Assembled self-draining culvert and assembly method thereof

Abstract

The present invention discloses an assembled self-draining culvert and an assembly method thereof, comprising a plurality of culvert units, which are spliced ​​in sequence along the axial direction to form a complete culvert; each culvert unit comprises a plurality of assembly pieces and a bottom plate; the plurality of assembly pieces comprise a top piece and two side pieces, and the top piece is arranged between the two side pieces; top piece protrusions are respectively provided at both ends of the top piece, and side piece grooves are provided at the upper ends of the side pieces, and the top piece protrusions are fitted in the side piece grooves; a drainage channel is provided between the top piece protrusions and the side piece grooves, and the drainage channels between two adjacent culvert units are connected; the present invention arranges a top piece protrusion on the top piece, arranges a side piece groove at the upper ends of the side pieces, and during splicing, the top piece protrusion is fitted with the side piece grooves, the top piece protrusion does not completely fill the side piece grooves, and a drainage channel is provided between the spliced ​​longitudinal seams, and the water seepage at the spliced ​​longitudinal seams is collected and discharged through the drainage channel, thereby preventing the water seepage from entering the interior of the culvert through the spliced ​​longitudinal seams of the culvert units.

Description

Technical Field

[0001] The present invention belongs to the technical field of culvert design, manufacturing and construction, and particularly relates to an assembled self-draining culvert and an assembly method thereof. Background Art

[0002] At present, three-piece prefabricated pipe culverts are widely used in my country's highway construction due to their prefabricated components, simple construction, and short construction period. However, due to the limitations of their structural form and construction method, traditional three-piece prefabricated pipe culverts have some shortcomings that cannot be ignored, such as: 1. All transverse joints are located on the same cross-section, and the joints are the weak points of the structure. When the pipe culvert is subjected to large unbalanced forces in the transverse direction, the joints are prone to large deformation or even damage; 2. The waterproofing of the pipe culvert joints only relies on laying waterproof materials outside the joints, and the waterproof materials are mostly organic substances such as waterproof membranes, and their effective period is generally only about 10 years. After 10 years, the pipe culvert will be very likely to leak; 3. The connection between the assembled steel bars relies on on-site welding. The welding operation is labor-intensive and difficult, which slows down the construction progress and increases construction costs; 4. The assembled pipe culvert has a loose structure, lacks overall connection, and has poor overall stress performance. Summary of the Invention

[0003] In view of the above-mentioned deficiencies in the prior art, the present invention provides an assembled self-draining culvert and an assembly method thereof to solve the technical problem that water leakage is prone to occur at the joints of the culvert in the prior art.

[0004] To achieve the above object, the technical solution of the present invention is:

[0005] The present invention provides an assembled self-draining culvert, comprising a plurality of culvert units, which are spliced ​​in sequence along the axial direction to form a complete culvert; each culvert unit comprises a plurality of assembly pieces and a bottom plate, the plurality of assembly pieces are spliced ​​circumferentially to form a transverse assembly ring, and the bottom plate and the transverse assembly ring are spliced ​​circumferentially to form a circumferentially closed culvert unit; the plurality of assembly pieces comprise a top piece and two side pieces, the top piece is arranged between the two side pieces, one end of the top piece is matched and connected with the upper end of one of the side pieces, the other end of the top piece is matched and connected with the upper end of the other side piece, and the two ends of the bottom plate are respectively matched and connected with the lower ends of the two side pieces; the two ends of the top piece are respectively provided with a top piece protrusion, the upper end of the side piece is provided with a side piece groove, the top piece protrusion is matched and installed in the side piece groove; a drainage channel is provided between the top piece protrusion and the side piece groove, and the drainage channels between two adjacent culvert units are connected.

[0006] Furthermore, the lengths of two adjacent assembly pieces in the same culvert unit are different; when two adjacent culvert units are spliced ​​together, the splicing transverse seams of the two adjacent assembly pieces are staggered.

[0007] Furthermore, the assembly piece includes an assembly piece body, assembly piece longitudinal steel bars, assembly piece transverse steel bars, reserved connecting steel bars and embedded sleeves; the assembly piece body is covered on the outside of the assembly piece longitudinal steel bars and the assembly piece transverse steel bars, and the assembly piece longitudinal steel bars and the assembly piece transverse steel bars are arranged crisscross; the reserved connecting steel bars are provided at one end of the assembly piece body, and the embedded sleeve is buried at the other end of the body during assembly; one end of the reserved connecting steel bars is fixedly connected to the assembly piece longitudinal steel bars, and the other end of the reserved connecting steel bars extends to the outside of the assembly piece body; the reserved connecting steel bars of the assembly piece in one culvert unit are passed through the embedded sleeve of the corresponding assembly piece in the previous culvert unit, and the embedded sleeve is filled with cement slurry.

[0008] Furthermore, a grouting hole is provided on the upper part of the assembly piece body, the lower end of the grouting hole is connected to the embedded casing, and the upper end of the grouting hole is connected to the outside world. The grouting hole is used to set a grouting pipe, through which cement slurry can be poured into the embedded casing.

[0009] Furthermore, it also includes a prestressed anchor cable, one end of the prestressed anchor cable is fixedly connected to the front end culvert unit, and the other end of the prestressed anchor cable is fixedly connected to the rear end culvert unit; a reserved anchor cable hole is set through the assembly plate body; the reserved anchor cable holes on the corresponding assembly plates in the two adjacent culvert units are set through; the prestressed anchor cable is set through the reserved anchor cable hole.

[0010] Furthermore, it also includes prefabricated steel arch frames, which are arranged at intervals along the axial direction of the culvert, the prefabricated steel arch frames are sleeved on the inner side of the culvert unit, and the prefabricated steel arch frames are fixedly connected to the culvert unit.

[0011] Furthermore, the prefabricated steel arch frame includes two semicircular arch frames, an arch frame connecting plate and an arch frame connecting bolts. The two semicircular arch frames are symmetrically arranged on the inner side of the culvert unit; arch frame connecting plates are respectively provided at both ends of the two semicircular arch frames, and the upper arch frame connecting plates of the two semicircular arch frames are fixedly connected by bolts; assembly plate connecting bolt holes are provided on the semicircular arch frame, and corresponding installation bolt holes are provided on the assembly plate. The connecting bolts pass through the assembly plate connecting bolt holes and the installation bolt holes in turn to fix the assembly plate and the semicircular arch frame together.

[0012] Furthermore, a connecting boss is provided at the lower end of the side piece, and connecting grooves are provided at both ends of the bottom plate. The connecting boss at the lower end of the side piece is cooperatively connected with the connecting groove of the bottom plate.

[0013] Furthermore, the bottom plate includes bottom plate concrete, bottom plate longitudinal steel bars, and bottom plate transverse steel bars. The bottom plate concrete is covered on the outside of the bottom plate longitudinal steel bars and the bottom plate transverse steel bars, and the bottom plate longitudinal steel bars and the bottom plate transverse steel bars are arranged crisscross; the lower ends of the assembly plate transverse steel bars in the two side plates extend into the bottom plate concrete; the bottom plate transverse steel bars and the assembly plate transverse steel bars are fixedly connected together through steel bar connecting sleeves; the bottom plate concrete adopts cast-in-place concrete.

[0014] The present invention also provides an assembly method for an assembled self-draining culvert, comprising the following steps:

[0015] Step 1: hoist the two side panels of the first culvert unit, then hoist the top panel of the first culvert unit, and completely fit the top panel protrusion of the top panel into the side panel groove of the side panel;

[0016] Step 2: After completing the assembly of the first pipe culvert unit, start hoisting the two side pieces of the second pipe culvert unit, and then hoist the top piece of the second pipe culvert unit. During assembly, the drainage channel at the splicing longitudinal seam is unobstructed;

[0017] Step 3: Repeat step 2 to complete the hoisting of each culvert unit in the middle;

[0018] Step 4: After all pipe culvert units are hoisted, proceed with base plate construction.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention provides an assembled self-draining culvert, which is achieved by arranging a top sheet protrusion on the top sheet and a side sheet groove on the upper end of the side sheet. When splicing, the top sheet protrusion is matched and connected with the side sheet groove. The top sheet protrusion does not completely fill the side sheet groove. A drainage channel is arranged in between. The drainage channel can collect seepage water along the spliced ​​longitudinal seams of the culvert units, and the seepage water is collected and discharged through the drainage channel, thereby preventing the seepage water from entering the interior of the culvert through the spliced ​​longitudinal seams of the culvert units when the outer waterproof layer of the culvert fails due to a long service life or other reasons, thereby ensuring that no seepage occurs inside the culvert.

[0021] Furthermore, the assembly pieces of two adjacent culvert units are set to different lengths, and the joints are located on different sections when the assembly pieces are spliced, thereby avoiding large displacement or damage at the joints when the culvert is subjected to large deviatoric stress.

[0022] Furthermore, by setting reserved connecting steel bars at one end of the assembly piece and pre-buried sleeves at the other end; during splicing construction, the reserved connecting steel bars of the current culvert unit are inserted and connected with the pre-buried sleeves of the previous culvert unit, and cement slurry is poured into the pre-buried sleeves for fixing, thereby ensuring the firm connection of the assembly pieces in the two adjacent culvert units, improving the integrity and stability of the culvert structure, reducing on-site welding processes, saving construction time, and accelerating construction progress.

[0023] Furthermore, by providing grouting holes on the assembly piece body, it is convenient to perform cement grouting construction into the embedded casing.

[0024] Furthermore, by using prestressed anchor cables to connect the various assembly pieces in the culvert structure in series, the integrity of the culvert structure is ensured; the various assembly pieces in the same axial direction are tightly connected, reducing water seepage at the transverse joints between the assembly pieces.

[0025] Furthermore, by setting up prefabricated steel arch frames to support and constrain the interval circumferential arch rings, the circumferential integrity and stability of the culvert structure are ensured, ensuring that the culvert will not experience large displacement when subjected to large deviatoric stress, thereby improving the bearing capacity of the culvert.

[0026] Furthermore, the side panels and the bottom plate are connected by connecting bosses and connecting grooves, which improves the stability of the structure and reduces water seepage at the joints between the side panels 112 and the bottom plate 12.

[0027] Furthermore, by fixedly connecting the transverse reinforcement of the bottom plate and the transverse reinforcement of the assembly plate, the integrity between the assembly plate and the bottom plate is improved, thereby enhancing the stability of the structure.

[0028] The present invention also provides an assembly method for an assembled self-draining culvert, which has a simple assembly process and low requirements for lifting equipment; the assembly process does not require on-site welding, which saves construction time and speeds up the construction progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall structure of an assembled self-drainage culvert according to the present invention;

[0030] Figure 2 This is a schematic cross-sectional view of an assembled self-drainage culvert according to the present invention;

[0031] Figure 3 This is an axial schematic diagram of a top plate in an assembled self-drainage culvert according to the present invention;

[0032] Figure 4 This is a schematic longitudinal cross-sectional view of a top plate in an assembled self-drainage culvert according to the present invention;

[0033] Figure 5 This is an axial schematic diagram of a side piece in an assembled self-drainage culvert according to the present invention;

[0034] Figure 6 This is a schematic longitudinal cross-sectional view of a side piece in an assembled self-drainage culvert according to the present invention;

[0035] Figure 7This is a schematic transverse cross-sectional view of a bottom plate in an assembled self-drainage culvert according to the present invention;

[0036] Figure 8 This is a schematic longitudinal cross-sectional view of a bottom plate in an assembled self-drainage culvert according to the present invention;

[0037] Figure 9 This is a schematic diagram of the prestressed anchor cable structure in an assembled self-drainage culvert according to the present invention;

[0038] Figure 10 This is a schematic diagram of a prefabricated steel arch structure in an assembled self-drainage culvert according to the present invention;

[0039] Figure 11 This is a schematic cross-sectional view of a prefabricated steel arch frame in an assembled self-drainage culvert according to the present invention;

[0040] Figure 12 This is a schematic diagram of the high-strength straight bolt structure in an assembled self-drainage culvert according to the present invention;

[0041] Figure 13 This is a schematic diagram of the high-strength bent bolt structure in an assembled self-drainage culvert described in the present invention.

[0042] Among them, 1 culvert unit, 2 prestressed anchor cable, 3 prefabricated steel arch frame, 4 connecting bolts; 11 assembly plate, 12 bottom plate; 111 top plate, 112 side plate, 113 top plate protrusion, 114 side plate groove, 115 connecting boss; 120 connecting boss; 101 assembly plate body, 102 assembly plate longitudinal steel bar, 103 assembly plate transverse steel bar, 104 reserved connecting steel bar, 105 embedded casing, 106 grouting hole, 107 reserved anchor cable hole, 108 steel mesh; 121 bottom plate concrete, 122 bottom plate longitudinal steel bar, 123 bottom plate transverse steel bar, 124 steel bar connecting sleeve; 21 guide head, 22 steel strand, 23 pad, 24 anchor plate, 25 protective cover, 26 hoop; 31 semicircular arch frame, 32 arch frame connecting plate, 33 arch frame connecting bolts; 311 wing plate, 312 web plate. DETAILED DESCRIPTION

[0043] In order to better explain the technical solutions of the present invention, the specific implementation methods of the present invention will be described in detail below with reference to the accompanying drawings. The described embodiments are only a part of the embodiments of the present invention and cannot be regarded as all representatives of the embodiments of the present invention.

[0044] As attached Figure 1-13As shown, the present invention provides an assembled self-draining culvert, comprising a plurality of culvert units 1, prestressed anchor cables 2, prefabricated steel arch frames 3 and connecting bolts 4. The plurality of culvert units 1 are spliced ​​in sequence along the axial direction to form a complete culvert; the prestressed anchor cables 2 pass through all the culvert units 1 in sequence, connecting all the culvert units 1 in series into a whole; one end of the prestressed anchor cables 2 is fixedly connected to the front end culvert unit, and the other end of the prestressed anchor cables 2 is fixedly connected to the rear end culvert unit; the prefabricated steel arch frames 3 are arranged at intervals along the axial direction of the culvert, the prefabricated steel arch frames 3 are sleeved on the inner side of the culvert units 1, and the prefabricated steel arch frames 3 and the culvert units 1 are fixedly connected by connecting bolts 4. The external structure of the prefabricated steel arch frames 3 is adapted to the cross-sectional structure of the culvert.

[0045] Each culvert unit 1 includes a plurality of assembly pieces 11 and a bottom plate 12. The plurality of assembly pieces 11 are spliced ​​in an annular direction to form a transverse assembly ring, and the bottom plate 12 and the transverse assembly ring are spliced ​​in an annular direction to form an annularly closed culvert unit; the plurality of assembly pieces 11 include a top piece 111 and two side pieces 112, the top piece 111 is arranged between the two side pieces 112, one end of the top piece 111 is matched and connected with the upper end of one of the side pieces 112, and the other end of the top piece 111 is matched and connected with the upper end of the other side piece 12; the two ends of the lower side of the bottom plate 2 are respectively matched and connected with the lower ends of the two side pieces; both ends of the top piece 111 are provided with a top piece protrusion 113, and the top piece protrusion 113 is arranged along the axis direction of the culvert; the upper end of the side piece 112 is provided with a side piece groove 114, and the side piece groove 114 is arranged along the axis direction of the culvert; the top of one end of the top piece 111 is connected to the upper end of the other side piece 12; The sheet protrusion 113 is fitted into the side sheet groove 114 at the upper end of one side sheet 112, and the top sheet protrusion 113 at the other end of the top sheet 111 is fitted into the side sheet groove 114 at the upper end of the other side sheet 112; a drainage channel 5 is provided between the top sheet protrusion 113 and the side sheet groove 114, and the drainage channels between two adjacent culvert units 1 are connected; the drainage channel in the entire culvert is provided with a drainage slope of 1%-2%; by providing a drainage channel at the splicing longitudinal seam between the assembly sheets 11, the drainage channel can collect seepage water along the splicing longitudinal seam of the culvert unit, and collect and discharge the seepage water through the drainage channel, thereby avoiding the seepage water from entering the interior of the culvert through the splicing longitudinal seam of the culvert unit when the outer waterproof layer of the culvert fails due to a long service life or other reasons, thereby ensuring that no seepage occurs inside the culvert.

[0046] A connecting boss 115 is provided at the lower end of the side panel 112, and a connecting groove 120 is provided at both ends of the bottom plate 12. The connecting boss 115 at the lower end of the side panel 112 is cooperated and connected with the connecting groove 120 of the bottom plate 12, thereby realizing an effective connection between the side panel 112 and the bottom plate 12, improving the stability of the structure, and reducing water seepage at the joint between the side panel 112 and the bottom plate 12.

[0047] In the same culvert unit 1, the lengths of two adjacent assembly pieces 11 are different; when two adjacent culvert units 1 are spliced, the splicing transverse seams of the corresponding assembly pieces 11 are staggered; when two adjacent culvert units 1 are spliced, their splicing transverse seams are located on different sections, thereby avoiding large displacement or damage at the splicing transverse seams when the culvert is subjected to large deviatoric stress.

[0048] The assembly piece 11 includes an assembly piece body 101, an assembly piece longitudinal steel bar 102, an assembly piece transverse steel bar 103, a reserved connecting steel bar 104, a pre-buried sleeve 105, a grouting hole 106, a reserved anchor hole 107 and a steel mesh 108;

[0049] The longitudinal steel bars 102 of the assembly piece are arranged along the axis direction of the culvert, and the transverse steel bars 103 of the assembly piece are arranged perpendicular to the axis direction of the culvert, and the longitudinal steel bars 102 and the transverse steel bars 103 of the assembly piece are arranged in a crisscross manner; the assembly piece body 101 is covered on the outside of the longitudinal steel bars 102 and the transverse steel bars 103 of the assembly piece; the reserved connecting steel bars 104 are arranged at one end of the assembly piece body 101, and the embedded sleeve 105 is embedded in the other end of the body 101 during assembly; one end of the reserved connecting steel bar 104 is fixedly connected to the longitudinal steel bar 102 of the assembly piece, and the other end of the reserved connecting steel bar 104 extends to the outside of the assembly piece body 101; the reserved connecting steel bar 104 of the assembly piece 1 in one of the culvert units 1 is passed through the embedded sleeve 105 of the corresponding assembly piece 11 in the previous culvert unit 1, and the embedded sleeve 105 is filled with cement slurry; preferably, the reserved connecting steel bar 104 is formed by extending the longitudinal steel bar of the assembly piece outward by 20 cm and inserting it into the corresponding embedded sleeve.

[0050] A grouting hole 106 is provided on the upper part of the assembly piece body 101. The lower end of the grouting hole 106 is connected to the embedded sleeve 105, and the upper end of the grouting hole 106 is connected to the outside world. The grouting hole 106 is used to set a grouting pipe. Cement slurry can be poured into the embedded sleeve 105 through the grouting pipe to ensure the fixed connection between the reserved connecting steel bar 104 and the embedded sleeve 105, thereby realizing the axial connection of the assembly piece 11 and the splicing positioning of the culvert unit 1.

[0051] The reserved anchor cable holes 107 are set through the assembly piece body 101, and the reserved anchor cable holes 107 on the corresponding assembly pieces 1 in two adjacent culvert units 1 are set through; the prestressed anchor cable 2 is set through the reserved anchor cable holes 107; through the prestressed anchor cable 2, several assembly pieces on the same axial direction in the culvert are connected in series, so that the various assembly pieces are tightly connected, reducing the possibility of water seepage at the transverse joints of the assembly pieces and improving the integrity of the culvert structure.

[0052] The steel mesh 108 is arranged in the assembly plate body 101. By arranging the steel mesh 108, the structural strength of the assembly plate 11 is improved, and the stability of the culvert is effectively enhanced.

[0053] The bottom plate 12 includes bottom plate concrete 121, bottom plate longitudinal steel bars 122, and bottom plate transverse steel bars 123. The bottom plate longitudinal steel bars 122 are arranged along the axis of the culvert, and the bottom plate transverse steel bars 123 are arranged perpendicular to the axis of the culvert. The bottom plate longitudinal steel bars 122 and the bottom plate transverse steel bars 123 are arranged in a crisscross manner; the bottom plate concrete 121 is covered on the outside of the bottom plate longitudinal steel bars 122 and the bottom plate transverse steel bars 123; the lower ends of the assembly plate transverse steel bars 103 in the two side plates extend into the bottom plate concrete 121; the bottom plate transverse steel bars 123 and the assembly plate transverse steel bars 103 are fixedly connected together by the steel bar connecting sleeves 124; by fixing the bottom plate transverse steel bars 123 and the assembly plate transverse steel bars 103 together, the integrity between the assembly plate and the bottom plate is improved, and the stability of the structure is enhanced; the bottom plate concrete 121 adopts cast-in-place concrete.

[0054] The prestressed anchor cable 2 includes a guide head 21, a steel strand 22, a pad 23, an anchor plate 24, a protective cover 25 and a hoop 26. The guide head 21 is arranged at one end of the steel strand 22. The guide head 21 is fixedly arranged on the assembly plate 1 of the front end culvert unit 1. The steel strand 22 passes through the corresponding reserved anchor cable holes 107 in sequence. The pad 23 is arranged at the other end of the steel strand 22 and is tightly arranged on the assembly plate body 101 of the rear end culvert unit 1. The anchor plate 24 is arranged at the rear end of the pad 23. The protective cover 25 is arranged on the outside of the anchor plate 24; the hoop 26 is arranged at intervals on the steel strand 22 to support the steel strand 23; after the prestressed anchor cable 2 is tensioned, cement slurry is poured into the reserved anchor cable hole 107 for filling; the steel strand 23 adopts multiple strands of steel strands, and the multiple strands of steel strands are tied into one strand through the hoop; the guide head adopts a detachable guide head, and a grouting hole is set on the anchor plate. After the steel strand is tensioned, cement slurry is poured into the reserved anchor cable hole through the grouting hole to fill and fix it.

[0055] The prefabricated steel arch frame 3 includes two semicircular arch frames 31, an arch frame connecting plate 32 and an arch frame connecting bolt 33. The two semicircular arch frames 31 are symmetrically arranged on the inner side of the culvert unit 1. Arch frame connecting plates 32 are respectively provided at both ends of the two semicircular arch frames 31. Arch frame connecting bolt holes are provided on the arch frame connecting plates 32. Arch frame connecting bolts 33 are passed through the arch frame connecting bolt holes to fix the two semicircular arch frames 31 together; wherein, the arch frame connecting plates on the two semicircular arch frames 31 are connected by high-strength straight bolts; assembly plate connecting bolt holes are provided on the semicircular arch frame 31, and corresponding mounting bolt holes are provided on the assembly plate 11. The connecting bolts 4 pass through the assembly plate connecting bolt holes and the mounting bolt holes in sequence to fix the assembly plate 11 and the semicircular arch frame 31 together; the connecting bolts 4 are high-strength bent bolts, and a gasket is provided between the high-strength bent bolts and the assembly plate.

[0056] The semicircular arch frame 31 includes a wing plate 311 and a web plate 312; the wing plate 311 is arranged parallel to the axis of the culvert, and the web plate 312 is vertically welded to the inner side of the wing plate 311. Web openings are evenly arranged on the web plate 312, which reduces the weight of the arch frame structure itself and facilitates movement during construction; the assembly piece connection bolt holes are arranged on the wing plate 311, and the assembly piece connection bolts pass through the assembly piece connection bolt holes and the installation bolt holes in sequence to fix the assembly piece to the semicircular arch frame 31.

[0057] The assembly method of the assembled self-draining culvert described in the present invention comprises the following steps:

[0058] Step 1: Hoist the two semicircular arch frames into place according to the designed positions; connect the two semicircular arch frames into a whole through the arch frame connecting bolts to complete the assembly of the prefabricated steel arch frame;

[0059] Step 2: Using the prefabricated steel arch as a positioning basis, hoist the two side pieces of the first pipe culvert unit, and then hoist the top piece of the first pipe culvert unit; during hoisting, the top piece protrusion of the top piece should be completely stuck in the side piece groove of the side piece, and at the same time, ensure that the mounting bolt holes on the assembly piece correspond to the assembly piece connection bolt holes on the prefabricated steel arch, so that the assembly piece and the prefabricated steel arch can be fixedly connected using the assembly piece connection bolts;

[0060] Step 3: When the first pipe culvert unit is assembled, start hoisting the two side pieces of the second pipe culvert unit, and then hoist the top piece of the second pipe culvert unit; when hoisting the second pipe culvert unit, the circumferential transverse seams of the assembly pieces are staggered; during hoisting, ensure that the reserved connecting steel bars of the second pipe culvert unit are aligned and inserted into the embedded casing of the first pipe culvert unit, and ensure that the grouting holes are not blocked; the drainage channels at the spliced ​​longitudinal seams are unobstructed, and the reserved anchor holes between the corresponding assembly pieces are connected;

[0061] Step 4: Repeat step 3 above to complete the hoisting of each culvert unit in the middle;

[0062] Step 5: After the last culvert unit is hoisted, the prestressed anchor cable construction begins. After the prestressed anchor cable is tensioned, cement slurry is poured into the reserved anchor cable hole. Then, cement slurry is poured into the embedded casing through the grouting pipe. After completion, the grouting hole is sealed.

[0063] Step 6: Adjust the prefabricated steel arch frame so that the mounting bolt holes on the assembly piece correspond to the assembly piece connection bolt holes on the prefabricated steel arch frame; use the assembly piece connection bolts to securely connect the assembly piece to the prefabricated steel arch frame;

[0064] Step 7: waterproofing the joints using a waterproofing method. Preferably, polyurethane waterproof coating and modified asphalt waterproof membrane are used to waterproof the joints.

[0065] Step 8: Use the steel bar connecting sleeve to connect the transverse steel bars of the assembly piece at the lower end of the side piece with the transverse steel bars of the bottom plate, erect the formwork, and pour the bottom plate concrete.

[0066] The present invention provides an assembled self-draining culvert, comprising a plurality of culvert units, each of which comprises two types of assembly sheets, namely, a top sheet and a side sheet. In the same culvert unit, the lengths of each assembly sheet are different to ensure that when two adjacent culvert units are spliced, the splicing transverse seams are not in the same vertical plane, thereby ensuring that when the culvert is subjected to large deviatoric stress, large displacement or damage will not occur along the splicing transverse seams. By providing top sheet protrusions at both ends of the top sheet and side sheet grooves at the upper ends of the side sheets, when the top sheet and the side sheets are spliced, the top sheet protrusions cooperate with the side sheet grooves. When spliced, the top sheet protrusions fit neatly into the side sheet grooves while not completely blocking the side sheet grooves, forming a cavity of a certain cross-sectional area between the top sheet protrusions and the side sheet grooves to serve as a drainage channel. The drainage channels of two adjacent culvert units are provided with a drainage slope of 1% to 2% along the designed drainage direction. By providing a self-draining channel at the splicing longitudinal seam, the drainage channel can collect water seeping from the splicing longitudinal seam, thereby preventing water seepage from entering the culvert through the splicing longitudinal seam.

[0067] In the present invention, the assembly pieces in the same axial direction of the culvert are connected in series by prestressed anchor cables, thereby ensuring the integrity of the culvert structure, making the assembly pieces tightly connected, and reducing the possibility of water seepage at the splicing transverse seams.

[0068] In the present invention, prefabricated steel arch rings are arranged at intervals to achieve circumferential support and constraint on the culvert unit, thereby ensuring the circumferential integrity and stability of the culvert, ensuring that the culvert unit will not experience large displacement when subjected to large deviatoric stress, and fully exerting the bearing capacity of the culvert.

[0069] In the present invention, the corresponding assembly pieces in two adjacent culvert units are connected using casing grouting technology, ensuring the axially secure splicing of the assembly pieces and the integrity of the culvert. This also reduces on-site welding processes, shortens construction time, and accelerates construction progress. The assembly pieces in the present invention can all be prefabricated in the factory. On-site connection is achieved using high-strength bolts and casing grouting, eliminating the need for on-site welding and significantly accelerating construction progress.

[0070] Prestressed anchor cables, prefabricated steel arch frames and connecting bolts, several culvert units are spliced ​​in sequence along the axial direction to form a complete culvert; the prestressed anchor cables pass through all the culvert units in sequence, connecting all the culvert units into a whole; one end of the prestressed anchor cable is fixedly connected to the frontmost culvert unit, and the other end of the prestressed anchor cable is fixedly connected to the rearmost culvert unit; the prefabricated steel arch frames are arranged at intervals along the axis of the culvert, and the prefabricated steel arch frames and the culvert units are fixedly connected by connecting bolts, and the external structure of the prefabricated steel arch frames is adapted to the cross-sectional structure of the culvert.

[0071] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. An assembled self-draining culvert, characterized in that: The invention comprises a plurality of pipe culvert units (1), wherein the plurality of pipe culvert units (1) are sequentially spliced ​​in the axial direction to form a complete pipe culvert; each pipe culvert unit (1) comprises a plurality of assembly pieces (11) and a bottom plate (12); the plurality of assembly pieces (11) are spliced ​​in an annular direction to form a transverse assembly ring; the bottom plate (2) and the transverse assembly ring are spliced ​​in an annular direction to form an annularly closed pipe culvert unit; the plurality of assembly pieces (11) comprise a top piece (111) and two side pieces (112); the top piece (111) is arranged between the two side pieces (112); one end of the top piece (111) is matched and connected with the upper end of one of the side pieces (112); the other end of the top piece (111) is matched and connected with the upper end of the other side piece (112); the bottom plate (12) is connected to the top of the other side piece (112); The two ends of the top sheet (111) are respectively connected with the lower ends of the two side sheets (12); the two ends of the top sheet (111) are respectively provided with a top sheet protrusion (113), and the upper end of the side sheet (112) is provided with a side sheet groove (114), and the top sheet protrusion (113) is installed in the side sheet groove (114); a drainage channel is provided between the top sheet protrusion (113) and the side sheet groove (114), and the drainage channels between two adjacent culvert units are connected; wherein, the top sheet protrusion (113) and the side sheet groove (114) are connected in a coordinated manner, and when spliced, the top sheet protrusion (113) is embedded in the side sheet groove (114), and a cavity is formed between the top sheet protrusion (113) and the side sheet groove (114) to serve as a drainage channel; The assembly piece (11) comprises an assembly piece body (101), an assembly piece longitudinal steel bar (102), an assembly piece transverse steel bar (103), a reserved connecting steel bar (104) and a pre-buried sleeve (105); the assembly piece body (101) is covered on the outside of the assembly piece longitudinal steel bar (102) and the assembly piece transverse steel bar (103), and the assembly piece longitudinal steel bar (102) and the assembly piece transverse steel bar (103) are arranged in a crisscross manner; the reserved connecting steel bar (104) is set at one end of the assembly piece body (101), and the pre-buried sleeve (105) is provided at the bottom of the assembly piece body (101). The embedded sleeve (105) is embedded at the other end of the main body (101) during assembly; one end of the reserved connecting steel bar (104) is fixedly connected to the longitudinal steel bar (102) of the assembly piece, and the other end of the reserved connecting steel bar (104) extends to the outside of the assembly piece main body (101); the reserved connecting steel bar (104) of the assembly piece (1) in one culvert unit (1) is passed through the embedded sleeve (105) of the corresponding assembly piece (11) in the previous culvert unit (1), and the embedded sleeve (105) is filled with cement slurry; A grouting hole (106) is provided on the upper portion of the assembly piece body (101), the lower end of the grouting hole (106) is communicated with the embedded casing (105), and the upper end of the grouting hole (106) is communicated with the outside world. The grouting hole (106) is used to set a grouting pipe, through which cement slurry can be poured into the embedded casing (105); The assembly method of the assembled self-drainage culvert includes the following steps: Step 1: hoist the two side panels of the first culvert unit, then hoist the top panel of the first culvert unit, and completely fit the top panel protrusion of the top panel into the side panel groove of the side panel; Step 2: After completing the assembly of the first pipe culvert unit, start hoisting the two side pieces of the second pipe culvert unit, and then hoist the top piece of the second pipe culvert unit. During assembly, the drainage channel at the splicing longitudinal seam is unobstructed; Step 3: Repeat step 2 to complete the hoisting of each culvert unit in the middle; Step 4: After all pipe culvert units are hoisted, proceed with base plate construction.

2. The assembled self-draining culvert according to claim 1, characterized in that: The lengths of two adjacent assembly pieces (1) in the same pipe culvert unit (1) are different; when the two adjacent pipe culvert units (1) are spliced, the splicing transverse seams of the two adjacent assembly pieces (1) are staggered.

3. The assembled self-draining culvert according to claim 1, characterized in that: The invention also includes a prestressed anchor cable (2), one end of which is fixedly connected to the frontmost culvert unit, and the other end of which is fixedly connected to the rearmost culvert unit; a reserved anchor cable hole is provided through the assembly piece body (101); the reserved anchor cable holes (107) on the corresponding assembly pieces (1) in two adjacent culvert units (1) are provided through-through; and the prestressed anchor cable (2) is provided through the reserved anchor cable hole (107).

4. The assembled self-draining culvert according to claim 1, characterized in that: It also includes prefabricated steel arch frames (3), which are arranged at intervals along the axial direction of the pipe culvert, and the prefabricated steel arch frames (3) are sleeved on the inner side of the pipe culvert unit (1), and the prefabricated steel arch frames (3) are fixedly connected to the pipe culvert unit (1).

5. The assembled self-draining culvert according to claim 4, characterized in that: The prefabricated steel arch frame (3) comprises two semicircular arch frames (31), an arch frame connecting plate (32) and an arch frame connecting bolt (33), wherein the two semicircular arch frames (31) are symmetrically arranged on the inner side of the culvert unit (1); arch frame connecting plates (32) are respectively arranged at both ends of the two semicircular arch frames (31), and the upper arch frame connecting plates (32) of the two semicircular arch frames (31) are fixedly connected by bolts; an assembly plate connecting bolt hole is arranged on the semicircular arch frame (31), and a corresponding mounting bolt hole is arranged on the assembly plate (11), and the connecting bolt (4) passes through the assembly plate connecting bolt hole and the mounting bolt hole in sequence to fix the assembly plate (11) and the semicircular arch frame (31) together.

6. The assembled self-draining culvert according to claim 1, characterized in that: The lower end of the side piece (112) is provided with a connecting boss (115), and both ends of the bottom plate (12) are respectively provided with connecting grooves (120). The connecting boss (115) at the lower end of the side piece (112) is matched and connected with the connecting groove (120) of the bottom plate (12).

7. The assembled self-draining culvert according to claim 1, characterized in that: The bottom plate (12) comprises bottom plate concrete (121), bottom plate longitudinal steel bars (122), and bottom plate transverse steel bars (123). The bottom plate concrete (121) is coated on the outer sides of the bottom plate longitudinal steel bars (122) and the bottom plate transverse steel bars (123). The bottom plate longitudinal steel bars (122) and the bottom plate transverse steel bars (123) are arranged in a crisscross pattern. The lower ends of the assembly plate transverse steel bars (103) in the two side plates extend into the bottom plate concrete (121). The bottom plate transverse steel bars (123) and the assembly plate transverse steel bars (103) are fixedly connected together through a steel bar connecting sleeve. The bottom plate concrete (121) adopts cast-in-place concrete.

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