Spliced hydrophobic culvert and construction method thereof

Abstract

This invention provides a spliced ​​drainage culvert and its construction method. The culvert includes frame-shaped components connected in sequence. Each frame-shaped component includes a top plate and side plates disposed on both sides of the top plate. The bottom of the two side plates is connected by a base plate. The top plate has a U-shaped structure with a convex arc-shaped cross-section at the top. The top of the top plate has an arc-shaped depression along its length, and the bottom of the top plate has convex arc structures at both ends. The side plates have concave arc structures at the top, and the convex arc structures are connected to the concave arc structures. The bottom of the side plates has supporting protrusions, and drainage mechanisms are evenly distributed along the length of the side plates at the connection between the supporting protrusions and the side plates. The automatic drainage function of the frame-shaped components is achieved through the convex arc and concave arc top plates combined with the drainage mechanisms. This solves the technical problem of poor hydrophobicity on the outside of existing spliced ​​culverts and avoids the problem of sealing and waterproofing failure due to water accumulation at the joints.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underground foundation construction, and in particular to a spliced drainage culvert and a construction method thereof. BACKGROUND

[0002] As an advanced underground civil engineering technology, the spliced (or assembled) culvert has been widely used in modern infrastructure construction. Compared with the traditional cast-in-place underground culvert, the spliced culvert has the advantages of short construction period, controllable quality, and small environmental disturbance, etc. by adopting the construction mode of factory prefabrication and on-site assembly. Common structural forms include prefabricated box culverts and pipe segments, and the basic construction process includes steps such as foundation pit excavation, foundation treatment, prefabricated segment hoisting, segment splicing, and backfilling of abutment.

[0003] During the segment splicing process, the treatment of the settlement joint / joint is the key to ensuring the integrity and durability of the structure. In the prior art, sealing elements such as rubber waterstop, water-swelling waterstop strip, etc. are usually arranged at the segment joint, and cement mortar or polysulfide sealant is used for caulking treatment to achieve waterproof sealing of the joint.

[0004] The existing waterproof sealing method can basically ensure the waterproofness of the culvert. However, because the culvert is relatively long, when water contacts the surface of the culvert, especially the upper surface, especially the joint of the upper surface, water is very easy to accumulate, especially when the culvert has a slight settlement. Water is very easy to accumulate at the joint, and the long-term presence of water at the joint is easy to corrode and penetrate the sealing element, resulting in failure of the sealing and waterproofing. SUMMARY

[0005] In view of the deficiencies in the prior art, the present application provides a spliced drainage culvert and a construction method thereof, which solves the technical problem of poor drainage of the existing spliced culvert outside.

[0006] According to the spliced drainage culvert according to the embodiment of the present application, the frame member includes a top plate and side plates arranged on both sides of the top plate, and the bottom of the two side plates is provided with a bottom plate connection.

[0007] The top plate is a concave structure, the top of the top plate is a convex circular arc structure, the top of the top plate is provided with a circular arc recess along the length direction, and the two ends of the bottom of the top plate are provided with convex circular arc structures.

[0008] The top of the side plate is provided with a concave circular arc structure, the convex circular arc structure is connected with the concave circular arc structure, the bottom of the side plate is provided with a support protrusion, and the support protrusion is uniformly distributed with a drainage mechanism along the length direction of the side plate at the connection position of the support protrusion and the side plate.

[0009] The technical principle of the present application is that when water contacts the frame-shaped component, if the water is at the position of the side plate, it will flow downwards along the side plate until it enters the drainage mechanism, and if the water is at the position of the top plate, it will flow to the side plates along the convex circular arc on both sides, and the water will also flow to the lowest position of the circular arc depression, and gather at the middle position of the top plate, i.e. the connection between the top plates is always at the highest position, ensuring the dryness of the connection seam and avoiding corrosion and penetration of the connection seam by water.

[0010] Meanwhile, the convex circular arc structure cooperates with the concave circular arc structure to form a labyrinth-type waterproof structure, and also increases the contact area of the top plate and the side plate, making the connection between the two more stable.

[0011] Compared with the prior art, the present application has the following beneficial effects: the automatic drainage function of the frame-shaped component is realized by the cooperation of the convex circular arc and the circular arc depression top plate with the drainage mechanism, which solves the technical problem of poor water drainage on the outside of the existing spliced culvert, and avoids the problem of sealing and waterproof failure caused by water accumulation at the joint.

[0012] Further, the top plates between adjacent frame-shaped components are connected by bent bolts, and the side plates between adjacent frame-shaped components are also connected by bent bolts.

[0013] The beneficial effects are as follows: the bent bolt connection has good strength and can fine-tune the gap of the joint.

[0014] Further, the depth of the circular arc depression is 10-15 cm.

[0015] The beneficial effects are as follows: the circular arc depression of 10-15 cm can keep the water away from the joint of the top plate as much as possible while ensuring the strength of the top plate.

[0016] Further, two mutually symmetrical and inclined water guide ribs are provided on the outside of the two side plates, the symmetry plane of the water guide rib is located at the cross section of the deepest part of the circular arc depression, and the upper surface of the water guide rib is an inclined surface.

[0017] The beneficial effects are as follows: when the water flows on the side plate, it gradually separates from the center to both sides, avoiding the situation that the water flow only flows downwards from the middle of the frame-shaped component, causing the loss of silt at this position to form a hollow.

[0018] Further, the support protrusions located at both sides of the side plate are provided with drainage grooves, and the drainage mechanism comprises an inverted U-shaped pipe, and the two ends of the U-shaped pipe are connected to the drainage grooves on both sides.

[0019] The beneficial effects are as follows: through the inverted U-shaped pipe connecting the inner and outer sides of the side plate, when the water content on the outer side is too high, such as during heavy rain, the water can enter the drainage groove on the inner side through the U-shaped pipe and be quickly drained from both sides of the culvert; when there is a small amount of water, the water can naturally penetrate into the sand along the drainage groove on the outer side.

[0020] Further, the U-shaped pipe is provided with a valve at one end inside the side plate.

[0021] The beneficial effects are as follows: the valve is provided for preventing water on the outer side from flowing into the culvert when the culvert is full of water during continuous heavy rain, thereby reducing the burden of water drainage on the inner side of the culvert. The electromagnetic valve can be used for control.

[0022] Further, the drainage groove on the outer side of the side plate is provided with an inclined drainage surface away from the side plate on the side of the support protrusion.

[0023] The beneficial effects are as follows: the water reaching the drainage groove on the outer side can quickly penetrate along the inclined drainage surface away from the side of the support protrusion.

[0024] According to the construction method of the spliced drainage culvert, the method comprises the following steps:

[0025] S1, excavate a foundation pit according to the size of the design drawing;

[0026] S2, pretreatment: pouring and curing the top plate and the side plate; at the same time, pretreating the inner surface of the foundation pit in the S1 step;

[0027] S3, bottom installation of prefabricated part: after installing two side plates to the designated position in the foundation pit, pouring a bottom plate between the two side plates and curing;

[0028] S4, top installation of prefabricated part: aligning the two convex arc structures of one top plate with the concave arc structures on the top of the two side plates, and bonding at the interface with high-viscosity cement mortar;

[0029] S5, waterproofing of prefabricated part: repeating the S3 step and the S4 step in sequence, bonding between the top plate and the top plate and between the side plate and the side plate with high-viscosity cement mortar, and connecting with bent bolts, and finally gluing and fixing rubber waterstop outside between the top plate and the side plate, between the top plate and the top plate, and between the side plate and the side plate;

[0030] S6, backfilling: filling materials between the frame member and the foundation pit;

[0031] S7, laying the water-facing wall: excavating the two outermost frame members close to the outer end, and then pouring and forming the water-facing wall.

[0032] The beneficial effects are as follows: by filling the high-viscosity cement mortar at the interface, the circular-arc convex structure is formed at the interface, and then the rubber waterstop is attached, so that the water can be effectively prevented from staying at the interface.

[0033] Further, the pouring bottom plate method in the S3 step comprises:

[0034] The steel bar net is laid at the position where the bottom plate is poured, and the steel bar net needs to be double-welded and connected with the exposed steel bars at the supporting protrusions, and then pouring is performed.

[0035] The beneficial effects are as follows: the bottom plate formed by double-welding the steel bar net can be well connected with the side plates on both sides, that is, the connection strength of the bottom plate and the side plates is ensured, and the connection structure of the side plates and the top plate with the convex circular-arc structure and the concave circular-arc structure can make the overall connection strength of the frame-shaped component higher.

[0036] Further, the backfilling method in the S6 step comprises:

[0037] a. bottom layer backfilling: arranging large-grained sandstone at the drainage mechanism, covering a layer of fiber filter screen on the outside, then filling high-density sand to cover the fiber filter screen, and using water to compact;

[0038] b. middle layer backfilling: backfilling with sandstone multiple times until the top position of the top plate; each backfilling needs to be compacted by using a compaction device;

[0039] c. top layer backfilling: backfilling with sandstone multiple times, within 1m close to the top plate, the compaction device is controlled to be symmetrically and evenly horizontally rolled from both sides of the frame-shaped component, and a static load compaction method needs to be used; outside the range of 1m, the compaction device uses a vibration compaction method.

[0040] The beneficial effects are as follows: by arranging large-grained sandstone at the drainage mechanism and arranging a fiber filter screen outside the large-grained sandstone, when the water is too much, it will accumulate at the large-grained sandstone, and when it reaches a certain amount, the water will be discharged into the drainage groove inside the side plate quickly due to the siphon principle, so that the sand loss rate can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 It is a frame-shaped component structure schematic diagram of the embodiment 1 of the present application.

[0042] Figure 2 It is a frame-shaped component transverse sectional view of the embodiment 1 of the present application.

[0043] Figure 3 It is a frame-shaped component longitudinal sectional view of the embodiment 1 of the present application.

[0044] Figure 4This is a schematic diagram of the drainage mechanism connection structure in Embodiment 1 of the present invention.

[0045] Figure 5 This is a flowchart illustrating the construction method of the spliced ​​drainage culvert according to Embodiment 1 of the present invention.

[0046] Figure 6 This is a schematic diagram of the structure of the spliced ​​drainage culvert of Embodiment 1 of the present invention.

[0047] Figure 7 This is a schematic diagram of the steel bar welding structure in Embodiment 1 of the present invention.

[0048] Figure 8 This is a schematic diagram of the joint structure in Embodiment 1 of the present invention.

[0049] Figure 9 This is a schematic diagram of the drainage mechanism connection structure in Embodiment 2 of the present invention.

[0050] Figure 10 This is a schematic diagram of the drainage mechanism connection structure in Embodiment 3 of the present invention.

[0051] In the above attached figures: 1. Top plate; 11. Convex arc shape; 12. Arc recess; 13. Convex arc structure; 2. Side plate; 21. Concave arc structure; 22. Support protrusion; 23. Water guide rib; 231. Inclined surface; 24. Drainage groove; 241. Inclined drainage surface; 242. Lower sealing groove; 243. Upper water groove; 244. Separating rubber plate; 25. Inclined pipe; 26. U-shaped pipe; 261. Solenoid valve; 3. Bottom plate; 4. Bent bolt; 5. Reinforcing bar; 6. Foundation pit; 7. Large-particle sand and gravel; 71. Fiber filter screen; 8. High-density sand; 81. Sand and gravel; 9. High-viscosity cement mortar; 91. Rubber waterstop. Detailed Implementation

[0052] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0053] Example 1

[0054] like Figures 1-3 The spliced ​​drainage culvert shown includes frame-shaped components connected in sequence. The frame-shaped components include a top plate 1 and side plates 2 set on both sides of the top plate 1. The bottom of the two side plates 2 is connected by a bottom plate 3.

[0055] Specifically, the top plate 1 has a U-shaped structure. The top cross-section of the top plate 1 is a convex arc 11. The top of the top plate 1 has an arc recess 12 along the length direction. The depth of the arc recess 12 is 10-15cm. It is used to allow the water accumulated on the top to flow to both sides along the convex arc 11. Even if water accumulates, it will accumulate at the lowest point of the arc recess 12, keeping the joints between the top plates 1 relatively dry.

[0056] Specifically, the two ends of the bottom of the top plate 1 are integrally cast into a convex arc structure 13, the top of the side plate 2 is integrally cast into a concave arc structure 21, the convex arc structure 13 is connected with the concave arc structure 21, forming a stable and sealed connection structure of the top plate 1 and the side plate 2.

[0057] Specifically, the bottom of the side plate 2 is integrally cast into a support protrusion 22, which is used to stably support the side plate 2 and connect the bottom plate 3.

[0058] As shown in Figures 2-3 , the top plates 1 of adjacent frame members are connected by bent bolts 4, and the side plates 2 of adjacent frame members are also connected by bent bolts 4, which are used to ensure the strength of the connection of the frame members.

[0059] As shown in Figure 1 , two mutually symmetrical and inclined water guide ribs 23 are arranged on the outer sides of the two side plates 2, the symmetry plane of the water guide rib 23 is located at the deepest cross section of the arc recess 12, and the mutual connection of the two water guide ribs 23 is treated as a circular arc. The upper surface of the water guide rib 23 is an inclined surface 231, which is used to allow the water on the water guide rib 23 to naturally penetrate into the sand and gravel on the outside.

[0060] As shown in Figures 1-4 , the support protrusion 22 is located on both sides of the side plate 2 and is provided with a drainage groove 24, and the two drainage grooves 24 are uniformly connected by a drainage mechanism. Specifically, the drainage mechanism includes an inclined pipe 25, the highest end of the inclined pipe 25 is connected to the bottom of the drainage groove 24 on the outer side of the side plate 2, and the other end of the inclined pipe 25 is connected to the drainage groove 24 on the inner side of the side plate 2.

[0061] As shown in Figure 4 , the drainage groove 24 on the outer side of the side plate 2 is provided with an inclined drainage surface 241 on the side away from the side plate 2, which can allow water to naturally penetrate into the sand on the outside; the drainage groove 24 on the inner side of the side plate 2 includes a lower sealing groove 242 and an upper water tank 243 arranged in a vertical manner. The lower sealing groove 242 is connected to the inclined pipe 25 at the bottom, which is used to drain water on the outer side of the side plate 2, and when the lower sealing groove 242 is filled with water, the water on the outer side of the side plate 2 cannot continue to be drained through the lower side; the upper water tank 243 is connected to the inside of the frame member at the top, which is used to drain the accumulated water inside the frame member, and the separation between the lower sealing groove 242 and the upper water tank 243 is a piece of separation rubber plate 244.

[0062] As shown in Figures 5-6 , the construction method of the spliced drainage culvert includes:

[0063] S1, excavate the foundation pit 6 according to the size of the design drawing;

[0064] S2, pretreatment: pouring and curing the top plate 1 and the side plate 2; at the same time, the inner surface of the foundation pit 6 in the S1 step is pretreated, which includes but is not limited to replacing the sand and gravel, rolling and tamping or pouring a concrete cushion, to ensure that a flat and solid base is formed for the placement of the frame member.

[0065] S3, bottom installation of the prefabricated part: after the two side plates 2 are installed to the designated position in the foundation pit 6, the width is set, and then the bottom plate 3 is poured between the two side plates 2 and is watered for not less than 7 days.

[0066] The specific method for pouring the bottom plate 3 includes:

[0067] The reinforcing mesh is laid at the position where the bottom plate 3 needs to be poured, the reinforcing mesh is arranged by the reinforcing steel bars 5, and the reinforcing mesh needs to be double-sided welded and connected with the exposed reinforcing steel bars 5 at the support protrusions 22, the welding surface is as shown in Figure 7 , and then pouring is performed.

[0068] Before pouring the bottom plate 3, the floating slurry of the concrete surface of the side plate 2 in contact and the concrete surface in the foundation pit 6 is chipped and roughened, so as to realize good joint when pouring the bottom plate 3, the surface is washed with water before pouring the bottom plate 3, a layer of plain cement slurry is brushed, and then pouring is performed.

[0069] S4, top installation of the prefabricated part: the two convex circular arc structures 13 of a top plate 1 are aligned with the concave circular arc structures 21 at the top of the two side plates 2, and the high-viscosity cement mortar 9 is used for bonding at the joint, and in order to ensure that the high-viscosity cement mortar 9 is firmly bonded, a chamfer needs to be left at the joint.

[0070] S5, waterproofing of the prefabricated part: the S3 step and the S4 step are repeated in sequence, the high-viscosity cement mortar 9 is used for bonding between the top plate 1 and the top plate 1 and between the side plate 2 and the side plate 2, and for the same reason, a chamfer needs to be left at the joint, and the bent bolt 4 is used for connection, finally, the 25cm rubber waterstop 91 is glued and fixed outside between the top plate 1 and the side plate 2, between the top plate 1 and the top plate 1, and between the side plate 2 and the side plate 2, to ensure the waterproof performance, as shown in Figure 8 .

[0071] Specifically, in addition to using the high-viscosity cement mortar 9 for bonding, the asphalt wool and the polyurethane waterproof coating need to be closely attached according to actual needs, and finally the rubber waterstop 91 is pasted to improve the waterproof performance.

[0072] Specifically, in order to ensure the waterproof performance, the 30cm rubber waterstop 91 needs to be glued at the drainage groove 24, and the partition rubber plate 244 is clamped into the inner side of the drainage groove 24.

[0073] S6, backfilling: filling materials between the frame member and the foundation pit.

[0074] Specific backfilling methods include:

[0075] a. Bottom layer backfilling: large-grained sandstone 7 is arranged at the drainage mechanism, and a layer of fiber filter screen 71 is covered on the outside, then high-density sand 8 is filled to cover the fiber filter screen 71, and water is used for compaction to ensure that the bottom sand is compacted.

[0076] b. Middle layer backfilling: sandstone 81 is used for multiple backfilling until the top of the top plate 1; compaction equipment is used for compaction each time.

[0077] c. Top layer backfilling: sandstone 81 is used for multiple backfilling, and within the range of 1 m close to the top plate 11, the compaction equipment is controlled to be symmetrically and evenly horizontally rolled from both sides of the frame-shaped member, and a static load compaction method is required; outside the range of 1 m, the compaction equipment uses a vibration compaction method.

[0078] S7, paving the inverted water wall; excavate the two frame-shaped members at the outermost side close to the outer end, and then pour and form the inverted water wall.

[0079] Example 2

[0080] As shown in Figure 9 , the difference between this embodiment and example 1 is that the specific drainage mechanism includes an inverted U-shaped pipe 26, the two ends of the U-shaped pipe 26 are connected to the two side drainage grooves 24, the water flow inside and outside is balanced by using the siphon principle, the drainage groove 24 inside the side plate 2 is a common groove structure, the two ends of the U-shaped pipe 26 are connected to the bottom of the two drainage grooves 24, and the top of the U-shaped pipe 26 is lower than the opening position of the drainage groove 24 inside the side plate 2.

[0081] Example 3

[0082] As shown in Figure 10 , the difference between this embodiment and example 2 is that the U-shaped pipe 26 is provided with an electromagnetic valve 261 at one end inside the side plate 2, so that whether the drainage grooves 24 inside and outside the side plate 2 are connected can be manually intervened, such as closing the electromagnetic valve 261 when the drainage inside the culvert is not in time, reducing the pressure of the drainage groove 24 inside the culvert, and ensuring the normal passage of the culvert.

[0083] Finally, it should be pointed out that the above examples are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A modular drainage culvert, characterized in that: It includes frame-shaped components connected in sequence, each frame-shaped component including a top plate and side plates disposed on both sides of the top plate, with a bottom plate connecting the bottom of the two side plates; The top plate has a U-shaped structure, the top cross-section of the top plate is a convex arc shape, the top of the top plate has an arc recess along the length direction, and the bottom of the top plate has convex arc structures at both ends. The top of the side plate is provided with a concave arc structure, the convex arc structure is connected to the concave arc structure, the bottom of the side plate is provided with a support protrusion, and drainage mechanisms are evenly distributed along the length of the side plate at the connection between the support protrusion and the side plate. The two side plates are provided with two mutually symmetrical and inclined water guide ribs on their outer sides. The symmetrical plane of the water guide ribs is located at the cross-section of the deepest part of the arc concave, and the upper surface of the water guide ribs is an inclined surface. The supporting protrusion is provided with drainage grooves on both sides of the side plate. The drainage mechanism includes an inverted U-shaped pipe, and the two ends of the U-shaped pipe are connected to the drainage grooves on both sides. A valve is located at one end of the U-shaped tube on the inner side of the side plate; The drainage groove located on the outside of the side plate has an inclined drainage surface on the side of the support protrusion away from the side plate.

2. The spliced ​​drainage culvert as described in claim 1, characterized in that: The top plates of adjacent frame components are connected by bent bolts, and the side plates of adjacent frame components are also connected by bent bolts.

3. The spliced ​​drainage culvert as described in claim 1, characterized in that: The depth of the arc-shaped depression is 10-15cm.

4. A construction method for a spliced ​​drainage culvert, characterized in that: include: S1. Excavation of the foundation pit: Excavate the foundation pit according to the dimensions in the design drawings; S2. Pretreatment: Pour and cure the top slab and side slab of the spliced ​​drainage culvert as described in any one of claims 1-3; and at the same time, pretreat the inner surface of the foundation pit in step S1. S3. Precast component bottom installation: After installing the two side plates into the designated positions in the foundation pit, pour the bottom plate between the two side plates and cure it. S4. Precast component top installation: Align the two convex arc structures of one of the top plates with the concave arc structures on the top of the two side plates, and bond them at the joint with high-viscosity cement mortar. S5. Waterproofing of precast components: Repeat steps S3 and S4 in sequence, and use high-viscosity cement mortar to bond the top plate to the top plate and the side plate to the side plate, and connect them with bent bolts. Finally, glue and fix rubber waterstops on the outside of the top plate to the side plate, the top plate to the top plate, and the side plate to the side plate. S6. Backfilling: Filling the space between the frame member and the foundation pit with material; S7. Lay the water-supporting wall; excavate near the outermost end of the two outermost frame members and then pour the water-supporting wall into shape.

5. The construction method of a spliced ​​drainage culvert as described in claim 4, characterized in that: The method for pouring the base plate in step S3 includes: A steel mesh is laid at the location where the base slab needs to be poured, and the steel mesh needs to be welded to the exposed steel bars at the supporting protrusions on both sides before pouring.

6. The construction method of a spliced ​​drainage culvert as described in claim 4, characterized in that: The backfilling method in step S6 includes: a. Bottom layer backfill: Large-particle sand and gravel are placed at the drainage mechanism, and a layer of fiber filter is covered on the outside. Then, high-density sand is used to fill the gap until the fiber filter is covered, and water is used for compaction. b. Intermediate layer backfill: Use sand and gravel for multiple backfillings until the top of the slab is reached; each backfilling layer must be compacted using compaction equipment; c. Top layer backfill: Sand and gravel are used for multiple backfillings. Within 1m of the top slab, the compaction equipment is controlled to perform symmetrical and balanced horizontal compaction from both sides of the frame component, and static load compaction method is required. Beyond 1m, the compaction equipment uses vibratory compaction method.

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