Construction structure for expanding underground space of existing building by changing pile into column
By setting up anchor steel and T-shaped steel component hoops in construction, the problem of lateral cracks and planting tendons in the original pile foundation are solved, and groundwater seepage is prevented by the setting of expansion water stop bars, which improves the safety and service life of the building structure.
Patent Information
- Application Number
- CN202421825738.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-30
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-07-30
AI Technical Summary
In existing construction, the supporting frame columns are prone to lateral cracks and planting tendons of the original pile foundation support and the problem of not being easy to implant when expanding the underground space. The construction joints between the newly added pile foundation support and the supporting frame column are prone to seepage, which affects the structural stability and service life.
By setting up anchorage steel between the in-situ beam and the original pile foundation support platform, the connection strength is enhanced; T-shaped steel component hoops and expansion water stop strips are set up between the newly added pile foundation support platform and the support frame column to improve the connection strength and prevent groundwater from infiltration.
The stable connection between the in-situ beam-to-frame beam and the original pile foundation bearing is achieved, the safety and service life of the building structure are improved, and the service life of the structure is extended by the setting of the expansion water stop bar.
Smart Images
Figure CN222908884U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of building construction, and in particular to a construction structure for expanding the underground space of an existing building by changing piles into columns. Background Technique
[0002] At a building construction site, a supporting frame column needs to be installed below the main building frame column. There is an original pile foundation cap at the connection between the supporting frame column and the main building frame column, and the original pile foundation cap is connected to a horizontally arranged original ground beam. The frame column longitudinal bars in the supporting frame column are anchored into the original pile foundation cap, and the supporting longitudinal bars in the original ground beam are anchored into the original pile foundation cap.
[0003] When it is necessary to build an underground space, a new pile foundation cap for supporting the underground building structure needs to be set on the supporting frame column. The new pile foundation cap and the supporting frame column are connected by roughening the surface and relying on the self - characteristics of concrete to connect with the supporting frame column.
[0004] Regarding the above - mentioned related technology, the inventor believes that during the use of the above - mentioned supporting frame column, since there are horizontally arranged supporting longitudinal bars and vertically arranged frame column longitudinal bars anchored in the original pile foundation cap, it is easy to cause a large number of rebar planting holes to appear in the same cross - section of the original pile foundation cap, thus easily generating through - horizontal cracks during use, which will affect the structural safety of the building. Moreover, a large number of rebar planting projects are likely to lead to difficult implantation of the rebars. In addition, since the new pile foundation cap and the supporting frame column are connected by roughening the surface, construction joints are likely to occur between them. And the new pile foundation cap is located underground. When the groundwater level rises, groundwater will seep into the construction joints, affecting the stability and service life of the structure. Content of the Utility Model
[0005] In order to improve the service safety and service life of the building structure when expanding the underground space of an existing building, the present application provides a construction structure for expanding the underground space of an existing building by changing piles into columns.
[0006] The construction structure for expanding the underground space of an existing building by changing piles into columns provided by the present application adopts the following technical solutions:
[0007] A construction structure for expanding the underground space of an existing building by changing piles into columns includes a supporting frame column, a main building frame column, an original pile foundation cap, and a new pile foundation cap. The main building frame column is connected to the top surface of the original pile foundation cap, the supporting frame column is connected to the bottom surface of the original pile foundation cap, the new pile foundation cap is connected to the supporting frame column, and further includes an original ground beam changed into a frame beam horizontally installed on the original pile foundation cap. The top surface of the original ground beam changed into a frame beam is higher than the top surface of the original pile foundation cap. Anchor - type steel is provided on the original pile foundation cap, and the opposite ends of the anchor - type steel are respectively connected to the original ground beam changed into a frame beam and the main building frame column.
[0008] By adopting the above technical solution, the steel section for anchoring is connected between the original ground beam converted into a frame beam and the original pile foundation cap, which helps to improve the connection strength between the two. Through the mutual cooperation of the supporting frame column, the main building frame column, the original pile foundation cap, the newly added pile foundation cap, the original ground beam converted into a frame beam, and the steel section for anchoring, a stable connection between the original ground beam converted into a frame beam and the original pile foundation cap is achieved, having the effect of improving the service safety and service life of the building structure when expanding the underground space of the existing building.
[0009] Optionally, the newly added pile foundation cap is provided with newly added cap longitudinal bars and newly added cap stirrups. The outer wall of the supporting frame column is circumferentially provided with a T-shaped steel member hoop. Two T-shaped steel member hoops are arranged in parallel, and the T-shaped steel member hoop is connected to the newly added cap longitudinal bars.
[0010] By adopting the above technical solution, the T-shaped steel member hoop is connected to the supporting frame column, and the newly added longitudinal bars and the newly added cap stirrups support the newly added pile foundation cap, improving the connection strength and connection stability between the newly added pile foundation cap and the supporting frame.
[0011] Optionally, a closed concrete block is provided on the original pile foundation cap. A closed frame is arranged in the closed concrete block. The closed frame includes closed stirrups and closed longitudinal bars.
[0012] By adopting the above technical solution, the closed concrete block protects the steel section for anchoring, preventing the steel section for anchoring from being directly exposed on the ground and damaged. The arrangement of the closed frame improves the structural strength and service life of the closed concrete block.
[0013] Optionally, an expansion water stop strip is circumferentially arranged on the outer wall of the supporting frame column. The expansion water stop strip is arranged between two T-shaped steel member hoops.
[0014] By adopting the above technical solution, the expansion water stop strip is arranged in the construction joint between the supporting frame column and the newly added pile foundation cap. When groundwater seeps upward along the construction joint, the groundwater contacts the expansion water stop strip. The expansion water stop strip swells when encountering water and fills the inside of the construction joint, preventing the groundwater from further seeping upward, which helps to extend the service life of the structure.
[0015] Optionally, two expansion water stop strips are arranged in parallel.
[0016] By adopting the above technical solution, the arrangement of the two expansion water stop strips improves the degree of anti-seepage of groundwater, which helps to extend the service life of the overall structure.
[0017] Optionally, a concrete cushion layer is horizontally provided on the bottom surface of the newly added pile foundation cap and on the outer peripheral wall of the newly added pile foundation cap. A brick formwork for the pile foundation cap is provided on the outer peripheral wall of the newly added pile foundation cap, and two opposite sides of the brick formwork for the pile foundation cap are respectively connected to the two concrete cushion layers.
[0018] By adopting the above technical solution, the two concrete cushion layers and the brick formwork for the pile foundation cap protect against groundwater, reducing the possibility of groundwater seeping into the construction joint between the newly added pile foundation cap and the supporting frame column.
[0019] Optionally, a waterproof board is provided on the top surface of the upper concrete cushion layer, and the top surface of the waterproof board is flush with the top surface of the newly added pile foundation cap.
[0020] By adopting the above technical solution, the waterproof board protects against groundwater, reducing the possibility of groundwater seeping into the underground space of the building and helping to improve the strength of the overall structure.
[0021] Optionally, the bottom end of the closed longitudinal reinforcement is anchored in the original pile foundation cap. Frame beam longitudinal reinforcement is provided in the original ground beam converted into a frame beam, and the frame beam longitudinal reinforcement is connected to the steel section for anchoring.
[0022] By adopting the above technical solution, the frame beam longitudinal reinforcement and the closed longitudinal reinforcement are anchored in the original pile foundation cap, improving the connection strength between the closed concrete block and the original ground beam converted into a frame beam and the original pile foundation cap.
[0023] In summary, the present application includes at least one of the following beneficial technical effects:
[0024] 1. Through the mutual cooperation of the supporting frame column, the main building frame column, the original pile foundation cap, the newly added pile foundation cap, the original ground beam converted into a frame beam, and the steel section for anchoring, a stable connection between the original ground beam converted into a frame beam and the original pile foundation cap is achieved, having the effect of improving the service safety and service life of the building structure when expanding the underground space of the existing building;
[0025] 2. The setting of the expansion waterstop strip prevents further upward seepage of groundwater, helping to extend the service life of the structure;
[0026] 3. The setting of the T-shaped steel member hoop improves the connection strength and connection stability between the newly added pile foundation cap and the supporting frame. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 is a schematic structural diagram of a construction structure for expanding the underground space of an existing building by converting piles into columns according to an embodiment of the present application.
[0028] Figure 2 is a partial cross-sectional view for showing the internal structures of the newly added pile foundation cap and the original pile foundation cap in an embodiment of the present application.
[0029] Figure 3 It is a partial sectional view used in the embodiment of the present application to show the expansion water stop strip.
[0030] Description of reference numerals: 1, main building frame column; 2, support frame column; 21, support longitudinal reinforcement; 22, support stirrup; 3, original pile foundation cap; 4, original engineering pile; 5, newly added pile foundation cap; 51, newly added cap longitudinal reinforcement; 52, newly added cap stirrup; 6, original ground beam converted into frame beam; 7, steel section for anchoring; 8, closed concrete block; 81, closed stirrup; 82, closed longitudinal reinforcement; 9, hoop of T-shaped steel member; 10, expansion water stop strip; 11, concrete cushion; 12, brick formwork of pile cap; 13, waterproof board. Specific implementation manners
[0031] The following further describes the present application in detail with reference to the attached Figures 1-3 drawings. The embodiment of the present application provides a construction structure for expanding the underground space of an existing building by converting piles into columns, which has the effect of improving the service safety and service life of the building structure when expanding the underground space of the existing building.
[0032] Referring to Figure 1 and Figure 2 , a construction structure for expanding the underground space of an existing building by converting piles into columns includes a main building frame column 1, a support frame column 2, an original pile foundation cap 3, an original engineering pile 4 and a newly added pile foundation cap 5. The original engineering pile 4 is a cylindrical pile. By setting a support frame on the upper section of the original engineering pile 4 and pouring it with concrete, the upper half of it is changed into a square support frame column 2. The support frame includes support longitudinal reinforcement 21 and support stirrup 22, and the top end of the support longitudinal reinforcement 21 extends out of the support frame column 2.
[0033] Referring to Figure 2 , the original pile foundation cap 3 is formed by pouring concrete. The original pile foundation cap 3 is arranged at the top end of the support frame column 2, and the support longitudinal reinforcement 21 in the support frame column 2 is anchored to the bottom end of the original pile foundation cap 3. The main building frame column 1 is a square column, and the main building frame column 1 is vertically arranged at the top end of the original pile foundation cap 3. A ground beam converted into a frame beam 6 is horizontally arranged on the original pile foundation cap 3. The frame beam longitudinal reinforcement and the vertically arranged frame beam stirrup are arranged in the ground beam converted into a frame beam 6. One end of the frame beam longitudinal reinforcement is anchored into the original pile foundation cap 3, and the top surface height of the ground beam converted into a frame beam 6 is higher than that of the original pile foundation cap 3.
[0034] Referring to Figure 2 and Figure 3, on the top surface of the original pile foundation cap 3, there is a steel section 7 for anchoring. The opposite ends of the steel section 7 for anchoring are respectively connected to the main building frame column 1 and the original ground beam converted into a frame beam 6. On the top surface of the original pile foundation cap 3, there is a closed concrete block 8 for covering and protecting the steel section 7 for anchoring. In the closed concrete block 8, there is a closed frame for support. The closed frame includes closed stirrups 81 and vertically arranged closed longitudinal bars 82. The bottom end of the closed longitudinal bar 82 is anchored in the original pile foundation cap 3.
[0035] Refer to Figure 2 and Figure 3 , the new pile foundation cap 5 is arranged at the bottom end of the support frame column 2. The bottom surface of the new pile foundation cap 5 is flush with the bottom end of the support frame column 2. Inside the new pile foundation cap 5, there are new cap longitudinal bars 51 and new cap stirrups 52. Along the circumferential direction on the outer wall of the support frame column 2, there are two circles of T-shaped steel member hoop 9 connected in parallel. The T-shaped steel member hoop 9 is connected to the new cap longitudinal bars 51. Along the circumferential direction on the support frame column 2, there are two circles of swelling water stop strips 10 connected in parallel. The swelling water stop strips 10 are arranged between the two T-shaped steel member hoops 9.
[0036] Refer to Figure 2 and Figure 3 , on the bottom surface and the peripheral wall of the new pile foundation cap 5, there are concrete cushions 11 arranged horizontally. Around the circumference of the new pile foundation cap 5, there is a brick formwork 12 for the cap. The opposite sides of the brick formwork 12 for the cap are connected to the two concrete cushions 11. On the top surface of the upper concrete cushion 11, there is a waterproof board 13 connected. The top surface of the waterproof board 13 is flush with the top surface of the new pile foundation cap 5.
[0037] Refer to Figure 2 , during the construction of the underground space, after the soil is taken out and the support frame column 2 is exposed, check whether there are defects in the pile body. If there are serious defects, first take temporary support, and then submit to the design to issue corresponding solutions. If the pile body quality of the support frame column 2 is good, after the support frame column 2 is excavated, use a high-pressure water gun to clean the surface soil of the pile body, then chisel off the oil stains, floating slurry, and loose stones on the concrete surface of the pile body, and polish it to a solid base layer. After determining the position of the anchor bars around the pile, carry out post-inserted bars.
[0038] Refer to Figure 2 and Figure 3 , after the pretreatment of the support frame column 2 is completed, install the T-shaped steel member hoop 9. The T-shaped steel member hoop 9 is lofted and processed according to the size of the on-site support frame column 2. The interface surface between the T-shaped steel member hoop 9 and the support frame column 2 is polished flat, and structural adhesive is injected. Install the two swelling water stop strips 10 on the outer peripheral wall of the support frame column 2.
[0039] Refer to Figure 2 and Figure 3, a foundation pit for accommodating the new pile cap 5 is dug on the foundation. A concrete cushion 11 is poured on the inner bottom wall of the dug foundation pit and the foundation surface, and a brick formwork 12 for the pile cap is arranged on the inner side wall of the foundation pit. The brick formwork 12 for the pile cap is connected to the two concrete cushions 11. The longitudinal bars 51 and stirrups 52 of the new pile cap are connected to the outside of the supporting frame column 2, and the longitudinal bars 51 of the new pile cap are connected to the T-shaped steel member hoop 9. A waterproof board 13 is installed on the top surface of the upper concrete cushion 11, and concrete is poured into the foundation pit until it is flush with the top surface of the waterproof board 13. After a period of curing, the new pile cap 5 is formed.
[0040] Refer to Figure 2 and Figure 3 , a steel section 7 for connection and anchoring is connected between the original ground beam converted into a frame beam 6 and the main building frame column 1, and a closed frame is installed on the original pile cap 3, and the closed frame is cast to form a closed concrete block 8. The setting of the steel section 7 for connection and anchoring increases the connection strength between the original ground beam converted into a frame beam 6 and the original pile cap 3, and increases the structural safety. The setting of the closed frame and the closed concrete block 8 protects the steel section 7 for connection and anchoring, and avoids damage caused by the direct exposure of the steel section 7 for connection and anchoring to the outside.
[0041] Refer to Figure 2 and Figure 3 , the settings of the concrete cushion 11, the brick formwork 12 for the pile cap and the waterproof board 13 protect against groundwater, and prevent groundwater from directly seeping between the new pile cap 5 and the supporting frame column 2. When a small amount of groundwater seeps through the construction joint between the new pile cap 5 and the supporting frame column 2, the groundwater contacts the expansion water stop strip 10, and the expansion water stop strip 10 prevents the groundwater from continuing to penetrate upward. The setting of the two expansion water stop strips 10 realizes the double protection of groundwater, which helps to extend the service life of the overall structure. The setting of the T-shaped steel member hoop 9 increases the connection strength between the new pile cap 5 and the supporting frame column 2, and improves the structural stability.
[0042] The implementation principle of the construction structure for expanding the underground space of an existing building by converting piles into columns in the embodiment of the present application is as follows: the setting of the steel section 7 for connection and anchoring increases the connection strength between the original ground beam converted into a frame beam 6 and the original pile cap 3, and increases the structural safety. The setting of the closed frame and the closed concrete block 8 protects the steel section 7 for connection and anchoring, and avoids damage caused by the direct exposure of the steel section 7 for connection and anchoring to the outside.
[0043] The concrete cushion layer 11, the brick formwork 12 of the bearing platform, and the waterproof board 13 protect the groundwater, preventing the groundwater from directly seeping into the space between the newly added pile foundation bearing platform 5 and the supporting frame column 2. The expansion waterstop strip 10 prevents the groundwater from further seeping upward, which helps to extend the service life of the overall structure. The setting of the T-shaped steel member hoop 9 increases the connection strength between the newly added pile foundation bearing platform 5 and the supporting frame column 2, improving the structural stability.
[0044] The above are all preferred embodiments of this application. This does not limit the protection scope of this application. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.
Claims
1. A construction structure for expanding the underground space of an existing building by replacing piles with columns, comprising a supporting frame column (2), a main building frame column (1), an original pile foundation pedestal (3) and a newly added pile foundation pedestal (5), wherein the main building frame column (1) is connected to the top surface of the original pile foundation pedestal (3), the supporting frame column (2) is connected to the bottom surface of the original pile foundation pedestal (3), and the newly added pile foundation pedestal (5) is connected to the supporting frame column (2), characterized in that: It also includes an in-situ beam-converted frame beam (6) horizontally installed on the original pile foundation pedestal (3), the top surface of the in-situ beam-converted frame beam (6) is higher than the top surface of the original pile foundation pedestal (3), and an anchoring steel section (7) is arranged on the original pile foundation pedestal (3), and the opposite ends of the anchoring steel section (7) are respectively connected to the in-situ beam-converted frame beam (6) and the main building frame column (1).
2. The construction structure for expanding the underground space of an existing building by replacing piles with columns according to claim 1 is characterized by: The newly added pile foundation cap (5) is provided with newly added cap longitudinal reinforcement (51) and newly added cap hoop reinforcement (52), and a T-shaped steel member hoop (9) is circumferentially provided on the outer wall of the supporting frame column (2), and two T-shaped steel member hoop (9) are provided in parallel, and the T-shaped steel member hoop (9) is connected to the newly added cap longitudinal reinforcement (51).
3. The construction structure for expanding the underground space of an existing building by converting piles into columns according to claim 1 is characterized by: A closed concrete block (8) is arranged on the original pile foundation cap (3), a closed frame is arranged in the closed concrete block (8), and the closed frame comprises closed stirrups (81) and closed longitudinal bars (82).
4. The construction structure for expanding the underground space of an existing building by replacing piles with columns according to claim 2 is characterized by: An expansion water stop strip (10) is arranged on the outer wall of the supporting frame column (2) along the circumferential direction, and the expansion water stop strip (10) is arranged between two T-shaped steel member hoops (9).
5. The construction structure for expanding the underground space of an existing building by replacing piles with columns according to claim 4 is characterized by: Two expansion water stop strips (10) are arranged in parallel.
6. The construction structure for expanding the underground space of an existing building by replacing piles with columns according to claim 5 is characterized by: A concrete cushion layer (11) is horizontally arranged on the bottom surface of the newly added pile foundation pedestal (5) and on the outer peripheral wall of the newly added pile foundation pedestal (5), and a pedestal brick membrane (12) is arranged on the outer peripheral wall of the newly added pile foundation pedestal (5), and the opposite sides of the pedestal brick membrane (12) are respectively connected to the two concrete cushion layers (11).
7. The construction structure for expanding the underground space of an existing building by replacing piles with columns according to claim 6 is characterized by: A waterproof board (13) is provided on the top surface of the concrete cushion layer (11) located above, and the top surface of the waterproof board (13) is flush with the top surface of the newly added pile foundation cap (5).
8. The construction structure for expanding the underground space of an existing building by replacing piles with columns according to claim 3 is characterized by: The bottom end of the closed longitudinal reinforcement (82) is anchored in the original pile foundation pedestal (3), and the original beam-converted frame beam (6) is provided with frame beam longitudinal reinforcement, and the frame beam longitudinal reinforcement is connected to the anchoring steel section (7).