A cable laying process for offshore booster station

Abstract

The present invention relates to a cable laying process for an offshore substation, including a fireproof plugging module provided at a hole where the cable passes through a deck, in a bridge provided with a cable, and in a hole where the cable passes through a wall, the fireproof plugging module including an L-shaped connecting piece, a bottom plate bracket, and a fireproof building block, the L-shaped connecting piece is fixedly mounted on the inner walls on both sides of the deck by a nut, the bottom plate bracket is mounted on the L-shaped connecting piece, the bridge includes a first bridge and a second bridge, the cables include a high-voltage cable, a low-voltage cable, a control cable, and a communication cable, the first bridge is provided with a high-voltage cable, and the second bridge is provided with a low-voltage cable, a control cable, and a communication cable. The present invention casts a fireproof plugging module at a hole through the deck by a self-flowing foaming plugging agent, fills fireproof blocks in the bridge and in the hole where the cable passes through the wall to achieve the effect of fireproof plugging, and lays the high-voltage cable using an independent bridge to reduce electromagnetic interference and reduce mutual interference between circuits.

Description

Technical Field

[0001] The invention relates to the field of cable laying, and in particular to a cable laying process for an offshore booster station. Background Art

[0002] At present, the cables of offshore substations are regarded as the blood vessels and nerves of the substations, which play a vital role in the stable and effective operation of the substations. In offshore substations, construction teams often install high-voltage cables, low-voltage cables, control cables and communication cables in the same bridge, which causes electromagnetic interference between cables and increases loop energy consumption. With the increase of cable fire and combustion accidents, such as the large number of strong and weak cables in offshore power stations, dense laying and the height difference ratio of cable shafts, natural ventilation is formed, and some cable tunnels have narrow spaces. If these places catch fire, if they cannot be effectively prevented, the fire will spread along the cable group, expand the scope of the fire, and burn the entire machine room and base station, causing power outages or communication interruptions, etc., which will cause huge economic losses. It is imperative to carry out fireproof blocking and flame retardant treatment on the fire separation of cable shafts, wall holes, cable bridges and floor (A) slabs of offshore substations to prevent the fire from spreading through these openings and gaps, prevent it before it burns, reduce the incidence of accidents, and prevent and reduce economic losses. A common sealing method at construction sites is to only seal the outside of the bridge with cement mortar or fireproof putty, but the sealing is not tight. After searching, the publication number CN203230961U is found to be a fireproof sealing structure for cable bridges passing through floor slabs. The gap between the water retaining platform and the bridge is filled with fireproof rock wool or fireproof putty. The filling should be dense, and the space in the bridge is filled with fireproof bags. The holes on both sides of the floor slab are tightly sealed with fireproof boards or steel plates. The cutting and splicing of fireproof boards should be regular. Fireproof putty is used to caulking the periphery of the fireproof boards, the junction of the fireproof boards and the bridge, and the joints of the fireproof boards. The caulking should be flat and smooth. Because the fireproof mortar of this patent is not very plastic, the space inside the bridge frame will still be transparent when filled with fireproof bags, and the sealing is not tight. Although the waterproof platform built around the bridge frame can play a certain role in water blocking, it still cannot fundamentally prevent the infiltration of seawater and rainwater in the harsh environment of offshore booster stations with wind and waves. Summary of the invention

[0003] (1) Technical issues to be resolved

[0004] In view of the deficiencies in the prior art, the present invention is a cable laying process for an offshore substation, which aims to solve the technical problems of electromagnetic interference between cables and loose fireproof sealing under the prior art.

[0005] (2) Technical solution

[0006] In order to solve the above technical problems, the present invention is a cable laying process for an offshore substation, comprising a fireproof blocking module, a bridge, a deck, and a cable. A fireproof blocking module is provided at a hole where the cable passes through the deck, in a bridge provided with a cable, and in a hole where the cable passes through a wall. The fireproof blocking module comprises an L-shaped connecting piece bottom plate bracket and a fireproof building block. The L-shaped connecting piece is fixedly mounted on the inner walls on both sides of the deck by nuts, and the bottom plate bracket is mounted on the L-shaped connecting piece. The bridge comprises a first bridge and a second bridge. The cable comprises a high-voltage cable, a low-voltage cable, a control cable, and a communication cable. The first bridge is provided with a high-voltage cable, and the second bridge is provided with a low-voltage cable, a control cable, and a communication cable. The specific operation steps are as follows:

[0007] S1: Before construction, clean up the scattered debris, dust, oil stains, etc. in the fireproof blocking module to ensure that the fireproof blocking module is dry and clean;

[0008] S2: Model the bottom of the longitudinal fire blocking module without bottom surface at the reserved hole of the deck, cut the insulation board into insulation boards of corresponding size according to the size and shape of the fire blocking module manually and install them on the bottom plate bracket as the support of the main fireproof material;

[0009] S3: Then use fireproof tape to seal the gaps between the insulation board and the holes where the cables pass through the deck, and between the insulation board and the deck;

[0010] S4: Pour the self-flowing foaming plugging agent into the fireproof plugging module until it is flush with the surface of the deck. It can be touched by finger after the foaming stops in half an hour at room temperature;

[0011] S5: Then, in each bridge with cables at intervals of no more than 20 meters, and in the holes where the cables pass through the wall, fireproof blocks cut into corresponding sizes by hand are filled into the positions of the fireproof blocking modules according to the size and shape of the fireproof blocking modules. The gaps between the fireproof blocks and the cables, bridges and walls are filled and smoothed with fireproof sealant, and then a high-density fireproof coating is applied on the surface of the fireproof blocks;

[0012] S6: Then, apply cable fire retardant paint within 1 meter before and after each fire blocking module;

[0013] S7: Finally, install the protective steel plate on the exposed surface of the fireproof blocking module where the cable passes through the deck hole, and then install the bridge cover.

[0014] The above-mentioned first bridge is a galvanized trough-type bridge, and the second bridge is provided with an additional partition. The installation distance between the first bridge and the second bridge is not less than 5cm. The low-voltage cable is arranged on one side of the additional partition, and the control cable and the communication cable are arranged on the other side of the additional partition.

[0015] The above-mentioned first bridge is a galvanized trough-type bridge, and the second bridge is provided with an additional partition. The installation distance between the first bridge and the second bridge is not less than 5cm. The low-voltage cable is arranged on one side of the additional partition, and the control cable and the communication cable are arranged on the other side of the additional partition.

[0016] The height of the L-shaped connecting piece is 30-35 cm.

[0017] The L-shaped connecting piece (101) and the bottom plate bracket (102) are both made of stainless steel.

[0018] The area where the high-voltage cable (6) passes through the deck (4) is set as a stainless steel deck with a thickness of not less than 0.6 cm.

[0019] In the above S1, the shape of the reserved hole is a rectangle.

[0020] The above-mentioned cable is a soft cable.

[0021] In the second bridge of the above-mentioned S4, each cable is tightly wrapped with fireproof tape, the wrapping height is 30-35cm, and the gap between each cable is tightly filled with silicone fireproof mud.

[0022] (3) Beneficial effects

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention casts fireproof plugging modules through self-flowing foaming plugging agents at holes that penetrate the deck, fills fireproof blocks in the bridge and the holes where cables pass through the wall, and is coated with high-density fireproof coatings to achieve the effect of fireproof plugging, thereby increasing the weather resistance and water resistance of the blocking position, while increasing the stability of its structure, and reducing the economic losses caused by disasters. In addition, high-density fireproof coatings are applied on the surfaces of fireproof blocks in the bridge and the holes where cables pass through the wall, and then cable fireproof coatings are applied within 1 meter before and after each fireproof plugging module, thereby greatly increasing safety.

[0025] 2. In the present invention, a high-voltage cable is arranged in the first bridge, and a low-voltage cable, a control cable and a communication loop cable are arranged in the second bridge. The high-voltage cable is laid in an independent bridge and is kept 5 cm away from the low-voltage cable, the control cable and the communication cable to reduce electromagnetic interference and mutual interference between loops, thereby improving the performance stability of the booster station.

[0026] 3. The present invention adopts soft cables, which is convenient for construction.

[0027] 4. The area where the high-voltage cable of the present invention passes through the deck is set as a stainless steel deck with a thickness of not less than 0.6 cm to avoid the increase of circuit energy consumption due to the generation of eddy currents. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments:

[0029] Figure 1 It is a schematic diagram of the process of the present invention;

[0030] Figure 2 This is a schematic structural diagram of a fireproof blocking module for a hole where a cable passes through a deck according to the present invention;

[0031] Figure 3 It is a cross-sectional schematic diagram of the fireproof blocking module in the bridge frame of the present invention.

[0032] Sealing gaps after filling with fireproof blocks

[0033] The markings in the accompanying drawings are: fire blocking module 1, bridge 2, deck 3, cable 4, L-shaped connecting piece 101, bottom plate bracket 102, fireproof building block (103), first bridge 201, second bridge 202, high-voltage cable 5, low-voltage cable 6, control cable 7, communication loop cable 8, and partition (9). DETAILED DESCRIPTION

[0034] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0035] according to Figure 1-3 A cable laying process for an offshore substation shown in the figure comprises a fireproof blocking module 1, a bridge 2, a deck 3, and a cable 4. A fireproof blocking module 1 is provided at the hole where the cable 4 passes through the deck 3, in the bridge 2 provided with the cable 4, and in the hole where the cable 4 passes through the wall. The fireproof blocking module 1 comprises an L-shaped connecting piece 101, a bottom plate bracket 102, and a fireproof building block 103. The L-shaped connecting piece 101 is fixedly mounted on the inner walls on both sides of the deck 3 by nuts, and the bottom plate bracket 102 is mounted on the L-shaped connecting piece 101. The bridge 2 comprises a first bridge 201 and a second bridge 202. The cable 4 comprises a high-voltage cable 5, a low-voltage cable 6, a control cable 7, and a communication cable 8. The first bridge 201 is provided with a high-voltage cable 5, and the second bridge 202 is provided with a low-voltage cable 6, a control cable 7, and a communication cable 8. The specific operation steps are as follows:

[0036] S1: Before construction, clean up the scattered debris, dust, oil stains, etc. in the fireproof blocking module 1 to ensure that the fireproof blocking module 1 is dry and clean;

[0037] S2: Model the bottom of the longitudinal fire blocking module 1 without a bottom surface at the hole reserved in the deck 3, and manually cut the insulation board into insulation boards of corresponding sizes according to the size and shape of the fire blocking module 1 and install them on the bottom plate bracket 102 as a support for the main fireproof material;

[0038] S3: Then, use fireproof tape to tightly seal the gaps between the insulation board and the cable 4 that penetrate the holes of the deck 3 and the gaps between the insulation board and the deck 3;

[0039] S4: pour the self-flowing foaming plugging agent into the fireproof plugging module 1 until it is flush with the surface of the deck 3, and the foaming stops at room temperature for half an hour and can be touched by finger;

[0040] S5: Then, in each bridge 2 where the cable 4 is arranged at intervals not greater than 20 meters, and in the hole where the cable 4 passes through the wall, the fireproof blocks 103 cut into corresponding sizes by hand are filled into the position of the fireproof blocking module 1 according to the size and shape of the fireproof blocking module 1, and the gaps between the fireproof blocks 103 and the cables 4, bridge 2 and wall are filled and smoothed with fireproof sealant, and then a high-density fireproof coating is applied on the surface of the fireproof blocks 103;

[0041] S6: Then, within 1 meter before and after each fire blocking module 1, apply fire retardant paint to the cable 4;

[0042] S7: Finally, a protective steel plate is installed on the exposed surface of the fire blocking module 1 where the cable 4 passes through the deck hole, and then the bridge cover is installed.

[0043] Furthermore, the first bridge 201 is a galvanized trough-type bridge, and the second bridge 202 is provided with a partition 9. The installation distance between the first bridge 201 and the second bridge 202 is not less than 5 cm. The low-voltage cable 6 is arranged on one side of the partition 9, and the control cable 7 and the communication cable 8 are arranged on the other side of the partition 9.

[0044] Furthermore, the height of the L-shaped connecting piece 101 is 30-35 cm.

[0045] Furthermore, the L-shaped connecting piece 101 and the bottom plate bracket 102 are both made of stainless steel.

[0046] Furthermore, the area where the high-voltage cable 5 passes through the deck 3 is set as a stainless steel deck with a thickness of not less than 0.6 cm.

[0047] Furthermore, the shape of the reserved hole in S1 is a rectangle.

[0048] Furthermore, the cable 4 is a flexible cable.

[0049] Furthermore, each cable 4 in the second bridge in S4 is tightly wrapped with fireproof tape, the wrapping height is 30-35 cm, and the gap between each cable 4 is tightly filled with silicone fireproof mud.

[0050] Working principle of the present invention:

[0051] like Figure 1-, a cable laying process for an offshore substation, wherein a high-voltage cable 5 is laid in the first bridge 201, a low-voltage cable 6 is laid in the second bridge 202 through one side of a partition plate 9, and a control cable 7 and a communication cable 8 are laid on the other side. The high-voltage cable 5 is laid in an independent bridge and kept 5 cm away from the low-voltage cable 6, the control cable 7 and the communication cable 8 to reduce electromagnetic interference and reduce mutual interference between circuits, thereby improving the performance stability of the substation. A fireproof blocking module 1 is provided at the hole where the cable 4 passes through the deck 3, in the bridge 2 where the cable 4 is provided, and in the hole where the cable 4 passes through the wall. First, before construction, the scattered debris, dust, oil stains, etc. in the fireproof blocking module 1 are cleaned to ensure that the fireproof blocking module 1 is dry and tidy, and then the bottom modeling of the longitudinal fireproof blocking module 1 without a bottom surface is performed at the hole reserved on the deck 3. The bottom modeling mainly involves fixing the L-shaped connecting piece 101 on the inner walls on both sides of the deck 3 through nuts, and then installing the bottom plate bracket 102 on the L-shaped connecting piece. 101, the insulation board is manually cut into insulation boards of corresponding sizes according to the size and shape of the fireproof plugging module 1 and installed on the bottom plate bracket 102 as a support for the main fireproof material. Then, the gaps between the insulation board and the cable 4 passing through the holes of the deck 3 and the gaps between the insulation board and the deck 3 are tightly pasted with fireproof tape, and then the self-flowing foaming plugging agent is poured on the fireproof plugging module 1 until it is flush with the surface of the deck 3. The self-flowing foaming plugging agent on the market is made of polypropylene glycol, a homogenizing agent, a catalyst, an isocyanate, and an expandable Expanded graphite powder and the like are uniformly stirred in a mixed ratio, and the foaming stops in half an hour at room temperature and can be touched by fingers; then, in each bridge frame 2 where cables 4 are arranged at intervals not greater than 20 meters, and in the holes where cables 4 pass through the wall, fireproof blocks 103 of corresponding sizes are manually cut according to the size and shape of the fireproof blocking module 1 and filled into the position of the fireproof blocking module 1. The fireproof blocks 103 here are an elastic material that can be cut into various shapes and have strong plasticity. They are used in the gaps between the fireproof blocks 103 and the cables 4, bridge frames 2 and walls. The fireproof sealant is filled densely and smoothed to achieve the effect of fireproof sealing, increase the weather resistance and water resistance of the sealing position, and at the same time increase the stability of its structure. Then, a high-density fireproof coating is applied on the surface of the fireproof block 103, and within 1 meter before and after each fireproof sealing module 1, a cable fireproof paint is applied, which greatly increases the safety. Finally, a protective steel plate is installed on the exposed surface of the fireproof sealing module 1 where the cable 4 passes through the deck hole, and then the bridge cover is installed, thereby ensuring that the sealing position is simple to operate, beautiful and safe.

[0052] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for laying cables in an offshore substation, comprising a fireproof blocking module (1), a bridge (2), a deck (3), a cable (4), Features: A fireproof blocking module (1) is provided at the hole where the cable (4) passes through the deck (3), in the bridge (2) where the cable (4) is provided, and in the hole where the cable (4) passes through the wall. The fireproof blocking module (1) comprises an L-shaped connecting piece (101), a bottom plate bracket (102), and a fireproof building block (103). The L-shaped connecting piece (101) is fixedly mounted on the inner walls of both sides of the deck (3) by nuts. The bottom plate bracket (102) is mounted on the L-shaped connecting piece (101). The bridge (2) comprises a first bridge (201) and a second bridge (202). The cable (4) comprises a high-voltage cable (5), a low-voltage cable (6), a control cable (7), and a communication cable (8). The first bridge (201) is provided with a high-voltage cable (5), and the second bridge (202) is provided with a low-voltage cable (6), a control cable (7), and a communication cable (8). The specific operation steps are as follows: S1: Before construction, clean up the debris, dust and oil stains scattered in the fireproof blocking module (1) to ensure that the fireproof blocking module (1) is dry and clean; S2: Modeling the bottom of the longitudinal fire blocking module (1) without a bottom surface at the hole reserved in the deck (3), manually cutting the insulation board into insulation boards of corresponding sizes according to the size and shape of the fire blocking module (1) and installing them on the bottom plate bracket (102) as support for the main fireproof material; the shape of the reserved hole is rectangular; S3: Then, use fireproof tape to seal the gaps between the insulation board and the cable (4) that penetrate the holes in the deck (3) and the gaps between the insulation board and the deck (3); S4: pouring a self-flowing foaming plugging agent into the fireproof plugging module (1) until it is flush with the surface of the deck (3), and the foaming stops at room temperature for half an hour and can be touched by fingers; in the second bridge (202) in S4, each cable (4) is tightly wrapped with a fireproof tape, the wrapping height is 30-35 cm, and the gap between each cable (4) is tightly filled with silicone fireproof mud; S5: Then, in each bridge (2) where the cable (4) is arranged at intervals not greater than 20 meters, and in the hole where the cable (4) passes through the wall, fireproof blocks (103) cut into corresponding sizes by hand according to the size and shape of the fireproof blocking module (1) are filled into the position of the fireproof blocking module (1), and the gaps between the fireproof blocks (103) and the cables (4), the bridge (2) and the wall are filled and smoothed with fireproof sealant, and then a high-density fireproof coating is applied on the surface of the fireproof blocks (103); S6: Then, apply cable fire retardant paint within 1 meter in front and behind each fire blocking module (1); S7: Finally, install a protective steel plate on the exposed surface of the fire blocking module (1) where the cable (4) passes through the deck hole, and then install the bridge cover.

2. A method for laying cables for an offshore substation according to claim 1, It is characterized in that The first bridge (201) is a galvanized trough bridge, the second bridge (202) is provided with a partition (9), the installation distance between the first bridge (201) and the second bridge (202) is not less than 5 cm, the low-voltage cable (6) is arranged on one side of the partition (9), and the control cable (7) and the communication cable (8) are arranged on the other side of the partition (9); The height of the L-shaped connecting piece (101) is 30-35 cm; The L-shaped connecting piece (101) and the bottom plate bracket (102) are both made of stainless steel.

3. A method for laying cables for an offshore booster station according to claim 1, It is characterized in that The area where the high-voltage cable (5) passes through the deck (3) is a stainless steel deck with a thickness of not less than 0.6 cm; and the cable (4) is a soft cable.

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