Stacking yard pile foundation bearing platform structure and construction method thereof

Abstract

The invention provides a pile foundation bearing platform structure of a stockyard and a construction method thereof, and relates to the technical field of stockpiling. A pile foundation bearing platform structure of a stockyard comprises a bearing platform main body formed by pouring reinforced concrete and an engineering pile, the bottom face of the bearing platform main body is fixedly connected with the engineering pile, a haunching part integrally formed in a pouring mode is arranged on at least one lateral stress end face side of the bearing platform main body, and the haunching part extends in the lateral direction and the vertical direction. Therefore, the lateral load-bearing area and the total height of the pile foundation bearing platform structure are increased. Fertilizer grooves are formed in the peripheries of the bearing platform main body and the haunching part, and improved soil bodies are backfilled and compacted in the fertilizer grooves, so that the improved soil bodies are in close contact with the side faces of the bearing platform main body and the haunching part. In addition, the invention further provides a construction method of the pile foundation bearing platform structure of the stockyard, the pile foundation bearing platform structure can be efficiently and reliably constructed, cooperative work of the bearing platform body and the peripheral improved soil body is achieved, and therefore the purpose of improving the horizontal bearing capacity of the pile top is economically and effectively achieved.

Description

Technical Field

[0001] This invention relates to the field of stockpiling technology, and more specifically, to a stockpiling yard pile foundation structure and its construction method. Background Technology

[0002] Large stockpiles, such as coal storage yards and sand and gravel yards, are indispensable key facilities in construction, road, bridge, and water conservancy projects. These structures typically have huge spans (over 50 meters) and stockpiles reaching heights of 15 to 25 meters. When the stockpiles reach their designed height, they generate enormous horizontal thrust on the retaining wall. This horizontal thrust is ultimately transferred through the retaining wall foundation to the pile foundation beneath it, resulting in significant horizontal loads on the pile tops.

[0003] In existing technologies, pile foundations are commonly used at the base of retaining walls to address issues such as large support reactions and unfavorable geological conditions. However, if soft soil layers exist at the pile top, the horizontal bearing capacity of a single pile often becomes a controlling factor in the design. To ensure structural safety, traditional design methods typically involve increasing the number of piles or increasing the pile diameter. This not only results in a large surplus of vertical bearing capacity in the pile foundation, leading to material waste and poor economic efficiency, but may also cause construction difficulties due to excessively close pile spacing. Furthermore, controlling the horizontal deformation of the overall structure may also face challenges, posing certain safety hazards.

[0004] Therefore, there is a need for a construction method for pile foundation cap structures that can effectively improve the horizontal bearing capacity of a single pile, reduce the number of piles used, lower costs, and facilitate construction. Summary of the Invention

[0005] The purpose of this invention is to provide a pile foundation structure for a stockpile yard, which can improve the horizontal bearing capacity of a single pile, reduce the number of piles used, and lower costs.

[0006] Another objective of this invention is to provide a construction method for a pile foundation cap structure in a stockpile, which can efficiently and reliably construct the aforementioned pile foundation cap structure, realize the coordinated work of the pile foundation cap structure and the surrounding improved soil, and thus economically and effectively achieve the goal of improving the horizontal bearing capacity of the pile top.

[0007] The embodiments of the present invention are implemented as follows: This application provides a pile foundation cap structure for a stockpile, including a pile cap body made of reinforced concrete and engineering piles. The bottom surface of the pile cap body is fixedly connected to the engineering piles. An integrally cast haunch is provided on at least one lateral load-bearing end face of the pile cap body. The haunch extends laterally and vertically to increase the lateral load-bearing area and overall height of the pile foundation cap structure. A groove is formed around the main body of the foundation and the abutment, and improved soil is backfilled and compacted in the groove so that the improved soil is in close contact with the sides of the main body of the foundation and the abutment.

[0008] In some embodiments of the present invention, the above-mentioned axle portion includes a lateral extension portion, a connecting portion and a vertical extension portion. One side wall of the connecting portion is connected to the lateral extension portion. The main body of the abutment is located on the side of the connecting portion away from the lateral extension portion and is connected to the side wall of the connecting portion. The vertical extension portion is disposed on the bottom surface of the lateral extension portion and is on the same side as the engineering pile.

[0009] In some embodiments of the present invention, the connecting part is a trapezoidal structure, the lateral extension and the vertical extension are both rectangular structures, the side wall of the bottom side of the connecting part coincides with the side wall of the rectangular structure, the side wall of the top side of the connecting part coincides with the side wall of the main body of the support, and one side wall of the vertical extension coincides with the bottom wall of the lateral extension.

[0010] In some embodiments of the present invention, the slope of the inclined surface corresponding to the inclined side of the above-mentioned connecting part is between 1:2 and 1:1.5.

[0011] In some embodiments of the present invention, the width of the lateral extension is greater than 1 / 3 of the width of the main body of the pedestal and not less than 500 mm; the height of the vertical extension is greater than 1 / 2 of the height of the main body of the pedestal and not less than 500 mm.

[0012] In some embodiments of the present invention, a double-layer bidirectional steel mesh is provided in the above-mentioned haunch, and an oblique reinforcing rib is provided at the corner where it connects with the main body of the foundation.

[0013] Secondly, embodiments of this application provide a construction method for a stockpile pile foundation structure, comprising the following steps: Excavate a foundation pit at the predetermined location that is compatible with the main body of the pier cap and the abutment, and reserve a sump for the foundation. Pour a foundation layer inside the foundation pit; After the foundation layer has solidified, steel bars that are compatible with the main body of the foundation and the haunch are tied to the foundation layer. After the steel bars are tied, formwork that is compatible with the main body of the foundation and the haunch is erected around the steel bars to form a casting mold. Finally, concrete is poured into the casting mold to make the main body of the foundation and the haunch form an integral part. After the casting is completed, vibration compaction and curing are carried out in sequence. After curing is completed, the formwork is removed, and backfill material is filled into the fertilizer trench. The backfill material is then compacted in layers.

[0014] In some embodiments of the present invention, the backfill material is modified soil, which includes cement with a content of ≥10%.

[0015] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects: This invention provides a pile foundation cap structure for a stockpile yard. By adding a haunch to the main body of the cap, the horizontal bearing capacity of a single pile can be significantly improved. Under the same load, fewer piles are needed, effectively saving costs.

[0016] The present invention also provides a construction method for a pile foundation cap structure in a stockpile, which can efficiently and reliably construct the aforementioned pile foundation cap structure, realize the coordinated work of the pile foundation cap structure and the surrounding improved soil, and thus economically and effectively achieve the goal of improving the horizontal bearing capacity of the pile top. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural schematic diagram of one direction of an embodiment of the present invention; Figure 2 This is a three-dimensional structural schematic diagram of another embodiment of the present invention; Figure 3 This is a schematic diagram of the double-layer bidirectional steel mesh structure in an embodiment of the present invention; Figure 4 This is a schematic diagram of the installation structure according to an embodiment of the present invention.

[0019] Icons: 1-Pile cap body; 2-Half; 201-Lateral extension; 202-Vertical extension; 203-Connection; 3-Fertilizer trench; 4-Improved soil; 5-Double-layer bidirectional steel mesh; 6-Engineering pile; 7-Diagonal reinforcing bar. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] Example 1 Please refer to Figures 1-4 This embodiment provides a pile foundation structure for a stockpile yard, including a pile foundation body 1 made of reinforced concrete and engineering piles 6. The bottom surface of the pile foundation body 1 is fixedly connected to the engineering piles 6. An integrally cast haunch 2 is provided on at least one lateral load-bearing end face of the pile foundation body 1. The haunch 2 extends laterally and vertically to increase the lateral load-bearing area and overall height of the pile foundation structure. A trench 3 is formed around the pile foundation body 1 and the haunch 2. Improved soil 4 is backfilled and compacted in the trench 3, so that the improved soil 4 is in close contact with the sides of the pile foundation body 1 and the haunch 2.

[0023] According to Article 5.7.3 of the "Technical Code for Building Pile Foundations", the characteristic value of the horizontal bearing capacity of pile group foundations can be calculated using the following formula:

[0024] In the formula —Comprehensive coefficient of pile group; —Characteristic value of horizontal bearing capacity of a single pile.

[0025] Group pile comprehensive coefficient

[0026] In the formula —The coefficient of mutual influence effect of piles; —Pile top constraint effect coefficient; —Coefficient of lateral soil horizontal resistance effect of foundation structure.

[0027]

[0028] In the formula —The proportional coefficient of the lateral soil horizontal resistance coefficient of the foundation cap structure; —Allowable horizontal displacement of the pile top (foundation cap structure); —Calculated width of the side of the foundation structure subjected to lateral soil resistance; —Height of the foundation platform structure.

[0029] In summary, the above formula shows that the characteristic value of the horizontal bearing capacity of a single pile... Under fixed conditions, the characteristic value of the horizontal bearing capacity of pile group foundations Combined coefficient of pile group Positive correlation. And the mutual influence effect coefficient of the piles... and pile top constraint effect coefficient Under fixed conditions, the above-mentioned comprehensive coefficient of pile groups Lateral soil horizontal resistance effect coefficient of foundation structure Positive correlation. Finally, from the above formula, we can see the coefficient of lateral soil horizontal resistance effect of the foundation cap structure. The calculated width of the side of the foundation structure subjected to lateral soil resistance and Impact. Due to the actual construction process... The value is greater than 1. Therefore, increasing... and The value of can effectively improve the lateral soil horizontal resistance effect coefficient of the foundation structure, thereby improving the horizontal bearing capacity of a single pile foundation.

[0030] Therefore, in this embodiment, an integrally cast haunch 2 is provided on at least one lateral stress-bearing end face of the bearing platform body 1. The haunch 2 extends laterally and vertically, and the haunch 2 increases the aforementioned [features / enhancements] in its lateral extension. The value, while the addition of the armpit 2 vertical extension increases This significantly increases the lateral soil horizontal resistance coefficient of the foundation cap structure of a single pile foundation. This increases the horizontal bearing capacity of a single pile foundation. Therefore, under the same load, this embodiment requires fewer piles, effectively saving costs.

[0031] Furthermore, in this embodiment, the aforementioned fertilizer trench 3 is backfilled with improved soil 4 (in other embodiments, other soils with good quality can also be used for backfilling), and the compaction coefficient is not less than 0.97. According to Table 5.7.5 of the "Code for Design of Building Pile Foundations," the proportional coefficient of the horizontal resistance coefficient of the foundation soil is... Improved soil 4 Value compared to ordinary soil The value is larger, as can be seen from the above formula, increasing... Value can increase This further increases the horizontal bearing capacity of the pile foundation. Additionally, compacting the soil around the main body of the pile cap can also increase the bearing capacity. This further increases the horizontal bearing capacity of the pile foundation.

[0032] Please refer to Figure 1 and Figure 2 Furthermore, in this embodiment, the aforementioned axle portion 2 includes a lateral extension portion 201, a connecting portion 203, and a vertical extension portion 202. One side wall of the connecting portion 203 is connected to the lateral extension portion 201. The foundation body 1 is located on the side of the connecting portion 203 away from the lateral extension portion 201 and is connected to the side wall of the connecting portion 203. The vertical extension portion 202 is disposed on the bottom surface of the lateral extension portion 201 and is on the same side as the engineering pile 6.

[0033] Specifically, the aforementioned lateral extension 201 extends horizontally in a direction away from the center of the main body 1 of the foundation, and its length is determined by the calculated width based on actual needs. The value is determined to effectively increase the calculated width of the side of the foundation cap structure subjected to lateral soil resistance. The connecting part 203 is a plate-like structure perpendicular to the lateral extension 201 and the foundation body 1, serving to stably connect the lateral extension 201 and the foundation body 1. The vertical extension 202 extends vertically downwards, and its extension height is set according to actual needs. The value is determined, and can be increased. The value of this increases the lateral soil horizontal resistance coefficient of the foundation structure. This structural design allows the haunch 2 to better exert its effect. and The value increases the lateral soil horizontal resistance effect coefficient of the foundation cap structure of a single pile foundation, thereby enhancing the horizontal bearing capacity of the single pile foundation.

[0034] Please refer to Figure 1 and Figure 2 Furthermore, the connecting part 203 is a trapezoidal structure, the lateral extension 201 and the vertical extension 202 are both rectangular structures, the lower side wall of the connecting part 203 coincides with the side wall of the rectangular structure, the upper side wall of the connecting part 203 coincides with the side wall of the support body 1, and one side wall of the vertical extension 202 coincides with the bottom wall of the lateral extension 201.

[0035] The connecting part 203 of the trapezoidal structure can reduce material usage and lower costs while ensuring connection strength. The lateral extension 201 and vertical extension 202 of the rectangular structure are easy to process and install, which helps to improve construction efficiency. At the same time, the overlapping connection between the parts further enhances the integrity and stability of the main body 1 and the abutment 2 after they are integrally formed.

[0036] Optionally, the slope of the inclined side of the connecting part 203 is between 1:2 and 1:1.5. This slope design allows the connecting part 203 to evenly distribute the horizontal force to the main body 1 and the haunch 2, avoiding localized stress concentration. Simultaneously, this slope range also considers ease of construction and material utilization, ensuring both performance and high economic efficiency. In practical applications, a suitable slope ratio can be selected within this range based on specific engineering requirements and geological conditions.

[0037] Optionally, the width of the lateral extension 201 is greater than one-third of the width of the main body 1 of the foundation, and not less than 500 mm; the height of the vertical extension 202 is greater than half the height of the main body 1 of the foundation, and not less than 500 mm. This dimensional arrangement ensures that the lateral extension 201 and the vertical extension 202 provide sufficient support in the overall structure. When the width of the lateral extension 201 is greater than one-third of the width of the main body 1 of the foundation, and not less than 500 mm, it can better transmit and disperse forces when subjected to horizontal external forces, enhancing the ability of the main body 1 of the foundation to resist horizontal forces and preventing excessive deformation or damage to the main body 1 of the foundation due to horizontal forces. The height of the vertical extension 202 is greater than half the height of the main body 1 of the foundation, and not less than 500 mm, effectively increasing the stability of the structure in the vertical direction, providing reliable vertical support for the pile foundation, ensuring that the entire pile foundation structure remains stable under different stress conditions, improving the horizontal bearing capacity of the pile top in the stockpile yard, and meeting the actual needs of the project.

[0038] Please refer to Figure 3 It is worth noting that in this embodiment, a double-layer bidirectional steel mesh 5 is provided inside the aforementioned haunch 2, and a diagonal reinforcing bar 7 is provided at the corner where it connects to the main body 1 of the foundation. The aforementioned haunch reinforcement meets the requirements for seismic tensile anchorage length. The diagonal reinforcing bar 7, with the same diameter as the main reinforcement and extending into the original main body 1, is provided at the corner of the haunch to facilitate anchorage and prevent cracking caused by stress concentration.

[0039] Example 2 Please refer to Figure 4 This embodiment provides a construction method for a pile foundation cap structure in a stockpile, including the following steps: excavating a foundation pit at a predetermined location that matches the main body 1 and the haunch 2, and reserving a trench 3; pouring a cushion layer in the foundation pit; after the cushion layer solidifies, tying reinforcing bars that match the main body 1 and the haunch 2 onto the cushion layer; after completing the tying of the reinforcing bars, setting up formwork around the reinforcing bars that matches the main body 1 and the haunch 2 to form a casting mold; finally, pouring concrete into the casting mold to integrally form the main body 1 and the haunch 2; after pouring, sequentially vibrating and compacting and curing are performed; after curing, removing the formwork and filling the trench with backfill material layer by layer, compacting the backfill material in layers during filling. The above construction method can efficiently and reliably construct the aforementioned pile foundation cap structure, realizing the coordinated work of the main body 1 and the surrounding improved soil, thereby economically and effectively achieving the goal of improving the horizontal bearing capacity of the pile top.

[0040] Preferably, the backfill material is modified soil, which includes ≥10% cement. This embodiment uses modified soil containing 10% cement. This modified soil has a larger proportional coefficient for the lateral soil horizontal resistance coefficient of the foundation structure, thus improving the horizontal bearing capacity of the pile foundation.

[0041] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A pile foundation cap structure for a stockpile yard, comprising a pile cap body made of reinforced concrete and engineering piles, wherein the bottom surface of the pile cap body is fixedly connected to the engineering piles, characterized in that: An integrally cast haunch is provided on at least one lateral stress-bearing end face of the main body of the foundation, the haunch extending laterally and vertically; A groove is formed around the main body of the foundation and the abutment, and improved soil is backfilled and compacted in the groove so that the improved soil is in close contact with the sides of the main body of the foundation and the abutment.

2. The stockpile yard pile foundation structure according to claim 1, characterized in that, The axle portion includes a lateral extension, a connecting portion, and a vertical extension. One side wall of the connecting portion is connected to the lateral extension. The main body of the abutment is located on the side of the connecting portion away from the lateral extension and is connected to the side wall of the connecting portion. The vertical extension is disposed on the bottom surface of the lateral extension and is on the same side as the engineering pile.

3. The stockpile yard pile foundation structure according to claim 2, characterized in that, The connecting part is a trapezoidal structure, and the lateral extension and the vertical extension are both rectangular structures. The side wall of the bottom of the connecting part coincides with the side wall of the rectangular structure, the side wall of the top of the connecting part coincides with the side wall of the main body of the support, and one side wall of the vertical extension coincides with the bottom wall of the lateral extension.

4. The stockpile yard pile foundation structure according to claim 3, characterized in that, The slope of the inclined surface corresponding to the inclined side of the connecting part is between 1:2 and 1:1.

5.

5. The stockpile yard pile foundation structure according to claim 2, characterized in that, The width of the lateral extension is greater than 1 / 3 of the width of the main body of the foundation, and not less than 500mm; the height of the vertical extension is greater than 1 / 2 of the height of the main body of the foundation, and not less than 500mm.

6. The stockpile yard pile foundation structure according to claim 1, characterized in that, The armhole is provided with a double-layer bidirectional steel mesh, and a diagonal reinforcing bar is provided at the corner where it connects with the main body of the foundation.

7. A construction method for a pile foundation cap structure in a stockpile yard, characterized in that, Includes the following steps: Excavate a foundation pit at the predetermined location that is compatible with the main body of the pier cap and the abutment, and reserve a sump for the foundation. Pour a foundation layer inside the foundation pit; After the foundation layer has solidified, steel bars that are compatible with the main body of the foundation and the haunch are tied to the foundation layer. After the steel bars are tied, formwork that is compatible with the main body of the foundation and the haunch is erected around the steel bars to form a casting mold. Finally, concrete is poured into the casting mold to make the main body of the foundation and the haunch form an integral part. After the casting is completed, vibration compaction and curing are carried out in sequence. After the curing is completed, the formwork is removed, and the backfill material is filled into the fertilizer trench layer by layer. When filling, the backfill material is compacted in layers.

8. The construction method for the pile foundation cap structure of the stockpile yard according to claim 7, characterized in that, The backfill material is modified soil, which includes cement with a content of ≥10%.

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