A structure and construction method of a large-section prefabricated assembled box culvert suitable for cold and arid regions

Abstract

The application relates to the technical field of water conservancy projects, and discloses a large-section prefabricated and assembled box culvert structure suitable for cold and arid areas and a construction method, a top plate unit comprises a plurality of sequentially connected first prefabricated components, the first prefabricated components are in overall H-shaped structures, and the two sides of the first prefabricated components are provided with first joints at bottom ends; a bottom plate unit comprises a plurality of sequentially connected third prefabricated components, the two sides of the third prefabricated components are provided with third joints; a side wall unit comprises a plurality of sequentially connected second prefabricated components, the second prefabricated components are in overall L-shaped structures; one side end of the second prefabricated component is provided with a second upper joint matched with the first joint, and the other side end is provided with a second lower joint matched with the third joint. The box culvert is split into a plurality of H-shaped first prefabricated components, a plurality of L-shaped second prefabricated components and a plurality of third prefabricated components, the size and weight of a single prefabricated component are reduced, and the engineering implementation difficulties of the large-section box culvert in the prefabrication, transportation and on-site hoisting processes are solved.

Description

Technical Field

[0001] This invention relates to the field of water conservancy engineering technology, specifically to a prefabricated box culvert structure and construction method suitable for cold and arid regions. Background Technology

[0002] Box culverts are a mature structural form widely used in highway and municipal engineering, with relatively mature design and construction technologies. In contrast, the application of prefabricated box culverts in water conservancy projects, especially long-distance water conveyance projects, is relatively limited, and related structural forms and design methods are still immature. With the continuous expansion of water resource allocation projects, water conveyance systems are showing a trend towards longer conveyance distances, larger design flows, and increasingly larger structural cross-sectional dimensions, placing higher demands on construction efficiency, engineering adaptability, and operational safety. Traditional cast-in-place or precast box culverts suffer from long construction cycles, significant limitations imposed by construction conditions, and high difficulty in quality control under complex environmental conditions, gradually failing to meet engineering requirements. To improve construction efficiency and engineering adaptability, precast assembled box culverts are gaining increasing attention. However, existing precast assembled box culverts are mostly used in small-to-medium cross-section structures. Under large cross-section conditions, the size and weight of individual components increase significantly, the component division method becomes more complex, and the stress performance of the joint connections and the overall structural collaborative working mechanism are still unclear. This results in deficiencies in the load-bearing capacity and applicability of existing structural forms, making it difficult to meet the application requirements of long-distance, high-flow water conveyance projects.

[0003] Therefore, there is an urgent need for a prefabricated box culvert structure and construction method with large cross-section suitable for cold and arid regions. Summary of the Invention

[0004] In view of this, the present invention provides a prefabricated box culvert structure and construction method with large cross-section suitable for cold and arid regions, in order to solve the problems mentioned in the background art, and specifically discloses the following contents: A prefabricated box culvert structure with large cross-section suitable for cold and arid regions includes a top slab unit, a bottom slab unit, and two symmetrically arranged side wall units; The top plate unit includes multiple first prefabricated components connected axially in sequence. The first prefabricated components are generally U-shaped structures, and each of the bottom ends on both sides of the first prefabricated components is provided with a first joint. The base plate unit includes multiple third prefabricated components connected axially in sequence, and each third prefabricated component has a third joint on both sides; The side wall unit includes multiple second prefabricated components connected axially in sequence. The second prefabricated components are generally L-shaped. One end of the second prefabricated component is provided with a second upper connector that is adapted to the first connector, and the other end is provided with a second lower connector that is adapted to the third connector.

[0005] Furthermore, the first connector and the second upper connector are connected by a socket joint.

[0006] Furthermore, the second lower connector and the third connector are connected by a tongue and groove joint.

[0007] Furthermore, the first prefabricated components that are axially adjacent are connected by an axial connection structure; the third prefabricated components that are axially adjacent are connected by an axial connection structure; and the second prefabricated components that are axially adjacent are connected by an axial connection structure.

[0008] Furthermore, the second precast component is provided with a water-stopping strip near the second upper connector and near the second lower connector, and the first precast component and the third component are respectively provided with corresponding strip grooves.

[0009] A construction method for large-section prefabricated box culvert structures suitable for cold and arid regions, utilizing any of the above-mentioned methods for large-section prefabricated box culvert structures suitable for cold and arid regions, specifically includes the following steps: S1: Component division and prefabrication Based on the engineering design requirements and on-site survey data, the cross-sectional dimensions of the box culvert were determined, and the box culvert was divided into a top slab unit, a bottom slab unit, and two symmetrically arranged side wall units. The segment lengths were determined, and the top slab unit was divided into multiple first precast components, the bottom slab unit into multiple third precast components, and the side wall unit into multiple second precast components. The length of a single component segment was 2-4m. After the precast components were completed in the factory, they were transported to the construction site. S2: Excavation and foundation treatment of the foundation pit Excavation of the foundation pit is carried out at the construction site, and the foundation is inspected and treated; soft soil layers, local weak areas or cavities are replaced or reinforced to ensure that the bearing capacity of the foundation meets the design requirements; the foundation is leveled, rolled and compacted, and the flatness of the foundation is controlled within ±10mm; drainage or diversion measures are taken for areas with water accumulation to ensure that the foundation is dry and stable. S3: Subbase construction and installation positioning A bedding layer is laid and compacted on the treated base, with a thickness of 100-300mm. An installation datum line or component projection positioning point corresponding to the box culvert axis and cross-sectional contour is set on the surface of the bedding layer to define the planar installation position of the third precast component. Its planar positioning error is controlled within ±5mm. At the same time, a waterproof structure is pre-set at the third joint position corresponding to the third precast component to prevent groundwater from seeping through the joint during the operation of the box culvert and improve the water tightness of the overall structure. S4: Hoisting and positioning of the third precast component Multiple third precast components are hoisted onto the surface of the subbase, and then connected axially to form a base plate unit. The vertical elevation of the components is controlled in one go during the subbase construction, with the elevation deviation controlled within ±5mm. When the components are in contact with the subbase, the planar position and angular direction of the third precast components are corrected by adjusting the hoisting posture and making slight in-plane movements along the surface of the subbase. The horizontal position deviation is controlled within ±5mm, and the angular deviation is controlled within ±0.5°, so as to meet the requirements for joint closure when assembling the second precast components. S5: Assembly of the second prefabricated component Multiple second precast components are hoisted to both sides of the third precast component, so that the multiple second precast components are connected axially to form a side wall unit. Under the hoisting state, they are aligned so that the second lower joint of the second precast component and the third joint of the third precast component form a tongue and groove connection. The joint gap is controlled within the range of 5-15mm to meet the subsequent sealing or grouting requirements, thereby completing the assembly of the box culvert substructure. S6: Assembly of the first prefabricated component After the lower structure of the box culvert is assembled, temporary support measures are set up for the lower structure according to construction needs. Then, multiple first precast components are hoisted above the second precast components. The multiple first precast components are connected axially to form a top plate unit and aligned under hoisting conditions so that the first joint of the first precast component and the second upper joint of the second precast component form a socket connection. S7: Waterproofing and backfilling construction After all the box culvert segments were assembled, waterproofing was carried out on the side wall units and the top slab units. Then, backfilling was carried out in layers and compacted to complete the construction of the box culvert structure.

[0010] Furthermore, in steps S5 and S6, the third precast component, the second precast component, and the first precast component are assembled in a staggered arrangement in the axial direction, with the stagger distance being no less than 1 / 3 of the segment length, in order to improve the overall integrity of the longitudinal structure.

[0011] The beneficial effects of this invention are as follows: (1) In view of the problems of transportation difficulties, high hoisting requirements and long construction period in the overall prefabrication and cast-in-place construction of large cross-section box culverts, the present invention proposes a structural form of large cross-section multi-component combination. By splitting the box culvert into multiple U-shaped first prefabricated components, multiple L-shaped second prefabricated components and multiple third prefabricated components, the size and weight of individual prefabricated components are effectively reduced, solving the engineering implementation problems of large cross-section box culverts in the prefabrication, transportation and on-site hoisting process, reducing the need for large hoisting equipment and improving construction efficiency.

[0012] (2) The multi-component cross-section combination form adopted in this invention enables the first prefabricated component, the second prefabricated component and the third prefabricated component to form a closed box-shaped structure that supports each other and is subjected to force in the cross-section direction, which improves the stability and stress rationality of the overall structure of the assembled box culvert, and is conducive to controlling structural deformation and ensuring the stress coordination of each joint.

[0013] (3) In this invention, the first joint and the second upper joint adopt a socket connection, and the second lower joint and the third joint adopt a tongue and groove connection. They can be combined with prestressing measures and joint waterproofing treatment, so that the box culvert assembled in sections can meet the requirements of rapid assembly while taking into account the structural integrity, water tightness and durability, and reducing the risk of leakage and performance degradation of the assembled structure during long-term service. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of the first component in this invention.

[0016] Figure 2 This is a schematic diagram of the structure of the second component in this invention.

[0017] Figure 3 This is a schematic diagram of the structure of the third component in this invention.

[0018] Figure 4 This is a schematic diagram of the connection between the first connector and the second upper connector in this invention.

[0019] Figure 5 This is a schematic diagram showing the connection between the second lower connector and the third connector in this invention.

[0020] Figure 6 This is a schematic diagram of the assembly and construction of Embodiment 1 in this invention.

[0021] Figure 7 This is a schematic diagram of the assembly and construction of Embodiment 2 in this invention.

[0022] In the figure: 1-First precast component; 11-First joint; 2-Second precast component; 21-Second upper joint; 22-Second lower joint; 3-Third precast component; 31-Third joint; 4-Rubber strip groove; 5-Water-stop rubber strip. Detailed Implementation

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be used interchangeably where appropriate for the purposes of describing embodiments of this application herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or components is not necessarily limited to those explicitly listed, but may include other steps or components not explicitly listed or inherent to such processes, methods, products, or devices.

[0025] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0026] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0027] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0028] Example 1: See appendix Figure 1-6 This invention discloses a prefabricated box culvert structure with large cross-section suitable for cold and arid regions, including a top plate unit, a bottom plate unit, and two symmetrically arranged side wall units; The top slab unit includes multiple first prefabricated components 1 connected axially in sequence. The first prefabricated component 1 has a U-shaped structure as a whole, and the bottom ends of both sides of the first prefabricated component 1 are provided with first joints 11. The base plate unit includes multiple third prefabricated components 3 connected axially in sequence, and third joints 31 are provided on both sides of the third prefabricated components 3; The side wall unit includes multiple second prefabricated components 2 connected axially in sequence. The second prefabricated components 2 are generally L-shaped. One end of the second prefabricated component 2 is provided with a second upper connector 21 that is adapted to the first connector 11, and the other end is provided with a second lower connector 22 that is adapted to the third connector 31.

[0029] The first connector 11 and the second upper connector 21 are connected by a socket joint.

[0030] The second connector 22 and the third connector 31 are connected by tongue and groove joints.

[0031] The first prefabricated components 1 that are axially adjacent are connected by a socket joint through an axial connection structure; the third prefabricated components 3 that are axially adjacent are connected by a socket joint through an axial connection structure; the second prefabricated components 2 that are axially adjacent are connected by a socket joint through an axial connection structure.

[0032] Water-stopping strips 5 are provided on the second precast component 2 near the second upper connector 21 and near the second lower connector 22. Corresponding grooves 4 are provided on the first precast component 1 and the third component.

[0033] A construction method for large-section prefabricated box culvert structures suitable for cold and arid regions includes the following steps: S1: Component division and prefabrication Based on the engineering design requirements and on-site survey data, the cross-sectional dimensions of the box culvert were determined, and the box culvert was divided into a top slab unit, a bottom slab unit, and two symmetrically arranged side wall units. The segment lengths were determined, and the top slab unit was divided into multiple first precast components 1, the bottom slab unit was divided into multiple third precast components 3, and the side wall unit was divided into multiple second precast components 2. The length of a single component segment was 2-4m. After the precast components were completed in the factory, they were transported to the construction site. S2: Excavation and foundation treatment of the foundation pit Excavation of the foundation pit is carried out at the construction site, and the foundation is inspected and treated; soft soil layers, local weak areas or cavities are replaced or reinforced to ensure that the bearing capacity of the foundation meets the design requirements; the foundation is leveled, rolled and compacted, and the flatness of the foundation is controlled within ±10mm; drainage or diversion measures are taken for areas with water accumulation to ensure that the foundation is dry and stable. S3: Subbase construction and installation positioning A bedding layer is laid and compacted on the treated base, with a thickness of 100-300mm. An installation reference line or component projection positioning point corresponding to the box culvert axis and cross-sectional contour is set on the surface of the bedding layer to define the planar installation position of the third precast component 3. Its planar positioning error is controlled within ±5mm. At the same time, a waterproof structure is pre-set at the position of the third joint 31 corresponding to the third precast component 3 to prevent groundwater from seeping along the joint during the operation of the box culvert and improve the water tightness of the overall structure. S4: Hoisting and positioning of the third precast component 3. Multiple third precast components 3 are hoisted onto the surface of the subbase, and then connected axially to form a base plate unit. The vertical elevation of the components is controlled in one go during the subbase construction, with the elevation deviation controlled within ±5mm. When the components are in contact with the subbase, the planar position and angular direction of the third precast components 3 are corrected by adjusting the hoisting posture and making slight in-plane movements along the surface of the subbase. The horizontal position deviation is controlled within ±5mm, and the angular deviation is controlled within ±0.5°, so as to meet the requirements for joint closure when assembling the second precast components 2. S5: Assembly of the second prefabricated component 2 Multiple second precast components 2 are hoisted to both sides of the third precast component 3, so that the multiple second precast components 2 are connected axially to form a side wall unit. Under the hoisting state, they are aligned so that the second lower joint 22 of the second precast component 2 and the third joint 31 of the third precast component 3 form a tongue and groove connection. The joint gap is controlled within the range of 5-15mm to meet the subsequent sealing or grouting requirements, thereby completing the assembly of the lower structure of the box culvert. S6: Assembly of the first prefabricated component 1 After the lower structure of the box culvert is assembled, temporary support measures are set up for the lower structure according to construction needs. Then, multiple first precast components 1 are hoisted above the second precast components 2. Multiple first precast components 1 are connected axially to form a top plate unit and aligned under hoisting conditions so that the first joint 11 of the first precast component 1 and the second upper joint 21 of the second precast component 2 form a socket connection. S7: Waterproofing and backfilling construction After all the box culvert segments were assembled, waterproofing was carried out on the side wall units and the top slab units. Then, backfilling was carried out in layers and compacted to complete the construction of the box culvert structure.

[0034] Example 2: The difference between this embodiment and Embodiment 1 is that, in a construction method for large-section prefabricated box culvert structures applicable to cold and arid regions, in steps S5 and S6, the third prefabricated component 3, the second prefabricated component 2, and the first prefabricated component 1 are assembled in a staggered manner in the axial direction, with the staggered joint distance not less than 1 / 3 of the segment length, in order to improve the overall integrity of the longitudinal structure.

[0035] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A prefabricated box culvert structure with large cross-section suitable for cold and arid regions, characterized in that, It includes a top plate unit, a bottom plate unit, and two symmetrically arranged side wall units; The top plate unit includes multiple first prefabricated components (1) connected axially in sequence. The first prefabricated component (1) has an overall U-shaped structure, and the bottom ends of both sides of the first prefabricated component (1) are provided with first joints (11). The base plate unit includes multiple third prefabricated components (3) connected axially in sequence, and the third prefabricated components (3) are provided with third joints (31) on both sides. The side wall unit includes multiple second prefabricated components (2) connected axially in sequence. The second prefabricated component (2) has an overall L-shaped structure. One end of the second prefabricated component (2) is provided with a second upper connector (21) that is adapted to the first connector (11), and the other end is provided with a second lower connector (22) that is adapted to the third connector (31).

2. The prefabricated box culvert structure with large cross-section suitable for cold and arid regions according to claim 1, characterized in that, The first connector (11) and the second upper connector (21) are connected by a socket.

3. The prefabricated box culvert structure with large cross-section suitable for cold and arid regions according to claim 1, characterized in that, The second lower connector (22) and the third connector (31) are connected by tongue and groove joint.

4. A prefabricated box culvert structure with large cross-section suitable for cold and arid regions according to claim 1, characterized in that, The first prefabricated components (1) that are axially adjacent are connected by an axial connection structure; the third prefabricated components (3) that are axially adjacent are connected by an axial connection structure; the second prefabricated components (2) that are axially adjacent are connected by an axial connection structure.

5. A prefabricated box culvert structure with large cross-section suitable for cold and arid regions according to claim 1, characterized in that, Water-stop strips (5) are provided on the second precast component (2) near the second upper connector (21) and near the second lower connector (22), and the first precast component (1) and the third component are respectively provided with strip grooves (4).

6. A construction method for large-section prefabricated box culvert structures suitable for cold and arid regions, characterized in that, The method of using any one of claims 1 to 5 to realize a large-section prefabricated box culvert structure suitable for cold and arid regions specifically includes the following steps: S1: Component division and prefabrication Based on the engineering design requirements and on-site survey data, the cross-sectional dimensions of the box culvert were determined, and the box culvert was divided into a top slab unit, a bottom slab unit, and two symmetrically arranged sidewall units. The segment length is determined, the top plate unit is divided into multiple first precast components (1), the bottom plate unit is divided into multiple third precast components (3), and the side wall unit is divided into multiple second precast components (2). The length of a single component is 2-4m. After the precast components are prefabricated in the factory, they are transported to the construction site. S2: Excavation and foundation treatment of the foundation pit Excavation of the foundation pit is carried out at the construction site, and the foundation is inspected and treated; soft soil layers, local weak areas or cavities are replaced or reinforced to ensure that the bearing capacity of the foundation meets the design requirements; the foundation is leveled, rolled and compacted, and the flatness of the foundation is controlled within ±10mm; drainage or diversion measures are taken for areas with water accumulation to ensure that the foundation is dry and stable. S3: Subbase construction and installation positioning The cushion material is laid in layers and compacted on the treated base. The thickness of the cushion layer is 100-300mm. The installation reference line or component projection positioning point corresponding to the box culvert axis and cross-sectional outline is set on the surface of the cushion layer to limit the plane installation position of the third precast component (3). Its plane positioning error is controlled within ±5mm. At the same time, a waterproof structure is pre-set at the position of the third joint (31) corresponding to the third precast component (3) to prevent groundwater from seeping along the joint during the operation of the box culvert and improve the water tightness of the overall structure. S4: Hoisting and position correction of the third precast component (3) Multiple third precast components (3) are hoisted onto the surface of the subbase, and the multiple third precast components (3) are connected axially to form a base plate unit. The vertical elevation is controlled by the subbase construction in one go, and the elevation deviation is controlled within ±5mm. When the component is in contact with the subbase, the planar position and rotation direction of the third precast component (3) are corrected by adjusting the hoisting posture and the in-plane micro-movement method along the surface of the subbase. The horizontal position deviation is controlled within ±5mm and the rotation deviation is controlled within ±0.5°, so as to meet the requirements of joint closure when assembling the second precast component (2) later. S5: Assembly of the second prefabricated component (2), Multiple second precast components (2) are hoisted to both sides of the third precast component (3) respectively, so that multiple second precast components (2) are connected axially to form a side wall unit, and are aligned under hoisting conditions, so that the second lower joint (22) of the second precast component (2) and the third joint (31) of the third precast component (3) form a tongue and groove connection, and the joint gap is controlled within the range of 5-15mm to meet the subsequent sealing or grouting requirements, thereby completing the assembly of the lower structure of the box culvert; S6: Assembly of the first prefabricated component (1), After the lower structure of the box culvert is assembled, temporary support measures are set up for the lower structure according to the construction needs; then multiple first precast components (1) are hoisted to the top of the second precast component (2), and multiple first precast components (1) are connected axially to form a top plate unit, and are aligned under hoisting conditions so that the first joint (11) of the first precast component (1) and the second upper joint (21) of the second precast component (2) form a socket connection; S7: Waterproofing and backfilling construction After all the box culvert segments were assembled, waterproofing was carried out on the side wall units and the top slab units. Then, backfilling was carried out in layers and compacted to complete the construction of the box culvert structure.

7. A construction method for large-section prefabricated box culvert structures applicable to cold and arid regions, as described in claim 6, is characterized in that... In steps S5 and S6, the third precast component (3), the second precast component (2), and the first precast component (1) are assembled in a staggered manner in the axial direction, with the staggered distance not less than 1 / 3 of the segment length, so as to improve the overall integrity of the longitudinal structure.

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