Prefabricated UHPC cable trench cover plate and tunnel cable trench using same

Abstract

The utility model relates to a prefabricated UHPC cable trench cover plate which is used for being arranged above an opening of a cable trench in a covering mode, the cable trench comprises a cable trench body, step grooves are symmetrically formed in the two sides of the cable trench body, and the multiple cover plates are in lap joint in the step grooves side by side; the cover plate comprises a cover plate body and a height adjusting structure, the cover plate body is formed by integrally pouring UHPC materials, the cover plate body is of a rectangular plate body structure, the length L of the cover plate body is set to be 200-1200 mm, the width W of the cover plate body is set to be 200-1200 mm, and the thickness D of the cover plate body is set to be 20-50 mm; the height adjusting structure is arranged between the cover plate body and the step groove, and the matching height of the height adjusting structure and the cover plate body is matched with the depth of the step groove. Based on the ultra-high performance of the UHPC material, the thickness, the weight and the size of the tunnel cable trench cover plate are remarkably reduced, and workers can conveniently open the cover plate to maintain the cable trench through daily operation.

Description

Technical Field

[0001] The present application relates to the technical field of construction engineering, and in particular to a prefabricated UHPC cable trench cover and a tunnel cable trench using the same. Background Art

[0002] The tunnel cable trench is a project set up to ensure the normal operation of the equipment inside the tunnel. It mainly provides cable channels for power, communication, signal, lighting and other equipment, and ensures that the cables will not be affected by environmental factors such as tunnel traffic and water flow. It can not only ensure the normal operation of tunnel equipment, but also improve the efficiency and safety of tunnel construction and maintenance. It is widely used in highways, railways and mines. The tunnel cable trench is usually set on both sides of the tunnel pavement, including the cable trench body. The reinforced concrete cover plate is laid on the top of the cable trench body. The cover plate must be lifted when laying and repairing the cable trench. Considering that the cover plate usually needs to bear a certain load (such as being used as a pedestrian walkway or non-motorized vehicle lane), the traditional reinforced concrete cable trench cover plate usually needs to be designed with a larger thickness, and its thickness is usually about 8-10cm, resulting in a large self-weight of the cover plate, which brings many inconveniences to the workers' daily operation and maintenance. At the same time, due to the limitations of material properties, its bearing capacity and durability cannot meet the requirements of modern power facilities.

[0003] Therefore, developing a lightweight and easy-to-operate tunnel cable trench cover is of great significance for improving the maintenance efficiency of tunnel cable trenches. Summary of the invention

[0004] In view of the deficiencies of the above-mentioned prior art, the present application provides a prefabricated UHPC cable trench cover and a tunnel cable trench using the same. Based on the ultra-high performance of the UHPC material, the thickness and weight of the tunnel cable trench cover are significantly reduced, making it easier for workers to open the cover for daily maintenance of the cable trench.

[0005] To achieve the above objectives, this application adopts the following technical solutions:

[0006] In the first aspect, the present application provides a prefabricated UHPC cable trench cover plate, which is used to cover the opening of a cable trench, wherein the cable trench includes a cable trench body, and step grooves are symmetrically arranged on both sides of the cable trench body, and a plurality of the prefabricated UHPC cable trench cover plates are overlapped in parallel above the step grooves, wherein the prefabricated UHPC cable trench cover plate includes a cover plate body and a height adjustment structure which are respectively integrally cast from UHPC materials; the cover plate body adopts a rectangular plate structure, and the long side of the cover plate body is a splicing side for matching with an adjacent cover plate body; the wide side of the cover plate body is an installation side for matching with the step groove; the height adjustment structure is arranged between the cover plate body and the step groove, and the matching height of the height adjustment structure and the cover plate body matches the depth of the step groove.

[0007] Furthermore, the long side dimension L of the cover body is set at 200-1200 mm, the wide side dimension W is set at 200-1200 mm, and the thickness dimension D is set at 20-50 mm.

[0008] Furthermore, a hand hole groove is provided on the long side of the cover body, and the hand hole groove runs through the upper and lower surfaces of the cover body.

[0009] Furthermore, an anti-skid structure is provided on the upper surface of the cover body, and the anti-skid structure is protruded from the surface of the cover body, and the protruding height of the anti-skid structure is ≤2mm.

[0010] Furthermore, the height adjustment structure includes a height adjustment block, and the wide side of the cover body is provided with an installation groove running through the upper and lower surfaces thereof. The height adjustment block includes a height adjustment part and a connecting part, and the connecting part is clamped in the installation groove, and the height of the connecting part matches the thickness of the cover body.

[0011] Furthermore, the cross section of the connecting portion is a trapezoid, the short side of the trapezoid is flush with the wide side of the cover body, and the long side of the trapezoid extends into the interior of the cover body.

[0012] Furthermore, the height adjustment block is fixedly mounted on the side wall of the step groove by means of anchor bolts.

[0013] Furthermore, the height adjustment structure includes a height adjustment strip, which is arranged below the wide side of the cover body, the length of the height adjustment strip matches the width of the cover body, and the width of the height adjustment strip is less than the width of the step groove.

[0014] Furthermore, the height adjustment strip is fixed below the cover plate body by a plurality of embedded bolts.

[0015] In a second aspect, the present application provides a tunnel cable trench, comprising a cable trench body and the prefabricated UHPC cable trench cover plate described in the first aspect, wherein the prefabricated UHPC cable trench cover plate is arranged on top of the cable trench body.

[0016] The beneficial effects of this application are:

[0017] By adopting the above technical solution, the utility model realizes the lightweight of the cable trench cover, reduces the difficulty of workers' operation, and improves the efficiency of cable trench maintenance. At the same time, by designing a matching UHPC height adjustment structure, the cover can be used in conjunction with the existing cast-in-place reinforced concrete cable trench, enhancing practicality and versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1-Figure 2According to some embodiments of the present application, a schematic structural diagram of a prefabricated UHPC cable trench cover is shown;

[0019] Figure 3 According to Embodiment 1 of the present application, a schematic structural diagram of a cover plate body is shown;

[0020] Figure 4 According to Embodiment 1 of the present application, a schematic diagram of the structure of the height adjustment block is shown;

[0021] Figure 5-Figure 6 According to Example 1 of the present application, a schematic diagram of the cooperation between the prefabricated UHPC cable trench cover and the cable trench body is shown;

[0022] Figure 7-Figure 8 According to some embodiments of the present application, schematic structural diagrams of other implementations of the cover plate body and the height adjustment block are shown;

[0023] Figure 9-11 According to Example 2 of the present application, a structural schematic diagram of a prefabricated UHPC cable trench cover is shown. DETAILED DESCRIPTION

[0024] The following is a more detailed description of the technical features and advantages of the present application in conjunction with the accompanying drawings, so that the advantages and features of the present application can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0025] It should be noted that, in the description of the present application, terms such as "up", "down", "left", "right", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0026] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the importance of the technical features shown.

[0027] In addition, it should be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] See also Figure 1-Figure 2The embodiment of the present application provides a prefabricated UHPC cable trench cover 100, which is used to cover the top of the cable trench opening. The cable trench includes a cable trench body 200, and step grooves 210 are symmetrically arranged on both sides of the cable trench body 200. A plurality of covers 100 are overlapped in parallel in the step grooves 210 on both sides. The prefabricated UHPC cable trench cover 100 can protect the cable equipment in the cable trench while meeting the use needs of pedestrians and non-motor vehicles.

[0029] The prefabricated UHPC cable trench cover 100 includes a cover body 110 and a height adjustment structure 120 .

[0030] The cover body 110 is a rectangular plate structure integrally cast from UHPC material. The wide side of the cover body 110 is used to cooperate with the step groove 210 of the cable trench 200 to achieve the installation of the cover 100. The length dimension L of the cover body 110 is determined according to the spacing between the step grooves 210 on both sides. In order to facilitate the installation and uncovering of the cover body 110, the length dimension L is determined by reducing the spacing between the step grooves 210 on both sides by 5-10mm. Specifically, the length dimension L of the cover body 110 of this embodiment can be set between 200-1200mm, the width dimension W can be set between 200-1200mm, and the thickness dimension D can be set between 20-50mm. The above-mentioned dimensional design is obtained by the inventor through verification based on the performance of the material and the load condition.

[0031] UHPC material is a new type of concrete material with ultra-high strength, high durability and excellent crack resistance. Its raw materials mainly include cement, mineral powder, fly ash, quartz sand, high-strength fiber, etc. It is a composite material that combines fiber reinforcement technology with the design concept of ultra-fine-grained dense materials, through the optimization of grading ratio design, and produced by high-temperature heat-sealing preparation process. UHPC material has excellent properties such as high toughness, high strength, and high durability. Its strength grade is not less than 120MPa, and its flexural strength is not less than 16MPa. The excellent performance of UHPC material enables the cable trench cover body 110 of this embodiment to greatly reduce thickness, reduce weight, and improve the convenience of installation and maintenance while maintaining sufficient bearing capacity. At the same time, UHPC material also has excellent weather resistance, corrosion resistance and fire resistance, and can maintain the long-term stability and safety of the cover body 110 for a long time.

[0032] In this embodiment, the size design of the cover plate body 110 is obtained through a large number of accurate verifications. The applicant has determined the optimal size of the cover plate body 110 by comprehensively considering the load-bearing requirements of the cable trench, the stress analysis of the cover plate, and the performance characteristics of the UHPC material. This size design not only meets the safety and practicality requirements of the cable trench cover plate 100, but also achieves efficient use of materials and cost reduction.

[0033] The height adjustment structure 120 is arranged between the cover plate body 110 and the step groove 210, and is used to raise the cover plate body 110 to be flush with the upper surface of the step groove 210. The matching height of the height adjustment structure 120 and the cover plate body 110 matches the depth of the step groove 210. The height adjustment structure 120 is also integrally cast using UHPC material.

[0034] Compared with the traditional reinforced concrete structure cover plate, the cover plate 100 of this embodiment can not only greatly reduce the cross-sectional thickness, but also significantly improve the tensile strength, folding resistance, bending resistance, wear resistance, fire resistance, corrosion resistance and other properties of the cover plate, while reducing the size and weight of the cover plate and improving its durability. At the same time, by designing a height adjustment structure 120 under the cover plate body 110, the cable trench cover plate 100 of this embodiment can be adapted to the existing cast-in-place reinforced concrete cable trench for use, which greatly improves the versatility and practicality of this embodiment. Example 1

[0035] See also Figure 3-Figure 6 , is a schematic diagram of the structure of the cover body 110 in this embodiment. The width*width*thickness of the cover body 110 is 730mm*496mm*30mm, and each corner of the cover body 110 can be rounded with a radius of r≤2mm to avoid scratching workers or breaking the cover body 110 during operation. An anti-slip structure 113 is provided on the upper surface of the cover body 110, and the anti-slip structure 113 is used to improve the anti-slip performance of the upper surface of the cover body 110. The above-mentioned anti-slip structure 113 can be a convex structure of various shapes, such as circular convexity, strip convexity, elliptical convexity, etc. In this embodiment, the anti-slip structure 113 is a pebble-shaped convex pattern, and the convex height of the anti-slip structure 113 is ≤2mm. A hand hole groove 111 is designed in the middle of the long side of the cover body 110, which runs through the upper and lower surfaces of the cover body 110. When two adjacent cover bodies 110 are overlapped in parallel, the two hand hole grooves 111 are combined to form a hand hole space 114 for external force to lift the cover body 110. By providing the above-mentioned hand hole groove 111 on the cover body 110, during the operation of the tunnel, when workers inspect and maintain the cable trench 200, they do not need to use other tools. The hand hole groove 111 can be used for the staff to apply force, and the cover body 110 can be directly opened. Holding the hand hole grooves 111 on both sides of the same cover body 110 with both hands, the cover body 110 can also be moved, which is convenient and easy.

[0036] In addition, the hand hole groove 111 designed on the cover body 110 also has the following functions:

[0037] 1. Facilitate heat dissipation of cables in the cable trench;

[0038] 2. If it is rainy, the hand hole groove 111 can also be used to allow rainwater to flow into the ditch.

[0039] The cross-section of the hand hole groove 111 can be square, rectangular, circular, trapezoidal, etc. In the present embodiment, the cross-section of the hand hole groove 111 is a trapezoid, the long side dimension of the trapezoid is set to 450 mm, the depth of the hand hole groove 111 is set to 15 mm, and the hypotenuse angle of the trapezoid is set to 130-135°.

[0040] See also Figure 4 , is a schematic diagram of the structure of the height adjustment block 120a used as the height adjustment structure in this embodiment, and the height adjustment block 120a includes a height adjustment portion 121 and a connecting portion 122 arranged above the height adjustment portion 121. Mounting grooves 112 are provided at both ends of the wide side of the cover body 110 and penetrate the upper and lower surfaces thereof.

[0041] See also Figure 5-Figure 6 When two adjacent cover bodies 110 are assembled, the two mounting grooves cooperate to form an assembled structure 115. The connection portion 122 of the height adjustment block 120 is just inserted into the above-mentioned assembled structure 115. The height adjustment portion 121 is arranged between the lower surface of the cover body 110 and the step surface of the step groove 210. The thickness of the connection portion 122 matches the thickness of the cover body 110. The thickness of the height adjustment portion 121 is determined by subtracting the thickness of the cover body 110 from the depth of the step groove 210. In this embodiment, the depth of the step groove 210 is 80 mm, the thickness of the connection portion 122 is 30 mm, and the thickness of the height adjustment portion 121 is 50 mm. By setting the height adjustment block 120a, the upper surface of the cover body 110 is flush with the upper surface of the cable trench body 200, so that this embodiment can be adapted to the existing cast-in-place reinforced concrete cable trench.

[0042] In order to facilitate the installation of the cover body 110 and the height adjustment block 120a, a gap of 3-5 mm is set between the cover body 110 and the side wall of the step groove 210, and a gap of 3-5 mm is set between each side wall of the installation groove 112 and the connecting part 122.

[0043] In order to fix the cover plate, an anchor hole 123 is also provided on the height adjustment block 120a. The height adjustment block 120 is fixed to the side wall of the step groove 210 by the anchor 130. At least two anchor holes 123 are arranged on each height adjustment block 120a. In order to improve the aesthetics, the anchor hole 123 can be designed as a countersunk hole. Through load-bearing and strength calculations, in this embodiment, the length of the height adjustment part 121 is designed to be 250mm, and the height of the entire height adjustment block 120 is 80mm. Each corner of the height adjustment block 120 can be rounded with a radius of r≤2mm.

[0044] During installation, each height-adjusting block 120 a is first fixed to the cable trench body 200 by means of anchor bolts 130 , and then the cover plate body 110 is laid.

[0045] In this embodiment, the UHPC usage of a single cover plate body 110 is 0.0107 cubic meters, and the weight is about 26 kilograms; the UHPC usage of a single height adjustment block 120a is 0.00064 cubic meters, and the weight is about 1.6 kilograms. The cover plate (thickness 80mm) originally used for the cable trench and made of ordinary reinforced concrete material weighs about 70 kilograms. The overall weight of the cover plate scheme of this embodiment can be reduced by more than half. However, its compressive strength and durability are further improved compared with the original cover plate.

[0046] See also Figure 7-Figure 8 In other embodiments, the mounting groove 112 may also be arranged in the middle of the wide side of the cover body 110, but arranging the mounting groove 112 at both ends of the short side can make the installation of the cover body 110 more convenient. In addition, the cross section of the connecting portion 122 may be designed to be square or as Figure 8 As shown in the trapezoid, the long side of the trapezoid is arranged inside the cover body 110, and the short side is flush with the short side of the cover body 110. This structural form can improve the connection strength between the height adjustment block 120a and the cover body 110. Example 2

[0047] See also Figure 9-11 In this embodiment, the structure of the cover body 110 is the same as that of the embodiment 1, and the height adjustment is in the form of a height adjustment strip 120b. The height adjustment strip 120b is arranged below the wide side of the cover body 110. The length of the height adjustment strip 120b matches the width dimension of the cover body 110, and the thickness is the depth of the step groove 210 minus the thickness of the cover body 110. The width dimension can be the width of the step groove 210 minus 5-10mm. The height adjustment strip 120b is fixed to the bottom of the cover body 110 by galvanized bolts 140. The galvanized bolts 140 can be pre-buried inside the height adjustment strip 120b. When the thickness of the cover body 110 is 30mm, the pre-buried exposed part of the galvanized bolts 140 is 25mm to ensure the connection strength.

[0048] During installation of this embodiment, the height-adjusting strip 120 b is first connected to the cover plate body 110 , and then the connected cover plate is laid as a whole in the step groove 210 of the cable trench body 200 .

[0049] The technical parameters of this embodiment are as follows: the UHPC usage of a single cover plate body 110 is 0.01082 cubic meters, and the weight is about 27 kilograms; the UHPC usage of a single height adjustment block 120b is 0.0011 cubic meters, and the weight is about 2.75 kilograms.

[0050] Comparing Example 1 and Example 2 with ordinary concrete cover plates, since the compressive and tensile strengths of the materials are doubled, the design thickness is much smaller than that of ordinary reinforced concrete, and the volume and weight of the components are greatly reduced, especially in thin-plate components, the reduction is usually more than 60%, and the cost savings in transportation and installation are very obvious. At the same time, due to the significant improvement in material strength and durability, the maintenance and replacement workload is greatly reduced, and the comprehensive cost during the total service life will be significantly reduced.

[0051] The cable trench cover of the present application is made of UHPC material, and the specific manufacturing process includes steps such as mixing, pouring, and curing. During the mixing process, according to the performance requirements of the UHPC material, the proportion of the raw materials and the mixing time are accurately controlled to ensure the quality of the concrete. During the pouring process, mold forming is adopted to ensure the dimensional accuracy and surface flatness of the cover body 110 and the height adjustment structure 120. During the curing process, according to the hardening characteristics of the UHPC material, the curing time and temperature are reasonably controlled to ensure the strength and durability of the cover.

[0052] The prefabricated UHPC cover plate of the present application has a wide range of application prospects. It can be widely used in cable trench projects in the fields of power, communication, transportation, etc., providing a strong guarantee for the safe operation of the cable trench. At the same time, the cover plate of the present invention can also be customized according to actual needs to meet the requirements of cable trenches of different specifications and sizes.

[0053] In summary, the present application provides a cable trench cover based on ultra-high performance concrete (UHPC), which has extremely high strength and durability, while the thickness is greatly reduced, achieving efficient utilization and installation, and has important practical value and broad application prospects.

[0054] In the description of this specification, the description with reference to the terms "some embodiments", "some examples", "exemplarily", "example", "preferably", or "further" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0055] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A prefabricated UHPC cable trench cover plate, used to cover the opening of a cable trench, wherein the cable trench comprises a cable trench body, and step grooves are symmetrically arranged on both sides of the cable trench body, and a plurality of the prefabricated UHPC cable trench cover plates are overlapped in parallel above the step grooves, characterized in that: The prefabricated UHPC cable trench cover includes a cover body and a height adjustment structure which are integrally cast from UHPC material; the cover body adopts a rectangular plate structure, the long side of the cover body is a splicing side, which is used to cooperate with the adjacent cover body; the wide side of the cover body is an installation side, which is used to cooperate with the step groove; the height adjustment structure is arranged between the cover body and the step groove, and the matching height of the height adjustment structure and the cover body matches the depth of the step groove.

2. The prefabricated UHPC cable trench cover according to claim 1, characterized in that: The long side dimension L of the cover plate body is set at 200-1200 mm, the wide side dimension W is set at 200-1200 mm, and the thickness dimension D is set at 20-50 mm.

3. The prefabricated UHPC cable trench cover according to claim 2, characterized in that: A hand hole groove is arranged on the long side of the cover body, and the hand hole groove runs through the upper and lower surfaces of the cover body.

4. The prefabricated UHPC cable trench cover according to claim 1, characterized in that: An anti-skid structure is disposed on the upper surface of the cover body. The anti-skid structure is convexly disposed on the upper surface of the cover body. The convex height of the anti-skid structure is ≤2 mm.

5. The prefabricated UHPC cable trench cover according to claim 1, characterized in that: The height adjustment structure includes a height adjustment block, and a mounting groove penetrating the upper and lower surfaces of the cover body is opened on the wide side thereof. The height adjustment block includes a height adjustment portion and a connecting portion, and the connecting portion is clamped in the mounting groove, and the height of the connecting portion matches the thickness of the cover body.

6. The prefabricated UHPC cable trench cover according to claim 5, characterized in that: The cross section of the connecting portion is a trapezoid, the short side of the trapezoid is flush with the wide side of the cover body, and the long side of the trapezoid extends into the interior of the cover body.

7. The prefabricated UHPC cable trench cover according to claim 5, characterized in that: The height adjustment block is fixedly mounted on the side wall of the step groove through anchor bolts.

8. The prefabricated UHPC cable trench cover according to claim 1, characterized in that: The height adjustment structure includes a height adjustment strip, which is arranged below the wide side of the cover body. The length of the height adjustment strip matches the width of the cover body, and the width of the height adjustment strip is less than the width of the step groove.

9. The prefabricated UHPC tunnel cable trench cover according to claim 8, characterized in that: The height adjustment strip is fixed below the cover plate body by a plurality of embedded bolts.

10. A tunnel cable trench, characterized in that: It comprises a cable trench body and the prefabricated UHPC cable trench cover plate according to any one of claims 1 to 9, wherein the prefabricated UHPC cable trench cover plate is arranged above the cable trench body.

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