Fabricated prefabricated square pile wall assembly

Abstract

The utility model discloses an assembly type prefabricated square pile wall assembly which comprises a prefabricated square pile, hollow steel pipes which are coaxially distributed are arranged in the center area of the prefabricated square pile, lock catch structures are arranged on at least two side faces of the prefabricated square pile, and the prefabricated square pile is fixedly connected in a matched mode through the lock catch structures. The assembly can effectively stop water, does not need to be provided with a lining structure, is high in standardization degree, short in construction period, good in economical efficiency, energy-saving, environment-friendly, convenient and reliable to assemble and high in applicability, improves the standardization degree of an open excavation supporting structure, is more beneficial to field assembly, is good in integrity and stress stability, effectively guarantees perpendicularity, improves the construction speed, and reduces the construction cost. The deformation of the supporting structure and the ground is effectively reduced, the safety of the surrounding environment is better protected, and the engineering investment is greatly reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of open excavation foundation pit support, and specifically relates to an assembled prefabricated square pile wall component. Background Art

[0002] With the continuous development of my country's urbanization process, the development of underground space has shown a rapid development momentum. The construction of underground projects such as underground pedestrian walkways, integrated pipeline corridors, and cable trenches is affected by factors such as the current difficulties in traffic organization and the protection of existing underground pipelines. They are more often implemented by dark excavation. The working shafts at both ends often adopt open excavation methods, and are subsequently used as maintenance working shafts or ventilation shaft structures. The selection of the enclosure structure and main structure of the open excavation working shaft is related to safety and economic indicators, and has become the key to the success or failure of the project.

[0003] For traditional open excavation pits, the current engineering practice usually adopts the form of retaining structure + main structure support. The retaining structure is only a temporary structure. After years of engineering practice and demonstration, the following problems have been found: (1) Retaining structure + main structure. The force calculation of the main structure does not take into account the role of the retaining structure, the overall cost is high, and the cost performance is relatively poor; (2) Retaining structure + main structure. The construction steps are many and cumbersome, the construction period is long, and the impact on the surrounding traffic and environment is great; (3) The calculation of the retaining structure does not take into account the structural importance coefficient, the sub-item coefficient is smaller than the operating condition, and the groundwater level is selected as the anti-floating water level of a certain number of years. In special circumstances, there are problems with the safety of the retaining structure; (4) The verticality of the retaining structure construction is poorly guaranteed, which often causes intrusion, resulting in the thickness of the main structure wall not meeting the design requirements, cracks exceeding the standard, and affecting the durability performance; (5) The degree of standardization is low, the production efficiency is low, and the energy-saving and environmental protection indicators are poor. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide an assembled prefabricated square pile wall component to solve the deficiencies in the prior art.

[0005] In order to achieve the above object, the utility model is implemented by the following technical solutions:

[0006] Provided is an assembled prefabricated square pile wall component, comprising prefabricated square piles, wherein coaxially distributed hollow steel pipes are arranged in the central region of the prefabricated square piles, and locking structures are provided on at least two side surfaces of the prefabricated square piles, and the prefabricated square piles are fixedly connected by the locking structures.

[0007] As in the assembled prefabricated square pile wall assembly, the sides of the prefabricated square piles provided with the locking structure are provided with square pile structural reinforcements at equal intervals, and the sides of the prefabricated square piles not provided with the locking structure are provided with square pile main reinforcements at equal intervals.

[0008] As described in the assembled prefabricated square pile wall assembly, the locking structure includes locking grooves and locking members distributed along the axial direction of the prefabricated square piles. The shape and size of the locking members are adapted to the internal hollow structure formed when two locking grooves are connected facing each other, and the grouting body is sealed in the locking members.

[0009] As described in the assembled prefabricated square pile wall assembly, the locking groove is composed of a circular arc steel pipe and two parallel strip steel plates, the circular arc steel pipe has an opening on the outward side, the two strip steel plates are respectively located at the two ends of the opening of the circular arc steel pipe and are perpendicular to the corresponding sides of the prefabricated square piles, the locking part includes a locking steel pipe and a connecting steel plate, the locking steel pipes are respectively located at the two ends of the connecting steel plates, and the central area of ​​the locking steel pipe is arranged with coaxially distributed grouting holes.

[0010] The beneficial effects of the technical solution of the utility model are:

[0011] It can effectively stop water without setting up an inner lining structure, has a high degree of standardization, a short construction period, good economy, energy saving and environmental protection, convenient and reliable assembly, and strong applicability. This component improves the standardization of the open-cut support structure, is more conducive to on-site assembly, has good integrity and force stability, effectively ensures verticality, improves construction speed, effectively reduces deformation of the support structure and the ground, is more conducive to protecting the safety of the surrounding environment, and greatly reduces project investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] To further illustrate the above-mentioned purpose, structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.

[0013] Figure 1 This is a schematic diagram of the structure of the assembled prefabricated square pile wall assembly of a preferred embodiment of the utility model;

[0014] Figure 2 This is a schematic diagram of the structure of the prefabricated square pile reinforcement corner member of the preferred embodiment of the utility model;

[0015] Figure 3 This is a schematic diagram of the structure of a standard member for prefabricated square pile reinforcement according to a preferred embodiment of the utility model;

[0016] Figure 4 This is a schematic diagram of the lock connection point structure of a preferred embodiment of the utility model;

[0017] Figure 5 This is a schematic diagram of the combination of the assembled prefabricated square pile wall and the internal structure of the preferred embodiment of the utility model;

[0018] Figure 6 This is a schematic diagram of the lock slot structure of a preferred embodiment of the utility model;

[0019] Figure 7This is a schematic diagram of the structure of a lock component in a preferred embodiment of the utility model;

[0020] In the figure: 0, sealing grouting body inside the lock; 0', grouting inside the hollow steel pipe; 1, prefabricated square pile; 2, hollow steel pipe; 3, square pile structural reinforcement; 4, square pile main reinforcement; 5, lock groove; 6, lock piece; 7, arc steel pipe; 8, strip steel plate; 9, lock steel pipe; 10, connecting steel plate; 11, grouting hole. DETAILED DESCRIPTION

[0021] The terms "utility model" and "the present utility model" used in this specification are intended to refer broadly to all subject matter of this specification and any patent claims below. Statements containing these terms should not be understood to limit the subject matter described herein or to limit the meaning or scope of any patent claim below. In addition, this specification does not attempt to describe or limit the subject matter covered by any claim of any specific component, paragraph, statement or figure of this application. The subject matter should be understood with reference to the entire specification, all drawings and any claims below. The present utility model may have other embodiments and be practiced or implemented in other ways. Moreover, it should be understood that the wording and terminology used herein are for illustrative purposes and should not be considered as limiting.

[0022] The details of the present invention will now be discussed with reference to the accompanying drawings which illustrate the present invention by way of example only. In the accompanying drawings, similar features or components may be marked with the same reference numerals.

[0023] The use of "including", "having" and "comprising" and variations thereof herein is meant to include the items listed thereafter and their equivalents and additional items. Although reference may be made to directions such as above, below, upward, downward, backward, bottom, top, front, back, etc. in describing the drawings, for convenience, reference is made relative to the drawings. These directions are not intended to literally accept or limit the present invention in any form. In addition, terms such as "first", "second", "third", etc. are used herein for illustrative purposes and are not intended to indicate or imply importance or significance.

[0024] See also Figures 1 to 7 As shown, the assembled prefabricated square pile wall component of the utility model includes a prefabricated square pile 1, a coaxially distributed hollow steel pipe 2 is arranged in the central area of ​​the prefabricated square pile 1, at least two side surfaces of the prefabricated square pile 1 are provided with a locking structure, and the prefabricated square pile 1 is fixedly connected through the locking structure.

[0025] See also Figure 2 , Figure 3 As shown, square pile structural reinforcements 3 are arranged at equal intervals on the sides of the prefabricated square pile 1 with the locking structure, and square pile main reinforcements 4 are arranged at equal intervals on the sides of the prefabricated square pile 1 without the locking structure.

[0026] In a preferred embodiment, the locking structure includes locking grooves 5 and locking members 6 distributed axially along the prefabricated square pile 1. The shape and size of the locking members 6 are adapted to the internal hollow structure formed when two locking grooves 5 are connected to each other, and the locking members 6 seal the grouting body.

[0027] Further, see Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the locking groove 5 is composed of a circular arc steel pipe 7 and two parallel strip steel plates 8. The circular arc steel pipe 7 has an opening on one side facing outward. The two strip steel plates 8 are respectively located at the two ends of the opening of the circular arc steel pipe 7 and are perpendicular to the side surfaces of the corresponding prefabricated square piles 1. The locking member 6 includes a locking steel pipe 9 and a connecting steel plate 10. The locking steel pipe 9 is respectively located at the two ends of the connecting steel plate 10. The central area of ​​the locking steel pipe 9 is arranged with coaxially distributed grouting holes 11.

[0028] In terms of size, the cross-section of the prefabricated square pile 1 is preferably square. The size should be determined according to the force requirements, and the side length should not be less than 400mm. The concrete grade is determined according to the force, waterproof grade and durability, and it is prefabricated in the factory. The hollow steel pipe 2 is a conventional steel pipe with an outer diameter of not less than 200mm, and the thickness of the concrete outside the steel pipe should be not less than 100mm. The wall thickness of the steel pipe is recommended to be not less than 10mm. The wall thickness of the arc steel pipe 7 of the lock groove 5 is not less than 6mm, and the inner diameter is recommended to be not less than 50mm. The longitudinal length is the same as the length of the square pile. The thickness of the strip steel plate 8 is the same as the arc steel pipe 7. The cross-sectional width is not less than the thickness of the square pile steel bar protective layer. The clearance between the two strip steel plates 8 should not be less than 15mm. The longitudinal length is the same as the length of the square pile. It is welded to the arc steel pipe 7 and pre-buried in the square pile. The grouting 0' in the hollow steel pipe is conventional cement mortar or cement slurry, which is densely filled, anti-corrosive and can increase the stiffness of the square pile to a certain extent. The main force reinforcement 4 of the square pile is configured according to the force calculation, some stirrups need to be effectively welded with the locking groove 5, and the structural reinforcement 3 of the square pile is a structural reinforcement, which meets the requirements of relevant specifications.

[0029] The locking steel pipe 9 is a conventional steel pipe, the inner diameter should not be less than 32mm, the wall thickness should not be less than 5mm, the outer diameter is 4-8mm smaller than the inner diameter of the arc steel pipe 7 in the locking groove 5, and the longitudinal length is the same as the length of the square pile. The connecting steel plate 10 is a rectangular steel plate, which is welded to the locking steel pipe 9 on both sides. The thickness of the steel plate is recommended to be not less than 10mm, and the net distance should be 4-8mm smaller than the strip steel plate 8 of the locking groove 5. The grouting holes 11 are set on the locking steel pipe 9, the hole diameter should not be less than 5mm, and the circumferential spacing is arranged, and the vertical ring spacing is preferably 0.5-1.5m. The models and sizes of steel pipes, steel plates and grouting holes should include all ranges that meet the requirements of the project.

[0030] The sealing grouting body 0 inside the lock is the cement grouting filling range, and the materials and grouting construction parameters should include all ranges that meet the engineering requirements.

[0031] The arc steel pipe 7 and the strip steel plate 8 of the locking groove 5, the locking steel pipe 9 and the connecting steel plate 10, and the square pile stirrups and the locking groove 5 are all welded. The weld height is determined based on calculation and is not less than 6mm in structure.

[0032] The assembled prefabricated square pile wall assembly used in this embodiment is a cable trench top pipe working well, which will also serve as an inspection well in the future. The bottom plate is buried at a depth of about 10m, the internal clearance requirement is 6.0×10.0m (width×length), the top plate is covered with soil about 3.8m, the stratum is mainly silty clay and clay, and the anti-floating groundwater level is 2.0m below the ground.

[0033] Step 1: According to calculation, the length of the prefabricated square pile 1 is 16.5m, the cross-sectional size is 0.5×0.5m, the concrete is C35, the impermeability grade is P6, the main reinforcement 4 of the standard section square pile is 9 E22, the stirrup is a 4-legged stirrup, the stirrup diameter is E12, and the square pile structural reinforcement 3 is configured according to the specification requirements. The hollow steel pipe 2 uses a seamless steel pipe with a diameter of 270mm and a wall thickness of 10mm, the arc steel pipe 7 in the lock groove 5 uses a steel pipe with a diameter of 60mm and a wall thickness of 5mm, the strip steel plate 8 uses a steel plate with a width of 15mm and a thickness of 5mm, and the clearance between the two strip steel plates 8 is 16mm. After the welding of the components of the lock groove 5 is completed, they are welded to the square pile reinforcement. According to the force calculation results, the plate stress reinforcement connector is embedded in the corresponding positions of the top plate and the bottom plate, and the prefabrication production is centralized, and the maintenance meets the design requirements.

[0034] Step 2: According to the model of the locking groove 5, the locking steel pipe 9 in the locking part 6 uses a steel pipe with a diameter of 45mm and a wall thickness of 4mm. The connecting steel plate 10 uses a steel plate with a width of 45mm and a thickness of 10mm. The connecting steel plate 10 and the locking steel pipe 9 are double-sided groove welded, and the weld height is 6mm. Grouting holes 11 are reserved in advance in the locking steel pipe 9. The diameter of the grouting holes 11 is 5mm, and they are arranged at intervals in the annular direction. The vertical ring distance is 1.0m, and they are uniformly processed and manufactured.

[0035] Step 3: transport the prefabricated square piles 1 and the locking parts 6 to the construction site, accurately locate the corner components, statically pressurize the corner components, and after reaching the set depth, install the locking parts 6 on the docking side of the standard section prefabricated square piles and the completed square piles, align them with the locking grooves 5 on the completed square piles, and simultaneously pressurize the construction together with the locking parts 6 to ensure effective buckling and effective control of verticality, so that the square piles are effectively connected, and the construction is carried out in sequence.

[0036] Step 4: Complete the overall wall construction, pour cement slurry into the gap between the lock groove 5 and the lock piece 6 and the lock steel pipe 9, use 1:1 cement slurry, grouting pressure 0.2-0.5MPa, final pressure 0.5MPa, and pressure stabilization time not less than 10 minutes. Pour cement mortar into the hollow steel pipe 2, strength grade M20, adopt a backward pouring method to ensure the pouring quality, and finally form an overall retaining wall, excavate the soil in the pit, reverse the construction top plate, continue excavation after effective support, and close the bottom of the pit in time and apply the bottom plate to finally form a working well structure.

[0037] The components in the above embodiments are not limited to those shown in the figures, and can be adjusted according to the specific conditions of the project and on-site installation conditions. The adjustment principle is to facilitate on-site installation, to bear force reasonably, to meet the requirements of bearing capacity and stability, and to include all size ranges that meet the requirements of the project.

[0038] In the technical solution of the utility model, the components are installed and connected by welding. The height and quality of the welds during the welding process must meet the requirements of the current relevant specifications, and the welds must meet the bearing capacity and structural requirements. If necessary, the welds must be inspected in accordance with the relevant specifications and can only be implemented after passing the inspection.

[0039] The above are only preferred embodiments of the present invention, and do not limit the implementation mode and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. An assembled prefabricated square pile wall assembly, characterized in that: The prefabricated square pile comprises a prefabricated square pile, wherein a coaxially distributed hollow steel pipe is arranged in the central area of ​​the prefabricated square pile, and a locking structure is provided on at least two side surfaces of the prefabricated square pile, and the prefabricated square pile is fixedly connected by the locking structure.

2. The prefabricated square pile wall assembly according to claim 1, characterized in that: Square pile structural reinforcements are arranged at equal intervals on the sides of the prefabricated square piles provided with the locking structure, and square pile main reinforcements are arranged at equal intervals on the sides of the prefabricated square piles not provided with the locking structure.

3. The prefabricated square pile wall assembly according to claim 2, characterized in that: The locking structure comprises locking grooves and locking members distributed along the axial direction of the prefabricated square piles. The shape and size of the locking member are adapted to the internal hollow structure formed when two locking grooves are butted against each other. The locking member seals the grouting body.

4. The prefabricated square pile wall assembly according to claim 3, characterized in that: The locking groove is composed of a circular arc steel pipe and two parallel strip steel plates. The circular arc steel pipe has an opening on the outward side. The two strip steel plates are respectively located at the two ends of the opening of the circular arc steel pipe and are perpendicular to the corresponding sides of the prefabricated square piles. The locking part includes a locking steel pipe and a connecting steel plate. The locking steel pipes are respectively located at the two ends of the connecting steel plates. The central area of ​​the locking steel pipe is arranged with coaxially distributed grouting holes.

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