Super high-rise raft structure

Abstract

The utility model provides a raft structure for a super high-rise building. The raft plate structure comprises a core raft plate bin and a plurality of groups of common raft plate bins distributed around the core raft plate bin, and the bin dividing seams are arranged between the core raft plate bin and the plurality of groups of common raft plate bins adjacent to the core raft plate bin and between every two adjacent groups of common raft plate bins; the core raft bin is deepened from the periphery to the middle in a ladder table mode. Upturning side walls are arranged at the contact positions of the edges of the raft plate structure and the underground diaphragm walls on the periphery of the foundation pit, a plurality of steel bar heads of each engineering pile foundation are anchored into the raft plate structure in a radial horn mouth shape, and the raft plate structure adopts a backwater type waterproof mode. The raft plate structure is divided into the core raft plate bin and the common raft plate bins arranged around the core raft plate bin in a surrounding mode, an effective supporting system is rapidly formed through the poured common raft plate bins and the underground continuous walls around the foundation pit to resist the action of water pressure around the foundation pit in the flood season, and the deformation risk of the foundation pit is better controlled; and the waterproof structure is simple and convenient to construct.

Description

Technical Field

[0001] The utility model belongs to the field of construction engineering, and in particular relates to a super high-rise raft structure. Background Art

[0002] With the planning and development of cities, riverside cities generally focus on developing riverside economic zones, creating riverside business districts, and building many super high-rise buildings. As large-scale building complexes, these super high-rise buildings are built along the river and generally include office, residential, commercial and other functions. Such super high-rise basements are often developed as a whole, but because of the large area and thickness of the basement raft, the raft structure takes a long time to construct, and the pit bottom cannot be closed for a long time. During the flood season, the water pressure around the foundation pit and the pit bottom is very large, which can easily cause problems such as foundation pit instability and sudden surges at the pit bottom. The existing raft structure does not take into account the flood season risks of the super high-rise raft structure along the river. Summary of the invention

[0003] The utility model proposes a super high-rise raft structure, aiming to solve the problem that the existing technology does not fully consider the safety risks of super high-rise raft construction during flood season.

[0004] In order to solve the above technical problems, the utility model provides a super high-rise raft structure, comprising a plurality of engineering pile foundations located at the bottom of the raft structure, the raft structure comprising a core raft bin and a plurality of groups of ordinary raft bins distributed around the core raft bin, the compartment seams are between the core raft bin and the plurality of groups of ordinary raft bins adjacent thereto, and between two adjacent groups of ordinary raft bins; the core raft bin is deepened from the four sides to the middle in a stepped manner, and the raft thickness at the center of the core raft bin is 5m to 8m, and the thickness of the ordinary raft bin is 1.2 to 1.5m; an upturned side wall is provided at the contact portion between the edge of the raft structure and the underground continuous wall around the foundation pit, and a plurality of steel bar heads of each engineering pile foundation are anchored in the raft structure in a radial trumpet shape, and the raft structure adopts back-water waterproofing; a water-stop steel plate is provided at each compartment seam and the upturned side wall.

[0005] A further technical solution of the utility model is as follows: the raft structure is located within the 500m flood control line along the river, the plane size of the core raft warehouse is greater than or equal to 100m*100m, the volume exceeds 40,000 cubic meters, and the ground height of the core tube superstructure it supports exceeds 400m.

[0006] A further technical solution of the utility model is as follows: the plane length and width of each group of ordinary raft silos are less than or equal to 40m, the volume does not exceed 2,000 cubic meters, and the ground height of the upper skirt structure supported by the ordinary raft silos does not exceed 30m.

[0007] The better technical solution of the utility model: the structural concrete of the core raft silo and the ordinary raft silo are both made of high-strength self-waterproof concrete, the casting top surface elevation is consistent, and the casting order of the ordinary raft silo is earlier than that of the core raft silo; the structural concrete of the core raft silo is C50P12, and the ordinary raft silo is C40P12; there is no waterproof layer between the raft structure and the concrete cushion layer at the bottom of the foundation pit, and a 1-2mm waterproof coating layer and a 18-22cm thick plain concrete waterproof protective layer are provided on the top surface of the raft structure, and the waterproof coating layer adopts a cement-based penetrating crystalline waterproof coating.

[0008] The utility model has a better technical solution: the raft structure is also provided with vertical lattice columns and drainage wells, the vertical lattice columns are arranged at intervals of 8 to 15 meters, and each vertical lattice column is located above the engineering pile foundation; the drainage wells are arranged at intervals of 20 to 30 meters, and the wellhead of each drainage well is higher than the top surface of the raft structure; the outer rings of the vertical lattice columns and the drainage wells are welded with water stop rings, and when the thickness of the raft exceeds 2m, a water stop ring is provided between the vertical lattice columns and the drainage wells at intervals of 0.8 to 1.2m.

[0009] The better technical solution of the utility model: the height of the upward side wall is 700-900mm, and a construction joint of the side wall is reserved; a 3-4mm thick waterstop steel plate is vertically arranged at the reserved side wall construction joint of the upward side wall; the waterstop steel plate is a concave structure, and the groove surface faces one side of the underground continuous wall; the upward side wall is directly in close contact with the underground continuous wall around the foundation pit, and the wall surface of the upward side wall away from the underground continuous wall is provided with a 1-2mm cement-based penetrating crystalline waterproof coating layer.

[0010] The preferred technical solution of the utility model is as follows: the bottom and top surfaces of the core raft silo are respectively provided with a bottom steel mesh and a surface steel mesh, and the bottom steel mesh and the surface steel mesh of the core raft silo are respectively provided with 4 to 6 high-strength steel bars with a diameter of 32 to 36 mm, and at the same time, a temperature structural steel layer is arranged every 1 to 1.5 m in the depth range of the bottom steel mesh and the surface steel mesh; the steel content of the core raft silo is 90 to 110 kg / m 3 The structural concrete is cast in one continuous step.

[0011] The better technical solution of the utility model is as follows: each group of ordinary raft silos is provided with a bottom steel mesh and a surface steel mesh on the bottom and top surfaces respectively, and the bottom steel mesh and the surface steel mesh of the ordinary raft silo are respectively provided with 2 to 3 high-strength steel bars with a diameter of 25 to 32 mm; the interval between the pouring of concrete of two adjacent groups of ordinary raft silos is at least 7 days.

[0012] The utility model has a better technical solution: multiple steel bar heads of each engineering pile foundation are bent and anchored into the raft structure, and are fixedly connected to the bottom steel mesh and the surface steel mesh of the raft structure, and the bending angle of each steel bar head is 10 to 15 degrees.

[0013] The better technical solution of the utility model: the partition seam includes two layers of non-removable dense mesh steel wire mesh, the top of the dense mesh steel wire mesh is fixedly connected to the surface steel mesh, and the bottom is fixedly connected to the bottom steel mesh; the waterstop steel plate at the partition seam is 3 to 4 mm thick and has a concave structure, which is horizontally arranged at half the height of the partition seam, and the groove surface faces the top surface of the raft structure.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] (1) The utility model divides the raft structure into a core raft bin and a plurality of ordinary raft bins arranged around the core raft bin. During the specific pouring process, the ordinary raft bin is poured before the core raft bin, from shallow to deep. The poured ordinary raft bin and the underground continuous wall around the foundation pit quickly form an effective support system to resist the water pressure around the foundation pit during the flood season, thereby better controlling the risk of foundation pit deformation.

[0016] (2) Under the influence of vertical components such as engineering piles, lattice columns, and drainage wells, the raft slab of the utility model adopts backwater waterproofing, which greatly reduces the difficulty of waterproofing construction at the bottom of the raft slab and can greatly save the construction period of waterproofing.

[0017] (3) The raft structure of the utility model is divided into multiple compartments. During the construction of ordinary raft compartments, the reinforcement of the core raft compartment is carried out simultaneously, which can shorten the total construction period of the entire raft project. It has the advantages of high work efficiency, high construction safety, and a large amount of time and cost savings, and has obvious promotion and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic plan view of the super high-rise raft structure of the utility model;

[0019] Figure 2 This is a schematic elevation diagram of the super high-rise raft structure of the utility model;

[0020] Figure 3 This is a schematic diagram of the waterproof structure in the utility model;

[0021] Figure 4 It is a schematic diagram of the steel bar layout in the compartment gap of the utility model;

[0022] Figure 5 This is a schematic diagram of the anchoring of the pile foundation reinforcement head in the utility model;

[0023] Figure 6 It is a schematic diagram of the layout of the steel mesh in the utility model.

[0024] In the figure: 1-core raft silo, 2-ordinary raft silo, 3-dividing silo seam, 301-bottom steel mesh, 302-surface steel mesh, 303-structural reinforcement layer, 304-dense steel wire mesh, 4-waterproof steel plate, 5-raft slab upturned side wall, 6-waterproof coating layer, 7-waterproof protective layer, 8-engineering pile foundation, 9-concrete cushion layer, 10-pile foundation steel bar head, 11-vertical lattice column, 12-drainage well, 13-underground continuous wall, DETAILED DESCRIPTION

[0025] The technical solution of the utility model is described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the utility model and all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the utility model.

[0026] In the description of the present utility model, it should be understood that the terms "upper", "lower", "inside", "outside", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the products of the utility model are usually placed when in use, or are directions or positional relationships commonly understood by those skilled in the art. These directions or positional relationships are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the equipment or components referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limitations on the present utility model.

[0027] The embodiment provides a super high-rise raft structure, wherein the raft structure is located within the 500m flood control line of the river. Figures 1 to 6 As shown, it includes a plurality of engineering pile foundations 8 located at the bottom of the raft structure, the raft structure includes a core raft silo 1 and a plurality of groups of ordinary raft silos 2 distributed around the core raft silo 1, the partition seams 3 are between the core raft silo 1 and the plurality of groups of ordinary raft silos 2 adjacent thereto, and between two adjacent groups of ordinary raft silos 2; the engineering pile foundations 8 are distributed at the bottom of the ordinary raft silos 2. Figure 1 As shown in the embodiment, the core raft silo 1 is the E1 area in the middle. The plane size of the core raft silo 1 is 108m*107m, the volume is 41733 cubic meters, and the ground height of the core tube upper structure it carries is 475m. The ordinary raft silo 2 is divided into four areas A, B, C, and D, with a total of 29 small silos. The plane length and width of each small silo are controlled within 40m in principle, the volume of the small silo does not exceed 2,000 cubic meters in principle, the thickness of the small silo is 1.2-1.5m, and the ground height of the upper skirt structure carried by the ordinary raft silo does not exceed 30m. The adjacent small silo structures of the ordinary raft silo shall not be constructed at the same time, and shall be poured at least 7 days apart. The non-adjacent small silos in areas A, B, C, and D can be poured and formed at the same time, and 3-4 small silo structures can be poured every week.

[0028] The super high-rise raft structure in the embodiment, such as Figure 2 As shown, the core raft silo 1 is stepped from the periphery to the center, and the thickness of the raft is stepped from the periphery to the center. The general depth of the raft is 5m, and the depth of the local pit is 7.1m. Figure 4 , Figure 5 and Figure 6 As shown, the bottom and top surfaces of the core raft silo 1 and the ordinary raft silo 2 are respectively provided with a bottom steel mesh 301 and a surface steel mesh 302. The bottom steel mesh 301 and the surface steel mesh 302 of the core raft silo 1 are respectively provided with 4 high-strength steel bars with a diameter of 36 mm. At the same time, a temperature structural steel layer 303 is arranged every 1.5 m in the depth range of the bottom steel mesh 301 and the surface steel mesh 302, and the steel bar diameter is 14 mm. The steel content of the core raft silo 1 is 90-110 kg / m 3 , the structural concrete is cast in one go. The bottom steel mesh 301 and the surface steel mesh 302 of the common raft silo 2 are respectively laid with 2 to 3 high-strength steel bars with a diameter of 25 to 32 mm; the concrete casting of two adjacent groups of common raft silos 2 shall not be carried out at the same time, and the casting shall be carried out at least 7 days apart. The common raft silos 2 in areas A, B, C, and D that are not adjacent to each other can be cast at the same time, and 3 to 4 common raft silos 2 structures can be cast every week. Figure 5 As shown, the multiple steel bar heads 10 of each engineering pile foundation 8 are anchored in the raft structure in a radial trumpet shape. The multiple steel bar heads 10 of each engineering pile foundation 8 are bent and anchored in the raft structure, and are fixedly connected to the bottom steel mesh 301 and the surface steel mesh 302 of the raft structure. The bending angle of each steel bar head 10 is 10 to 15 degrees.

[0029] The super high-rise raft structure in the embodiment, such as Figure 2 and Figure 3 As shown, the edge of the raft structure is provided with an upward-turned side wall 5 at the contact point with the underground continuous wall 13 around the foundation pit. The setting of the upward-turned side wall 5 is to facilitate a better integral connection between the structure of the raft and the side wall at the turning point. The upward-turned height is 800mm, and a construction joint of the side wall is reserved. A 3mm thick vertical waterstop steel plate 4 is provided at the upward-turned construction joint, and the groove of the waterstop steel plate faces the outside of the side wall, that is, close to the 1200mm ground-connected wall 13. The upward-turned side wall 5 on the raft is directly in close contact with the ground-connected wall 13 around the foundation pit, and no waterproof layer is provided between the ground-connected wall. After the side wall structure is constructed, a 1mm thick cement-based penetrating crystalline waterproof coating layer 6 is applied to the side wall surface. The concrete of the upward-turned side wall is C40P12. Figure 4As shown, a waterstop steel plate 4 is provided at each compartment seam 3, and the compartment seam 3 includes two layers of non-removable dense mesh steel wire mesh 304, the top of the dense mesh steel wire mesh 304 is fixedly connected to the surface steel mesh 302, and the bottom is fixedly connected to the bottom steel mesh 301; the waterstop steel plate 4 at the compartment seam 3 is 3 to 4 mm thick and has a concave structure, which is horizontally arranged at half the height of the compartment seam 3, and the groove surface faces the top surface of the raft structure.

[0030] The super high-rise raft structure in the embodiment adopts backwater waterproofing; the structural concrete of the core raft silo 1 and the ordinary raft silo 2 are both made of high-strength self-waterproof concrete, the top surface elevation of the casting is the same, and the casting order of the ordinary raft silo 2 is earlier than that of the core raft silo 1; the structural concrete of the core raft silo 1 is C50P12, and the ordinary raft silo 2 is C40P12; Figure 3 As shown, there is no waterproof layer between the raft structure and the concrete cushion at the bottom of the foundation pit. A 1mm waterproof coating layer 6 and a 20cm thick plain concrete waterproof protective layer 7 are provided on the top surface of the raft structure. The waterproof coating layer 6 adopts a cement-based penetrating crystalline waterproof coating. The raft structure is also provided with vertical lattice columns 11 and drainage wells 12. The vertical lattice columns 11 are arranged at intervals of 8 to 15 meters, and each vertical lattice column 11 is located above the engineering pile foundation 8; the drainage wells 12 are arranged at intervals of 20 to 30 meters, and the wellhead of each drainage well 12 is higher than the top surface of the raft structure; the outer rings of the vertical lattice columns 11 and the drainage wells 12 are welded with water stop rings. When the thickness of the raft exceeds 2m, a water stop ring is provided between the vertical lattice columns 11 and the drainage wells 12 at intervals of 0.8 to 1.2m.

[0031] The super high-rise raft structure described in the embodiment adopts ultra-low hydration hot high-strength concrete. The total cementitious material dosage of C40P12 concrete selected for the ordinary raft silo 2 is 330kg / m3, and the water-binder ratio is 0.44; the total cementitious material dosage of C50P12 concrete selected for the core raft silo 2 is 380kg / m3, and the water-binder ratio is 0.39. The concrete admixture adopts double admixture technology, C40P12 adds Class I low-calcium fly ash accounting for 30% of the total cementitious material, and adds S95 grade granulated blast furnace slag powder accounting for 12% of the total cementitious material. C50P12 adds Class I low-calcium powder upturned side wall concrete is C40P12 fly ash accounting for 32% of the total cementitious material, and adds S95 grade granulated blast furnace slag powder accounting for 13% of the total cementitious material. The crushed stone particle size adopts continuous grading of 5-31.5mm, the fine aggregate is river sand with a sand ratio of 42%, and polycarboxylic acid high-efficiency water-reducing agent is added. The final strength of concrete is assessed based on the 60-day strength.

[0032] The common raft silo 2 described in the embodiment is buried shallower than the core raft silo 1, and the top surface elevation is consistent, but the pouring order of the common raft silo 2 should be earlier than the core raft silo 1, so that the poured common raft silo 2 and the underground continuous wall 13 around the foundation pit can quickly form an effective support system to resist the water pressure around the foundation pit during the flood season, so as to control the risk of foundation pit deformation. At the same time, during the construction of the common raft silo 2, the core raft silo 1 reinforcement is carried out simultaneously, which can shorten the total construction period of the entire raft project. The core raft silo 1 structure should use finite element analysis in advance to simulate the temperature and stress changes under the above-mentioned shallow-to-deep construction sequence to ensure that the structural safety and durability verification is passed.

[0033] The ordinary raft silo 2 described in the embodiment is located around the foundation pit. Its structural concrete pouring can be jointly poured by setting up 3-4 car pumps and ground pumps on the sidewalks around the top of the foundation pit. The pouring efficiency of the ground pump is 30m3 / h, and the pouring efficiency of the car pump is 45m3 / h. The pouring speed per hour is 90-180m3. The pouring time of each small silo of the ordinary raft silo can be controlled within 20 hours. The volume of the core raft silo 1 exceeds 40,000 cubic meters. There are no conditions for setting up a large number of car pumps and ground pumps around the foundation pit. In order to control the overall one-time continuous pouring time within 72 hours, the core raft silo 1 is mainly poured using 8 sets of concrete chute equipment, and a total of 6 car pumps and ground pumps are arranged on the top of the foundation pit for auxiliary pouring.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A super high-rise raft structure, comprising a plurality of engineering pile foundations (8) located at the bottom of the raft structure, characterized in that: The raft structure comprises a core raft bin (1) and a plurality of groups of ordinary raft bins (2) distributed around the core raft bin (1); the bin seams (3) are between the core raft bin (1) and the plurality of groups of ordinary raft bins (2) adjacent thereto, and between two adjacent groups of ordinary raft bins (2); the core raft bin (1) is deepened from the periphery to the middle in a stepped manner, and the raft thickness at the center of the core raft bin (1) is 5m to 8m, and the thickness of the ordinary raft bin (2) is 1.2 to 1.5m; an upturned side wall (5) is provided at the contact portion between the edge of the raft structure and the underground continuous wall (13) around the foundation pit, and a plurality of steel bar heads (10) of each engineering pile foundation (8) are anchored in the raft structure in a radial trumpet shape, and the raft structure adopts backwater waterproofing; a water stop steel plate (4) is provided at each bin seam (3) and the upturned side wall (5).

2. A super high-rise raft structure according to claim 1, characterized in that: The raft structure is located within the 500m flood control line along the river. The plane size of the core raft warehouse (1) is greater than or equal to 100m*100m, the volume exceeds 40,000 cubic meters, and the ground height of the core tube superstructure it supports exceeds 400m.

3. A super high-rise raft structure according to claim 1 or 2, characterized in that: The plane length and width dimensions of each group of common raft silos (2) are less than or equal to 40m, and the volume does not exceed 2,000 cubic meters. The ground height of the upper skirt structure supported by the common raft silos (2) does not exceed 30m.

4. A super high-rise raft structure according to claim 1 or 2, characterized in that: The structural concrete of the core raft silo (1) and the common raft silo (2) are both made of high-strength self-waterproof concrete, and the top surface elevations are the same when cast, and the casting sequence of the common raft silo (2) is prior to that of the core raft silo (1); the structural concrete of the core raft silo (1) is C50P12, and the structural concrete of the common raft silo (2) is C40P12; there is no waterproof layer between the raft structure and the concrete cushion layer (9) at the bottom of the foundation pit, and a 1-2 mm thick waterproof coating layer (6) and a 18-22 cm thick plain concrete waterproof protective layer (7) are provided on the top surface of the raft structure, and the waterproof coating layer (6) is a cement-based penetrating crystalline waterproof coating.

5. A super high-rise raft structure according to claim 1 or 2, characterized in that: The raft structure is also provided with vertical lattice columns (11) and drainage wells (12). The vertical lattice columns (11) are arranged at intervals of 8 to 15 meters, and each vertical lattice column (11) is located above the engineering pile foundation (8); the drainage wells (12) are arranged at intervals of 20 to 30 meters, and the wellhead of each drainage well (12) is higher than the top surface of the raft structure; the outer rings of the vertical lattice columns (11) and the drainage wells (12) are welded with water stop rings. When the thickness of the raft exceeds 2 meters, the vertical lattice columns (11) and the drainage wells (12) are provided with a water stop ring at intervals of 0.8 to 1.2 meters.

6. A super high-rise raft structure according to claim 1 or 2, characterized in that: The height of the upward side wall (5) is 700 to 900 mm, and a side wall construction joint is reserved. A 3 to 4 mm thick water-stop steel plate (4) is vertically arranged at the reserved side wall construction joint of the upward side wall (5), and the water-stop steel plate (4) is a concave structure, and the concave surface faces one side of the underground continuous wall (13); the upward side wall (5) is directly in close contact with the underground continuous wall (13) around the foundation pit, and the wall surface of the upward side wall (5) away from the underground continuous wall (13) is provided with a 1 to 2 mm thick cement-based penetrating crystalline waterproof coating layer (6).

7. The super high-rise raft structure according to claim 2, characterized in that: The bottom surface and top surface of the core raft silo (1) are respectively provided with a bottom steel mesh (301) and a surface steel mesh (302); the bottom steel mesh (301) and the surface steel mesh (302) of the core raft silo (1) are respectively provided with 4 to 6 high-strength steel bars with a diameter of 32 to 36 mm; and a temperature structural steel layer (303) is provided at intervals of 1 to 1.5 m within the depth range of the bottom steel mesh (301) and the surface steel mesh (302); the steel content of the core raft silo (1) is 90 to 110 kg / m 3 The structural concrete is cast in one continuous step.

8. The super high-rise raft structure according to claim 3, characterized in that: Each group of ordinary raft silos (2) is provided with a bottom layer steel mesh (301) and a surface layer steel mesh (302) on the bottom and top surfaces respectively. The bottom layer steel mesh (301) and the surface layer steel mesh (302) of the ordinary raft silos (2) are respectively provided with 2 to 3 high-strength steel bars with a diameter of 25 to 32 mm. The interval between the pouring of concrete of two adjacent groups of ordinary raft silos (2) is at least 7 days.

9. A super high-rise raft structure according to claim 7 or 8, characterized in that: A plurality of steel bar heads (10) of each engineering pile foundation (8) are bent and anchored into the raft structure, and are fixedly connected to the bottom steel bar mesh (301) and the surface steel bar mesh (302) of the raft structure, and the bending angle of each steel bar head (10) is 10 to 15 degrees.

10. A super high-rise raft structure according to claim 7 or 8, characterized in that: The compartment seam (3) comprises two layers of non-removable dense mesh steel wire mesh (304), the top of the dense mesh steel wire mesh (304) is fixedly connected to the surface layer steel mesh (302), and the bottom is fixedly connected to the bottom layer steel mesh (301); the water stop steel plate (4) at the compartment seam (3) has a thickness of 3 to 4 mm and is a concave structure, which is transversely arranged at a position half the height of the compartment seam (3), and the concave surface of the concave surface faces the top surface of the raft structure.

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