Construction method of basement outer wall of high-drop main building

Abstract

The application relates to a construction method of a high-drop main building basement outer wall supporting platform, which comprises the following steps: S1, excavating a main building foundation pit; S2, binding main building shear wall steel bars, marking group building platform steel bar connecting positions on the main building steel bars, and obliquely inserting the group building platform steel bars into the main building steel bars from the connecting positions and binding and fixing the group building platform steel bars with the main building steel bars; S3, supporting main building shear wall templates; S4, pouring the main building shear wall, and removing the shear wall templates; S5, constructing a shear wall outer waterproof structure; S6, backfilling concrete in the space outside the main building shear wall in the foundation pit; S7, stacking out a first-stage platform slope by using a bagged graded gravel, pouring a second layer of concrete outside the first-stage platform slope, and laying a waterproof structure; S8, stacking out a second-stage platform slope, pouring a third layer of concrete outside the second-stage platform slope, and laying a waterproof structure; S9, binding platform steel bars; and S10, constructing a podium raft slab; the method is convenient for concrete backfilling construction and guarantees the integrity of the waterproof structure of the platform structure between the main building and the podium.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, and in particular relates to a method for constructing a support platform for the basement exterior wall of a main building with a high elevation difference. Background Technology

[0002] For the construction of a "main building-podium" type building, the raft foundation of the main building is usually lower than that of the podium raft foundation. In order to increase the connection strength between the main building and the podium, the raft foundation of the podium is often connected to the shear wall of the main building.

[0003] The existing technology for connecting the podium raft slab to the shear wall of the main building is as follows: First, the main building raft slab is poured. After pouring to the foundation elevation of the main building shear wall, the foundation of the main building shear wall is poured. After the concrete of the main building shear wall foundation reaches the set strength, the main building shear wall is constructed on the foundation of the main building shear wall. After the main building shear wall reaches the set height and the concrete reaches the set strength, the structure at the connection between the main building shear wall and the podium raft slab is poured to form an integrated connection structure. At the same time, the gap between the main building shear wall and the surrounding foundation pit is backfilled with concrete.

[0004] This construction method has two main drawbacks. First, when pouring the connection structure between the main building shear wall and the podium raft slab, it is necessary to backfill the gap between the main building shear wall and the surrounding foundation pit simultaneously. Therefore, the support piles, capping beams, and sand and gravel cushion layer under the connection structure between the main building shear wall and the podium raft slab will have a certain impact on the concrete backfilling construction, making the concrete backfilling construction inconvenient. Second, the waterproofing effect at the connection between the waterproofing on the outside of the main building shear wall and the waterproofing structure is poor, resulting in poor waterproofing effect at the connection between the main building and the podium. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide a construction method for the foundation platform of the basement exterior wall of a high-drop main building, so as to solve the technical problems of inconvenient concrete backfilling and poor waterproofing effect at the connection between the main building and the podium in the prior art.

[0006] To achieve the above objectives, the technical solution adopted by the present invention for the construction method of the foundation platform for the basement exterior wall of a high-drop main building is as follows:

[0007] A method for constructing a foundation for the exterior wall of a basement of a main building with a high elevation difference includes the following steps:

[0008] S1: Excavation of the main building foundation pit;

[0009] S2: Pouring the main building raft, pouring to the main building shear wall foundation elevation, pouring the main building shear wall foundation, after the main building shear wall foundation concrete reaches the set strength, starting to bind the main building shear wall steel bars, and after the main building shear wall steel bars are bound, marking the position of the podium pile cap steel bar connection on the main building steel bars, then inserting the podium pile cap steel bars from the connection position into the main building steel bars and binding and fixing them;

[0010] S3: Supporting the main building shear wall formwork, supporting the main building shear wall formwork to the position where the main building steel bars and the podium pile cap steel bars are connected, then supporting the main building shear wall formwork above the podium pile cap steel bars, after the formwork is supported, using sealing materials to seal the gap between the podium pile cap steel bars and the shear wall formwork;

[0011] S4: Pouring the main building shear wall, and after the concrete reaches the set strength, removing the shear wall formwork;

[0012] S5: After the formwork is removed, cleaning the garbage in the main building shear wall outer space in the foundation pit, and then constructing the shear wall outer waterproof structure;

[0013] S6: Backfilling concrete in the main building shear wall outer space in the foundation pit, and stopping pouring the first layer of concrete below the pile cap steel bars;

[0014] S7: After the first layer of concrete solidifies, using bagged graded gravel to pile up the first level of pile cap slope on the first layer of concrete, pouring the second layer of concrete on the outer side of the first pile cap slope to be flush with the height of the first pile cap slope, forming the first platform, laying waterproof structure on the first level of pile cap slope and the first platform, and connecting the waterproof structure on the first level of pile cap slope with the waterproof structure on the outer side of the main building shear wall;

[0015] S8: After the waterproof structure is fixed, using bagged graded gravel to pile up the second pile cap slope on the first platform, pouring the third layer of concrete on the outer side of the second pile cap slope to be flush with the height of the second pile cap slope, forming the second platform, and the second platform forms the raft bottom, laying waterproof structure on the second level of pile cap slope and the second platform, connecting the waterproof structure on the second level of pile cap slope with the waterproof structure on the first platform, and connecting the waterproof structure on the second platform with the podium raft waterproof structure;

[0016] S9: Binding the pile cap steel bars, binding and fixing the pile cap steel bars with the podium raft steel bars, and pouring the pile cap;

[0017] S10: After the pile cap is completed, constructing the podium raft.

[0018] Beneficial effects: in the application, the bearing platform steel bars of the podium are inserted into the steel bars of the main building at an angle and are bound and fixed with the steel bars of the main building, and then the main building shear wall is poured and constructed, so that one end of the podium bearing platform steel bars is poured together with the main building shear wall, and the other end of the podium bearing platform steel bars is suspended at this time; then the waterproof structure outside the main building shear wall is constructed, and after the waterproof structure outside the shear wall is constructed, the space outside the main building shear wall is backfilled with concrete, and the concrete is backfilled in three layers; when the concrete is backfilled, the space outside the shear wall is relatively bright, facilitating the backfilling construction of the concrete; on the other hand, when the first layer of concrete is backfilled and constructed, the waterproof structure outside the main building shear wall has been constructed, and when the second layer of concrete is backfilled, the waterproof structure on the first bearing platform slope is connected with the waterproof structure outside the main building shear wall, and the waterproof structure on the first platform is constructed at the same time; when the second layer of concrete is backfilled and constructed, the waterproof structure on the second bearing platform slope is connected with the waterproof structure on the first platform, so as to ensure the integrity of the waterproof structure of the bearing platform structure between the main building and the podium, and to ensure good waterproof effect.

[0019] Further, the inclination angle of the podium bearing platform steel bars from top to bottom and from right to left is 45°, the podium bearing platform includes a vertical part connected with the main building shear wall and a horizontal segment used for connecting with the podium raft, and the horizontal segment and the vertical segment form an inclination angle from top to bottom and from right to left at the connection.

[0020] Beneficial effects: the vertical segment of the podium bearing platform increases the connection strength between the bearing platform and the main building shear wall, and the horizontal segment of the podium bearing platform can increase the connection strength between the bearing platform and the podium raft, so as to increase the connection strength between the podium and the main building through the bearing platform, thereby avoiding excessive differential settlement between the main building and the podium.

[0021] The sealing material is a flexible waterproof plastic material.

[0022] Beneficial effects: the sealing material adopts a flexible plastic material, which can adaptively change the shape of the sealing material according to the gap between the bearing platform steel bars and the formwork, so as to ensure that the sealing material completely seals the gap.

[0023] The waterproof structure outside the shear wall is constructed to 20 cm below the bearing platform steel bars, and the waterproof structure includes a waterproof coating, a waterproof additional layer, a waterproof roll layer and a waterproof protection layer from inside to outside; a 2m long waterproof roll layer is reserved on the bearing platform steel bars.

[0024] Beneficial effects: the waterproof roll layer reserved in the waterproof structure can provide a basis for the overlapping arrangement of the waterproof roll layers in the waterproof structure outside the main building shear wall and the waterproof structure on the first bearing platform slope, so as to ensure the seamless joint of the waterproof structure outside the main building shear wall and the waterproof structure on the first bearing platform slope, thereby ensuring the continuity and integrity of the waterproof structure.

[0025] Further, the waterproof structure on the first-stage bearing platform slope is the same as the waterproof structure outside the shear wall, and the waterproof roll layer reserved in the waterproof structure outside the shear wall extends to the first-stage bearing platform slope and is arranged in an overlapping manner with the waterproof roll layer in the waterproof structure on the first-stage bearing platform slope.

[0026] Beneficial effects: seamless butt joint of the waterproof structure outside the main building shear wall and the waterproof structure on the first-stage bearing platform slope, thereby ensuring the continuity and integrity of the waterproof structure.

[0027] When binding the bearing platform steel bars, the end of the skirt building bearing platform steel bars away from the main building is bound and fixed with the skirt building raft steel bars.

[0028] Beneficial effects: the bearing platform steel bars are arranged in an inclined manner, one end is fixed in the main building shear wall, and the other end is fixed in the skirt building raft, thereby increasing the connection strength between the main building shear wall and the skirt building raft. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a related structure schematic view of a high-fall main building basement outer wall bearing platform construction method of the present application;

[0030] Figure 2 is Figure 1 is an enlarged view of A in the high-fall main building basement outer wall bearing platform construction method.

[0031] The drawings show that: 1 is a main building shear wall; 2 is a waterproof structure; 3 is a skirt building bearing platform steel bar; 4 is a first-stage bearing platform slope; 5 is a first layer of concrete; 6 is a second layer of concrete; 7 is a second-stage bearing platform slope; 8 is a third layer of concrete; and 9 is a raft steel bar. DETAILED DESCRIPTION

[0032] The high-fall main building basement outer wall bearing platform construction method of the present application will be further described in detail below in combination with the drawings and specific embodiments:

[0033] The construction background of the high-fall main building basement outer wall bearing platform construction method of the present application is that the main building is a negative three-story structure below the ground, and the skirt building is a negative one-story structure below the ground, therefore, there is a high fall between the main building basement raft and the skirt building basement raft, in order to increase the connection strength between the skirt building and the main building, a bearing platform is cast between the outer side of the main building shear wall 1 and the skirt building raft to realize the connection between the main building and the skirt building below the ground, thereby increasing the overall seismic performance of the main building and the skirt building; moreover, after a period of time, the main building and the skirt building will settle to different degrees, in the present application, the bearing platform structure is cast between the outer side of the main building shear wall 1 and the skirt building raft to realize the connection between the main building and the skirt building below the ground, and can also avoid excessive differential settlement between the main building and the skirt building.

[0034] Specifically, the basement outer wall of the high-fall main building body is constructed by the following steps.

[0035] S1: excavate the main building foundation pit.

[0036] S2: pour the main building raft, and after pouring to the main building shear wall 1 foundation elevation, pour the main building shear wall 1 foundation. After the main building shear wall 1 foundation concrete reaches the set strength, start binding the main building shear wall 1 reinforcement. After the main building shear wall 1 reinforcement binding is completed, mark the skirt building pile cap reinforcement connection position on the main building negative two layer reinforcement through the support operation platform, then tilt the skirt building pile cap reinforcement from the connection position into the main building reinforcement and bind and fix the main building reinforcement, and the other end of the skirt building pile cap reinforcement extends from the main building reinforcement. In this embodiment, the tilt angle of the skirt building pile cap reinforcement 3 from top to bottom and from right to left is 45°.

[0037] S3: support the main building negative two layer shear wall formwork, and support the main building shear wall 1 formwork above the main building reinforcement and the skirt building pile cap reinforcement connection position after the shear wall formwork is supported to the main building reinforcement and the skirt building pile cap reinforcement connection position. After the formwork is supported, the gap between the skirt building pile cap reinforcement and the shear wall formwork is sealed with sealing material to prevent concrete from leaking from the gap during pouring of the main building shear wall 1. In this embodiment, the sealing material is a flexible waterproof plastic material, so that the shape of the sealing material can adaptively change according to the gap between the pile cap reinforcement and the formwork, ensuring that the sealing material completely seals the gap.

[0038] S4: pour the main building negative two layer top plate and shear wall, and remove the shear wall formwork after the concrete reaches the set strength.

[0039] S5: after the formwork is removed, clean up the garbage in the space outside the main building shear wall 1 in the main building foundation pit, and then construct the shear wall outer waterproof structure 2.

[0040] The shear wall outer waterproof structure 2 is constructed to a height of 20 cm below the pile cap reinforcement and the main building shear wall 1 connection position, and the waterproof structure 2 includes, from inside to outside (the inside is close to the main building shear wall 1), a waterproof coating, a waterproof additional layer, a waterproof roll layer, and a waterproof protection layer. When the waterproof roll layer of the shear wall outer waterproof structure 2 is constructed to the pile cap reinforcement and the main building shear wall 1 connection position, a 2 m long waterproof roll layer is reserved and wound on the pile cap reinforcement.

[0041] S6: backfill concrete in the space outside the main building shear wall 1 in the foundation pit. In this embodiment, the backfilled concrete is C15 concrete, and the first layer of concrete 5 is constructed to a height of 20 cm below the pile cap reinforcement and the main building shear wall 1 connection position.

[0042] S7: After the first layer of concrete 5 is initially solidified, the first level of the platform slope 4 is piled out on the first layer of concrete 5 using the sack-packed graded gravel, the slope surface of the first level of the platform slope 4 is inclined from top to bottom and from outside to inside, and the inner side of the lower end of the first level of the platform slope is closely arranged with the main building shear wall 1; the second layer of concrete 6 is poured on the outside of the first level of the platform slope 4, the second layer of concrete 6 is flush with the first level of the platform slope in height, forming the first platform, the waterproof structure 2 is laid on the first level of the platform slope 4 and the first platform, the waterproof structure 2 on the first level of the platform slope and the first platform is the same as the waterproof structure 2 outside the main building shear wall 1, and all includes a waterproof coating, a waterproof additional layer, a waterproof roll layer, and a waterproof protection layer. The waterproof structure 2 on the first level of the platform slope is connected with the waterproof structure 2 outside the main building shear wall 1, specifically, the reserved waterproof roll layer in the waterproof structure 2 outside the shear wall is laid on the first level of the platform slope, and is overlapped with the waterproof roll layer in the waterproof structure 2 of the first level of the platform slope 4, so as to ensure the continuity, integrity and tightness of the waterproof structure 2 at the connection between the first level of the platform slope 4 and the main building shear wall 1, and ensure the waterproof effect at the connection between the first level of the platform slope 4 and the main building shear wall 1. The waterproof structure 2 on the first platform is only laid from the inner side to the outer side for a certain distance, and at the same time, after the waterproof structure 2 on the first platform is laid, the reserved waterproof roll layer in the waterproof structure 2 on the first platform is reserved for 2m.

[0043] S8: After the waterproof structure 2 on the first level of the platform slope 4 and the first platform is laid, the second level of the platform slope is piled out on the first platform using the sack-packed graded gravel, the second level of the platform slope 7 is arranged in parallel and spaced apart with the first level of the platform slope, and the first platform between the second level of the platform slope and the first level of the platform slope forms a step surface connecting the first level of the platform slope 4 and the second level of the platform slope. In the embodiment, the waterproof structure 2 on the first platform can completely cover the step surface. The step surface serves as a support surface for supporting the podium platform.

[0044] The third layer of concrete 8 is poured on the outside of the second level of the platform slope 7, and the third layer of concrete 8 is flush with the second level of the platform slope in height, forming the second platform, and the second platform serves as a podium raft support structure.

[0045] The waterproof structure 2 is laid on the second level of the platform slope 7 and the second platform, the waterproof structure 2 on the second level of the platform slope 7 is connected with the waterproof structure 2 on the first platform, specifically, the reserved waterproof roll layer in the waterproof structure 2 on the first platform is unfolded on the second level of the platform slope 7, so that the waterproof roll layer in the waterproof structure 2 on the second level of the platform slope 7 is overlapped with the reserved waterproof roll layer in the waterproof structure 2 on the first platform on the slope surface of the second level of the platform slope 7. The waterproof structure 2 on the second platform is connected with the waterproof structure 2 of the podium raft, specifically, the waterproof roll layer in the waterproof structure 2 on the second platform is overlapped with the waterproof roll layer of the podium raft on the second platform.

[0046] S9: binding the cap steel bars, binding and fixing the cap steel bars with the podium raft steel bars 9, specifically, binding and fixing the end of the podium cap steel bars 3 away from the main building with the podium raft steel bars 9, so that the podium raft steel bars 9 are connected with the main building shear wall 1 steel bars through the inclined cap steel bars. Then, pouring the cap, the podium cap structure includes a horizontal section supported on the step surface connecting the first-stage cap slope 4 and the second-stage cap slope 7, the height of the horizontal section is the same as the height of the second-stage cap slope 7, and the horizontal section is flush with the second platform to jointly support the podium raft, and the podium cap structure further includes a triangular section vertically arranged with the horizontal section, one side of the triangular section is connected with the main building shear wall 1, and the other side of the triangular section is supported on the first-stage cap slope 4 slope surface. Thus, the main building and the podium raft are connected through the podium cap.

[0047] S10: after the completion of the cap construction, constructing the podium raft.

[0048] In the present application, when the main building shear wall 1 is constructed, the cap steel bars are inserted into the main building steel bars in an inclined manner and are bound and fixed with the main building steel bars, then the main building shear wall 1 is poured and constructed, so that one end of the podium cap steel bars 3 is poured together with the main building shear wall 1, and the other end of the podium cap steel bars 3 is suspended and arranged at this time; then the waterproof structure 2 outside the main building shear wall 1 is constructed, and after the completion of the construction of the waterproof structure 2 outside the shear wall, the space outside the main building shear wall 1 is backfilled with concrete, and the concrete is backfilled in three layers. When the concrete is backfilled, the space outside the shear wall is relatively bright, which facilitates the backfilling construction of the concrete. On the other hand, when the first layer of concrete 5 is backfilled and constructed, the waterproof structure 2 outside the main building shear wall 1 has been constructed, and when the backfilling of the second layer of concrete 6 is completed, the waterproof structure 2 on the first-stage cap slope 4 is connected with the waterproof structure 2 outside the main building shear wall 1, and the waterproof structure 2 on the first platform is constructed at the same time. When the backfilling construction of the second layer of concrete 6 is completed, the waterproof structure 2 on the second-stage cap slope 7 is connected with the waterproof structure 2 on the first platform, so as to ensure the integrity of the waterproof structure 2 of the cap structure between the main building and the podium, and to ensure good waterproof effect.

[0049] In the above embodiment, the inclination angle of the podium cap steel bars from top to bottom and from right to left is 45°, and in other embodiments, the inclination angle of the podium cap steel bars from top to bottom and from right to left is 40°.

[0050] In the above embodiment, the plugging material is a flexible waterproof plastic material, and in other embodiments, the plugging material can also be other materials.

[0051] In the above embodiment, the waterproof structure outside the shear wall is constructed to a position 20 cm below the cap steel bars, and in other embodiments, the waterproof structure outside the shear wall is constructed to a position 10 cm below the cap steel bars.

[0052] In the above embodiment, the waterproof structure on the first platform has a reserved waterproof roll layer reserved by 2m; in other embodiments, the waterproof structure on the first platform can also not have a reserved waterproof roll layer.

[0053] In the above embodiment, the waterproof roll layer of the waterproof structure on the second platform is arranged in overlap with the waterproof roll layer of the podium raft slab; in other embodiments, the waterproof roll layer of the waterproof structure on the second platform can also not be arranged in overlap with the waterproof roll layer of the podium raft slab, but can be merely abutted.

Claims

1. A method for constructing a foundation for the basement exterior wall of a main building with a high elevation difference, characterized in that: Includes the following steps: S1: Excavation of the main building foundation pit; S2: Pour the raft foundation of the main building to the elevation of the shear wall foundation of the main building, then pour the shear wall foundation of the main building. After the concrete of the shear wall foundation of the main building reaches the set strength, start tying the steel bars of the shear wall of the main building. After the steel bars of the shear wall of the main building are tied, mark the connection position of the podium foundation steel bars on the steel bars of the main building. Then, insert the podium foundation steel bars into the main building steel bars at an angle from the connection position and tie them to the main building steel bars for fixation. S3: Erect the shear wall formwork of the main building. The shear wall formwork is erected until it is disconnected at the connection point between the main building reinforcement and the podium foundation reinforcement. Then, erect the main building shear wall formwork above the podium foundation reinforcement. After the formwork is erected, use sealing material to seal the gap between the podium foundation reinforcement and the shear wall formwork. S4: Pour the shear wall of the main building. Remove the shear wall formwork after the concrete reaches the set strength. S5: After the formwork is removed, clean up the debris in the main building foundation pit outside the shear wall of the main building, and then construct the waterproof structure outside the shear wall. S6: Backfill concrete in the space outside the shear wall of the main building in the foundation pit, and stop pouring the first layer of concrete when it reaches the bottom of the pile cap reinforcement. S7: After the first layer of concrete has solidified, the first-level pier slope is built on the first layer of concrete using sacks of graded crushed stone. The second layer of concrete on the outside of the first-level pier slope is poured to be level with the height of the first pier slope, forming the first platform. A waterproof structure is laid on the first-level pier slope and the first platform. The waterproof structure on the first-level pier slope is connected to the waterproof structure on the outside of the shear wall of the main building. S8: After the waterproof structure is fixed, use burlap sacks filled with graded crushed stone to build the second pier slope on the first platform. Pour the third layer of concrete on the outside of the second pier slope to be level with the height of the second pier slope to form the second platform. The second platform forms the bottom of the raft slab. Lay the waterproof structure on the second pier slope and the second platform. The waterproof structure on the second pier slope is connected to the waterproof structure on the first platform. The waterproof structure on the second platform is connected to the waterproof structure of the podium raft slab. S9: Tie the foundation reinforcement bars, tie and fix the foundation reinforcement bars to the podium raft slab reinforcement bars, and pour the foundation; S10: After the foundation is completed, construct the raft slab of the podium.

2. The construction method for the foundation platform of the basement exterior wall of a high-drop main building according to claim 1, characterized in that, The steel reinforcement of the podium foundation is inclined at an angle of 45° from top to bottom and from right to left. The podium foundation includes a triangular segment connected to the shear wall of the main building and a horizontal segment supported on the first platform.

3. A construction method for the foundation platform of the basement exterior wall of a main building with a high elevation difference, as described in claim 1 or 2, is characterized in that... The sealing material is a flexible waterproof plastic material.

4. A construction method for the foundation support platform of the basement exterior wall of a main building with a high elevation difference, as described in claim 1 or 2, is characterized in that... The external waterproofing structure of the shear wall is constructed to 20cm below the foundation reinforcement. The waterproofing structure, from the inside out, includes a waterproof coating, an additional waterproof layer, a waterproof roll, and a waterproof protective layer. A 2m section of the waterproof roll in the external waterproofing structure of the shear wall is reserved and wrapped around the foundation reinforcement.

5. The construction method for the foundation platform of the basement exterior wall of a high-drop main building according to claim 4, characterized in that, The waterproofing structure on the first-level pier slope is the same as the waterproofing structure outside the shear wall. The reserved waterproof membrane in the waterproofing structure outside the shear wall extends to the first-level pier slope and overlaps with the waterproof membrane in the waterproofing structure of the first-level pier slope. The reserved waterproof membrane in the waterproofing structure on the first platform is reserved for 2m.

6. The construction method for the foundation platform of the basement exterior wall of a high-drop main building according to claim 5, characterized in that, The waterproofing structure on the second-level pier slope is the same as the waterproofing structure outside the shear wall. The reserved waterproof membrane in the waterproofing structure on the first platform extends to the second-level pier slope and overlaps with the waterproof membrane in the waterproofing structure of the second-level pier slope. The waterproof membrane in the waterproofing structure on the second platform overlaps with the waterproof membrane of the podium raft slab.

7. A construction method for the foundation platform of the basement exterior wall of a main building with a high elevation difference, as described in claim 1 or 2, is characterized in that... When tying the foundation reinforcement, the end of the podium foundation reinforcement furthest from the main building is tied and fixed to the podium raft slab reinforcement.

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