the condition that the height is not less than 100mm and is less than 300mm, the top plate of the basement is provided with a double-layer reinforcement surface layer, and the surface reinforcing steel bars of the raft foundation and the reinforcing steel bars of the double-layer reinforcement surface layer are connected in a pulling way or in a pulling lap joint.

Or the surface elevation of the raft foundation is higher than the surface elevation of the top plate of the adjacent basement, the height difference delta h between the surface elevation of the raft foundation and the surface elevation of the top plate of the adjacent basement meets the condition that the height is not less than 50mm and is less than 100mm, a single-layer reinforcement surface layer is arranged on the top plate of the basement, and the surface reinforcing steel bars of the raft foundation and the reinforcing steel bars of the single-layer reinforcement surface layer are connected in a pulling-through mode or in a pulling-lap joint mode.

Or the surface elevation of the raft foundation is lower than the top plate of the basement, the gluten of the raft foundation is implanted into the underground outdoor wall, and the joint surface of the basement outer wall and the raft foundation is provided with the slow-expansion water stop strip capable of expanding when encountering water.

The thickness of each layer of the layered compacted backfill soil is not more than 300mm, and the compaction coefficient is not less than 0.94.

For the part of the low building located on the filling outside the basement roof, the utility model carries out proper foundation treatment (such as layered backfill tamping or replacement filling mode) on the filling in the relevant range, and adopts a raft foundation after the filling has certain bearing capacity, and the raft foundation is provided with an embedded part with an upper steel structure; the part of low building on the basement roof, the steel construction is direct to be connected on the roof through crab-bolt and anchor slab, according to raft foundation surface and the elevation relation of former basement roof face down, can set up double-deck arrangement of reinforcement rigidity terrace, individual layer arrangement of reinforcement surface course or raft reinforcing bar three kinds of modes of implanting in the basement outer wall on the basement roof.

The utility model has the advantages that: local raft after handling through the ground links to each other with adjacent basement roof or basement outer wall, has strengthened the wholeness of building the short building foundation of striding the basement roof after the back greatly, effectively prevents the ground fracture or the wall fracture that differential settlement produced, has good construction operability, economic nature, feature of environmental protection.

Drawings

FIG. 1 shows the connection structure of raft foundation higher than the top plate of the original basement (100 mm. DELTA.h ≦ 300 mm).

FIG. 2 is a connection structure of raft foundation surface elevation slightly higher than the adjacent original basement roof (Δ h is greater than or equal to 50mm and less than 100 mm).

Fig. 3 is a connection structure when the elevation of the raft foundation surface is lower than the top plate of the adjacent original basement.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments.

In the figure 1, the elevation BG-1 of the A surface of the raft foundation is higher than the elevation BG-2 of the top plate of the adjacent in-situ lower chamber, and delta h is more than or equal to 100mm and less than 300mm, appropriate foundation treatment is carried out on filling soil in the relevant range of a later-built building, after the filling soil has certain bearing capacity, the raft foundation is adopted, and a double-layer bidirectional reinforcement surface layer (rigid terrace) C is arranged on the top plate of the basement. Raft foundation gluten 1 and rigidity terrace C's gluten 2 overlap joint each other according to pulling, and raft foundation base muscle 3 is planted in basement keeps off the soil outer wall, and the bar planting degree of depth d is confirmed according to the calculation (same down). Chiseling the junction of the basement outer wall B and the raft foundation A, arranging 1~2 rows of shear-resistant short steel bars 4, implanting one end into the basement outer wall B, and extending one end into the raft foundation A to enhance the shear-resistant bearing capacity and integrity of the connection part.

In the figure 2, the elevation BG-1 of the A surface of the raft foundation is higher than the elevation BG-2 of the top plate surface of the adjacent in-situ lower chamber, delta h is more than or equal to 50mm and less than 100mm, the foundation treatment and raft foundation are arranged in the same figure 1, and a single-layer bidirectional reinforcement surface layer C is arranged on the top plate of the basement. The raft foundation gluten 1 and the plate surface steel bar 5 of the reinforcement surface layer C are mutually lapped according to tension, and the raft foundation bottom steel bar 3 is implanted into the basement earth-retaining outer wall B. Chiseling the junction of the basement outer wall and the raft foundation A, and arranging 1~2 rows of shear-resistant short steel bars 4 in the same way as the method in the figure 1;

in fig. 3, when elevation BG-1 of raft foundation a surface is lower than adjacent original basement roof BG-2, local foundation treatment is the same as that in fig. 1, raft foundation gluten 1 and bottom ribs 3 are both implanted into basement earth-retaining outer wall B, chiseling treatment is performed on the junction of basement outer wall B and raft, shear-resistant short steel bars 4 are implanted in 1~2 rows, and shear-resistant bearing capacity and integrity of the connection part are enhanced. When waterproof requirement exists, the joint surface of the basement outer wall B and the raft foundation A is additionally provided with the slowly-expanding water-swelling sealing strip 6, so that the problems of water seepage and water leakage are effectively prevented.

In fig. 1, 2 and 3, 7 represents layered compacted backfill soil, the thickness of each layer is not more than 300mm, and the compaction coefficient is not less than 0.94; and 8 denotes a 100mm thick plain concrete cushion.

Claims

1. The utility model provides a short building foundation connection structure of basement roof is striden to back construction, characterized by: the edge of the underground outdoor wall is provided with a raft foundation, a plain concrete cushion layer for supporting the raft foundation is arranged below the raft foundation, layered compacted backfill is arranged below the plain concrete cushion layer, bottom ribs of the raft foundation are implanted into the underground outdoor wall, and shear connection short reinforcing steel bars are arranged on the junction surface of the middle part of the raft foundation and the outer wall of the basement.

2. The post-construction basement roof low building foundation connection structure of claim 1, wherein: the surface elevation of the raft foundation is higher than the elevation of the surface of the top plate of the adjacent basement, the height difference delta h between the surface elevation of the raft foundation and the elevation of the surface elevation of the top plate of the adjacent basement meets the condition that the height is not less than 100mm and is less than 300mm, the top plate of the basement is provided with a double-layer reinforcement surface layer, and the surface reinforcing steel bars of the raft foundation and the reinforcing steel bars of the double-layer reinforcement surface layer are connected in a pulling way or in a pulling lap joint.

3. The post-construction basement roof low building foundation connection structure of claim 1, wherein: the surface elevation of the raft foundation is higher than the elevation of the surface of the top plate of the adjacent basement, the height difference delta h between the surface elevation of the raft foundation and the elevation of the surface elevation of the top plate of the adjacent basement meets the condition that the height is not less than 50mm and is less than 100mm, a single-layer reinforcement surface layer is arranged on the top plate of the basement, and surface reinforcing steel bars of the raft foundation and reinforcing steel bars of the single-layer reinforcement surface layer are connected in a pulling way or are in a pulling lap joint.

4. The post-construction basement roof low building foundation connection structure of claim 1, wherein: the surface elevation of the raft foundation is lower than the top plate of the basement, gluten of the raft foundation is implanted into the underground outdoor wall, and the joint surface of the basement outer wall and the raft foundation is provided with a slow-expansion water-swelling water stop strip.

5. The low building foundation connecting structure of the post-built across the basement roof as claimed in claim 1, 2, 3 or 4, wherein: the thickness of each layer of the layered compacted backfill soil is not more than 300mm, and the compaction coefficient is not less than 0.94.