Underpinning structure for post-dismantling and supporting construction of main building area of deep foundation pit engineering
By setting up a round steel pipe with φ300×10 specification on the negative floor of the underground, the construction progress problem caused by the difficulty of earth transportation in the deep foundation pit project was solved, and the continuity and safety of the main building construction were achieved.
Patent Information
- Application Number
- CN202422354600.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-26
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-09-26
AI Technical Summary
In the existing deep foundation pit project, the earthwork cannot be transported in a short time, resulting in limited construction progress of the main building and some frame columns cannot be constructed, which poses construction risks and delays in construction periods.
The round steel pipe with φ300×10 specification is used as the support steel pipe. By setting up cross-support beams and steel columns on the bottom bottom layer of the underground, the support steel pipe is used to support the conflicting frame columns, and combining the structural design of concrete and steel bars to achieve load transfer.
During the difficult period of earthwork transportation, the construction progress of the main building was ensured, long-term stagnation was avoided, and the support of some main buildings with support beams was realized, meeting the project progress needs.
Smart Images
Figure CN223119077U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of foundation pit engineering, and particularly relates to a post-removal bracing construction and replacement structure for the main building area of a deep foundation pit project. Background Technique
[0002] Most of the deep foundation pit support designs are in the form of reinforced concrete support piles combined with a reinforced concrete support beam. This design requires overall large-scale excavation of the soil, simultaneous construction of the basements within the entire foundation pit, and the support beam can only be removed after the concrete strength of the replacement bracing blocks around the entire foundation pit reaches 80% at the specified replacement bracing positions, and then construction of the main body can continue upward. However, the soil disposal sites are few and remote, resulting in a large amount of soil in the deep foundation pit that cannot be excavated and transported out in a short time. All the main buildings in the pit cannot complete the replacement bracing work simultaneously and can only wait after being successively constructed to the replacement bracing positions at the second basement floor, with a long stagnation time and a great impact on the construction period.
[0003] If the planned progress requirements of some main building projects are ahead, on the premise that the support beam is not removed, the main structure can be constructed upward with the support beam, and the support beam covered by the main building will be removed as a whole later. When a horizontal support is designed, the top elevation of the horizontal support beam is generally between the ±0.00 roof slab and the second basement floor roof slab. After the main building structure is constructed to the first basement floor area, in the projection to some vertical members such as frame columns, there will be a situation where 1 / 4 of the edge part is blocked, and there is no blockage within 300 mm in the middle of the column. When implementing the post-removal bracing technology, there is a situation where some main body frame columns conflict with the position of the foundation pit support horizontal support beam, resulting in the inability to construct the frame columns in this part of the main building upward. If this part of the frame columns is left out, it will affect the transfer of the upper structure load and construction load, and there are relatively large construction risks. Summary of the Invention
[0004] In order to overcome the deficiencies of the prior art, the utility model provides a post-removal bracing construction and replacement structure for the main building area of a deep foundation pit project, which realizes the replacement of some main buildings with the support beam, and is beneficial to ensuring the project progress.
[0005] To achieve the above purpose, the post-removal bracing construction and replacement structure for the main building area of the deep foundation pit project of the utility model includes a basement roof slab and a second basement floor roof slab. The basement roof slab is arranged above the second basement floor roof slab. There are several intersecting support beams below the basement roof slab. Steel columns extending downward through the second basement floor roof slab are arranged at the connection nodes of the support beams. A replacement steel pipe parallel to the steel column is arranged at the bottom of the basement roof slab, and the top of the replacement steel pipe is arranged beside the connection node of the support beam.
[0006] Furthermore, the replacement steel pipe adopts a round steel pipe with a specification of φ300×10, and several stud bolts are respectively arranged at the top and bottom ends of the replacement steel pipe.
[0007] Further, the number of stud bolts at the top of the steel pipe for underpinning is six, and the six stud bolts are evenly distributed along the circumference at the top of the steel pipe for underpinning. The number of stud bolts at the bottom of the steel pipe for underpinning is six, and the six stud bolts are evenly distributed along the circumference at the bottom of the steel pipe for underpinning.
[0008] Further, the end of the stud bolt is exposed outside the steel pipe for underpinning, and the top of the stud bolt is bent outward.
[0009] Further, the inside of the steel pipe for underpinning is filled with concrete.
[0010] Further, steel bars are tied outside the steel pipe for underpinning, and a concrete column is cast outside the steel pipe for underpinning.
[0011] The post-removal bracing construction underpinning structure for the main building area of the deep foundation pit project of the present utility model realizes the underpinning of some main buildings with support beams by using steel columns to underpin the conflicting frame columns. During the period when it is difficult to transport the soil out, the overall construction progress of the project is not affected. Some main buildings do not need to wait stagnantly for a long time to complete the bracing replacement work simultaneously with other main buildings, and the planned construction period requirements are achieved in advance. Description of the Drawings
[0012] The present utility model will be further described and elaborated below in conjunction with the drawings.
[0013] Figure 1 is a schematic diagram of the post-removal bracing construction underpinning structure for the main building area of the deep foundation pit project of the preferred embodiment of the present utility model.
[0014] Figure 2 is a schematic diagram of the post-removal bracing construction underpinning structure for the main building area of the deep foundation pit project after removing the basement top slab.
[0015] Figure 3 is a cross-sectional view of the concrete column.
[0016] Figure 4 is a cross-sectional view of the steel pipe for underpinning.
[0017] Reference numerals: 1, basement top slab; 11, support beam; 12, steel column; 2, negative second floor top slab; 3, steel pipe for underpinning; 4, stud bolt; 5, steel bar; 6, concrete column. Detailed Embodiments
[0018] The technical solution of the present utility model will be more clearly and completely elaborated below by describing the preferred embodiments of the present utility model in conjunction with the drawings.
[0019] As Figure 1 and Figure 2As shown in the figure, the post-removal bracing construction and replacement structure for the main building area of the deep foundation pit project in the preferred embodiment of the present utility model includes a basement top slab 1 and a second basement top slab 2. The basement top slab 1 is arranged above the second basement top slab 2. A number of intersecting support beams 11 are provided below the basement top slab 1. Steel columns 12 extending downward through the second basement top slab 2 are provided at the connection nodes of the support beams 11.
[0020] As Figure 2 and Figure 3 As shown in the figure, a replacement steel pipe 3 parallel to the steel column 12 is provided at the bottom of the basement top slab 1. The top of the replacement steel pipe 3 is arranged beside the connection node of the support beam 11. Concrete is poured inside the replacement steel pipe 3. Reinforcement bars 5 are tied outside the replacement steel pipe 3. A concrete column 6 is poured outside the replacement steel pipe 3.
[0021] As Figure 3 and Figure 4 As shown in the figure, the replacement steel pipe 3 adopts a circular steel pipe with a specification of φ300×10. A number of stud bolts 4 are respectively provided at the top and bottom ends of the replacement steel pipe 3. The number of stud bolts 4 at the top end of the replacement steel pipe 3 is 6. The 6 stud bolts 4 are evenly distributed along the circumference of the top of the replacement steel pipe 3 at equal intervals. The number of stud bolts 4 at the bottom end of the replacement steel pipe 3 is 6. The 6 stud bolts 4 are evenly distributed along the circumference of the bottom of the replacement steel pipe 3 at equal intervals. The ends of the stud bolts 4 are exposed outside the replacement steel pipe 3. The tops of the stud bolts 4 are bent outward.
[0022] Specific implementation process: To ensure the effective force transmission path of the conflict columns and ensure the normal construction of the upper floors, the frame columns within this affected range are replaced by setting replacement steel pipes 3 in the middle. Some areas of the frame columns are affected, but the general axis positions are not affected. Therefore, replacement steel pipes 3 are set at the axis positions of such columns as temporary supports for the underground first basement floor. The column model of the replacement steel pipe 3 is φ300×10. Stud bolts 4 are welded on the surface. Concrete is poured into the replacement steel pipe 3 while pouring the underground first basement floor top slab to form a concrete-filled steel pipe column 6 to support the upper load. After the cross bracing of the foundation pit is removed, reinforcement bars 5 are tied around the replacement steel pipe 3, and then the concrete column 6 outside the column is poured. Through design calculation, this method can temporarily replace the formal frame columns to transfer the upper load.
[0023] The post-removal bracing construction and replacement structure for the main building area of the deep foundation pit project of the present utility model realizes the replacement of some main buildings with support beams by using steel columns to replace the conflict frame columns. During the period when it is difficult to transport the soil out, the overall construction progress of the project is not affected. Some main buildings do not need to wait stagnantly for a long time to complete the bracing replacement work with other main buildings at the same time, and the planned construction period requirements are achieved in advance.
[0024] The above specific embodiments only describe the preferred embodiments of the present invention, rather than limiting the protection scope of the present invention. Without departing from the design concept and spirit scope of the present invention, various deformations, substitutions and improvements made by those of ordinary skill in the art to the technical solutions of the present invention according to the written description and drawings provided by the present invention shall fall within the protection scope of the present invention. The protection scope of the present invention is determined by the claims.
Claims
1. A post-removal support construction and replacement structure for the main building area of a deep foundation pit project, characterized in that, It includes the basement top slab (1) and the second basement floor top slab (2). The basement top slab (1) is arranged above the second basement floor top slab (2). A number of intersecting support beams (11) are provided below the basement top slab (1). Steel columns (12) extending downward through the second basement floor top slab (2) are provided at the connection nodes of the support beams (11). A replacement steel pipe (3) parallel to the steel columns (12) is provided at the bottom of the basement top slab (1). The top of the replacement steel pipe (3) is arranged beside the connection node of the support beam (11).
2. The post-removal strut construction and replacement structure for the main building area of the deep foundation pit project according to claim 1, wherein The replacement steel pipe (3) is a circular steel pipe with a specification of φ300×10. A number of stud bolts (4) are respectively provided at the top and bottom ends of the replacement steel pipe (3).
3. The post-removal strut construction and replacement structure for the main building area of the deep foundation pit project according to claim 2, characterized in that, The number of stud bolts (4) at the top end of the replacement steel pipe (3) is 6. The 6 stud bolts (4) are evenly distributed at equal intervals along the circumference at the top of the replacement steel pipe (3). The number of stud bolts (4) at the bottom end of the replacement steel pipe (3) is 6. The 6 stud bolts (4) are evenly distributed at equal intervals along the circumference at the bottom of the replacement steel pipe (3).
4. The post-removal support construction and replacement structure in the main building area of the deep foundation pit project according to claim 3, characterized in that, The ends of the stud bolts (4) are exposed outside the replacement steel pipe (3), and the tops of the stud bolts (4) are bent outward.
5. The post-removal support construction and replacement structure for the main building area of the deep foundation pit project according to claim 4, characterized in that, Concrete is poured inside the replacement steel pipe (3).
6. The post-removal support construction and replacement structure for the main building area of the deep foundation pit project according to claim 1, characterized in that, Reinforcement bars (5) are tied outside the replacement steel pipe (3), and a concrete column (6) is poured outside the replacement steel pipe (3).