Cantilever structure adopting bracket-free construction

Abstract

The cantilever structure comprises a plurality of pile foundations, a bearing platform, structural steel and a cantilever part, the bottoms of the pile foundations are deeply buried in the foundations, the tops of the pile foundations are exposed out of the foundations, the bearing platform is arranged at the tops of the pile foundations, and the structural steel is arranged at intervals in the length direction of the bearing platform. One end of each structural steel is vertically pre-buried in the bearing platform, the other end of each structural steel is overhung outwards in the direction deviating from the bearing platform to form an overhanging end, and the overhanging part is arranged at the overhanging end. According to the utility model, the construction of erecting a bracket on the sea is avoided, so that the bracket cost is saved, the safety and reliability are realized, the construction period is short, the influence on the surrounding environment is small, and obvious economic benefits and social benefits are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of building engineering, in particular to a cantilever structure constructed without a support. Background Art

[0002] For the coastal trail, in order to widen the road width, it is necessary to set up a cantilever structure on the basis of the existing road to cross the existing seawall to achieve the purpose of widening the road. For reinforced concrete cantilever structures, the main method of setting up scaffolds is to carry out cast-in-place construction, but the use of scaffolds for cast-in-place construction has the following disadvantages: 1. High cost: a certain amount of scaffolding materials need to be invested, and the cost of temporary measures is high; 2. Long time consumption: both the construction and removal of scaffolds take time, which prolongs the construction period; 3. Safety hazards: There are safety risks such as high-altitude operations and falling during the construction of scaffolds, and construction safety needs to be strictly controlled; 4. Limited space: The erection of scaffolds is restricted by the sea area and will have a certain impact on the environment of the sea area it crosses. Therefore, due to the limitations of the terrain and landforms around the coastal trail, there are not only problems such as difficult scaffolding, long construction time, and high project cost, but also the use of the sea, which has a great impact on the progress of the project. Utility Model Content

[0003] The utility model aims to provide a cantilever structure constructed without a support, so as to solve the problems of difficult support erection, long construction time, high engineering cost and sea-related problems existing in support construction at sea.

[0004] In order to achieve the above-mentioned purpose, the technical solution proposed by the utility model is:

[0005] A cantilever structure constructed without a support, comprising a pile foundation, a pedestal, structural steel and a cantilever part, wherein a plurality of pile foundations are arranged at intervals, the bottom of each pile foundation is deeply buried in the foundation and the top is exposed from the foundation, a pedestal is arranged on the top of the pile foundation, a plurality of structural steels are arranged at intervals along the length direction of the pedestal, one end of each structural steel is vertically pre-buried in the pedestal, and the other end is extended outward in a direction away from the pedestal to form a cantilever end, and the cantilever part is arranged at the cantilever end.

[0006] Preferably, the structural steel includes an upper wing plate, a lower wing plate arranged parallel to and below the upper wing plate, and a web plate vertically connected between the upper wing plate and the lower wing plate.

[0007] Preferably, the structural steel is an I-beam.

[0008] Preferably, the cantilevered end protrudes obliquely upward from the base.

[0009] Preferably, the angle at which the cantilevered end protrudes obliquely upward from the platform is 5° to 6°.

[0010] Preferably, the cap is equipped with a cap steel cage, the cantilever part is equipped with a cantilever steel cage, and the cap steel cage is connected to the cantilever steel cage.

[0011] Preferably, the cap steel cage includes: a plurality of first cap top bars located at the top of the cap and arranged at intervals along the length direction of the cap, a plurality of cap waist bars located at both sides of the waist of the cap and arranged at intervals along the height direction of the cap, a plurality of cap bottom bars located at the bottom of the cap and arranged at intervals along the length direction of the cap, a plurality of cap stirrups arranged at intervals along the width direction of the cap and staggered along the length direction of the cap and connected to the first cap top bars, cap waist bars and cap bottom bars, and a plurality of cap tension bars connecting the first cap top bars and the cap bottom bars.

[0012] Preferably, the cantilever steel bar cage includes: a plurality of cantilever top bars located at the top of the cantilever part and arranged at intervals along the length direction of the cantilever part, a plurality of cantilever waist bars located at both sides of the cantilever part and arranged at intervals along the height direction of the cantilever part, a plurality of cantilever bottom bars located at the bottom of the cantilever part and arranged at intervals along the length direction of the cantilever part, cantilever stirrups arranged at intervals along the width direction of the cantilever part and connected to the cantilever top bars, cantilever waist bars and cantilever bottom bars, and cantilever tension bars connecting the cantilever top bars and cantilever bottom bars. The cantilever top bars are connected to the top bars of the first cap.

[0013] Preferably, the cap steel cage further comprises: a plurality of second cap top bars and a plurality of third cap top bars. The plurality of second cap top bars are located at the top of the cap and are arranged below the first cap top bars at intervals along the length direction of the cap, and the second cap top bars extend along the width direction of the cap to the cantilevered part and overlap with the cantilevered top bars. The plurality of third cap top bars are located at the top of the cap and are arranged below the second cap top bars at intervals along the length direction of the cap, and the third cap top bars extend obliquely downward along the width direction of the cap to the bottom thereof and then bend to be parallel to the cantilevered bottom bars, and extend along the length direction of the cantilevered bottom bars to the cantilevered part and overlap with the cantilevered bottom bars and then bend upward.

[0014] By adopting the above technical scheme, the beneficial effects of the utility model are as follows: the utility model is suitable for widening roads on seawall revetments, and a cantilever structure constructed without a scaffold is adopted to cross the seawall retaining wall. The cantilever part, pile foundation and pedestal together form a road load-bearing structure. The pile foundation and pedestal provide bearing capacity to resist the pull-out force generated by the cantilever part. The pre-embedded structural steel in the pedestal provides bearing capacity to withstand the load generated during the construction of the cantilever part. On the one hand, it can be used as a support for the construction template of the cantilever part, and on the other hand, it can be used as a permanent structure to enhance the structural bearing capacity, playing a dual role of temporary support and permanent structure, avoiding the erection of scaffolds at sea and sea-related issues, and solving the problem of difficulty in erecting scaffolds under the cantilever structure. It not only saves the cost of scaffolds, but also is safe and reliable, with a short construction period and little impact on the surrounding environment, and has obvious economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front view schematic diagram of a preferred embodiment of the utility model.

[0016] Figure 2 It is a top view schematic diagram of a preferred embodiment of the utility model.

[0017] Figure 3 for Figure 2 Schematic cross-sectional view of .

[0018] Figure 4 for Figure 3 Middle Ⅰ-Ⅰ cross-sectional view schematic diagram.

[0019] Figure 5 for Figure 3 Middle II-II cross-sectional view.

[0020] Figure 6 for Figure 5 Schematic diagram of the main view of the structural steel.

[0021] Among them: 1. Pile foundation; 2. Cap; 21. First cap top reinforcement; 22. Cap waist reinforcement; 23. Cap bottom reinforcement; 24. Cap stirrups; 25. Cap tension reinforcement; 26. Second cap top reinforcement; 27. Third cap top reinforcement; 3. Structural steel; 31. Upper wing plate; 32. Lower wing plate; 33. Web plate; 4. Cantilever part; 41. Cantilever top reinforcement; 42. Cantilever waist reinforcement; 43. Cantilever bottom reinforcement; 44. Cantilever stirrups; 45. Cantilever tension reinforcement; 5. Bank retaining wall. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0023] like Figure 1 to Figure 6 As shown, this embodiment discloses a cantilever structure constructed without a support, which includes: a pile foundation 1, a cap 2, structural steel 3 and a cantilever part 4. A plurality of pile foundations 1 are arranged at intervals on the inner side of a revetment retaining wall 5, the bottom of the pile foundation 1 is deeply buried in the foundation and the top is exposed from the foundation, a cap 2 is arranged on the top of the pile foundation 1, and a plurality of structural steels 3 are arranged at intervals along the length direction x of the cap 2, one end of the structural steel 3 is vertically pre-buried in the cap 2, and the other end is cantilevered in a direction away from the cap 2 to form a cantilever end, and the cantilever part 4 is arranged at the cantilever end.

[0024] In this embodiment, structural steel 3 is embedded in the base 2. The structural steel 3 can not only bear the load generated during the construction of the cantilever part 4 and serve as a support for the construction template of the cantilever part 4, but also can serve as a permanent structure to enhance the structural bearing capacity, playing a dual role of temporary support and permanent structure.

[0025] Specifically, the structural steel 3 of this embodiment includes: an upper wing plate 31, a lower wing plate 32 and a web 33. The upper wing plate 31 and the lower wing plate 32 are arranged in parallel up and down, and the web 33 is vertically connected between the two. The structural steel 3 of this embodiment preferably adopts an I-beam, that is, the web 33 is vertically connected to the middle of the upper wing plate 31 and the lower wing plate 32. The I-beam has high bending strength, compressive strength and torsional rigidity, can withstand large loads, and has a high bearing capacity. It can be understood that the utility model can meet the bearing capacity requirements after construction and bridge completion by adjusting the model and quantity of the embedded structural steel 3 according to the length of the cantilever part 4 and the size of the load on it.

[0026] Since the cantilevered portion 4 will bend downward when subjected to external force, in order to offset the deflection caused by this downward bending deformation, the cantilevered end of the structural steel 3 of the present embodiment is inclined upwardly protruding from the base 2, and the angle a of the inclined upward protrusion is preferably 5° to 6°, so that the entire cantilevered portion 4 can be better supported when subjected to external force, thereby improving its force-bearing performance and stability.

[0027] The cantilever part 4 of this embodiment can be cast in a large temporary structure such as a hanging basket, or a prefabricated reinforced concrete structure. The reinforced concrete structure can solve the problem of poor corrosion resistance of steel structures near the sea, and the later maintenance is simple and low-cost.

[0028] The cap 2 is provided with a cap reinforcement cage, and the cantilevered part 4 is provided with a cantilevered reinforcement cage. The cap reinforcement cage and the cantilevered reinforcement cage are connected by binding.

[0029] The cap reinforcement cage includes: a first cap top reinforcement 21, a second cap top reinforcement 26, a third cap top reinforcement 27, a cap waist reinforcement 22, a cap stirrup 24, a cap bottom reinforcement 23 and a cap tension reinforcement 25. A plurality of first cap top bars 21 are arranged at intervals on the top of the cap 2 along the length direction x of the cap 2, a plurality of second cap top bars 26 are arranged at intervals below the first cap top bars 21 along the length direction x of the cap 2, a plurality of third cap top bars 27 are arranged at intervals below the second cap top bars 26 along the length direction x of the cap 2, a plurality of cap bottom bars 23 are arranged at intervals at the bottom of the cap 2 along the length direction x of the cap 2, a plurality of cap waist bars 22 are arranged at intervals on both sides of the waist of the cap 2 along the height direction z of the cap 2, a plurality of cap stirrups 24 are arranged at intervals along the width direction y and staggered along the length direction x of the cap 2, the cap stirrups 24 are tied and connected with the first cap top bars 21, the cap waist bars 22 and the cap bottom bars 23, and a plurality of cap tension bars 25 are arranged at intervals and tied and connected with the first cap top bars 21 and the cap bottom bars 23.

[0030] The cantilever steel bar cage includes: cantilever top reinforcement 41, cantilever waist reinforcement 42, cantilever bottom reinforcement 43, cantilever stirrups 44 and cantilever tension reinforcement 45. A plurality of cantilever top reinforcements 41 are arranged at intervals on the top of the cantilever part 4 along the length direction x of the cantilever part 4, a plurality of cantilever waist reinforcements 42 are arranged at intervals on both sides of the waist of the cantilever part 4 along the height direction z of the cantilever part 4, a plurality of cantilever stirrups 44 are distributed at intervals along the width direction y of the cantilever part 4 and are tied and connected with each cantilever top reinforcement 41, cantilever waist reinforcement 42 and cantilever stirrups 44, and a plurality of cantilever tension reinforcements 45 are arranged at intervals and tied and connected with the cantilever top reinforcement 41 and the cantilever bottom reinforcement 43.

[0031] Among them, the first cap top rib 21 is tied and connected with the cantilever top rib 41 as a whole, or directly formed as a whole. The second cap top rib 26 extends along the width direction y of the cap 2 to the cantilever part 4 and overlaps with the cantilever top rib 41. The third cap top rib 27 extends obliquely downward along the width direction y of the cap 2 to the bottom of the cap 2 and then bends to be parallel to the cantilever bottom rib 43, and extends along the length direction of the cantilever bottom rib 43 to the cantilever part 4 and overlaps with the cantilever bottom rib 43 and then bends upward. The provision of the second cap top rib 26 and the third cap top rib 27 enhances the bonding strength and integrity of the cap 2 and the cantilever part 4, improves the stability and bearing capacity of the cantilever part 4, and reduces the deformation and vibration of the cantilever part 4 to a certain extent.

[0032] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes in form and details of the present invention are within the scope of protection of the present invention without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A cantilever structure constructed without a support, characterized in that: include: A plurality of pile foundations (1) are arranged at intervals, wherein the bottom of the pile foundation (1) is deeply buried in the foundation and the top is exposed from the foundation; A cap (2) is arranged on the top of the pile foundation (1); A plurality of structural steels (3) are arranged at intervals along the length direction of the pedestal (2), one end of the structural steel (3) is vertically pre-buried in the pedestal (2), and the other end of the structural steel (3) is extended outward in a direction away from the pedestal (2) to form a cantilevered end; The cantilevered portion (4) is arranged at the cantilevered end.

2. The cantilever structure constructed without support according to claim 1 is characterized in that: The structural steel (3) comprises an upper wing plate (31), a lower wing plate (32) arranged parallel to and below the upper wing plate (31), and a web plate (33) vertically connected between the upper wing plate (31) and the lower wing plate (32).

3. The cantilever structure constructed without support according to claim 2 is characterized in that: The structural steel (3) is an I-beam.

4. The cantilever structure constructed without support according to claim 1 is characterized in that: The cantilevered end protrudes obliquely upward from the base (2).

5. The cantilever structure constructed without support according to claim 4 is characterized in that: The cantilevered end protrudes obliquely upward from the base (2) at an angle of 5° to 6°.

6. The cantilever structure constructed without support according to claim 1 is characterized in that: The capping platform (2) is provided with a capping platform steel cage, the cantilevered portion (4) is provided with a cantilevered steel cage, and the capping platform steel cage is connected to the cantilevered steel cage.

7. The cantilever structure constructed without support according to claim 6 is characterized in that: The cap reinforcement cage comprises: A plurality of first cap top bars (21) located at the top of the cap (2) and arranged at intervals along the length direction of the cap (2), a plurality of cap waist bars (22) located at both sides of the waist of the cap (2) and arranged at intervals along the height direction of the cap (2), a plurality of cap bottom bars (23) located at the bottom of the cap (2) and arranged at intervals along the length direction of the cap (2), a plurality of cap stirrups (24) arranged at intervals along the width direction of the cap (2) and arranged in a staggered manner along the length direction of the cap (2) and connected to the first cap top bars (21), the cap waist bars (22) and the cap bottom bars (23), and a plurality of cap tension bars (25) connecting the first cap top bars (21) and the cap bottom bars (23); The cantilevered steel cage comprises: A plurality of cantilever top bars (41) located at the top of the cantilever portion (4) and arranged at intervals along the length direction of the cantilever portion (4), a plurality of cantilever waist bars (42) located at both sides of the cantilever portion (4) and arranged at intervals along the height direction of the cantilever portion (4), a plurality of cantilever bottom bars (43) located at the bottom of the cantilever portion (4) and arranged at intervals along the length direction of the cantilever portion (4), cantilever stirrups (44) arranged at intervals along the width direction of the cantilever portion (4) and connected to the cantilever top bars (41), the cantilever waist bars (42) and the cantilever bottom bars (43), and cantilever tension bars (45) connecting the cantilever top bars (41) and the cantilever bottom bars (43); The first bearing platform top reinforcement (21) is connected to the cantilever top reinforcement (41).

8. The cantilever structure constructed without support according to claim 7 is characterized in that: The cap steel cage also includes: A plurality of second capping platform top ribs (26) are located at the top of the capping platform (2) and are arranged below the first capping platform top ribs (21) at intervals along the length direction of the capping platform (2); the second capping platform top ribs (26) extend along the width direction of the capping platform (2) into the cantilevered portion (4) and overlap with the cantilevered top ribs (41); A plurality of third pedestal top bars (27) are located at the top of the pedestal (2) and are arranged at intervals below the second pedestal top bars (26) along the length direction of the pedestal (2). The third pedestal top bars (27) extend obliquely downward along the width direction of the pedestal (2) to its bottom and then bend to be parallel to the cantilever bottom bars (43). They extend along the length direction of the cantilever bottom bars (43) to the cantilever portion (4), overlap with the cantilever bottom bars (43), and then bend upward.

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