Guard pile supporting system and construction method

Abstract

The invention discloses a fender post supporting system and a construction method, the fender post supporting system comprises a latticed column, a supporting beam and a straining beam, the supporting beam and the straining beam are arranged perpendicular to each other and supported on the latticed column, and the fender post supporting system is characterized in that chamfer reinforcing structures are arranged at the connecting positions of the supporting beam and the straining beam with the latticed column; the chamfer reinforcing structure comprises chamfer steel bars, and the chamfer steel bars are configured to form triangular supporting areas among the supporting beams, the straining beams and the latticed columns. According to the technical scheme, the force transmission path is optimized through the triangular nodes, the force transmission efficiency is guaranteed through the continuous steel bars, and the triangular nodes and the continuous steel bars cooperate to jointly form firm and reliable node connection.

Description

Technical Field

[0001] The present invention relates to the technical field of retaining pile support, and particularly relates to a retaining pile support system and a construction method. Background Art

[0002] In the construction of deep foundation pit projects, a concrete support system composed of lattice columns, transverse support beams and longitudinal tie beams is often used to support the side walls of the foundation pit. In the prior art, the support beams and tie beams are perpendicular to each other and rely on the lattice columns for support. Due to their large self-weights and the huge foundation pit loads they bear, there is a serious stress concentration phenomenon in the node areas where they are connected to the lattice columns.

[0003] The traditional 90-degree vertical connection method makes this node a weak point in the structure, and it is extremely easy to crack or even break under complex loads, resulting in the instability of the entire support system and potential safety hazards. In addition, at the position of the lattice column, it is difficult to arrange the steel bars of the support beam and tie beam, and they often need to be cut off and bypassed, which affects the integrity of the steel bars and the casting quality of the concrete, further weakening the node strength. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a retaining pile support system and a construction method, aiming to overcome at least one related technical problem existing in the background art.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions: In a first aspect, the present application provides a retaining pile support system, including lattice columns, support beams and tie beams. The support beams and tie beams are arranged perpendicular to each other and rely on the lattice columns. A chamfer strengthening structure is provided at the connection between the support beams, tie beams and the lattice columns. The chamfer strengthening structure includes chamfer steel bars, and the chamfer steel bars are configured to form a triangular support area among the support beams, tie beams and lattice columns.

[0006] In order to solve the problem that the lattice column hinders the continuous arrangement of the steel bars in the beam, resulting in the weakening of the integrity due to the lap joint or truncation of the steel bars, in an optional embodiment, the steel bars of the support beam and / or tie beam adopt "U"-shaped steel bars at the position of the lattice column, and the "U"-shaped steel bars are configured to avoid the lattice column and achieve continuous laying of the steel bars. The present application adopts "U"-shaped steel bars.

[0007] In order to provide wrapping and anchoring for the triangular steel bar framework, form an integral body with the main structure, work together, and at the same time provide a sufficient concrete bearing area to effectively disperse stress, in an optional embodiment, the chamfer strengthening structure includes pouring concrete in the triangular support area to form a concrete chamfer. The cross-section of the concrete chamfer is square, and the side length range is 0.4 m to 0.6 m.

[0008] In order to provide a clear implementation method applicable to most medium-sized foundation pit projects, in one alternative implementation, the concrete chamfer has a size of 0.5m × 0.5m.

[0009] In one optional embodiment, the cross-sectional dimensions of the support beam are 0.8m × 0.6m, and / or the cross-sectional dimensions of the tie beam are 0.6m × 0.6m.

[0010] To further control micro-cracks on the concrete chamfered surface caused by temperature changes or shrinkage, and to improve the ultimate tensile strength and toughness of the concrete in this area, in an optional embodiment, the chamfered reinforcement structure further includes an additional steel mesh disposed within the support area of ​​the triangle.

[0011] Secondly, this application also provides a construction method for a retaining pile support system, including the following steps: At the planned connection points between the support beams and / or tie beams and the lattice columns, chamfered reinforcement is provided to form triangular reinforcement support areas; Concrete is poured to solidify the chamfered steel bars with the supporting beams, tie beams, and lattice columns, thereby forming the chamfered reinforced structure.

[0012] In one optional embodiment, the process of reinforcing the supporting beams and / or tie beams further includes: bending the reinforcing bars of the supporting beams and / or tie beams into a "U" shape at the location of the lattice column to avoid the lattice column and achieve continuous reinforcement. This method step is to ensure the continuity and integrity of the reinforcement within the beams.

[0013] In one optional embodiment, the step of configuring the chamfered steel bars includes: arranging the chamfered steel bars along the connection direction of the support beam and the tie beam, so that they form a triangular support area between the support beam, the tie beam and the lattice column, and pouring concrete within the triangular support area.

[0014] In one alternative implementation, during the concrete pouring step, the concrete pouring of the chamfered reinforcement structure is carried out simultaneously with the pouring of the support beam and tie beam.

[0015] The beneficial effects that the retaining pile support system and construction method disclosed in this application may bring include, but are not limited to: 1. Significantly improves structural strength and stability: The triangular chamfered reinforcement structure greatly improves the bending, shear and torsional resistance of the node area, effectively preventing the nodes from cracking and breaking under complex loads, and ensuring the overall stability and safety of the entire foundation pit support system.

[0016] 2. Fundamentally improve the stress performance of the joints: By transforming the stress concentration points into stress dispersion areas, the structural defects of traditional right-angle connections are fundamentally eliminated. This makes the joints no longer the weak links of the system, but instead become a strengthened area, greatly enhancing the reliability and durability of the support system.

[0017] 3. Ensure the integrity of the steel bars and improve the bearing efficiency: The application of "J"-shaped steel bars ensures the continuity of the stressed steel bars, avoiding the strength loss caused by the truncation and lapping of steel bars. The force can be smoothly transmitted along the continuous steel bars, greatly improving the material utilization rate and the ultimate bearing capacity of the components.

[0018] 4. Optimize the construction process and ensure the pouring quality: The "J"-shaped steel bars create good conditions for concrete pouring, avoiding the problem of incomplete vibration caused by over-dense steel bars. At the same time, the construction process of pouring the chamfer structure and the beam body synchronously eliminates the construction cold joints caused by post-casting, ensuring the density and uniformity of the joint concrete, and thus ensuring the final construction quality.

[0019] 5. Enhance the structural toughness and crack resistance: The additional steel bar mesh set in the triangular area can effectively restrain the concrete, inhibit and disperse the generation and development of micro-cracks, improve the toughness and deformation capacity of the joint area, and enable the structure to have better safety reserves under accidental overloading. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Fig. 1 It is a schematic diagram of a retaining pile support system of the present invention.

[0021] Fig. 2 It is a schematic diagram of the "J"-shaped steel bar.

[0022] Explanation of the reference numerals in the drawings: 1 - support beam, 2 - lattice column, 3 - tie beam, 4 - chamfer steel bar, 5 - support area. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following will describe various exemplary embodiments, features and aspects of the present application in detail with reference to the drawings. The same reference numerals in the drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the drawings, unless otherwise specified, the drawings do not have to be drawn to scale.

[0024] In the description of the present application, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, or an indirect connection through an intermediate medium, or the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0025] AsFigs. 1-2 As shown in Figs. 1-2 , in a first aspect, the present application provides a retaining pile support system, which includes a lattice column 2, a support beam 1 and a tie beam 3. The support beam 1 and the tie beam 3 are arranged perpendicular to each other and rely on the lattice column 2. A chamfer strengthening structure is provided at the connection between the support beam 1, the tie beam 3 and the lattice column 2. The chamfer strengthening structure includes chamfer steel bars 4, and the chamfer steel bars 4 are configured to form a triangular support area 5 among the support beam 1, the tie beam 3 and the lattice column 2.

[0026] In the technical solution of the present application, the lattice column 2 is vertically arranged in the foundation pit and serves as the main vertical load-bearing member. The support beam 1 and the tie beam 3 are horizontally arranged and are perpendicularly connected to each other at the top or side of the lattice column 2. The chamfer strengthening structure is located in the joint core area where the three meet. The chamfer steel bars 4 are arranged at the joint, and their shape and position form a triangular skeleton area.

[0027] In order to achieve the technical effect of changing the original 90-degree right-angle connection between the support beam 1 and the tie beam 3, which is prone to stress concentration, into a triangular area with better mechanical properties, so as to disperse and transfer the joint stress and significantly improve the bending resistance, shear resistance and crack resistance of the joint, the present application provides a chamfer strengthening structure including chamfer steel bars 4 at the connection, forming a triangular support area 5. This triangular structure has extremely high stability in mechanics and can effectively distribute the load transmitted by the beam body to the lattice column 2, fundamentally avoiding brittle failure at the joint.

[0028] It should be noted that the chamfer strengthening structure is not limited to a specific triangular angle, and its hypotenuse can be linear or slightly arc-shaped, as long as it can form a non-right-angle transition area. The arrangement of the chamfer steel bars 4 can be in a mesh shape, a radial shape or other forms that can form a stable triangular skeleton.

[0029] In order to solve the problem that the lattice column 2 hinders the continuous arrangement of the steel bars in the beam, resulting in the weakening of the integrity due to the lapping or truncation of the steel bars, in some embodiments, the steel bars of the support beam 1 and / or the tie beam 3 adopt "J"-shaped steel bars at the position of the lattice column 2, and the "J"-shaped steel bars are configured to avoid the lattice column 2 and achieve the continuous laying of the steel bars. The present application adopts "J"-shaped steel bars. This setting enables the main stress-bearing steel bars in the beam to continuously penetrate the entire beam body, avoids the weakness of steel bar lapping at the key joints, ensures the effective transmission of force, and at the same time leaves sufficient space for concrete pouring, ensuring the pouring quality.

[0030] Specifically, the "Ji"-shaped steel bars are part of the main bars of the supporting beam 1 or the tie beam 3. When encountering the lattice column 2, instead of being cut off, they are bent and formed to bypass from the side or the reserved space of the lattice column 2, and then restored to the original designed position, thus ensuring the continuity of the steel bars.

[0031] Certainly, the specific bending shape of the "Ji"-shaped steel bars is not limited to a strict "Ji" shape. It can be a smooth arc, a U shape or other bending shapes that can bypass obstacles and maintain continuity.

[0032] In order to provide wrapping and anchoring for the triangular steel bar framework, form an integral body with the main structure to work together, and at the same time provide sufficient concrete bearing area to effectively disperse stress, in some embodiments, the chamfer strengthening structure includes pouring concrete in the triangular support area 5 to form a concrete chamfer. The cross-section of the concrete chamfer is square, and its side length ranges from 0.4 m to 0.6 m.

[0033] The concrete chamfer is integrally cast with the supporting beam 1, the tie beam 3 and the lattice column 2, filling the triangular space formed by the chamfer steel bars 4 to form a solid concrete triangular area. Setting the chamfer size in the range of 0.4 m to 0.6 m is to adapt to the engineering requirements of different load levels and beam sizes, providing design flexibility. And the size is preferably 0.5 m × 0.5 m, based on the fact that under conventional beam sizes (such as 0.8 m × 0.6 m and 0.6 m × 0.6 m), this size can achieve the best balance between ensuring structural performance and saving materials.

[0034] In order to provide a clear implementation method applicable to most medium-sized foundation pit projects, in some embodiments, the size of the concrete chamfer is 0.5 m × 0.5 m.

[0035] In some embodiments, the cross-sectional size of the supporting beam 1 is 0.8 m × 0.6 m, and / or the cross-sectional size of the tie beam 3 is 0.6 m × 0.6 m.

[0036] In order to further control the micro-cracks generated on the surface of the concrete chamfer due to temperature change or shrinkage, and improve the ultimate tensile capacity and toughness of the concrete in this area, in some embodiments, the chamfer strengthening structure further includes an additional steel bar mesh arranged in the triangular support area 5. This layer of steel bar mesh can effectively restrain the concrete, prevent the crack from expanding, and enable the chamfer strengthening structure to still maintain good working performance under the ultimate load.

[0037] Specifically, the additional steel bar mesh is arranged inside the concrete chamfer, usually located on the surface layer, and is tied or welded to the chamfer steel bars 4 and the steel bars of the beam and column.

[0038] Secondly, this application also provides a construction method for a retaining pile support system, including the following steps: At the planned connection points between the support beam 1 and / or tie beam 3 and the lattice column 2, chamfered steel bars 4 are provided to form a triangular steel bar support area 5; Concrete is poured to solidify the chamfered steel bar 4 with the supporting beam 1, tie beam 3 and lattice column 2, thereby forming the chamfered reinforced structure.

[0039] To ensure that the chamfered reinforcement structure forms a highly integrated rigid joint with the main structure (support beam 1, tie beam 3, and lattice column 2), this application adopts a construction method in which the chamfered steel bars 4 are configured together with the main reinforcement bars and poured together. This method avoids the problem of weak joint surfaces caused by post-cast strips and ensures the continuity of materials and the uniformity of mechanical properties in the joint area.

[0040] Specifically, the reinforcement of supporting beam 1, tie beam 3, and lattice column 2 is tied first, and chamfered reinforcement 4 is specially arranged at the joints to form a triangular skeleton. Then the formwork is erected, and finally the concrete is poured in one go.

[0041] In some embodiments, the process of reinforcing the support beam 1 and / or tie beam 3 further includes: bending the reinforcing bars of the support beam 1 and / or tie beam 3 into a "U" shape at the location of the lattice column 2 to avoid the lattice column 2 and achieve continuous reinforcement. This method step is to ensure the continuity and integrity of the reinforcement within the beam.

[0042] In some embodiments, the step of configuring the chamfered steel bar 4 includes: arranging the chamfered steel bar 4 along the connection direction of the support beam 1 and the tie beam 3, so that it forms a triangular support area 5 between the support beam 1, the tie beam 3 and the lattice column 2, and pouring concrete in the triangular support area 5.

[0043] In some embodiments, during the concrete pouring step, the concrete pouring of the chamfered reinforcement structure is carried out simultaneously with the pouring of the support beam 1 and the tie beam 3.

[0044] The core working principle of this invention lies in "morphological transformation" and "continuity assurance." By changing the geometry of the node area and the reinforcement configuration, it fundamentally solves the problem of weak nodes in traditional support systems. The force transmission path is optimized through "triangular nodes," and the force transmission efficiency is ensured through "continuous reinforcement." These two elements work together to create a robust and reliable node connection. Specifically: 1. Mechanical optimization of node morphology: from "right angle" to "triangular" Traditional problem: The supporting beam 1 and the tie beam 3 are connected at a 90-degree right angle at the lattice column 2. Under the action of load, the direction of force transmission changes drastically at this point, resulting in high stress concentration, which is similar to a fragile "hinge point".

[0045] The present invention addresses this issue by constructing a triangular support region 5 at the joint through the installation of chamfered reinforcing bars 4 and the pouring of concrete. Triangles are considered extremely stable shapes in structural mechanics. This triangular concrete structure, acting as a "structural transition zone," smoothly guides the force flow from the support beam 1 and tie beam 3 to the lattice column 2, effectively dispersing concentrated stress over a larger area.

[0046] 2. Ensuring the continuity of reinforcement configuration: from "cutting off and bypassing" to "continuous connection" Traditional problem: The lattice column 2 obstructs the continuous arrangement of steel bars in the beam. Usually, the steel bars need to be cut off and then lapped or welded. This not only creates a weak point in the structure, but also makes it difficult to pour dense concrete in areas with dense steel bars.

[0047] The present invention employs "U"-shaped reinforcing bars, allowing the main load-bearing reinforcing bars of the beam to continuously and smoothly bypass the lattice column 2, achieving "continuous reinforcement." This ensures a continuous and uninterrupted force transmission path, maximizing the tensile strength of the reinforcing bars. Simultaneously, this provides a regular space for concrete pouring, ensuring the density of the concrete and enabling better collaboration between the reinforcing bars and concrete.

[0048] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A retaining pile support system, comprising a lattice column (2), a support beam (1), and a tie beam (3), wherein the support beam (1) and the tie beam (3) are arranged perpendicularly to each other and rely on the lattice column (2), characterized in that, A chamfer strengthening structure is provided at the connection of the support beam (1) and tie beam (3) with the lattice column (2). The chamfer strengthening structure includes chamfer steel bars (4), and the chamfer steel bars (4) are configured to form a triangular support area (5) between the support beam (1), tie beam (3) and lattice column (2).

2. The retaining pile support system as described in claim 1, characterized in that, The steel bars of the support beam (1) and / or tie beam (3) adopt "U"-shaped steel bars at the position of the lattice column (2), and the "U"-shaped steel bars are configured to avoid the lattice column (2) and achieve continuous laying of steel bars.

3. The retaining pile support system as described in claim 1 or 2, characterized in that, The chamfer strengthening structure includes pouring concrete in the triangular support area (5) to form a concrete chamfer. The cross-section of the concrete chamfer is square, and its side length ranges from 0.4 m to 0.6 m.

4. The retaining pile support system as described in claim 3, characterized in that, The cross-sectional size of the concrete chamfer is 0.5 m × 0.5 m.

5. The retaining pile support system as described in claim 1 or 2, characterized in that, The cross-sectional size of the support beam (1) is 0.8 m × 0.6 m, and / or the cross-sectional size of the tie beam (3) is 0.6 m × 0.6 m.

6. The retaining pile support system as described in claim 1 or 2, characterized in that, The chamfer strengthening structure further includes an additional steel bar mesh arranged in the triangular support area (5).

7. A construction method for a retaining pile support system as described in any one of claims 1-6, characterized in that, It includes the following steps: At the planned connection of the support beam (1) and / or tie beam (3) with the lattice column (2), configure chamfer steel bars (4) to form a triangular steel bar support area (5); Perform concrete pouring so that the chamfer steel bars (4) are solidified into one body with the support beam (1), tie beam (3) and lattice column (2), thereby forming the chamfer strengthening structure.

8. The construction method as described in claim 7, characterized in that, During the process of configuring steel bars for the support beam (1) and / or tie beam (3), it further includes: at the position of the lattice column (2), bend the steel bars of the support beam (1) and / or tie beam (3) into a "U" shape to avoid the lattice column (2) and achieve continuous laying of steel bars.

9. The construction method as described in claim 7, characterized in that, The step of configuring the chamfer steel bars (4) includes: arranging the chamfer steel bars (4) along the connection direction of the support beam (1) and tie beam (3), and forming a triangular support area (5) between it and the support beam (1), tie beam (3) and lattice column (2), and pouring concrete in the triangular support area (5).

10. The construction method as described in claim 7, characterized in that, In the concrete pouring step, the concrete pouring of the chamfer strengthening structure is carried out synchronously with the pouring of the support beam (1) and tie beam (3).

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