Cable well water stop cofferdam and dewatering system thereof

Abstract

The utility model belongs to the technical field of cable well construction, and particularly relates to a cable well water stop cofferdam and a dewatering system thereof. The cable well water stop cofferdam comprises a cylindrical fence formed by sequentially connecting a plurality of vertical plates in the horizontal direction, the axis of the cylindrical fence is arranged in the vertical direction, and every two adjacent vertical plates are connected in a sealed mode. A plurality of rigid straight pipes are fixedly arranged on the inner wall of the cylindrical fence, and the rigid straight pipes are uniformly distributed in the circumferential direction of the cylindrical fence; the rigid straight pipe comprises a reinforcing section and a filtering section which are adjacently arranged up and down, and a plurality of filtering holes are formed in the pipe wall of the filtering section; the lower end face of the filtering section is flush with the bottom face of the cylindrical fence. Water in a soil layer outside the foundation pit is prevented from entering a construction space, structures such as the submersible pump and a drainage pipe are protected, the structures such as the submersible pump are prevented from obstructing bottom plate construction, and construction safety and working reliability of the submersible pump are guaranteed; the rigidity and strength of the cylindrical fence are enhanced, construction safety is guaranteed, and the cylindrical fence can be repeatedly used and is environmentally friendly.

Description

TECHNICAL FIELD

[0001] The utility model belongs to cable well construction technical field, concretely relates to a cable well water stop cofferdam and its dewatering system. BACKGROUND

[0002] As the infrastructure to guarantee the normal operation of the airport equipment, the cable well is mainly used for accommodating, installing and protecting the cable, facilitating the maintenance of the cable and improving the safety and reliability and the appearance of the power supply system of the airport.

[0003] The common cross section of the airport cable well is a rectangular structure with a length of 4m and a width of 4m, and the depth is generally 4m. During the construction of the cable well, the water stop steel plate is installed on the side wall of the foundation pit after the foundation pit is dug and set, and the water stop steel plate is sequentially spliced on the side wall of the foundation pit along the circumference of the foundation pit to reduce the water in the soil outside the foundation pit from seeping into the foundation pit along the side wall of the foundation pit. In order to reduce the accumulated water in the foundation pit and guarantee the smooth construction, a water collecting pit is generally opened at the bottom of the foundation pit. The water at the bottom of the foundation pit is collected into the water collecting pit and then pumped out by the water pump to keep the bottom of the foundation pit at a low water level, thereby guaranteeing the smooth construction of the cable well.

[0004] The above-mentioned scheme is only limited to the construction of the cable well with less water content soil layer, but it is not suitable for the coastal areas with high underground water level. The underground of the coastal area is generally sandy soil layer, which is rich in water content and loose. Especially when the airport cable well is built in some reclamation areas, the water can be seen in the foundation pit with a depth of less than 2m, and the water flow is large. The water body at the bottom of the foundation pit also continuously penetrates into the foundation pit, resulting in a high water level in the foundation pit. After the foundation pit is dug and set, the water depth in the interior of the foundation pit can reach 2m. In order to ensure that the water level in the cable well meets the construction requirements, a plurality of submersible pumps need to be arranged at the bottom of the foundation pit for water pumping and drainage operation. A person needs to be arranged on site for a long time to monitor the water level of the foundation pit and the working condition of the water pump to avoid the occurrence of the water pump burning, the mud and sand wrapped in the water entering the submersible pump and other accidents, which affect the dewatering efficiency. During the construction process of the bottom plate of the cable well, the structures such as the formwork and the reinforcement cage should also be avoided from interfering with the structures such as the plurality of water pumps, the water pump wires and the drainage pipes at the bottom of the pit. In addition, the recovery of the structures such as the water pump after the construction of the bottom plate needs to be considered. The construction is complicated, the manpower is wasted and the cost is high. In addition, the water stop effect of the water stop steel plate arranged on the side wall of the foundation pit is very small, and the phenomenon such as piping, flowing sand and the like is easy to occur under the action of the large penetration force of the underground water, which damages the foundation pit slope and the pit wall maintenance structure and brings hidden dangers to the construction safety. UTILITY MODEL CONTENTS

[0005] The technical problem to be solved by the utility model is to provide a cable well water stop cofferdam and its dewatering system, improve the reliability of the foundation pit slope and the pit wall maintenance structure of the cable well, facilitate the construction of the foundation pit bottom plate and guarantee the construction safety.

[0006] The utility model discloses a technical scheme that solves the technical problem is as follows: a cable well water stop cofferdam, including the vertical plate of being arranged perpendicularly to the horizontal plane, the vertical plate is provided with multiple pieces, multiple vertical plate is connected in sequence and forms the cylindrical enclosure along the horizontal direction, the axis of cylindrical enclosure is arranged along the up-down direction, and the sealing connection is arranged between two adjacent vertical plate,

[0007] The inner wall of the cylindrical enclosure is fixed with a rigid straight pipe arranged along the up-down direction, and the lumen of the rigid straight pipe is used for accommodating a submersible pump; the rigid straight pipe is provided with multiple pieces, and the multiple rigid straight pipes are uniformly distributed along the circumference of the cylindrical enclosure;

[0008] The rigid straight pipe comprises a reinforcing section and a filtering section arranged adjacently, and a plurality of filter holes are arranged on the pipe wall of the filtering section; the lower end surface of the filtering section is flush with the bottom surface of the cylindrical enclosure.

[0009] Further, the inner contour of the cross section of the cylindrical enclosure is a rectangular structure, the vertical plate is a rectangular plate structure, and a plurality of rigid straight pipes are arranged on the inner side surface of the single vertical plate.

[0010] Further, the rigid straight pipes are arranged at the four corners of the inner side of the cylindrical enclosure.

[0011] Further, a lifting ring is fixedly arranged on the upper end of the vertical plate.

[0012] Further, the vertical plate is a steel plate structure, and the adjacent vertical plates are sealingly welded.

[0013] Further, the rigid straight pipe is a rectangular steel pipe, and the rectangular steel pipe is welded on the vertical plate.

[0014] Further, a filter screen is coated on the outer wall of the filtering section, and the filter holes on the filter screen are smaller than the filter holes on the filtering section.

[0015] A dewatering system comprising the cable well water stop cofferdam of any one of the above-mentioned embodiments, comprising a foundation pit, wherein the water stop cofferdam is located in the foundation pit, and the bottom surface of the water stop cofferdam abuts against the bottom surface of the foundation pit.

[0016] The lumen bottom of the rigid straight pipe on the water stop cofferdam is provided with a submersible pump, the water outlet of the submersible pump is connected with a drain pipe, and the upper end of the drain pipe is located outside the foundation pit.

[0017] Further, a controller, a switch and a water level sensor fixedly installed on the inner wall of the filtering section are further included; the switch is used for controlling the start and stop of the submersible pump, and the water level sensor is used for monitoring the water level height in the lumen of the filtering section.

[0018] The switch and the water level sensor are connected with the controller through wires respectively, and the submersible pump and the switch are connected through wires.

[0019] Compared with the prior art, the utility model has the advantages that: the water-stopping cofferdam of cable well is provided, the water body in the soil layer outside the foundation pit is avoided from entering the construction space by setting the cylindrical enclosure, the rigid straight pipes are arranged on the inner wall of the cylindrical enclosure to accommodate the submersible pump, the wires and the drainage pipes and the like, the submersible pump and the wires and the drainage pipes and the like are protected, the submersible pump and the like are distributed on the outer periphery of the construction space, the submersible pump and the like are avoided from hindering the bottom plate construction, the construction safety and the working reliability of the submersible pump are ensured, and the drainage efficiency is improved; the rigidity and the strength of the cylindrical enclosure are further enhanced by the plurality of rigid straight pipes, the supporting force on the side wall of the foundation pit is enhanced, the side wall of the foundation pit is avoided from collapsing and impacting the cylindrical enclosure to cause damage or even safety accidents, and the safety of the bottom plate construction of the foundation pit is further ensured.

[0020] The utility model provides a dewatering system with the water-stopping cofferdam of cable well, reduces the water level of the central position of the construction space, and facilitates construction; the controller, the water level sensor connected with the controller and the switch connected with the controller and the submersible pump are arranged, so that the submersible pump is controlled to start and stop according to the water level height range in the rigid straight pipe, manpower and cost are saved, and construction risks are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is the axial side structure schematic diagram of an embodiment of the water-stopping cofferdam in the utility model;

[0022] Figure 2 is Figure 1 the overhead structure schematic diagram of

[0023] Figure 3 is the structure schematic diagram of an embodiment of the rigid straight pipe in the utility model;

[0024] Figure 4 is the structure schematic diagram of the water-stopping cofferdam in the utility model installed in the foundation pit;

[0025] Figure 5 is the overhead structure schematic diagram in the cable well construction in the utility model;

[0026] Figure 6 is Figure 5 the enlarged structure schematic diagram of B part in

[0027] Figure 7 is Figure 5 the sectional structure schematic diagram along the section line A-A;

[0028] Reference signs: 1 - water stop steel plate; 2 - steel pipe; 21 - reinforcing section; 22 - filter section; 23 - filter hole; 3 - foundation pit; 4 - construction space; 5 - submersible pump; 51 - drain pipe; 61 - controller; 62 - switch; 63 - water level sensor. DETAILED DESCRIPTION

[0029] The utility model is further illustrated below in combination with the drawings and examples. The examples described below by referring to the drawings are exemplary and are only used for explaining the utility model and cannot be understood as limiting the utility model.

[0030] As shown in the accompanying drawings Figures 1-7 A cable well water stop cofferdam, comprising vertical plates 1 arranged perpendicular to the horizontal plane, the vertical plates 1 are provided with multiple; multiple vertical plates 1 are sequentially connected in the horizontal direction to form a cylindrical enclosure, the axis of the cylindrical enclosure is arranged in the up-down direction, and the adjacent two vertical plates 1 are sealingly connected; a rigid straight pipe 2 with the axis arranged in the up-down direction is fixedly arranged on the inner wall of the cylindrical enclosure, the lumen of the rigid straight pipe 2 is used for accommodating a submersible pump 5; the rigid straight pipe 2 is provided with multiple, multiple rigid straight pipes 2 are uniformly distributed in the circumferential direction of the cylindrical enclosure; the rigid straight pipe 2 comprises reinforcing sections 21 and filter sections 22 arranged adjacently in the up-down direction, multiple filter holes 23 are arranged on the pipe wall of the filter section 22; the lower end surface of the filter section 22 is flush with the bottom surface of the cylindrical enclosure.

[0031] As Figure 7As shown, after the foundation pit 3 is excavated, the cofferdam is hoisted into the foundation pit 3 to fix the cofferdam on the bottom of the foundation pit 3, the lower end surface of the cylindrical enclosure abuts against the bottom surface of the foundation pit 3, and the end of the filter section 22 away from the reinforcing section 21 abuts against the bottom surface of the foundation pit 3. The space inside the cylindrical enclosure is the construction space 4 of the cable well bottom plate, and the cylindrical enclosure is used to prevent the soil, quicksand and water on the side wall of the foundation pit from entering the construction space 4. The submersible pump 5 is placed at the bottom of the lumen of the rigid straight pipe 2, the water outlet of the submersible pump 5 is connected with the drain pipe 51, the lower part of the drain pipe 51 is located in the lumen of the rigid straight pipe 2, and the upper end of the drain pipe 51 is located outside the foundation pit 3. The rigid straight pipe 2 is used to protect the submersible pump 5 and the wires, the drain pipe 51 and other structures inside the rigid straight pipe 2, and to distribute the submersible pump 5 and other structures around the outer periphery of the construction space 4, so as to avoid the submersible pump 5 and other structures from interfering with the bottom plate construction and from being touched by mistake by the construction personnel, thereby ensuring the construction safety and the working reliability of the submersible pump 5 and improving the construction efficiency. Meanwhile, the plurality of rigid straight pipes 2 also enhance the rigidity and strength of the cylindrical enclosure, and enhance the support of the side wall of the foundation pit, so as to avoid the pipe heave, quicksand and other phenomena from causing the side wall of the foundation pit to collapse and hit the cylindrical enclosure, thereby improving the construction safety. When the foundation pit is drained, the water in the construction space 4 passes through the filter holes 23 and enters the lumen of the rigid straight pipe 2 and passes the submersible pump 5, the submersible pump 5 is started, the submersible pump 5 pumps the water in the foundation pit into the drain pipe 51, the drain pipe 51 drains the water outside the foundation pit to realize the drainage operation of the construction space 4. After the bottom plate construction of the foundation pit 3 is completed, the entire cofferdam is hoisted out for recycling. The cofferdam of the utility model can be repeatedly used, and is green and environmentally friendly.

[0032] The outer contour of the cross section of the cylindrical enclosure can be any shape, such as a circular, triangular, rectangular structure, or an irregular shape formed by a plurality of arc segments. The cross section of the cable well is generally rectangular. In consideration of the convenience of material selection and processing and manufacturing of the cylindrical enclosure, preferably, the inner contour of the cross section of the cylindrical enclosure is a rectangular structure, and the stand plate 1 is a rectangular plate structure. A plurality of rigid straight pipes 2 are arranged on the inner side surface of the single stand plate 1, so as to further enhance the rigidity and strength of the cylindrical enclosure. A reinforcing rib perpendicular to the rigid straight pipe 2 can also be arranged on the inner side surface of the cylindrical enclosure. The reinforcing rib can be a steel plate, a steel pipe or an angle steel structure. The two ends of the reinforcing rib are preferably connected to the side surfaces of the two adjacent rigid straight pipes 2, so as to further enhance the strength of the cylindrical enclosure and make it safer and more reliable. As a further preferred embodiment, the rigid straight pipes 2 are arranged at the four corners of the inner side of the cylindrical enclosure, so as to enhance the connection strength between the two adjacent stand plates 1. As a further preferred embodiment, the upper end of the stand plate 1 is fixedly provided with a lifting ring 7, so as to facilitate hoisting. The lifting ring can be a commercially available lifting ring bolt or a hook.

[0033] The vertical plate 1 is a rigid structure, and the surface of the vertical plate 1 located inside the cylindrical enclosure can be a plane or a curved surface. The vertical plate 1 can be made of rigid PVC plate, aluminum plate or steel plate, etc. Considering the rigidity and strength of the steel plate are larger and the cost is lower, preferably, the vertical plate 1 is a steel plate structure, the adjacent vertical plates 1 are sealingly welded, which saves cost, facilitates connection and has large connection strength, and facilitates hoisting. Of course, the adjacent vertical plates 1 can also be fixedly connected through bolts, etc., and the joint between the two adjacent vertical plates 1 is filled with sealing glue to achieve sealing connection.

[0034] The rigid straight pipe 2 can be a circular pipe, a square pipe or a pipe structure with any other arbitrary cross-sectional shape, and can be a standard purchased part or a self-made sheet metal part. The rigid straight pipe 2 can be a PVC pipe, a steel pipe or other rigid material pipe structure. As a further preferred, the rigid straight pipe 2 is a rectangular steel pipe, which is welded on the vertical plate 1. Compared with other pipe materials, the rectangular steel pipe is easy to purchase and process, and the rigidity and strength of the steel pipe are larger, which further improves the strength of the cylindrical enclosure and saves production cost.

[0035] The reinforcing section 21 has larger strength than the filtering section 22. Generally, the length of the filtering section 22 is more than 0.6 m. The filtering section 22 is used to filter large sand and soil blocks and keep them outside the rigid straight pipe 2, so that the water in the working space 4 enters the lumen of the filtering section 22 through the filtering holes 23. The filtering holes 23 can be round holes, square holes or any other shape of hole structure. Preferably, the outer wall of the filtering section 22 is coated with a filter screen, and the filter screen is generally made of a dense mesh filter screen. The filter holes on the filter screen are smaller than the filtering holes 23 on the filtering section 22, so that part of the small sand and soil blocks are intercepted outside the lumen of the filtering section 22. In this way, the small sand and soil blocks are prevented from accumulating in the lumen of the filtering section 22 to block the water inlet of the submersible pump 5 and affect the drainage efficiency, and the submersible pump 5 is prevented from being damaged by too small water flow. The filter screen can be fixed on the filtering section 22 by screws or straps.

[0036] The dewatering system with any of the above cable well water-stopping cofferdams comprises a foundation pit 3, the water-stopping cofferdam is located in the foundation pit 3, and the bottom surface of the water-stopping cofferdam abuts against the bottom surface of the foundation pit 3; the lumen bottom of the rigid straight pipe 2 on the water-stopping cofferdam is provided with a submersible pump 5, the water outlet of the submersible pump 5 is connected with a drain pipe 51, and the upper end of the drain pipe 51 is located outside the foundation pit 3. The water-stopping cofferdam supports the side wall of the foundation pit 3 and ensures the safety of the construction environment of the inside construction space 4. At the same time, the water in the construction space 4 is filtered through the filtering holes 23 on the rigid straight pipe 2 to remove large sand and soil blocks and other impurities, and then enters the lumen of the rigid straight pipe 2. The multiple submersible pumps 5 pump the water in the rigid straight pipe 2 into the drain pipe 51 to be discharged, thereby lowering the water level of the construction space 43. The water discharged through the drain pipe 51 can be treated and then discharged into the municipal pipe network, or can be discharged into a water storage tank for secondary use after sedimentation and purification.

[0037] Preferably, the controller 61, the switch 62 and the water level sensor 63 fixedly installed on the inner wall of the filter section 22 are further included; the switch 62 is used for controlling the start and stop of the submersible pump 5, and the water level sensor 63 is used for monitoring the water level in the lumen of the filter section 22; the switch 62 and the water level sensor 63 are connected with the controller 61 through wires respectively, and the submersible pump 5 and the switch 62 are connected through wires. The water level sensor 63 transmits the monitored water level signal to the controller 61, when the water level signal received by the controller 61 is lower than the warning water level value, the controller 61 controls the switch 62 to be closed to make the switch 62 control the submersible pump 5 to stop pumping, so as to avoid that the submersible pump 5 is burnt out due to the too low water level; when the water level signal received by the controller 61 is higher than the warning water level value, the controller controls the switch 62 to be opened to make the switch 62 control the submersible pump 5 to start pumping, so as to avoid that the too high water level affects the cable well construction. When the water level signal received by the controller 61 is lower than the warning water level value, the switch 62 is controlled to make the switch 62 control the submersible pump 5 to stop pumping, so as to avoid that the submersible pump 5 is burnt out due to the too low water level; the construction site of the structure does not need to manually monitor the water level and the working condition of the pump for a long time, and the manpower and construction cost are saved. The controller 61 can be a single-chip microcomputer, an industrial computer or the like. The switch 62 and the water level sensor 63 can also be connected with the controller 61 through a wireless network or Bluetooth.

[0038] The embodiments of the specific implementation are the preferred embodiments of the utility model, and are not limited to the protection scope of the utility model, so that: equivalent changes made according to the structure, shape and principle of the utility model should be covered in the protection scope of the utility model.

Claims

1. A water-tight cofferdam for a cable shaft, comprising a vertical panel (1) arranged perpendicular to the horizontal plane, said vertical panel (1) being provided with a plurality of; characterized in that: A plurality of the vertical plates (1) are sequentially connected in horizontal direction to form a cylindrical enclosure, an axis of the cylindrical enclosure is arranged in up-down direction, and adjacent two of the vertical plates (1) are sealingly connected; A plurality of rigid straight pipes (2) are fixedly arranged on an inner wall of the cylindrical enclosure, an axis of the rigid straight pipes (2) is arranged in up-down direction, and a pipe cavity of the rigid straight pipe (2) is used to accommodate a submersible pump (5); the rigid straight pipe (2) is provided with a plurality of rigid straight pipes (2), and the plurality of rigid straight pipes (2) are uniformly distributed in a circumferential direction of the cylindrical enclosure; The rigid straight pipe (2) comprises a reinforcing section (21) and a filtering section (22) arranged in up-down direction, a plurality of filter holes (23) are arranged on a pipe wall of the filtering section (22), and a lower end surface of the filtering section (22) is flush with a bottom surface of the cylindrical enclosure.

2. The cable pit waterstop diaphragm of claim 1, wherein: An inner contour of a cross section of the cylindrical enclosure is a rectangular structure, the vertical plate (1) is a rectangular plate structure, and a plurality of rigid straight pipes (2) are arranged on an inner side of a single vertical plate (1).

3. The cable pit waterstop diaphragm of claim 2, wherein: The rigid straight pipe (2) is arranged at four corners of an inner side of the cylindrical enclosure.

4. The cable pit waterstop diaphragm of claim 3, wherein: A lifting ring (7) is fixedly arranged on an upper end of the vertical plate (1).

5. The cable pit waterstop dike of claim 1, wherein: The vertical plate (1) is a steel plate structure, and adjacent vertical plates (1) are sealingly welded.

6. The cable pit waterstop dike of claim 1, wherein: The rigid straight pipe (2) is a rectangular steel pipe, and the rectangular steel pipe is welded on the vertical plate (1).

7. The cable pit waterstop dike of claim 1, wherein: A filter screen is coated on an outer wall of the filtering section (22), and filter holes on the filter screen are smaller than the filter holes (23) on the filtering section (22).

8. A cable well dewatering system with a cable well water stop cofferdam according to any one of claims 1 to 7, comprising a foundation pit (3), characterized in that: The water stop cofferdam is located in the foundation pit (3), and a bottom surface of the water stop cofferdam abuts against a bottom surface of the foundation pit (3); A pipe cavity bottom of the rigid straight pipe (2) on the water stop cofferdam is provided with the submersible pump (5), a water outlet of the submersible pump (5) is communicated with a drain pipe (51), and an upper end of the drain pipe (51) is located on an outer side of the foundation pit (3).

9. The cable shaft dewatering system of claim 8, wherein: Further comprising a controller (61), a switch (62), and a water level sensor (63) fixedly installed on an inner wall of the filtering section (22); the switch (62) is used to control start and stop of the submersible pump (5), and the water level sensor (63) is used to monitor a water level height in a pipe cavity of the filtering section (22); The switch (62) and the water level sensor (63) are respectively connected with the controller (61) through wires, and the submersible pump (5) and the switch (62) are connected through wires.

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