A drainage board connection device

Abstract

This utility model discloses a drainage board connecting device, including a first clamping plate and a second clamping plate. The two plates are parallel and connected by mortise and tenon joints. One side of the first clamping plate is designated as the first plane, and one side of the second clamping plate is designated as the second plane. Each plane has a straight groove, and both ends of the grooves are open and have the same width. The two grooves together form a receiving hole, and one end of each of the two drainage boards is inserted into the receiving hole. In addition, barbs are provided in the grooves to prevent the drainage boards from falling out of the receiving hole. This device clamps the two drainage boards to be connected by the two clamping plates, making the connection more secure and sealed. The mortise and tenon joint increases the reliability of the device. This device does not affect the degradation process of the biodegradable drainage board, ensures that the drainage channel is stable and unobstructed during the construction period, and automatically disconnects after construction.

Description

Technical Field

[0001] This utility model belongs to the field of engineering construction materials technology, and specifically relates to a drainage board connection device. Background Technology

[0002] In geotechnical engineering, drainage treatment of soft soil foundations is a crucial step in the construction process. Drainage treatment promotes soil consolidation, significantly improves foundation bearing capacity, and controls post-construction settlement. Currently, the most common practice for drainage treatment of soft soil foundations is to use plastic drainage boards combined with vacuum preloading. In this method, the plastic drainage board, as a key component for transmitting and distributing negative pressure and collecting and draining groundwater, directly determines the final drainage effect. Traditional plastic drainage boards are usually made of high-density polyethylene (HDPE) or polypropylene (PP). When used in complex strata such as ultra-soft soil and deep silty soil, traditional plastic drainage boards are difficult to degrade in the foundation, leaving drainage channels after construction. Water continues to drain from the foundation, leading to excessive or uneven post-construction settlement in some areas. Therefore, for projects such as high-grade roads, airport runways, and port terminals, which are extremely sensitive to post-construction settlement, the use of traditional plastic drainage boards is insufficient to meet the project requirements.

[0003] One solution to the above problems is to replace plastic drainage boards with biodegradable drainage boards, allowing them to degrade naturally after the foundation has solidified. However, biodegradable drainage boards are still relatively new products, and their production technology is not yet mature, making them unsuitable for large-scale deployment. Considering that in actual construction, drainage boards are connected one by one to form a vertical drainage channel, stopping drainage does not require all boards to degrade; only one board needs to degrade to break the drainage channel. Therefore, only one of the drainage boards forming the channel needs to be biodegradable. However, current methods of connecting drainage boards to form drainage channels generally use simple overlapping or pin-type mechanical connections, which have limited fixing capacity. During construction, biodegradable drainage boards may loosen their connection with other drainage boards due to degradation, causing damage to the drainage channel's seal and preventing the pressure gradient from reaching deeper layers, significantly reducing the drainage depth. Therefore, there is an urgent need for a new type of drainage board connection device that can significantly improve the firmness and sealing performance, ensuring long-term stable operation under negative pressure, to connect biodegradable drainage boards with adjacent plastic drainage boards, guaranteeing drainage effectiveness and improving reliability. Utility Model Content

[0004] The purpose of this utility model is to provide a drainage board connection device, which is used to reliably connect a biodegradable drainage board to two adjacent traditional plastic drainage boards during the drainage process, so as to ensure the connection reliability of the drainage boards and the vacuum sealing of the drainage channel during construction, and to achieve the purpose of automatically disconnecting the drainage channel after construction.

[0005] The technical solution adopted in this utility model is as follows: A drainage board connecting device is disclosed, wherein the drainage board to be connected is strip-shaped and includes a first clamping plate and a second clamping plate. The first clamping plate and the second clamping plate are parallel and connected. The side of the first clamping plate closer to the second clamping plate is designated as the first plane, and the side of the second clamping plate closer to the first clamping plate is designated as the second plane. The first plane and the second plane are in close contact. Each of the first plane and the second plane has a groove, both of which are straight grooves and neither end of the groove is closed. The two grooves have the same width and together form a receiving hole. One end of each of the two drainage boards to be connected is inserted into the receiving hole, and neither drainage board can be removed from the receiving hole.

[0006] To ensure a more secure connection between adjacent drainage boards and maintain the airtightness of the drainage channel at the joint, this invention employs a clamping structure. The main body, consisting of a first and second clamping plate, simultaneously holds both drainage boards. This not only ensures a strong connection but also isolates the connection from the ground, guaranteeing the airtightness of the drainage channel. Furthermore, this connection device does not interfere with the contact between the biodegradable drainage board and the soil. After prolonged burial in the soil, the biodegradable drainage board degrades and integrates into the soil. The drainage channel at this location is interrupted, preventing further drainage and settlement.

[0007] Further optimization involves fixing multiple tenons on the first clamping plate and opening multiple mortises on the second clamping plate. The number of tenons and mortises is the same, with each tenon inserted into its corresponding mortise and tenon, and each tenon forming a mortise and tenon structure with its corresponding mortise. The first clamping plate and the second clamping plate are connected by the mortise and tenon structure.

[0008] Using mortise and tenon joints not only improves the strength of the connection between the first and second clamping plates, but also allows for small displacements parallel to the mating surface between the first and second clamping plates. Thus, even if uneven land settlement causes relative displacement between the first and second clamping plates, stress concentration on the first clamping plate will not lead to material failure, increasing the reliability of the connection device.

[0009] Further optimization involves fixing multiple barbs at both ends of the bottom surface of the groove. All barbs at the same end have the same barb tip orientation, and the barb tips at both ends have opposite orientations.

[0010] When the barbs are in contact with the drain plate, and the drain plate tends to be pulled away from the receiving hole, the barbs will hook onto the surface of the drain plate and apply a force toward the center surface, making it difficult for the drain plate to leave the receiving hole. The resistance caused by the barbs to the drain plate is greater than the friction force experienced when the drain plate is in direct contact with the bottom surface of the groove.

[0011] Further optimization includes four retaining strips, two of which are fixedly installed on the first clamping plate and the other two are fixedly installed on the second clamping plate. The length of all four retaining strips is equal to the width of the groove. The two retaining strips on the same clamping plate are located at the two ends of the groove, and the two ends of the retaining strips abut against the two side walls of the groove, and the retaining strips are in contact with the bottom surface of the groove.

[0012] Due to the presence of barbs, the drainage board does not fit snugly against the bottom of the groove. In actual engineering applications, it is difficult to achieve a complete seal between two adjacent drainage boards. As a result, soft soil particles will seep into the gap between the drainage board and the first or second clamping plate under negative pressure. The purpose of setting up the retaining strip is to prevent soft soil particles from seeping into the connecting device and then into the drainage channel, causing blockage of the drainage channel.

[0013] Further optimization also includes a sealing sleeve. The whole connecting the first clamping plate and the second clamping plate is called the main body. The sealing sleeve is formed by the shrinkage of the geomembrane that completely covers the main body after being heated.

[0014] If the first and second clamping plates are not tightly bonded, soft soil particles may still seep into the connecting device through the gaps between them, thus entering the drainage channel. The function of the sealing sleeve is to completely enclose the main body, preventing the gaps between the first and second clamping plates from contacting the soil, thereby preventing soft soil particles from seeping into the connecting device. Geomembrane is a common seepage-proof material, made primarily of plastic. A sealing sleeve is formed by completely enclosing the main body with a geomembrane made of thermoplastic plastic and then heating it to cause it to shrink.

[0015] The beneficial effects of this utility model device are as follows: 1. The connecting device of this utility model clamps the two drainage boards to be connected with two clamping plates, so that the connection has a high degree of firmness and sealing. In addition, the two clamping plates are connected by tenon and mortise, which increases the reliability of the device.

[0016] 2. This device will not affect the degradation process of the biodegradable drainage board, can keep the drainage channel stable and unobstructed for a period of time, and can also ensure that the drainage channel automatically disconnects after a period of time. Attached Figure Description

[0017] Figure 1A schematic diagram of the overall structure of the connecting device of this utility model in a dispersed state; Figure 2 Schematic diagram of the first clamping plate structure; Figure 3 Schematic diagram of the second clamping plate structure; Figure 4 Schematic diagram of barb structure; Figure 5 A partial structural diagram including the tenon and mortise; Figure 6 A schematic diagram of the overall structure of the device in its assembled state. Detailed Implementation

[0018] The technical solutions of the present utility model will be further described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0019] A drainage board connecting device includes a first clamping plate 1 and a second clamping plate 2. In this embodiment, both the first clamping plate 1 and the second clamping plate 2 are rectangular plates with the same shape and size, a length of 400 mm and a width of 200 mm. Both rectangular plates are integrally molded using injection molding, and their material is high-density polyethylene (HDPE), the same as that used in traditional plastic drainage boards, to ensure material compatibility and coordinated deformation capability. The first clamping plate 1 and the second clamping plate 2 are parallel and fixedly connected. The side of the first clamping plate 1 closest to the second clamping plate 2 is designated as the first plane, and the side of the second clamping plate 2 closest to the first clamping plate 1 is designated as the second plane. The first plane and the second plane are tightly fitted and completely overlap. Each of the first and second planes has a groove 4 for accommodating the drainage board. The two grooves 4 are of the same size, and their extension direction is parallel to the length direction of the rectangular plate. Neither end of the groove 4 is closed. The width and depth of the groove 4 are matched with the width and thickness of the drainage plate connected to the device. In this embodiment, the groove 4 is 100 mm wide and 5 mm deep to ensure that the drainage plate can be securely clamped between the first clamping plate 1 and the second clamping plate 2. The positional distribution of the first clamping plate 1 and the second clamping plate 2 in the dispersed and assembled states are as follows: Figure 1 and Figure 6 As shown, after the first clamping plate 1 and the second clamping plate 2 are assembled, the two grooves 4 form a receiving hole for inserting the drainage board.

[0020] Multiple barbs 8 are fixedly installed on the bottom surface of both grooves 4. All barbs 8 are wedge-shaped and uniform in shape and size, and the direction of the tips of all barbs 8 is opposite to the length extension direction of the groove 4. Viewed from the direction perpendicular to the bottom surface of the groove 4, the shape of the barb 8 is an isosceles triangle with a vertex angle of 5.7° and a base length of 5 mm. Taking the direction perpendicular to the bottom surface of the groove 4 as the thickness direction, the barb 8 is thickest at the vertex, with a thickness of 1 mm, and gradually thins from the vertex to the base. The multiple barbs 8 are distributed in a rectangular array. The barbs 8 in each groove 4 form two identical rectangular arrays. The barbs 8 in the same row of the rectangular array are arranged in a sawtooth structure. The two rectangular arrays are located at the two ends of the groove 4, respectively. The purpose of the barbs 8 is to hook the surface of the drainage plate when it tends to be pulled out of the receiving hole, thereby generating great resistance and preventing the drainage plate from falling out of the device. The distribution of the barbs 8 on the first clamping plate 1 and the second clamping plate 2 is as follows. Figure 2 and Figure 3 As shown, the rectangular array formed by the 8 barbs is as follows: Figure 4 As shown.

[0021] Eight tenons 6 are fixedly installed on the first plane. The eight tenons 6 are of identical specifications and made of HDPE, a material with a certain degree of flexibility. The tenons 6 are prism-shaped, with an arrowhead-shaped section perpendicular to the height of the prism, pointing away from the first plane. The eight tenons 6 are arranged in two rows of four, with each row distributed along the two long edges of the first plane. The distribution of the tenons 6 on the first plane is as follows: Figure 2 As shown. The tenon 6 has a height of 11 mm. The arrow-shaped cross-section of the tenon 6 is divided into an isosceles triangle and a rectangle. The isosceles triangle has a base length of 14 mm and a vertex angle of 64°. The two sides of the rectangle parallel to the base of the isosceles triangle are 8 mm in length. Eight mortises 7 are provided on the second plane. All mortises 7 are the same in shape and size and are adapted to the shape and size of the tenon 6. The opening of the mortise 7 is a rectangle with a length of 11 mm and a width of 8 mm. When the first clamping plate 1 and the second clamping plate 2 are assembled, all tenons 6 are inserted into the corresponding mortises 7. The tenon 6 of the above shape has two guide surfaces 6a that are both at 32° to the direction indicated by the arrow, which facilitates the insertion of the tenon 6 into the mortises 7. The tenon 6 also has two locking surfaces 6b that are parallel to the first plane and connected to the guide surfaces 6a. These are used to lock the tenon 6 after it is inserted. The distribution of the guide surfaces 6a and the locking surfaces 6b is as follows. Figure 5As shown. The overall depth of the mortise 7 is 16 mm, slightly greater than the distance between the tip of the tenon 6 and the first plane, allowing the tenon 6 to be fully inserted into and engaged with the mortise 7. During insertion, the tenon 6 expands the mortise 7, making its opening larger than normal. When the tenon 6 is inserted to engage with the mortise 7, the mortise 7 returns to its original shape. Therefore, the engagement of the tenon 6 with the mortise 7 can be determined by observing the size of the opening. After engagement, the locking surface 6b presses firmly against the inner wall of the mortise 7, forming a mechanical self-locking mechanism. This structure has a tensile strength far exceeding that of the HDPE material itself, ensuring the first clamping plate 1 and the second clamping plate 2 are fixedly connected through the aforementioned mortise and tenon structure, thus guaranteeing the reliability of the device under complex stress conditions.

[0022] The device also includes four retaining strips 5 and a sealing sleeve. The four retaining strips 5 are of identical specifications. Two retaining strips 5 are fixedly installed on the first clamping plate 1, and the other two are fixedly installed on the second clamping plate 2. The length of each retaining strip 5 is equal to the width of the groove 4. Both ends of all retaining strips 5 abut against the side walls of the groove 4, and all retaining strips 5 are in contact with the bottom surface of the groove 4. The retaining strips 5 are installed on the edge of the bottom surface of the groove 4 as shown in the image. Figure 1-3 and Figure 6 As shown. The sealing sleeve is manufactured on-site by the operator. The whole formed by connecting the first clamping plate 1 and the second clamping plate 2 is called the main body. The operator first completely and evenly covers the main body with a geomembrane made of polyethylene material with a thickness of 0.5 mm. Then, the geomembrane is heated evenly as a whole, causing the geomembrane to shrink and form a sealing sleeve that tightly wraps around the outside of the main body.

[0023] The overall operation process of this utility model device is as follows: S1. Prepare a biodegradable drainage board and two sets of devices. Place the two ends of the biodegradable drainage board into the grooves 4 of the two second clamping plates 2 respectively. Then place the ends of the two traditional plastic drainage boards that are in contact with the biodegradable drainage board into the grooves 4 of the two second clamping plates 2 respectively, keeping the ends of the two traditional plastic drainage boards in the grooves 4 aligned with the two ends of the biodegradable drainage board respectively.

[0024] S2. Place the first clamping plate 1 parallel to the second clamping plate 2, and insert the tips of all tenons 6 into the mortises 7 one by one; then apply pressure to the first clamping plate 1 and the second clamping plate 2 to bring them closer together, while observing the state of the tenons 6 in the mortises 7. Stop applying pressure after the tenons 6 and the mortises 7 are engaged.

[0025] S3. The geomembrane made of thermoplastic material is evenly wrapped around the outside of the whole consisting of the first clamping plate 1 and the second clamping plate 2. Then, the geomembrane is evenly heated with a hot air gun. After being heated, it shrinks rapidly and tightly wraps around the outer surface of the whole consisting of the first clamping plate 1 and the second clamping plate 2, forming a sealing sleeve as an airtight barrier.

[0026] After the above process, the connected drainage chain can be used like a regular drainage chain. It is vertically inserted into the soft soil foundation according to the conventional construction process. Then, a sealing film is covered on the ground surface and vacuum preloading is applied to the drainage chain to start the drainage process, so that the water in the soil seeps into the drainage channel and flows upward and is discharged.

Claims

1. A drainage board connecting device, wherein the connected drainage board is strip-shaped, characterized in that: Includes a first clamping plate (1) and a second clamping plate (2). The first clamping plate (1) and the second clamping plate (2) are parallel and connected. The side of the first clamping plate (1) that is close to the second clamping plate (2) is called the first plane, and the side of the second clamping plate (2) that is close to the first clamping plate (1) is called the second plane. The first plane and the second plane are in close contact. Each of the first plane and the second plane has a groove (4). Both grooves (4) are straight grooves, and the two ends of the two grooves (4) are not closed. The two grooves (4) have the same width and enclose a receiving hole. The two drainage boards that need to be connected each have one end inserted into the receiving hole, and neither drainage board can be removed from the receiving hole.

2. The drainage board connecting device as described in claim 1, characterized in that: The first clamping plate (1) is fixedly equipped with multiple tenons (6), and the second clamping plate (2) is provided with multiple mortises (7). The number of tenons (6) and mortises (7) is the same. Each tenon (6) is inserted into the corresponding mortise (7), and each tenon (6) and the corresponding mortise (7) form a tenon-and-mortise structure. The first clamping plate (1) and the second clamping plate (2) are connected by the tenon-and-mortise structure.

3. The drainage board connecting device as described in claim 1, characterized in that: Multiple barbs (8) are fixedly installed at both ends of the bottom surface of the groove (4). All the barbs (8) at the same end have the same barb tip orientation, and the barbs (8) at both ends have opposite barb tips orientation.

4. The drainage board connecting device as described in claim 1, characterized in that: It also includes four retaining strips (5), two of which are fixedly installed on the first clamping plate (1) and the other two are fixedly installed on the second clamping plate (2). The length of the four retaining strips (5) is equal to the width of the groove (4). The two retaining strips (5) on the same clamping plate are located at the two ends of the groove (4) respectively. The two ends of the retaining strips (5) abut against the two side walls of the groove (4) respectively, and the retaining strips (5) are in contact with the bottom surface of the groove (4).

5. A drainage board connecting device as described in claim 1, characterized in that: It also includes a sealing sleeve. The whole that connects the first clamping plate (1) and the second clamping plate (2) is called the main body. The sealing sleeve is formed by the shrinkage of the geomembrane that completely covers the main body after being heated.

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