Foundation pit periphery anti-seepage drainage ditch and construction method thereof

Abstract

The application provides a foundation pit periphery anti-seepage drainage ditch and a construction method thereof, and is used in the technical field of foundation pit engineering. The device comprises a ditch body, an anti-skid cover plate and a water baffle. The top end of the ditch body is provided with a drainage groove. The anti-skid cover plate is buckled on the top end of the ditch body. The water baffle is integrally formed on the outer side wall of the ditch body by injection molding and is parallel to the anti-skid cover plate. The water baffle is arranged on both sides of the ditch body in an integral molding manner, physical isolation is formed by the water baffle, and the water baffle is embedded in the backfill soil or the pavement structure on both sides of the drainage ditch. The seepage problem of the connection part between the drainage ditch and the backfill soil or the pavement structure on both sides is effectively solved, good anti-seepage effect is achieved, construction is convenient, the construction process is simplified, and the construction efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of foundation pit engineering technology, and in particular relates to a seepage prevention and drainage ditch around a foundation pit and its construction method. Background Technology

[0002] During the construction of foundation pit support, in order to prevent surface water from flowing into the foundation pit and causing erosion of the support structure, or surface water from seeping into the support structure and affecting its stability, thus creating safety hazards, drainage and seepage prevention around the foundation pit are particularly important, especially in expansive soil areas. Usually, a water interception ditch is set outside the water-stop curtain at the top of the foundation pit, and a drainage ditch is set around the bottom of the pit after the excavation of the foundation pit is completed. Existing technologies typically employ brick masonry, concrete casting, or prefabricated drainage ditches for interception and drainage. Brick masonry ditches are prone to cracking and breakage due to foundation pit settlement, and cracks easily form at the joints between the ditch and the paved road surface, allowing surface water to seep in and affecting the stability of the support structure. While cast-in-place concrete interception and drainage ditches offer high strength, their construction requires multiple steps, including concrete subbase construction, formwork erection, concrete pouring, and formwork removal. This process is complex, cumbersome, and incurs high material and labor costs, significantly impacting construction efficiency. Prefabricated drainage ditches simplify the construction process, but seepage is common at their connections to surrounding road surfaces or ditch sections, affecting the stability of the support structure and the safety of the foundation pit. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a seepage-proof drainage ditch around the foundation pit and its construction method. The construction is convenient, effectively solves the problem of easy water seepage on both sides of the drainage ditch, and enhances the seepage-proof effect of the drainage ditch.

[0004] The technical solution adopted in this invention is: a seepage-proof drainage ditch around a foundation pit, including a ditch body, an anti-slip cover plate, and a water-retaining plate; a drainage groove is provided at the top of the ditch body; the anti-slip cover plate is fastened to the top of the ditch body; the water-retaining plate is integrally formed on the outer wall of the ditch body by injection molding and is parallel to the anti-slip cover plate.

[0005] Furthermore, the cross-sectional shape of the trench is a rectangle or trapezoid with an open top.

[0006] Furthermore, the outer wall is provided with a reinforcing member.

[0007] Furthermore, the baffle plate is positioned near the top of the ditch.

[0008] Furthermore, the water baffle is 8-12cm away from the top of the ditch.

[0009] Furthermore, the baffle plate includes a straight section and a curved section. The straight section is connected to the outer side wall, and the curved section is connected to the end of the straight section away from the ditch body and bends towards the top of the ditch body.

[0010] Furthermore, it also includes a connector, which is bolted to the outside of the connection portion of the adjacent groove; a sealant is provided between the connector and the groove.

[0011] Furthermore, the ditch includes a straight ditch and an arc-shaped ditch, the arc-shaped ditch being used at the bends of the drainage ditch.

[0012] Furthermore, the top of the inner wall of the drainage trough is provided with a positioning step, the anti-slip cover is snapped onto the positioning step, and is provided with a water leakage hole.

[0013] The construction method for the seepage prevention and drainage ditch around the foundation pit as described above includes:

[0014] Lay a sand cushion layer and compact it, then install drainage ditches at the predetermined locations;

[0015] The adjacent drainage ditches are connected by connectors;

[0016] Fill the gap between the drainage ditch and the connector with sealant;

[0017] Backfilling of earthwork on both sides of the drainage ditch;

[0018] Construction of the road surface on both sides of the drainage ditch is carried out so that the water-retaining plate is embedded in the road surface;

[0019] Install anti-slip cover.

[0020] The advantages and positive effects of this invention are:

[0021] (1) This application uses an integral molding method to set water-blocking plates on both sides of the ditch, which form a physical isolation and are embedded in the backfill soil or road surface on both sides of the drainage ditch. This effectively solves the seepage problem at the connection between the drainage ditch and the backfill soil or road surface structure, and achieves a good anti-seepage effect.

[0022] (2) Convenient construction. The construction can be completed simply by burying the drainage ditch in the preset position, which simplifies the construction process and improves construction efficiency.

[0023] (3) By setting up reinforcing components, the rigidity of the outer wall of the ditch is improved, the stability of the drainage ditch is enhanced, and deformation and damage to the drainage ditch can be effectively avoided.

[0024] (4) By using connectors and sealing, the overall rigidity of the trench connection is enhanced, the connection structure between trenches is more stable, and the risk of leakage at the connection is reduced.

[0025] (5) It is easier to manufacture, transport and install, and can be reused, thus reducing overall costs. Attached Figure Description

[0026] Figure 1 This is a schematic cross-sectional view of a drainage ditch according to a specific embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the connection between adjacent channels according to a specific embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of an arc-shaped groove structure according to a specific embodiment of the present invention.

[0029] In the picture:

[0030] 1. Trench body; 2. Reinforcing components; 3. Anti-slip cover; 4. Water barrier; 5. Road surface structure; 6. Anti-slip mat; 7. Connecting components. Detailed Implementation

[0031] The embodiments of the present invention will now be described with reference to the accompanying drawings.

[0032] like Figure 1 As shown, this embodiment of the invention proposes a seepage-proof drainage ditch around a foundation pit, including a ditch body 1, an anti-slip cover plate 3, and a water-blocking plate 4; a drainage groove is provided at the top of the ditch body 1; the anti-slip cover plate 3 is fastened to the top of the ditch body 1; the water-blocking plate 4 is integrally formed on the outer side wall of the ditch body 1 by injection molding and is parallel to the anti-slip cover plate 3.

[0033] Both the aforementioned trench body 1 and the water-retaining plate 4 are injection molded parts, integrally formed using injection molding technology to create a single structure. The water-retaining plate 4 is installed along the length of the trench body 1, with one end connected to the outer wall of the trench body 1 and the other end extending away from the trench body 1. In use, the trench body 1 is buried in the backfill soil or road structure 5, and the water-retaining plate 4 is embedded in the backfill soil or road structure 5, parallel to the cover plate, and vertically installed in the gap between the trench body 1 and the backfill soil or road structure 5, forming a physical barrier. This directly cuts off the path of surface water to seep into the soil or road surface through the gap, thereby achieving a good seepage prevention effect and ensuring the stability and safety of the surrounding structure of the foundation pit.

[0034] Preferably, the above-mentioned trench 1 and water-retaining plate 4 are made of high molecular polymer materials, such as HDPE or other plastic materials. They are dense and impermeable, lightweight and flexible, which can effectively prevent cracks and breaks caused by foundation pit settlement, and achieve isolation of surface water around the foundation pit. At the same time, they are easier to manufacture, transport and install, reducing overall costs.

[0035] Through the above technical solution, water-retaining plates 4 are installed on both sides of the ditch body 1 in an integrated molding manner. Compared with the existing drainage ditches constructed with bricks or concrete, the construction can be completed simply by burying the entire drainage ditch in the preset position, which simplifies the construction process and improves construction efficiency. The water-retaining plates 4 form a physical isolation, which effectively solves the problem of water seepage on both sides of the drainage ditch and achieves a good anti-seepage effect.

[0036] The aforementioned anti-slip cover 3 is installed at the top of the ditch body 1 to seal the drainage channel, prevent debris from falling into the drainage channel, and reduce the occurrence of blockages. The anti-slip cover 3 is fastened to the ditch body 1, allowing for easy installation and disassembly. At the same time, the anti-slip cover 3 has a certain pressure-bearing capacity, which can form a safety protection for the internal structure, prevent damage to the internal structure, and extend its service life. Preferably, the connection between the anti-slip cover 3 and the ditch body 1 is provided with an anti-slip pad 6 to prevent the anti-slip cover 3 from slipping relative to the ditch body 1, improve the stability of the connection between the two, and at the same time play a role in sealing and shock absorption.

[0037] Preferably, in the above embodiments, the anti-slip cover 3 can be made of materials such as stainless steel, aluminum alloy or glass fiber reinforced plastic, or other materials with good stability and compressive strength, without limitation.

[0038] Preferably, in the above embodiments, the anti-slip mat 6 can be made of natural rubber, silicone, plastic or silicone rubber, etc., which has good anti-slip properties and stability, and can absorb the impact force transmitted by the anti-slip cover plate 3.

[0039] Furthermore, in this embodiment, the cross-sectional shape of the ditch body 1 is a rectangle or trapezoid with an open top. The ditch body 1 includes opposing sidewalls and a bottom plate disposed at the bottom of the sidewalls, and the whole has a strip-shaped structure with a drainage groove at the top, which allows it to be placed stably in the excavated foundation trench, making it less prone to movement and easier to install and position; at the same time, the bottom plate and sidewalls are attached to the surrounding foundation soil, increasing the contact area between the drainage ditch and the foundation, which is beneficial to the stability of the drainage ditch during use.

[0040] Furthermore, in this embodiment, the cross-sectional shape of the drainage ditch is arc-shaped or U-shaped. This design makes the inner wall of the drainage ditch smoother, effectively preventing weeds and other impurities from clogging the ditch and ensuring smooth drainage.

[0041] Furthermore, the aforementioned outer wall is provided with a reinforcing member 2 to enhance the rigidity of the outer wall, strengthen the stability of the drainage ditch, and prevent deformation and damage to the drainage ditch. The reinforcing member 2 is installed along the length of the drainage ditch, and multiple reinforcing members 2 can be installed according to the height of the drainage ditch, and are evenly distributed along the height of the drainage ditch.

[0042] Furthermore, in this embodiment, the water-blocking plate 4 is positioned near the top of the trench 1. That is, the water-blocking plate 4 is closer to the ground surface, which makes the path of the infiltrated water shorter and the resistance less, thus cutting off the seepage earlier and preventing the water from continuing to spread deeper into the soil below the water-blocking plate 4, thereby achieving a better seepage prevention effect.

[0043] Preferably, the water-retaining plate 4 is 8-12cm away from the top of the trench 1. Normally, the top of the trench 1 is flush with the anti-slip cover 3 and the ground. Therefore, the water-retaining plate 4 is buried at a depth of 8-12cm, so that it can be as close to the ground as possible while being covered with a sufficient depth of backfill soil or road structure 5, making it less likely to be disturbed and exposed on the ground surface, thus avoiding damage to the water-retaining plate 4.

[0044] Furthermore, in this embodiment, the water-retaining plate 4 includes a straight section and a curved section. The straight section is connected to the outer wall, and the curved section is connected to the end of the straight section away from the ditch 1 and bends towards the top of the ditch 1. The straight section is used to seal the structural gap between the ditch 1 and the soil, preventing surface water from seeping along the gap; the curved section forms an upward water-retaining edge, allowing seepage water to flow only above the water-retaining plate 4 and making it difficult for it to cross the curved section and flow below the water-retaining plate 4, further enhancing the seepage prevention effect.

[0045] Furthermore, such as Figure 2 As shown, the seepage prevention and drainage ditch around the foundation pit in this embodiment of the application also includes a connector 7. The connector 7 is connected to the outside of the connection part of the adjacent ditch body 1 by bolts; a sealant is provided between the connector 7 and the ditch body 1. Specifically, the shape of the connector 7 is adapted to the outer contour of the ditch body 1, including two side connecting plates and a bottom connecting plate. The side connecting plates are used to fit against the outer wall of the ditch body 1, and the bottom connecting plate is used to fit against the bottom plate of the ditch body 1. The connecting plates cover the entire range of the outer wall and bottom plate of the ditch body 1, and form a rigid connection with the ditch body 1 by bolts. In order to ensure the sealing of the connection part between the ditch bodies 1, the interface between the connector 7 and the ditch body 1 is filled with sealant to prevent water in the ditch from seeping out from the connection part of the ditch body 1 and then seeping into the soil from the interface between the connector 7 and the ditch body 1.

[0046] By using connector 7, the connection is more stable and the risk of leakage at the connection point is reduced compared to the socket connection between the two sections of the trench 1 in the prior art.

[0047] In this embodiment, the connector 7 is made of metal. For example, it can be made of stainless steel plate, galvanized steel plate, aluminum alloy plate, etc., which can enhance the overall rigidity of the connection part of the trench 1 while playing a connecting role, and avoid the formation of weak links at the connection of the trench 1.

[0048] Furthermore, such as Figure 3As shown in the embodiment of this application, the ditch 1 includes a straight ditch 1 and an arc-shaped ditch 1. The arc-shaped ditch 1 is used at the bend of the drainage ditch, so that the drainage at the bend is smoother and less prone to accumulating silt.

[0049] Furthermore, in this embodiment, the top of the inner wall of the drainage ditch is provided with a positioning step, the anti-slip cover 3 is snapped onto the positioning step, and a drainage hole is provided. The shape of the positioning step is adapted to the anti-slip cover 3, so that the anti-slip cover 3 can be installed more accurately in the set position. The anti-slip component is set between the positioning step and the anti-slip cover 3, making it easier to control the installation quality of the anti-slip cover 3 and the anti-slip component. The drainage hole facilitates rainwater to flow into the drainage ditch and then be discharged through the drainage ditch. Preferably, the anti-slip cover 3 is provided with dense perforations, so that the top of the anti-slip cover 3 also has an anti-slip effect.

[0050] Furthermore, this application embodiment also proposes a construction method for the above-mentioned seepage prevention and drainage ditch around the foundation pit, including:

[0051] S1. Lay a sand cushion layer and compact it, then install drainage ditches at the preset locations;

[0052] Excavate the foundation at the predetermined location, ensuring the trench width and depth meet specifications. During excavation, take care to maintain the stability of the soil on both sides of the trench and avoid excessive disturbance. After the foundation excavation and compaction, lay a sand cushion layer and use a rammer to compact the sand cushion layer to a compaction degree of over 90%, ensuring the sand cushion layer is flat and has sufficient bearing capacity. During the laying of the cushion layer, strictly control the elevation of each point to ensure that the drainage slope meets the requirements.

[0053] The drainage ditch was then placed on the compacted sand cushion layer to ensure that the ditch body 1 was stable. The actual elevation of the ditch body 1 was checked to ensure that the elevation met the design requirements.

[0054] S2. Connect adjacent drainage ditches via connector 7;

[0055] Adjacent sections of the ditch 1 are connected by connectors 7. Connectors 7 are placed at the connection points of the ditch 1 and fixed to the outside of the ditch 1 with bolts to ensure a firm connection.

[0056] S3. Fill the gap between the drainage ditch and the connector 7 with sealant;

[0057] Fill all openings in the gap between the drainage ditch and connector 7 with sealant evenly to ensure a tight seal. After installing all sections of the ditch 1, check and adjust the entire drainage ditch to ensure that the elevation and slope of each section of the ditch 1 meet the design requirements.

[0058] S4. Backfill the soil on both sides of the drainage ditch.

[0059] Backfill sand on both sides of the trench 1, ensuring that the sand is evenly distributed and free of large stones or other debris. During backfilling, protective material should be wrapped around the outside of the water retainer 4 for safety protection. Backfilling should be carried out manually or with small machinery. Near the water retainer 4, manual spreading and light compaction should be used. Backfilling should be done in layers, with each layer not exceeding 150mm in thickness, and the compaction degree should reach more than 95%.

[0060] S5. Carry out road surface construction on both sides of the drainage ditch so that the water retaining plate 4 is embedded in the road surface;

[0061] In this embodiment, concrete pavement is laid on both sides of the drainage ditch, and the height of the pavement should be flush with the height of the anti-slip cover 3 after installation. When hardening the pavement, the protective material on the outside of the water-blocking plate 4 is removed, and the water-blocking plate 4 is embedded in the concrete to ensure that the concrete around the water-blocking plate 4 is poured densely and that the two can be tightly bonded to ensure its impermeability.

[0062] S6. Install anti-slip cover plate 3.

[0063] In this application, to further improve the firmness of the anti-slip cover 3, the anti-slip cover 3 is also provided with connecting holes and is connected to the groove body 1 by rivets.

[0064] In this embodiment of the application, the aforementioned seepage prevention and drainage ditch around the foundation pit is a temporary measure during the foundation pit construction phase. It can be removed before the next phase of construction. The drainage ditch after removal can still maintain its structural integrity and can be reused elsewhere.

[0065] The advantages and positive effects of this invention are:

[0066] (1) This application uses an integral molding method to set water-blocking plates on both sides of the ditch, which form a physical isolation and are embedded in the backfill soil or road surface on both sides of the drainage ditch. This effectively solves the seepage problem at the connection between the drainage ditch and the backfill soil or road surface structure, and achieves a good anti-seepage effect.

[0067] (2) Convenient construction. The construction can be completed simply by burying the drainage ditch in the preset position, which simplifies the construction process and improves construction efficiency.

[0068] (3) By setting up reinforcing components, the rigidity of the outer wall of the ditch is improved, the stability of the drainage ditch is enhanced, and deformation and damage to the drainage ditch can be effectively avoided.

[0069] (4) By using connectors and sealing, the overall rigidity of the trench connection is enhanced, the connection structure between trenches is more stable, and the risk of leakage at the connection is reduced.

[0070] (5) It is easier to manufacture, transport and install, and can be reused, thus reducing overall costs.

[0071] The embodiments of the present invention have been described in detail above, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A seepage-proof drainage ditch around a foundation pit, characterized in that: It includes a ditch body, an anti-slip cover, and a water baffle; the top of the ditch body is provided with a drainage groove; the anti-slip cover is fastened to the top of the ditch body; the water baffle is integrally formed on the outer wall of the ditch body by injection molding and is parallel to the anti-slip cover.

2. The seepage-proof drainage ditch around the foundation pit according to claim 1, characterized in that: The cross-sectional shape of the trench is a rectangle or trapezoid with an open top.

3. The seepage-proof drainage ditch around the foundation pit according to claim 1, characterized in that: The outer wall is provided with a reinforcing member.

4. The seepage-proof drainage ditch around the foundation pit according to claim 1, characterized in that: The water baffle is positioned near the top of the ditch.

5. The seepage-proof drainage ditch around the foundation pit according to claim 4, characterized in that: The water baffle is located 8-12 cm from the top of the ditch.

6. The seepage-proof drainage ditch around the foundation pit according to any one of claims 1-5, characterized in that: The baffle plate includes a straight section and a curved section. The straight section is connected to the outer wall, and the curved section is connected to the end of the straight section away from the ditch and bends towards the top of the ditch.

7. The seepage-proof drainage ditch around the foundation pit according to claim 6, characterized in that: It also includes a connector, which is bolted to the outside of the connection portion of the adjacent trench; a sealant is provided between the connector and the trench.

8. The seepage-proof drainage ditch around the foundation pit according to claim 1, characterized in that: The ditch includes straight ditch and arc-shaped ditch, with the arc-shaped ditch used at the bends of the drainage ditch.

9. The seepage-proof drainage ditch around the foundation pit according to claim 1, characterized in that: The top of the inner wall of the drainage channel is provided with a positioning step, the anti-slip cover is snapped into the positioning step, and is provided with a water leakage hole.

10. The construction method of the seepage prevention and drainage ditch around the foundation pit as described in any one of claims 1-9, characterized in that, include: Lay a sand cushion layer and compact it, then install drainage ditches at the predetermined locations; The adjacent drainage ditches are connected by connectors; Fill the gap between the drainage ditch and the connector with sealant; Backfilling of earthwork on both sides of the drainage ditch; Construction of the road surface on both sides of the drainage ditch is carried out so that the water-retaining plate is embedded in the road surface; Install anti-slip cover.

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