Tower crane foundation and basement foundation combined construction structure and construction method

Abstract

The invention discloses a tower crane foundation and basement foundation combined construction structure and method. The tower crane foundation and basement foundation combined construction structure comprises a basement foundation and a tower crane foundation. The foundation pit is divided into upper and lower layers; the tower crane foundation is located in the lower-layer foundation pit, and the top of the tower crane foundation extends to the upper-layer foundation pit; the basement foundation is located in the upper-layer foundation pit, and the upper surface of the basement foundation is flush with the upper surface of the tower crane foundation; the tower crane foundation and the surrounding basement foundations are integrally poured and formed; a plurality of pile foundations are arranged in the foundation of the lower-layer foundation pit at intervals, and the top ends of the pile foundations extend into the tower crane foundation; the bottom ends of the tower crane embedded supporting legs are embedded in the tower crane foundation, and the top ends of the tower crane embedded supporting legs protrude out of the upper surface of the lifting foundation and are connected with an external tower crane. The cushion layer is laid at the bottoms of the lower-layer foundation pit and the upper-layer foundation pit, and the brick blank film is built on the side wall of the lower-layer foundation pit; the waterproof structure is laid on the surface of the cushion layer and the brick blank film, located among the foundation pit, the basement foundation and the tower crane foundation and integrated. The concrete consumption is greatly reduced, and the overall waterproof quality is improved; in addition, the tower crane foundation and the basement are high in structural integrity, and the tower crane is safe, reliable and high in applicability after being installed.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a construction structure and a construction method combining a tower crane foundation and a basement foundation. Background Art

[0002] At present, tower crane foundations generally adopt rectangular independent foundations, which are set under the foundation slab, and the foundation size is huge. Especially when the groundwater level is high, the dewatering project needs to be increased and the depth needs to be lowered than normal.

[0003] Common tower crane foundations are set under basement foundations. Because of this practice, there is no need to consider basement foundation construction. The tower crane foundation can be constructed in advance and the tower crane can be installed, which is beneficial to the overall construction progress.

[0004] But there are also the following defects:

[0005] 1. The amount of concrete used is large. The amount of concrete used for a single tower crane foundation is large. It is not combined with the basement foundation, resulting in a waste of materials. In addition, the tower crane foundation is buried deep and requires pre-buried foundation sections. The cost of pre-buried foundation sections is higher than that of pre-buried legs.

[0006] 2. The excavation depth of the foundation pit is large. The depth of the tower crane foundation is generally more than 1.5m. Together with the depth of the basement foundation pit, the depth of the foundation pit exceeds 5m. The foundation pit needs special design and expert demonstration. Affected by the groundwater level, if the foundation pit is not dewatered properly, the tower crane foundation pit is prone to collapse, and the construction of the tower crane foundation brick formwork is difficult;

[0007] 3. The tower crane foundation is set at the bottom of the basement foundation. The waterproof construction of the tower crane foundation is difficult, and it is difficult to form a skin-type waterproof layer, forming a weak point in the basement waterproofing, which is difficult to deal with after water seepage occurs;

[0008] 4. The tower crane foundation is set at the bottom of the basement foundation. The integrity of the tower crane foundation and the basement foundation is poor, the structure is prone to uneven settlement, the tower crane has poor safety and stability, and after uneven settlement, the cracks between the structures are difficult to deal with, increasing manpower and material resources. Summary of the invention

[0009] In view of the above-mentioned defects in the prior art, a construction structure and a construction method combining a tower crane foundation and a basement foundation are provided, which can save a large amount of concrete and improve the overall waterproof quality. In addition, the tower crane foundation and the basement structure have strong integrity, and the tower crane is safe, reliable and highly applicable after installation.

[0010] The technical solution adopted by the present invention to solve the above technical problems is:

[0011] First, the construction structure combining the tower crane foundation and the basement foundation includes the basement foundation and the tower crane foundation;

[0012] The foundation pit is divided into two layers, the lower foundation pit is located directly below the upper foundation pit; the tower crane foundation is located in the lower foundation pit, and the top of the tower crane foundation extends to the upper foundation pit; the basement foundation is located in the upper foundation pit, and the upper surface of the basement foundation is flush with the upper surface of the tower crane foundation; the tower crane foundation and the surrounding basement foundation are cast in one piece;

[0013] Pile foundation and tower crane embedded legs: a plurality of pile foundations are arranged at intervals in the foundation of the lower foundation pit, and the top of the pile foundation extends into the tower crane foundation; the bottom end of the tower crane embedded legs is buried in the tower crane foundation, and the top end of the tower crane embedded legs protrudes from the upper surface of the lifting foundation and is connected to the external tower crane;

[0014] The cushion layer, waterproof structure and brick formwork, the cushion layer is laid on the bottom of the lower foundation pit and the upper foundation pit, and the brick membrane is built on the side wall of the lower foundation pit; the waterproof structure is laid on the cushion layer surface and the brick membrane, the waterproof structure is located between the foundation pit and the basement foundation and the tower crane foundation, and the waterproof structure is a whole.

[0015] According to the above technical solution, the width of the basement foundation cast together with the tower crane foundation shall not be less than 1.5m.

[0016] According to the above technical scheme, a waterstop steel plate is arranged between the basement foundation cast together with the tower crane foundation and the basement foundation cast subsequently. The waterstop steel plate has a ring structure. The waterstop steel plate includes a strip waterstop steel plate and a corner shaped waterstop steel plate.

[0017] According to the above technical solution, the top surface of the pile foundation is 50mm higher than the bottom surface of the tower crane foundation; the pile foundations are distributed at intervals within the range of the tower crane foundation, and the straight-line distance between the central axis of the pile foundation and the edge of the tower crane foundation is ≥500mm.

[0018] According to the above technical solution, a water retaining platform is provided on the ground around the foundation pit, and a gravel blind ditch is provided on the outer periphery of the upper foundation pit located at the basement foundation.

[0019] Secondly, the construction method combining the tower crane foundation and the basement foundation is that when the foundation pit is excavated, the foundation pit is excavated twice, the first excavation is to the design elevation of the basement foundation excavation, and the second excavation is to the design elevation of the tower crane foundation excavation;

[0020] After the waterproof structure construction is completed, the steel bars of the tower crane foundation and the basement foundation within the set range around the tower crane foundation are tied, and the embedded legs of the tower crane are installed on the steel cage of the tower crane foundation; then the tower crane foundation and the basement foundation within the set range around the tower crane foundation are cast together.

[0021] According to the above technical scheme, the waterproof structure construction includes the waterproof construction of pile foundation head, the waterproof reinforcement layer construction of corners, the large surface waterproof construction of tower crane foundation and basement foundation, and the brick membrane waterproof construction; the construction of all the above areas will make the waterproof structure of the basement foundation and tower crane foundation a whole.

[0022] According to the above technical solution, after the concrete poured in the tower crane foundation reaches 80% of the concrete compressive strength, the tower crane is installed on the pre-embedded legs of the tower crane;

[0023] After the tower crane is put into use, a stepped notch is chiseled out of the concrete within the range of the embedded legs, and the embedded legs of the tower crane in the notch are cut off; then the notch is poured with micro-expansive fine stone concrete that is one grade higher than the basement foundation; finally, the basement surface layer is constructed on the basement foundation and the tower crane foundation.

[0024] According to the above technical scheme, before the foundation pit is excavated, a dewatering well needs to be dug within the scope of the lower foundation pit to reduce the water content of the foundation below the lower foundation pit through the dewatering well; the water level in the dewatering well is guaranteed to be 0.5m to 1m below the design elevation of the tower crane foundation excavation.

[0025] According to the above technical scheme, before the foundation pit is excavated, the pile foundation is constructed within the range of the tower crane foundation, and a circle of water retaining platforms is set around the foundation pit; after the upper foundation pit is excavated, a circle of gravel blind ditch is set at the bottom of the foundation pit slope of the upper foundation pit; after the lower foundation pit is excavated, brick membranes are immediately built on the side walls around the tower crane foundation.

[0026] The present invention has the following beneficial effects:

[0027] 1. The tower crane foundation and basement foundation are constructed in the same foundation pit. The tower crane foundation is set within the basement foundation. The tower crane foundation and the basement foundation around it are cast together to form an integrated structure. Pile foundations and embedded legs are set on the tower crane foundation to provide support for the tower crane and to install the tower crane. When the tower crane is not in use, the tower crane foundation is used as part of the basement foundation, and the basement floor is constructed on the tower crane foundation and the basement foundation.

[0028] Firstly, compared with the tower crane foundation built at the bottom of the basement foundation, the top of the tower crane foundation is flush with the top of the basement foundation, which can reduce the amount of concrete used and save a lot of concrete.

[0029] Secondly, since the tower crane foundation and the surrounding basement foundation are cast together, the waterproof structure at the bottom of the basement foundation and the tower crane foundation can be constructed together, which can ensure that the entire waterproof structure is a whole, thereby achieving the purpose of improving the overall waterproof performance.

[0030] Thirdly, since the tower crane foundation is no longer an independent existence in the prior art, it is a whole with the basement foundation, so that the tower crane foundation and the basement structure have strong integrity, ensuring that the tower crane is safe and reliable after installation, and has stronger applicability.

[0031] 2. Before excavation, a water retaining platform is arranged on the top of the foundation pit to block rainwater from flowing into the basement pit. Gravel blind ditches are arranged around the bottom of the basement pit slope to meet the drainage needs of rainy season and foundation pit drainage. The excavation range should be 2m outside the concrete cushion layer of the basement foundation to avoid contamination of the cushion layer.

[0032] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. The specific implementation of the present invention is given in detail by the following embodiments and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings described herein are used to provide further understanding of the present invention and constitute a part of this application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0034] Figure 1 The invention provides a method for pressure sinking piles and earth excavation;

[0035] Figure 2 The present invention provides an embodiment of the present invention for the brick membrane masonry and cushion layer pouring in the foundation pit of the tower crane;

[0036] Figure 3 The pile head waterproofing of the embodiment provided by the present invention;

[0037] Figure 4 The tower crane foundation waterproofing of the embodiment provided by the present invention;

[0038] Figure 5 The present invention provides an embodiment of the tower crane embedded legs installation, and the tower crane foundation and part of the basement foundation steel bar binding;

[0039] Figure 6 The installation diagram of the water stop steel plate provided in the embodiment of the present invention is Figure 1 ;

[0040] Figure 7 The installation diagram of the water stop steel plate provided in the embodiment of the present invention is Figure 2 ;

[0041] Figure 8 The invention provides a tower crane foundation and part of the basement foundation concrete pouring and construction joint treatment;

[0042] Fig. 9The invention provides a step-type chiseling and tower crane embedded parts cutting embodiment;

[0043] Fig.10 The invention provides a step-shaped groove concrete repair and surface layer construction embodiment;

[0044] In the figure, 1. Basement foundation; 1-1. Basement foundation cast together with tower crane foundation; 1-2. Basement foundation cast subsequently; 2. Tower crane foundation; 3. Foundation pit; 4. Pile foundation; 5. Pre-buried legs of tower crane; 6. Foundation; 7. Pad layer; 8. Waterproof structure; 8-1. Waterproof reinforcement layer of tower crane foundation positive corner; 8-2. Waterproof reinforcement layer of tower crane foundation negative corner; 8-3. Waterproof layer of brick membrane; 8-4. Waterproof membrane of bottom plate; 8-5. Waterproof membrane of bottom plate; 8-6. Water-expanding water-stop ring; 8-7. Waterproof Mortar; 8-8, cement-based penetrating crystallization waterproof coating; 8-9, polysulfide sealant waterproofing paste; 8-10, non-curing asphalt waterproof coating; 9, brick formwork; 9-1, brick formwork plastering; 10, basement floor; 11, waterstop steel plate; 11-1, strip waterstop steel plate; 11-2, corner shaped waterstop steel plate; 12, water retaining platform; 13, gravel blind ditch; 14, stepped notch; 15, foundation pit slope; 16, internal corner; 17, external corner; 18, steel bars; 19, construction joint; 20, quick-and-easy closing net. DETAILED DESCRIPTION

[0045] The following is combined with Figure 1-10 The principles and features of the present invention are described, and the examples are only used to explain the present invention and are not used to limit the scope of the present invention. In the following paragraphs, the present invention is described in more detail by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become clearer according to the following description and claims. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to facilitate and clearly assist in explaining the purpose of the embodiments of the present invention.

[0046] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0048] Reference Figures 1 to 10 As shown, the construction structure provided by the present invention combines a tower crane foundation with a basement foundation.

[0049] Example 1

[0050] Including basement foundation 1 and tower crane foundation 2; also includes

[0051] Foundation pit 3, the foundation pit is divided into two layers, the lower foundation pit is located directly below the upper foundation pit; the tower crane foundation is located in the lower foundation pit, and the top of the tower crane foundation extends to the upper foundation pit; the basement foundation is located in the upper foundation pit, and the upper surface of the basement foundation is flush with the upper surface of the tower crane foundation; the tower crane foundation and the surrounding basement foundation are cast in one piece;

[0052] Pile foundation 4 and tower crane embedded legs 5, a plurality of pile foundations are arranged in the foundation 6 of the lower foundation pit, and the top of the pile foundation extends into the tower crane foundation; the bottom end of the tower crane embedded legs is buried in the tower crane foundation, and the top end of the tower crane embedded legs protrudes from the upper surface of the lifting foundation and is connected to the external tower crane;

[0053] The cushion layer 7, the waterproof structure 8 and the brick formwork 9, the cushion layer is laid on the bottom of the lower foundation pit and the upper foundation pit, and the brick membrane is built on the side wall of the lower foundation pit; the waterproof structure is laid on the cushion layer surface and the brick membrane, and the waterproof structure is located between the foundation pit and the basement foundation and the tower crane foundation, and the waterproof structure is a whole.

[0054] In this embodiment, the construction of the tower crane foundation and the basement foundation is carried out in the same foundation pit. The tower crane foundation is set within the range of the basement foundation, and the tower crane foundation and the basement foundation around it are cast together to form an integrated structure. Pile foundations and embedded legs are set on the tower crane foundation to provide support for the tower crane and to be used for installing the tower crane. After the tower crane is not in use, the tower crane foundation is used as part of the basement foundation, and the basement floor 10 is constructed on the tower crane foundation and the basement foundation.

[0055] 1. Compared with the tower crane foundation built at the bottom of the basement foundation, the top of the tower crane foundation is flush with the top of the basement foundation, which can reduce the amount of concrete used and save a lot of concrete.

[0056] 2. Since the tower crane foundation and the surrounding basement foundation are cast together, the waterproof structure at the basement foundation and the bottom of the tower crane foundation can be constructed together. This ensures that the entire waterproof structure is a whole, thereby achieving the purpose of improving the overall waterproof performance.

[0057] 3. Since the tower crane foundation is no longer an independent existence in the existing technology, it is a whole with the basement foundation, so that the tower crane foundation and the basement structure have strong integrity, ensuring that the tower crane is safe and reliable after installation, and has stronger applicability.

[0058] Example 2

[0059] The structure and principle of Example 2 are similar to those of Example 1, except that in order to ensure the integrity between the tower crane foundation and the basement foundation, the width of the basement foundation 1-1 cast together with the tower crane foundation is not less than 1.5 m.

[0060] Example 3

[0061] The structure and principle of Example 3 are similar to those of Example 1, except that: in order to improve the waterproof performance of the basement foundation, a water-stop steel plate 11 is provided between the basement foundation cast together with the tower crane foundation and the basement foundation 1-2 cast subsequently, and the water-stop steel plate is annular in structure; the water-stop steel plate includes a strip-shaped water-stop steel plate 11-1 and a corner-shaped water-stop steel plate 11-2. The overlap length between the water-stop steel plates is not less than 50 mm, and 100 mm is used in the figure.

[0062] Example 4

[0063] The structure and principle of Example 4 are similar to those of Example 1, except that: in order to ensure the bearing capacity of the tower crane foundation, the top surface of the pile foundation is 50 mm higher than the bottom surface of the tower crane foundation; the pile foundations are spaced within the range of the tower crane foundation, and the straight-line distance between the center axis of the pile foundation and the edge of the tower crane foundation is ≥500 mm.

[0064] Example 5

[0065] The structure and principle of Example 5 are similar to those of Example 1, except that: in order to improve the overall drainage performance of the construction structure during the construction process, a water retaining platform 12 is provided on the ground around the foundation pit, and a gravel blind ditch 13 is provided on the outer periphery of the upper foundation pit at the basement foundation.

[0066] The invention also provides a construction method combining a tower crane foundation and a basement foundation.

[0067] Example 1

[0068] When excavating the foundation pit, the foundation pit is excavated twice. The first excavation is to the design elevation of the basement foundation excavation, and the second excavation is to the design elevation of the tower crane foundation excavation.

[0069] After the waterproof structure is constructed, the steel bars 18 of the tower crane foundation and the basement foundation within the set range around the tower crane foundation are tied, and the pre-buried legs of the tower crane are installed on the steel cage of the tower crane foundation; then the tower crane foundation and the basement foundation within the set range around the tower crane foundation are cast together.

[0070] In Example 1, the waterproof structure construction includes the waterproof construction of the pile foundation, the waterproof reinforcement layer construction of the inner corner 16 and the outer corner 17, the large surface waterproof construction of the tower crane foundation and the basement foundation, and the brick membrane waterproof construction; the construction of all the above areas forms the waterproof structure of the basement foundation and the tower crane foundation into a whole.

[0071] Example 2

[0072] The structure and principle of Example 2 are similar to those of Example 1, except that: after the concrete poured into the tower crane foundation reaches 80% of the concrete compressive strength, the tower crane is installed on the pre-embedded legs of the tower crane;

[0073] After the tower crane is used, a stepped notch 14 is chiseled out of the concrete in the range of the embedded legs, and the embedded legs of the tower crane in the notch are cut off; then the notch is poured with micro-expansive fine stone concrete one grade higher than the basement foundation; finally, the basement surface layer is constructed on the basement foundation and the tower crane foundation.

[0074] Example 3

[0075] The structure and principle of Example 3 are similar to those of Example 1, except that in order to prevent the foundation at the bottom of the tower crane foundation from collapsing after the construction of the tower crane foundation, a dewatering well shall be drilled within the scope of the lower foundation pit before excavation of the foundation pit, and the water content of the foundation below the lower foundation pit shall be reduced through the dewatering well. The water level in the dewatering well shall be guaranteed to be 0.5m to 1m below the design elevation of the tower crane foundation excavation.

[0076] In Examples 1-3, it is preferred that before excavating the foundation pit, pile foundation construction is carried out within the range of the tower crane foundation, and a circle of water retaining platforms is set around the foundation pit to block rainwater from flowing into the foundation pit; after the upper foundation pit is excavated, a circle of gravel blind ditch is set at the bottom of the foundation pit slope 15 of the upper foundation pit to meet the drainage needs of the rainy season and the foundation pit; after the lower foundation pit is excavated, brick membranes are immediately built on the side walls around the tower crane foundation, and the thickness of the brick membrane should be determined in combination with the depth of the tower crane foundation.

[0077] Based on the construction method combining tower crane foundation and basement foundation, a construction process for a specific construction project is given. The steps are as follows:

[0078] S1: Pile foundation construction of tower crane foundation. The size, pile foundation form, pile length, steel bar spacing and steel bar model of the tower crane foundation need to be designed and calculated to meet the tower crane bearing capacity requirements. The pile foundation of the tower crane foundation is the same as the basement foundation pile foundation. The concrete of the tower crane foundation is the same as the basement foundation concrete or one grade higher, and impermeable concrete is used. The tower crane pile foundation is arranged below the tower crane foundation, generally 4 piles, the straight-line distance between the central axis of the pile foundation and the edge of the tower crane foundation is ≥500mm, and the top surface of the pile foundation is 50mm higher than the bottom surface of the tower crane foundation; thereby ensuring the integrity of the pile foundation and the tower crane foundation, and the steel bar protective layer on the bottom surface of the tower crane foundation can be controlled.

[0079] S2: Excavation of foundation pit. Before excavation of foundation pit, a drainage well is set within the design range of tower crane foundation to ensure that the water level in the drainage well is 0.5m to 1m below the design elevation of tower crane foundation excavation. Before excavation of foundation pit earthwork, a water retaining platform is arranged on the top of the foundation pit to block rainwater from flowing into the foundation pit. The slope of the earthwork excavation slope should meet the requirements of the specification according to the depth of the foundation pit, soil conditions, etc. The earthwork is excavated in two times, and each excavation should be layered and symmetrical to avoid over-excavation. The first mechanical combined with manual excavation to the design elevation of the basement foundation excavation (i.e., the bottom of the concrete cushion layer of the basement foundation), and gravel blind ditches are arranged around the bottom of the slope to meet the needs of drainage during rainy season and foundation pit drainage. The second manual excavation is to the design elevation of the tower crane foundation excavation (i.e., the bottom of the concrete cushion layer of the tower crane foundation), and attention should be paid to the finished product protection of the pile foundation during manual excavation. The top surface of the tower crane foundation and the top surface of the basement foundation are at the same height. The excavation range should be 2m outside the concrete cushion layer of the basement foundation to avoid contamination of the cushion layer.

[0080] S3: Laying of cushion layer and laying of brick membrane. After the excavation of the tower crane foundation is completed, the brick formwork is built around the lower foundation pit corresponding to the tower crane foundation as soon as possible. The thickness of the brick formwork should be determined in combination with the depth of the tower crane foundation. In combination with the pile foundation form, the bored piles are treated with pile heads, and the precast piles are treated with core filling. The earthwork of the foundation pit is leveled. After the foundation elevation is verified to meet the requirements, the concrete cushion layer of the tower crane foundation and the basement foundation is poured. The concrete cushion layer is 100mmC20 fine stone concrete, and its thickness and flatness are strictly controlled during the pouring process. After the concrete cushion layer reaches the working strength of people, the brick formwork is plastered and the arc plastering of the positive and negative corners of the tower crane foundation is carried out to ensure close contact between the waterproof layer and the tower crane foundation cushion layer to avoid hollowing. The construction scope of the concrete cushion layer should be 1.5m outside the waterproof stubble of the waterproof structure to ensure that the waterproof overlap and the tower crane foundation reinforcement are thrown to the cushion layer and do not directly contact the foundation.

[0081] S4: Construction of waterproof structure.

[0082] After the concrete cushion reaches the design strength, the pile head waterproofing construction is carried out. First, the pile head is cleaned, the pile head floating slurry is removed, and the pile head is moistened with atomizing equipment. No visible water is allowed. Apply two coats of cement-based penetrating crystalline waterproof coating, and the application range is within 150mm diameter of the pile head and the surrounding area. Apply a layer of 3mm thick waterproof mortar, and the range is within 300mm diameter of the pile head and the surrounding area.

[0083] First, waterproof reinforcement layer is constructed for the inner and outer corners of the tower crane foundation, and then waterproofing of the tower crane foundation and basement foundation is carried out. The waterproof materials are non-curing asphalt waterproof coating and pre-laid anti-adhesive waterproof membrane.

[0084] The waterproofing membrane of the basement floor should be pre-laid outward for more than 1.5m at the horizontal construction joint 17 (the gap between the basement foundation connected to the tower crane foundation and the later poured basement foundation) to ensure that after the tower crane foundation is poured, the basement waterproofing construction overlaps the working surface. The large surface waterproofing membrane of the tower crane foundation and the basement foundation, the waterproofing pre-laid reverse-adhesive waterproofing membrane can reduce the waterproofing protective layer process, and ensure that the waterproofing membrane is better combined with the concrete structure, and improve the impermeability of the tower crane foundation. The waterproof layer in the basement foundation is sealed with polysulfide sealing paste at the pile head to ensure the integrity of the waterproofing. As shown in the figure, the waterproof structure includes the tower crane foundation positive corner waterproofing reinforcement layer 8-1; the tower crane foundation negative corner waterproofing reinforcement layer 8-2; the brick tire membrane waterproofing layer 8-3; the basement waterproofing membrane stubble 8-4. The waterproof structure at the pile head of the pile foundation includes the following base plate waterproofing membrane 8-5; water-expanding water stop ring 8-6; waterproof mortar 8-7; cement-based penetrating crystallization waterproof coating 8-8; polysulfide sealing paste waterproofing 8-9; and non-curing asphalt waterproof coating 8-10.

[0085] S5: Tie up the steel bars of the tower crane foundation and part of the basement foundation, and install the pre-buried legs of the tower crane. A horizontal construction joint is set between the basement foundation connected to the tower crane foundation and the post-cast basement foundation, and a water-stop steel plate is pre-buried in the construction joint. The spacing and size of the steel bars of the tower crane foundation and the basement foundation connected to the tower crane foundation should be obtained through calculation. The pre-buried legs of the tower crane should be installed during the steel bar tying process of the tower crane foundation. To ensure the integrity between the tower crane foundation and the basement foundation, the post-cast basement foundation can be pre-tied with steel bars within a range of 1.5m. Leave a horizontal construction joint on the basement floor, set a water-stop steel plate in the middle of the construction joint, and fix the water-stop steel plate to the steel bars by welding. Quick and easy closing nets 20 are set above and below the water-stop steel plate, and corner-shaped water-stop steel plates are used at the corners. The lap length between the water-stop steel plates is 100mm, and double-sided full welding is used. The basement foundation reinforcement should meet the standard lap requirements.

[0086] S6: Concrete pouring of tower crane foundation and part of basement foundation, construction joint treatment. The concrete poured for tower crane foundation and part of basement foundation shall be the same as or one grade higher than the concrete of basement foundation poured later. The construction joints shall be roughened, cleaned and wetted with water. The basement floor within the range of the post-cast zone shall be reinforced and concrete poured.

[0087] S7: Installation and removal of tower crane. The tower crane is installed after the tower crane foundation reaches 80% of the concrete compressive strength. After the tower crane is used, it is dismantled, and a stepped notch is chiseled out of the concrete between the tower crane's embedded legs and the tower crane foundation, and the legs are cut off. After the tower crane's embedded legs are cut off, a stepped notch is chiseled out of the concrete within the embedded legs. The notch is 50mm deep and 50mm wide around the legs. The tower crane's embedded legs are cut off.

[0088] S8: Chisel and clean the stepped notches, apply waterproof high-strength concrete grouting material, and finally pour with a higher grade of micro-expansion fine stone concrete. After reaching the designed strength, the basement surface layer construction is carried out. Avoid steel bar corrosion and foundation cracking caused by exposed tower crane legs

[0089] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any ordinary technician in the industry can smoothly implement the present invention as shown in the drawings and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. The construction structure combining the tower crane foundation and the basement foundation includes the basement foundation and the tower crane foundation; it is characterized by: Also includes The foundation pit is divided into two layers, the lower foundation pit is located directly below the upper foundation pit; the tower crane foundation is located in the lower foundation pit, and the top of the tower crane foundation extends to the upper foundation pit; the basement foundation is located in the upper foundation pit, and the upper surface of the basement foundation is flush with the upper surface of the tower crane foundation; the tower crane foundation and the surrounding basement foundation are cast in one piece; Pile foundation and tower crane embedded legs: a plurality of pile foundations are arranged at intervals in the foundation of the lower foundation pit, and the top of the pile foundation extends into the tower crane foundation; the bottom end of the tower crane embedded legs is buried in the tower crane foundation, and the top end of the tower crane embedded legs protrudes from the upper surface of the lifting foundation and is connected to the external tower crane; The cushion layer, waterproof structure and brick formwork, the cushion layer is laid on the bottom of the lower foundation pit and the upper foundation pit, and the brick membrane is built on the side wall of the lower foundation pit; the waterproof structure is laid on the cushion layer surface and the brick membrane, the waterproof structure is located between the foundation pit and the basement foundation and the tower crane foundation, and the waterproof structure is a whole.

2. The construction structure combining a tower crane foundation and a basement foundation according to claim 1 is characterized in that: The width of the basement foundation cast together with the tower crane foundation shall not be less than 1.5m.

3. The construction structure combining a tower crane foundation and a basement foundation according to claim 1 or 2 is characterized in that: A waterstop steel plate is arranged between the basement foundation cast together with the tower crane foundation and the basement foundation cast subsequently. The waterstop steel plate has a ring structure. The waterstop steel plate includes a strip waterstop steel plate and a corner shaped waterstop steel plate.

4. The construction structure combining a tower crane foundation and a basement foundation according to claim 1 is characterized in that: The top surface of the pile foundation is 50mm higher than the bottom surface of the tower crane foundation; the pile foundations are distributed at intervals within the range of the tower crane foundation, and the straight-line distance between the central axis of the pile foundation and the edge of the tower crane foundation is ≥500mm.

5. The construction structure combining a tower crane foundation and a basement foundation according to claim 1 is characterized in that: A water retaining platform is provided on the ground around the foundation pit, and a gravel blind ditch is provided on the outer periphery of the upper foundation pit located at the basement foundation.

6. The construction method combining tower crane foundation and basement foundation is characterized by: When excavating the foundation pit, the foundation pit is excavated twice. The first excavation is to the design elevation of the basement foundation excavation, and the second excavation is to the design elevation of the tower crane foundation excavation. After the waterproof structure is completed, the steel bars of the tower crane foundation and the basement foundation within the set range around the tower crane foundation are tied, and the pre-buried legs of the tower crane are installed on the steel cage of the tower crane foundation; Then the tower crane foundation and the basement foundation within the set range around the tower crane foundation are cast together.

7. The construction method of combining a tower crane foundation with a basement foundation according to claim 1 is characterized in that: The waterproof structure construction includes the waterproof construction of pile foundation, the waterproof reinforcement layer construction of the corners, the large surface waterproof construction of the tower crane foundation and the basement foundation, and the brick membrane waterproof construction; the construction of all the above areas will make the waterproof structure of the basement foundation and the tower crane foundation a whole.

8. The construction method of combining a tower crane foundation with a basement foundation according to claim 1 is characterized in that: After the concrete poured in the tower crane foundation reaches 80% of the concrete compressive strength, install the tower crane on the pre-embedded legs of the tower crane; After the tower crane is put into use, a stepped notch is chiseled out of the concrete within the range of the embedded legs, and the embedded legs of the tower crane in the notch are cut off; then the notch is poured with micro-expansive fine stone concrete that is one grade higher than the basement foundation; finally, the basement surface layer is constructed on the basement foundation and the tower crane foundation.

9. The construction method of combining a tower crane foundation with a basement foundation according to claim 1, characterized in that: Before excavation of the foundation pit, a dewatering well shall be built within the scope of the lower foundation pit to reduce the water content of the foundation below the lower foundation pit; the water level in the dewatering well shall be guaranteed to be 0.5m to 1m below the design elevation of the tower crane foundation excavation.

10. The construction method combining a tower crane foundation and a basement foundation according to claim 1, characterized in that: Before excavation of the foundation pit, pile foundation is constructed within the range of the tower crane foundation, and a circle of water retaining platform is set up around the foundation pit; after excavation of the upper foundation pit, a circle of gravel blind ditch is set up at the bottom of the foundation slope of the upper foundation pit; after excavation of the lower foundation pit, brick membrane is immediately built on the side walls around the tower crane foundation.

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