Reinforcing steel bar structure for expanding disk of squeezed branch disk pile

Abstract

The utility model discloses a reinforcing steel bar structure for extruding and expanding a branch pile expansion disc, which is characterized in that an extruding and expanding unit of an inner stirrup, an outer stirrup and an anti-cracking constructional reinforcing steel bar are respectively and fixedly arranged inside and outside a reinforcing steel bar cage main reinforcement is fixedly arranged at the top of an outer convex unit, an auxiliary circular ring is arranged below the inner stirrup, and the extruding and expanding unit comprises a vertical reinforcing steel bar; the tops of the vertical steel bars are rotatably arranged on the inner stirrups in a sleeving mode, the auxiliary circular rings are slidably installed on the inner rings of the vertical steel bars, and the bottoms of the outwards-protruding units are temporarily folded and fixed through the consolidation steel wires. A steel wire rope fixedly connected to the auxiliary circular ring downwards extends to the inner stirrup at the bottom of the outer convex unit, reversely bypasses and upwards extends to the top end of the reinforcement cage; the steel wire rope is pulled to drive the auxiliary circular ring to slide downwards, and the outwards-protruding units are driven to unfold towards the periphery to form a branch disc framework. Automatic unfolding of the branch disc framework is achieved, construction operation is simplified, forming quality is improved, the structure is compact and convenient to transport and install, and after unfolding, a stable supporting structure is formed to improve the pile foundation bearing capacity.

Description

Technical Field

[0001] The utility model relates to the technical field of infrastructure construction, in particular to a steel bar structure used for expanding a branch plate pile. Background Art

[0002] At present, the common pile foundation expansion device generally adopts an ordinary steel cage structure, which is mainly welded by longitudinal main bars and transverse stirrups, and the oblique steel bars are pre-welded at the position where the expansion support plate is needed. During the construction of this structure, the construction workers need to manually bend the oblique steel bars to expand them outward to form the support plate.

[0003] Chinese patent document (publication number: CN208830303U) A variable-section steel cage structure that can be used to reinforce the branch plates of extruded branch plates and cast-in-place piles. The utility model relates to a variable-section steel cage structure that can be used to reinforce the branch plates of extruded branch plates and cast-in-place piles, comprising a steel cage, a steel pipe, a reinforcement structure, an extruded branch plate, a steel pipe guide groove and a steel ring; the extruded branch plates are evenly arranged on the outside of the pile body; the steel cage is composed of longitudinal main bars and annular stirrups; a steel pipe is arranged in the center of the steel cage, the steel pipe is arranged in the steel pipe guide groove, and a steel ring is welded on the steel pipe; the reinforcement structure comprises an upper transmission steel bar, a lower rotating steel bar located on the outside of the steel cage and a multi-stage cross-shear folded steel bar; the upper end of the upper transmission steel bar is connected to the steel ring through the reinforcement structure and the upper hinge point, and the lower end of the upper transmission steel bar is connected to the upper end of the lower rotating steel bar through the hinge point between the upper transmission steel bar and the lower rotating steel bar. The beneficial effect of the utility model is that by arranging reinforcement at the branch plate position of the squeezed branch plate cast-in-place pile, shear damage of the branch plate is avoided, the bearing performance of the squeezed branch plate pile is brought into play to a greater extent, and the bearing capacity and stability of the overall pile foundation are improved.

[0004] The traditional structure has obvious shortcomings: first, the manual bending method is difficult to ensure uniform force everywhere, which easily causes inconsistent deformation of the steel bars; second, there are many welding points, and secondary processing is required on the construction site, which not only increases the workload, but also may affect the overall performance of the structure; third, manual operation is difficult, and construction workers need to complete the support plate deployment work in a small space, which is time-consuming and has safety hazards. In addition, since the support plate steel bars are pre-fixed, they take up a large space during transportation and are prone to deformation, which brings many inconveniences to the construction project. Utility Model Content

[0005] In view of the shortcomings of the prior art, the utility model provides a steel bar structure for expanding branch plate piles, which has a simple structure and saves space. It is arranged inside the steel cage to reduce the probability of deformation during transportation. It is easy to operate, stays away from narrow spaces, and is fast and efficient.

[0006] The utility model adopts the following technical solutions:

[0007] A steel bar structure for expanding a branch plate pile comprises anti-cracking structural steel bars installed inside a steel cage, the steel cage comprises a plurality of steel cage main bars arranged in an array, inner and outer stirrups are respectively fixedly installed inside and outside the steel cage main bars, the anti-cracking structural steel bars comprise a connector of an expansion unit and an outer convex unit arranged in an array, the expansion unit is fixedly installed on the top of the outer convex unit; an auxiliary ring is arranged below the inner stirrup; the expansion unit comprises a vertical steel bar, the top of the vertical steel bar is rotatably sleeved on the inner stirrup, and the auxiliary ring is slidably installed on the inner ring of a plurality of vertical steel bars; the bottoms of the plurality of outer convex units are temporarily gathered and fixed by consolidating steel wires, and a plurality of steel wire ropes are fixedly connected in an array on the auxiliary ring, the steel wire ropes extend downward to the inner stirrups at the bottom of the outer convex unit, detour in the opposite direction and extend upward to the top of the steel cage; when the steel wire rope at the top of the steel cage is pulled, the steel wire rope pulls the auxiliary ring to slide downward to drive the plurality of outer convex units to expand outward to form a branch plate skeleton.

[0008] As a preferred technical solution of the utility model, the extrusion and expansion unit includes upright steel bars and guide steel bars. The guide steel bars are arranged in parallel with the upright steel bars and both ends are fixed by welding to form a belt ring. The top of the belt ring can be rotatably mounted on the inner hoop, and the auxiliary circular ring is mounted inside all the belt rings.

[0009] As a preferred technical solution of the utility model, the extrusion and expansion unit includes an upright steel bar, a guide ring and a limit ring. The limit ring is fixedly connected to the top of the upright steel bar, and the limit ring is rotatably mounted on the inner hoop. The outer peripheral array of the auxiliary circular ring is fixedly connected to several guide rings, and the guide rings are all slidably mounted on the adjacent upright steel bars.

[0010] As a preferred technical solution of the utility model, the convex unit is a trapezoidal frame connected by steel bars, the lower base of the trapezoidal frame is fixed to the bottom of the upright steel bars, and the upper base of the trapezoidal frame faces the periphery of the steel cage.

[0011] As a preferred technical solution of the utility model, the main bars of the steel cage are evenly arranged in an array, and the spacing between adjacent main bars of the steel cage is equal.

[0012] As a preferred technical solution of the utility model, the inner stirrups and the outer stirrups are arranged at intervals along the axial direction of the main reinforcement of the steel cage, and the spacing between the inner stirrups and the outer stirrups is equal.

[0013] As a preferred technical solution of the utility model, the main reinforcement of the steel cage adopts HRB400 grade ribbed steel bars with a diameter of 25-32mm.

[0014] As a preferred technical solution of the utility model, the auxiliary ring is located 100-150 mm from the lower end of the inner stirrup.

[0015] As a preferred technical solution of the present utility model, the spacing between the inner stirrups and the outer stirrups is 150-200 mm.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. In the initial state of the steel structure of the utility model, the convex unit is kept in a temporarily retracted state by the consolidation steel wire, and the overall structure is compact; when it is necessary to form a support plate, the steel wire rope extending to the top of the steel cage is pulled, and the steel wire rope drives the auxiliary ring to slide downward along the upright steel bar. Since the top of the upright steel bar is rotatably connected to the inner hoop and the bottom is fixedly connected to the convex unit, the downward movement of the auxiliary ring will drive the upright steel bar to swing outward, and the swing of the upright steel bar drives the convex unit to expand toward the periphery, finally forming a support plate skeleton; wherein the anti-cracking structural steel bar provides skeleton support for the pile foundation expansion plate part to prevent concrete cracking; the auxiliary ring serves as a motion control center, converting vertical motion into radial expansion, the steel wire rope provides driving force and controls the expansion process, and the consolidation steel wire serves as a temporary fixation. During the sliding of the auxiliary ring, the temporary consolidation steel wire will be squeezed open to ensure the stability of the structure during installation.

[0018] 2. The utility model realizes the automatic deployment of the support plate skeleton through the mechanical linkage of the steel structure, which significantly simplifies the construction operation process and improves the construction efficiency; the controllable deployment mechanism ensures the uniformity and stability of the support plate formation process and effectively improves the forming quality; the motion control design of the auxiliary ring enhances the controllability and safety of the construction process; the structure is compact in the initial state, which greatly reduces the difficulty of transportation and installation; the stable support structure formed after deployment significantly improves the bearing capacity of the pile foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall installation structure of the anti-crack structural steel bar before the utility model is put in;

[0020] Figure 2 Schematic diagram of the anti-crack structural steel bar installation structure before deployment in the first embodiment of the utility model Figure 1 ;

[0021] Figure 3 Schematic diagram of the anti-crack structural steel bar installation structure before deployment in the first embodiment of the utility model Figure 2 ;

[0022] Figure 4 This is a schematic diagram of the overall installation structure of the anti-crack structural steel bar after the utility model is unfolded;

[0023] Figure 5 It is a schematic diagram of the cross-sectional structure of the anti-cracking structural steel bar after being unfolded in the first embodiment of the utility model;

[0024] Figure 6 This is a schematic diagram of the anti-crack structural steel bar installation structure before being deployed in the second embodiment of the utility model;

[0025] In the figure:

[0026] Main reinforcement of the steel cage - 11; inner stirrups - 12; outer stirrups - 13; auxiliary circular rings - 14; anti-cracking structural steel bars - 15; steel wire ropes - 16; extrusion and expansion units - 17; external convex units - 18; vertical steel bars - 19; guide steel bars - 20; guide rings - 21; limiting rings - 22; consolidation steel wires - 23. DETAILED DESCRIPTION

[0027] The following will be combined with the implementation of the utility model to clearly and completely describe the technical solutions in the implementation of the utility model. Obviously, the described implementation is only a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] The squeezed branch plate pile is a new type of bored cast-in-place pile with a clear force mechanism. It uses a branch plate squeeze and expansion machine to apply three-dimensional static pressure to the soil around each branch and the bearing plate through hydraulic squeezing and expansion in the hard soil layer according to the geological conditions. The squeezed branch plate pile cavity is tightly combined with the surrounding soil of the squeezed and expanded branch plate pile cavity and the concrete pile body and branch plate of the cast-in-place pile in the cavity, and the pile and soil work together to form a squeezed branch plate pile. This technology can make full use of the foundation bearing soil layer, effectively reduce the pile diameter and pile length, and greatly improve the bearing capacity of the pile, reducing the settlement of the pile body. In turn, it can shorten the pile length, reduce the amount of engineering, and save resources.

[0029] Embodiment 1:

[0030] like Figure 1-Figure 5As shown in the figure, a steel bar structure for expanding branch plate piles includes anti-cracking structural steel bars 15 installed inside a steel cage, the steel cage includes a plurality of steel cage main bars 11 arranged in an array, inner and outer stirrups 12 and outer stirrups 13 are respectively fixedly installed inside and outside the steel cage main bars 11, the anti-cracking structural steel bars 15 include a connector of an expansion unit 17 and an outer convex unit 18 arranged in an array, the expansion unit 17 is fixedly installed on the top of the outer convex unit 18; an auxiliary ring 14 is arranged below the inner stirrup 12; the expansion unit 17 includes upright steel bars 19, the upright steel bars The top of 19 can be rotatably mounted on the inner hoop 12, and the auxiliary ring 14 can be slidably installed on the inner ring of several upright steel bars 19; the bottoms of the several convex units 18 are temporarily gathered and fixed by consolidating steel wires 23, and several steel wire ropes 16 are fixedly connected in an array on the auxiliary ring 14, and the steel wire ropes 16 extend downward to the inner hoop 12 at the bottom of the convex unit 18, and then extend upward to the top of the steel cage in the opposite direction; when the steel wire rope 16 at the top of the steel cage is pulled, the steel wire rope 16 pulls the auxiliary ring 14 to slide downward, driving the several convex units 18 to expand outward to form a support plate skeleton.

[0031] In the initial state of the steel structure of the utility model, the convex unit 18 is kept in a retracted state by the consolidation steel wire 23, and the overall structure is compact. When it is necessary to form a support plate, the steel wire rope 16 extending to the top of the steel cage is pulled, and the steel wire rope 16 drives the auxiliary ring 14 to slide downward along the upright steel bar 19. Since the top of the upright steel bar 19 is rotatably connected to the inner hoop 12 and the bottom is fixedly connected to the convex unit 18, the downward movement of the auxiliary ring 14 will drive the upright steel bar 19 to swing outward, and the swing of the upright steel bar 19 drives the convex unit 18 to expand toward the periphery, finally forming a support plate skeleton; wherein the anti-cracking structural steel bar 15 provides skeleton support for the pile foundation expansion plate part to prevent concrete cracking; the auxiliary ring 14 The ring 14 serves as the motion control center, converting the vertical motion into radial expansion. The wire rope 16 provides driving force and controls the expansion process. The consolidation wire 23 serves as a temporary fixation. The temporary consolidation wire 23 will be squeezed open during the sliding of the auxiliary ring 14, ensuring the stability of the structure during the installation process and making a smooth transition of the structural state change. The structure realizes the automatic expansion of the support plate skeleton, simplifies the construction operation, ensures the uniformity of the expansion through mechanical linkage, improves the molding quality, adopts a controllable expansion mechanism, enhances the controllability and safety of the construction process, and has a compact overall structure that is easy to transport and install. After expansion, a stable support structure is formed, which improves the bearing capacity of the pile foundation.

[0032] Furthermore, the extrusion and expansion unit 17 includes upright steel bars 19 and guide steel bars 20. The guide steel bars 20 are arranged in parallel with the upright steel bars 19 and both ends are fixed by welding to form a belt ring. The top of the belt ring can be rotatably mounted on the inner hoop 12, and the auxiliary ring 14 is mounted inside all the belt rings.

[0033] Figure 1 , Figure 2 As shown in the figure, by adding a guide steel bar 20 on the outside of the upright steel bar 19 and forming a belt ring structure, the extrusion expansion unit 17 has better structural strength and stability. The parallel arrangement of the two steel bars and the design of welding the ends into a belt ring enhance the overall rigidity. The rotatable connection between the belt ring and the inner hoop 12 ensures flexibility during the unfolding process. At the same time, the auxiliary ring 14 is sleeved inside all the belt rings, which can transmit force and movement more evenly, ensuring that each convex unit 18 is unfolded synchronously, thereby improving the quality and reliability of the support plate forming.

[0034] Furthermore, the convex unit 18 is a trapezoidal frame connected by steel bars, the lower bottom edge of the trapezoidal frame is fixed to the bottom of the vertical steel bars 19, and the upper bottom edge of the trapezoidal frame faces the outer periphery of the steel cage. The convex unit 18 can also be a plate-type trapezoidal frame connected by steel plates, the lower bottom edge of the plate-type trapezoidal frame is fixed to the bottom of the vertical steel bars 19, and the upper bottom edge of the plate-type trapezoidal frame faces the outer periphery of the steel cage.

[0035] Figure 1-Figure 6 As shown in the figure, the trapezoidal frame structure is adopted so that the convex unit 18 can form a reasonable support angle after being unfolded. The lower bottom edge is fixed to the upright steel bar 19 to ensure the stability of the structure, and the upper bottom edge facing the periphery is conducive to supporting concrete and soil. Providing two optional schemes of steel bar connection and steel plate connection increases the applicability. Among them, the trapezoidal frame connected with steel bars has good permeability and adhesion with concrete, while the plate-type trapezoidal frame connected with steel plates has a larger support area and better integrity. Construction personnel can choose the appropriate form according to the specific needs of the project. Both structures can ensure the effective wrapping of concrete and reliable support of the surrounding soil when the branch piles are formed.

[0036] Furthermore, the main reinforcement bars 11 of the steel cage are evenly arranged in an array, and the spacing between adjacent main reinforcement bars 11 of the steel cage is equal.

[0037] Figure 1 As shown in the figure, by arranging the main reinforcement 11 of the reinforcement cage in an array and with equal adjacent spacing, the symmetry and force uniformity of the entire reinforcement cage structure are ensured, which is conducive to the standardized installation of the inner stirrups 12 and the outer stirrups 13, and also facilitates the uniform arrangement of the anti-cracking structural reinforcement 15, thereby ensuring the stability and reliability of the entire branch pile structure, and the standardized arrangement method also simplifies the construction process and improves construction efficiency.

[0038] Furthermore, the inner stirrups 12 and the outer stirrups 13 are both arranged at intervals along the axial direction of the main reinforcement 11 of the steel cage, and the spacing between the inner stirrups 12 and the outer stirrups 13 is equal.

[0039] By arranging the inner stirrups 12 and the outer stirrups 13 at equal intervals along the axial direction of the main reinforcement 11 of the steel cage, a standardized spatial grid structure is formed, ensuring the overall stability of the steel cage; the design of equal spacing between the inner and outer stirrups (150-200mm) not only ensures the structural strength, but also realizes the economical and rational use of materials, and also provides a uniform support spacing for the installation of the anti-crack structural reinforcement 15, which is conducive to the standardization and quality control of construction.

[0040] Furthermore, the main reinforcement 11 of the reinforcement cage is made of HRB400 grade ribbed steel bars with a diameter of 25-32 mm.

[0041] HRB400 grade ribbed steel bars are used as the main reinforcement 11 of the steel cage. Their high strength (yield strength ≥ 400MPa) and good mechanical properties are used to meet the bearing requirements of the branch piles. The ribs on the surface enhance the bond strength and adhesion with the concrete. The large diameter specification of 25-32mm is selected to ensure sufficient bearing capacity and bending stiffness while avoiding the construction difficulties that may be caused by too large a diameter. At the same time, considering that the branch piles are subjected to large vertical pressure and horizontal soil pressure, this specification of steel bars can provide good structural stability and durability.

[0042] Furthermore, the auxiliary ring 14 is located 100-150 mm from the lower end of the inner stirrup 12 .

[0043] By setting the auxiliary ring 14 at a specific position 100-150mm from the lower end of the inner hoop 12, it is ensured that the auxiliary ring 14 has sufficient movement space to drive the upright steel bars 19 and the convex unit 18 to unfold, and the control instability that may be caused by excessive distance is avoided; the design of this distance range enables the pulling force of the wire rope 16 to be transmitted most effectively, while facilitating installation and operation by construction personnel, thereby improving the controllability and reliability of the support plate unfolding process.

[0044] Furthermore, the spacing between the inner stirrups 12 and the outer stirrups 13 is 150-200 mm.

[0045] The use of a stirrup spacing of 150-200mm not only meets the structural stability requirements, but also avoids material waste caused by overly dense arrangement, while leaving enough space for concrete pouring; this spacing range enables the internal and external stirrups to effectively restrain the main bars of the steel cage, provide sufficient lateral support, and ensure that the steel cage maintains a stable shape during construction and use. The standardized spacing design is conducive to on-site construction control and improves construction efficiency and quality.

[0046] Embodiment 2:

[0047] Different from Example 1, the extrusion and expansion unit 17 includes an upright steel bar 19, a guide ring 21 and a limit ring 22. The limit ring 22 is fixedly connected to the top of the upright steel bar 19, and the limit ring 22 is rotatably mounted on the inner hoop 12; the outer peripheral array of the auxiliary circular ring 14 is fixedly connected to several guide rings 21, and the guide rings 21 are all slidably mounted on the adjacent upright steel bars 19.

[0048] Figure 6 As shown in the figure, the combination of the limiting ring 22 and the guide ring 21 is used to replace the original belt ring structure, which is another motion guiding method. Among them, the limiting ring 22 is fixed to the top of the upright steel bar 19 and can be rotatably sleeved on the inner hoop 12, ensuring the position stability of the upright steel bar 19; the guide ring 21 fixed in the outer peripheral array of the auxiliary ring 14 and the sliding cooperation with the upright steel bar 19 provide a better motion guiding effect, so that the upright steel bar 19 moves smoothly during the deployment process. This design simplifies the structure, reduces the welding process, and improves the reliability and accuracy of the support plate deployment.

[0049] The utility model uses the above embodiments to illustrate the technical concept of the utility model, but the utility model is not limited to the above embodiments, that is, it does not mean that the utility model must rely on the above embodiments to be implemented. Those skilled in the art should understand that the relevant improvements to the utility model fall within the protection scope and disclosure scope of the utility model.

Claims

1. A steel bar structure for expanding a branch plate pile, comprising anti-cracking structural steel bars (15) installed inside a steel cage, wherein the steel cage comprises a plurality of steel cage main bars (11) arranged in an array, and inner and outer stirrups (12) and outer stirrups (13) are respectively fixedly installed inside and outside the steel cage main bars (11), characterized in that: The anti-crack structural steel bar (15) comprises a connection body of extrusion units (17) and convex units (18) arranged in an array, wherein the extrusion units (17) are fixedly connected to the top of the convex units (18); An auxiliary ring (14) is arranged below the inner stirrup (12); the extrusion and expansion unit (17) comprises a vertical steel bar (19), the top of the vertical steel bar (19) is rotatably sleeved on the inner stirrup (12), and the auxiliary ring (14) is slidably mounted on the inner rings of a plurality of vertical steel bars (19); The bottoms of the plurality of convex units (18) are temporarily gathered and fixed by means of a consolidation steel wire (23); the auxiliary circular ring (14) is array-fixedly connected with a plurality of steel wire ropes (16); the steel wire ropes (16) extend downward to the inner stirrups (12) at the bottom of the convex unit (18), extend in the opposite direction and extend upward to be preset at the top of the steel cage; When the steel wire rope (16) at the top of the steel cage is pulled, the steel wire rope (16) pulls the auxiliary ring (14) to slide downward, driving the plurality of convex units (18) to expand outward to form a support plate skeleton.

2. The steel bar structure for expanding the branch plate pile according to claim 1, characterized in that: The extrusion and expansion unit (17) comprises a vertical steel bar (19) and a guide steel bar (20); the guide steel bar (20) is arranged in parallel with the vertical steel bar (19) at intervals and both ends are fixed by welding to form a belt ring; the top of the belt ring is rotatably mounted on the inner hoop (12), and the auxiliary ring (14) is mounted inside all the belt rings.

3. The steel bar structure for expanding the branch plate pile according to claim 1, characterized in that: The extrusion and expansion unit (17) comprises a vertical steel bar (19), a guide ring (21) and a limit ring (22), wherein the limit ring (22) is fixedly connected to the top of the vertical steel bar (19), and the limit ring (22) is rotatably sleeved on the inner hoop (12); the outer peripheral array of the auxiliary circular ring (14) is fixedly connected to a plurality of guide rings (21), and the guide rings (21) are all slidably sleeved on the adjacent vertical steel bars (19).

4. The steel bar structure for expanding the branch plate of an expanded pile according to any one of claims 1 to 3, characterized in that: The convex unit (18) is a trapezoidal frame formed by connecting steel bars, the lower base of the trapezoidal frame is fixed to the bottom of the upright steel bars (19), and the upper base of the trapezoidal frame faces the outer periphery of the steel cage.

5. The steel bar structure for expanding the branch plate pile according to claim 1, characterized in that: The main reinforcement bars (11) of the steel cage are evenly arranged in an array, and the spacing between adjacent main reinforcement bars (11) of the steel cage is equal.

6. The steel bar structure for expanding the branch plate pile according to claim 1, characterized in that: The inner stirrups (12) and the outer stirrups (13) are both arranged at intervals along the axial direction of the main reinforcement (11) of the steel cage, and the spacing between the inner stirrups (12) and the outer stirrups (13) is equal.

7. The steel bar structure for expanding the branch plate pile according to claim 1, characterized in that: The main reinforcement (11) of the steel cage is made of HRB400 grade ribbed steel bars with a diameter of 25-32 mm.

8. The steel bar structure for expanding the branch plate of an expanded pile according to claim 1, characterized in that: The auxiliary ring (14) is located 100-150 mm from the lower end of the inner stirrup (12).

9. The steel bar structure for expanding the branch plate of an extruded pile according to claim 1, characterized in that: The distance between the inner stirrups (12) and the outer stirrups (13) is 150-200 mm.

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