Tower crane foundation construction joint waterproof structure

Abstract

The utility model discloses a tower crane foundation construction joint waterproof structure which comprises a main structure raft plate reinforcing steel bar, a column lower pier, fine aggregate concrete, geotechnical cloth, an SBS waterproof layer, a waterproof layer, a concrete cushion layer, a tower crane foundation, a shallow column lower pier, an upper row of joint bars, a lower row of joint bars, a tower crane lower row of joint bars, a tower crane upper row of joint bars, a column lower pier lower row of joint bars, a grouting pipe and a water stop steel plate. Main body structure raft reinforcing steel bars are pre-poured into the tower crane foundation, the under-column piers are under-column protruding concrete bodies of a permanent raft foundation structure, the tower crane foundation and the raft structure are combined to serve as a concrete bottom plate, the grouting pipes are located in the tower crane foundation and embedded along the periphery of the tower crane, and the top face of the foundation is led out of the middle of each side. The water stop steel plate is located in the tower crane foundation and located on the top of the grouting pipe. According to the utility model, the water stop steel plate and the grouting pipe are arranged in the first-stage concrete to form a double-waterproof system, so that the installation is convenient, the waterproof guarantee is strong, and the grout injection plugging effect is good after the second-stage concrete is poured.

Description

Technical Field

[0001] This utility model relates to the technical field of waterproof structure for construction joints of tower crane foundations, and more particularly to a waterproof structure for construction joints of tower crane foundations. Background Technology

[0002] Tower cranes are widely used in building construction, and the tower crane foundation is a crucial structural element. As building height increases, so does the depth of the foundation pit, leading to greater groundwater pressure. This often results in water leakage at the joints between the concrete pier-type tower crane foundation and the surrounding raft slab concrete structure. Due to the numerous embedded reinforcing bars in the foundation, conventional water-stop steel plates are affected by the placement of the reinforcing bars and formwork, resulting in poor water-stopping effects around the foundation concrete, high maintenance costs, and difficult repairs.

[0003] Chinese patent publication number CN219862984U discloses a waterproof structure for construction joints in tower crane foundations. It includes a construction joint located between the tower crane foundation layer and the post-cast foundation layer. The tower crane foundation layer comprises an excavated pit, with a cushion layer laid on top of the pit's inner cavity. A waterproof layer is placed on top of the cushion layer, and a pre-cast concrete layer is poured on top of the waterproof layer. This invention, through the combined use of a waterproof layer and waterproof membrane, prevents water seepage from the bottom of the pit and the post-cast foundation layer. The installation of a water-stop steel plate provides initial waterproofing to the construction joint. The combined use of a construction groove, self-healing agent, water-swellable water-stop strip, and self-healing putty further enhances the waterproofing effect of the construction joint. The combined use of waterproof coating one and waterproof coating two further strengthens the waterproofing effect of the construction joint, thus achieving effective waterproofing of the tower crane foundation construction joint.

[0004] Existing waterproofing structures for tower crane foundation construction joints suffer from problems such as poor waterproofing and sealing effects, difficulty and high cost in subsequent treatment, and difficulty in completely eradicating leaks. To overcome these disadvantages, this utility model provides a waterproofing structure for tower crane foundation construction joints. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a waterproof structure for tower crane foundation construction joints.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a waterproof structure for the construction joint of a tower crane foundation, comprising: main structural raft slab reinforcement, column pier, fine aggregate concrete, geotextile, SBS waterproof layer, waterproof layer, concrete cushion layer, tower crane foundation, shallow column pier, upper row of reinforcing bars, lower row of reinforcing bars, lower row of tower crane reinforcing bars, upper row of tower crane reinforcing bars, lower row of reinforcing bars for column pier, grouting pipe, and water-stop steel plate. The main structural raft slab reinforcement is pre-cast into the tower crane foundation. The column pier is a protruding concrete body under the column of the permanent raft foundation structure, which is a secondary-stage concrete pour. The tower crane foundation is combined with the raft structure as... The concrete base slab, the shallow column piers are located at different column pier thicknesses in different raft structures, and the depth is set according to the stress difference. The lower row of tower crane reinforcement bars are located at the lower main reinforcement bars of the tower crane foundation, and the upper row of tower crane reinforcement bars are located at the upper main reinforcement bars of the tower crane foundation. The grouting pipe is located inside the tower crane foundation. The grouting pipe is buried around the tower crane, and leads out to the top surface of the foundation at the middle of each side. It is temporarily sealed with threaded plugs. After the second phase of concrete pouring is completed, the joints are grouted and leak-stopped through the reserved grouting ports. The water-stop steel plate is located inside the tower crane foundation and at the top of the grouting pipe. It is pre-embedded and anchored to the first phase of concrete, and the other half is reserved for the second phase of concrete pouring.

[0007] Furthermore, the main structural raft slab reinforcement is Φ14 steel bar, with longitudinal and transverse spacing designed according to the stress, and the anchorage length is not less than la, and the position is fixed according to the design spacing.

[0008] Furthermore, the tower crane foundation uses different steel bar diameters and spacings depending on the tower crane model, and the thickness of the tower crane foundation is 1200-1500mm.

[0009] Furthermore, the concrete cushion layer is located on top of the foundation soil and is used for leveling and laying the reinforcing bars of the raft column pier and the tower crane foundation. A waterproof layer is hot-melt laid on the concrete cushion layer, and an SBS waterproof layer is hot-laid on top of the waterproof layer. Geotextile is laid on the SBS waterproof layer, and the geotextile has a unit mass of 200g / m2.

[0010] Furthermore, the upper row of reinforcing bars is located in the upper part of the column pier structure and is inserted into the reinforcing bars of the first-phase tower crane foundation. The pre-embedded anchorage length will be tied into the second-phase reinforcing bars when the second-phase concrete is poured. The lower row of reinforcing bars is located in the lower part of the column pier structure and is inserted into the reinforcing bars of the first-phase tower crane foundation. The pre-embedded anchorage length will be tied into the second-phase reinforcing bars when the second-phase concrete is poured.

[0011] Furthermore, the reinforcing bars under the column pier are located at the lower part of the shallow column pier and are inserted into the reinforcing bars of the first-phase tower crane foundation. The pre-embedded anchorage length will be tied into the second-phase reinforcing bars when the second-phase concrete is poured.

[0012] Furthermore, the tower crane foundation has pre-embedded bolts in the middle position inside, which are used to fix the pre-embedded bolts of the tower crane column.

[0013] The beneficial effects of this utility model are:

[0014] When used, this utility model provides a waterproof structure for the construction joint of a tower crane foundation, which has the following advantages: In this design, a double waterproof system is formed by installing a water-stop steel plate and a grouting pipe in the first-stage concrete. The integrated waterproof device is easy to install, provides strong waterproofing assurance, and the grout injection after the second-stage concrete pouring has a good leak-stopping effect, improving the quality of the tower crane foundation, shortening the construction period, and reducing construction costs. Attached Figure Description

[0015] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 Top view of this utility model;

[0017] Figure 2 Cross-sectional view of this utility model;

[0018] Figure 3 The present utility model Figure 2 Enlarged view of point A in the middle.

[0019] The attached figures are labeled as follows:

[0020] 1. Main structural raft foundation reinforcement; 2. Column pier; 3. Fine aggregate concrete; 4. Geotextile; 5. SBS waterproof layer; 6. Waterproof layer; 7. Concrete cushion layer; 8. Tower crane foundation; 9. Shallow column pier; 10. Upper row of reinforcing bars; 11. Lower row of reinforcing bars; 12. Lower row of tower crane reinforcing bars; 13. Upper row of tower crane reinforcing bars; 14. Embedded bolts; 15. Lower row of reinforcing bars for column pier; 16. Grouting pipe; 17. Waterstop steel plate. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0022] like Figure 1-3As shown, a waterproof structure for the construction joint of a tower crane foundation includes: 1. Main structural raft foundation reinforcement, 2. Column base, 3. Fine aggregate concrete, 4. Geotextile, 5. SBS waterproof layer, 6. Waterproof layer, 7. Concrete cushion, 8. Tower crane foundation, 9. Shallow column base, 10. Upper row of reinforcing bars, 11. Lower row of reinforcing bars, 12. Tower crane lower row of reinforcing bars, 13. Tower crane upper row of reinforcing bars, 15. grouting pipe, 16. Waterstop steel plate, 17. The main structural raft foundation reinforcement 1 is pre-cast into the tower crane foundation 8. The column base 2 is a 500mm thick, protruding concrete body under the column of the permanent raft foundation structure, which is a secondary concrete pour. The raft foundation is 350mm thick. The tower crane foundation 8 is equipped with Φ25 reinforcing bars with a longitudinal and transverse spacing of 190mm. There are 40 of each type of tower crane. The thickness of the tower crane foundation 8 is 1350mm. The tower crane foundation 8 is combined with the raft structure as a concrete base slab. The shallow column pier 9 is 300mm high and located at the lower side of the raft structure. The lower row of reinforcing bars 12 of the tower crane is located at the lower main reinforcing bars of the tower crane foundation 8. The upper row of reinforcing bars 13 of the tower crane is located at the upper main reinforcing bars of the tower crane foundation 8. The grouting pipe 16 is located inside the tower crane foundation 8. The grouting pipe 16 is buried around the tower crane and leads out to the top surface of the foundation at the middle of each side. It is temporarily sealed with a threaded plug. After the second phase of concrete pouring is completed, the joint is grouted and leak-stopped through the reserved grouting port. The water-stop steel plate 17 is located inside the tower crane foundation 8 and at the top of the grouting pipe 16. It is pre-embedded and anchored to the first phase of concrete, and the other half is reserved for the second phase of concrete pouring.

[0023] The tower crane foundation is constructed, with the tower crane top elevation at -7.1m. The foundation is 7500mm long, 7500mm wide, and 1350mm deep. The structural raft foundation is 350mm thick, and the column pier height is 500mm, while the shallow column pier height is 300mm. A 300x3mm water-stop steel plate is designed, and Φ25 steel pipes with a wall thickness of 2.8mm are used for grouting. C40 concrete is used.

[0024] The main structure raft slab reinforcement 1 is Φ14 steel bar, with longitudinal and transverse spacing of 160mm according to the stress design, and the anchorage length is not less than 32d, and the position is fixed according to the design spacing of 160mm.

[0025] The tower crane foundation 8 uses different steel bar diameters and spacings depending on the tower crane model, and the thickness of the tower crane foundation 8 is 1200-1500mm.

[0026] A 100mm thick C15 concrete cushion layer 7 is used. The concrete cushion layer 7 is located on top of the foundation soil. The concrete cushion layer 7 is poured on top after the foundation soil layer is inspected. It is used for leveling and laying the raft foundation column pier reinforcement and tower crane foundation reinforcement. A waterproof layer 6 with a thickness of 4mm is hot-melted and laid on the concrete cushion layer 7. An SBS waterproof layer 5 with a thickness of 4mm is hot-laid on top of the waterproof layer 6. The hot-laid overlap width of the SBS waterproof layer 5 is 100mm. Geotextile 4 with a unit mass of 200g / m2 is laid on the SBS waterproof layer 5.

[0027] The upper row of 10Φ14 reinforcing bars is located in the upper part of the column pier structure and is inserted into the Φ14 reinforcing bars of the first phase tower crane foundation 8. The pre-embedded anchorage length will be tied into the second phase reinforcing bars when the second phase concrete is poured. The lower row of 11Φ20 reinforcing bars is located in the lower part of the column pier structure and is inserted into the reinforcing bars of the first phase tower crane foundation 8. The pre-embedded anchorage length is 32d and will be tied into the second phase reinforcing bars when the second phase concrete is poured.

[0028] The lower row of reinforcing bars (12) of the tower crane consists of 40 Φ25 steel bars, spaced 190mm apart, with a protective layer thickness of 50mm. The upper row of reinforcing bars (13) of the tower crane consists of 40 Φ25 steel bars, spaced 190mm apart, with a protective layer thickness of 50mm. A Φ16 tie bar is installed every two rows.

[0029] The bottom row of reinforcing bars 15 under the column pier is located at the lower part of the shallow column pier 9 and is inserted into the steel bars of the first phase tower crane foundation 8. The pre-embedded anchorage length will be tied into the second phase steel bars when the second phase concrete is poured.

[0030] An embedded bolt 14 is installed in the middle of the tower crane foundation 8 to fix the bolts embedded in the tower crane column. The embedded bolt 14 is a Q235B or M45 bolt.

[0031] Working Principle: During operation, a waterproof base layer is first installed, followed by the pouring of reinforced concrete for the tower crane foundation. A water-stop steel plate is then embedded, and grouting pipes are placed. After the second-phase concrete pouring is completed, grouting is performed through designated grouting ports to seal the joints. By using a tower crane foundation within a deep foundation pit, this method addresses the issue of water leakage at the joints between the concrete tower crane foundation and the surrounding raft structure concrete when groundwater pressure increases. It avoids the difficulties, high costs, and difficulty in completely eradicating leaks in the first and second-phase concrete sections. The use of a water-stop steel plate and grouting pipes in the first-phase concrete creates a double waterproofing system. Installation is convenient, waterproofing is highly reliable, and the grout injection after the second-phase concrete pouring provides excellent sealing results, high-quality sealing, shorter construction time, and increased efficiency.

[0032] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A waterproof structure for construction joints of tower crane foundations, characterized in that, include: The main structure includes raft foundation reinforcement (1), column piers (2), fine stone concrete (3), geotextile (4), SBS waterproof layer (5), waterproof layer (6), concrete cushion layer (7), tower crane foundation (8), shallow column piers (9), upper row of reinforcing bars (10), lower row of reinforcing bars (11), lower row of tower crane reinforcing bars (12), upper row of tower crane reinforcing bars (13), lower row of reinforcing bars for column piers (15), grouting pipe (16), and water-stop steel plate (17). The main structure raft foundation reinforcement (1) is pre-cast into the tower crane foundation (8). The column piers (2) are protruding concrete bodies under the columns of the permanent raft foundation structure, which are second-stage concrete pours. The tower crane foundation (8) is combined with the raft structure as a concrete base slab. The shallow column pier (9) is located at the column pier thickness of different raft structures, and the depth is set according to the stress difference. The tower crane lower reinforcement (12) is located at the lower main reinforcement of the tower crane foundation (8). The tower crane upper reinforcement (13) is located at the upper main reinforcement of the tower crane foundation (8). The grouting pipe (16) is located inside the tower crane foundation (8). The grouting pipe (16) is buried around the tower crane, and leads out to the top surface of the foundation at the middle of each side. It is temporarily sealed with a thread plug. After the second phase of concrete pouring is completed, the joint is grouted and leak-stopped through the reserved grouting port. The water-stop steel plate (17) is located inside the tower crane foundation (8) and at the top of the grouting pipe (16). It is pre-embedded and anchored to the first phase of concrete, and the other half is reserved for pouring the second phase of concrete.

2. The waterproof structure for construction joints of tower crane foundations according to claim 1, characterized in that: The main structure raft slab reinforcement (1) is Φ14 steel bar, with longitudinal and transverse spacing according to the stress design, and the anchorage length is not less than la, and the position is fixed according to the design spacing.

3. The waterproof structure for construction joints of tower crane foundations according to claim 1, characterized in that: The tower crane foundation (8) adopts different steel bar diameters and spacings depending on the tower crane model, and the thickness of the tower crane foundation (8) is 1200-1500mm.

4. The waterproof structure for construction joints of tower crane foundations according to claim 1, characterized in that: The concrete cushion layer (7) is located on top of the foundation soil and is used for leveling and laying the reinforcing bars of the raft column pier and the tower crane foundation. A waterproof layer (6) is hot-melted on the concrete cushion layer (7). An SBS waterproof layer (5) is hot-laid on top of the waterproof layer (6). A geotextile (4) is laid on the SBS waterproof layer (5). The geotextile (4) has a unit mass of 200g / m2.

5. A waterproof structure for construction joints of tower crane foundations according to claim 1, characterized in that: The upper row of reinforcing bars (10) is located in the upper part of the column pier structure and is inserted into the reinforcing bars of the first-phase tower crane foundation (8). The pre-embedded anchorage length will be tied into the second-phase reinforcing bars when the second-phase concrete is poured. The lower row of reinforcing bars (11) is located in the lower part of the column pier structure and is inserted into the reinforcing bars of the first-phase tower crane foundation (8). The pre-embedded anchorage length will be tied into the second-phase reinforcing bars when the second-phase concrete is poured.

6. A waterproof structure for construction joints of tower crane foundations according to claim 1, characterized in that: The column under pier bottom bar (15) is located at the bottom of the shallow column under pier (9) and is inserted into the steel bar of the first phase tower crane foundation (8). The pre-embedded anchorage length will be tied into the second phase steel bar when the second phase concrete is poured.

7. A waterproof structure for construction joints of tower crane foundations according to claim 1, characterized in that: The tower crane foundation (8) has a pre-embedded bolt (14) in the middle position inside, which is used to fix the pre-embedded bolts of the tower crane column.

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