High-capacity multi-stage sedimentation tank for water-rich tunnel construction

Abstract

The utility model discloses a high-capacity multi-stage sedimentation tank for water-rich tunnel construction. The settling pond is of a reinforced concrete structure and comprises a rectangular settling pond body, a longitudinal partition wall in the length direction of the settling pond body and a plurality of transverse partition walls in the width direction of the settling pond body are arranged in the settling pond body, and the interior of the settling pond body is divided into a plurality of first settling cabins located in the middle and four second settling cabins located at the ends of the settling pond body; the size of the second precipitation cabins is smaller than that of the first precipitation cabins, drainage grooves are formed in the upper portions of the partition walls between the adjacent first precipitation cabins, waterproof insertion plates are inserted in the partition walls at the drainage grooves, and water inlet / outlet pipes are arranged on the cabin walls of the second precipitation cabins. Water pipes are arranged on a partition wall between every two adjacent second precipitation cabins and partition walls between the first precipitation cabins and the second precipitation cabins, two sewage disposal pipelines located on the two sides of the longitudinal partition wall respectively are arranged at the bottom of the inner side of the precipitation tank body, and the sewage disposal pipelines pass through the first precipitation cabins; a plurality of sewage disposal holes are formed in the sewage disposal pipeline in each first precipitation cabin.

Description

Technical Field

[0001] The utility model relates to a sedimentation tank for tunnel construction, in particular to a large-capacity multi-stage sedimentation tank for water-rich tunnel construction, belonging to the technical field of tunnel drainage. Background Art

[0002] During tunnel construction, tunnel sewage needs to be discharged from the tunnel in a timely manner. In order to protect the water resources and environment, some places stipulate that tunnel construction sewage must be treated by sewage treatment plants and can only be discharged after meeting the standards. Since tunnel sewage contains a large amount of impurities such as sediment, it is necessary to carry out multi-stage sedimentation before the sewage enters the sewage treatment station to reduce its sediment content and reduce the burden on the sewage treatment plant.

[0003] During the construction of water-rich tunnels, there are often problems such as large water inflow and high sediment content in the tunnel. At present, construction sewage discharged inside and outside the tunnel is mostly discharged directly into the river after simple multi-stage sedimentation. Since the drainage does not enter the sewage treatment plant, the sedimentation effect of the sedimentation tank is not required to be high. Therefore, the existing sewage sedimentation tanks mostly adopt a simple multi-stage series method to precipitate the silt. This simple series sedimentation tank has poor sedimentation effect. The excessive sediment content will bring great processing pressure to the sewage treatment plant. The sediment filtration equipment needs to be cleaned frequently, and the amount of sewage treatment chemicals added is large, which increases the relevant costs. In addition, the silt cleaning of the series sedimentation tank is inconvenient. If the sludge discharge system at the bottom of a sedimentation tank fails, the water cannot be stopped for maintenance alone. The water needs to be stopped as a whole, which affects the overall operation of the sedimentation tank. In addition, the existing series sedimentation tanks occupy a large area and have a small number of sedimentation stages. Utility Model Content

[0004] In view of the above-mentioned defects existing in the prior art, the utility model provides a large-capacity multi-stage sedimentation tank for water-rich tunnel construction which has a simple structure, small footprint, good sewage treatment effect, convenient sludge cleaning and can realize independent water shut-off maintenance of a certain compartment.

[0005] The utility model is realized through the following technical scheme: a large-capacity multi-stage sedimentation tank for water-rich tunnel construction, characterized in that: it is a reinforced concrete structure, including a rectangular sedimentation tank body, wherein the sedimentation tank body is provided with a longitudinal partition wall along its length direction and multiple transverse partition walls along its width direction, and the sedimentation tank body is divided into a plurality of first sedimentation tanks located in the middle and four second sedimentation tanks located at the ends of the sedimentation tank body, the size of the second sedimentation tank is smaller than that of the first sedimentation tank, and a U-shaped drainage groove is provided on the upper part of the partition wall between adjacent first sedimentation tanks, and the drainage groove is A water-proof plug plate is sealedly installed on the partition wall, an inlet / outlet water pipe is buried on the bulkhead of the second sedimentation tank located at the end of the sedimentation tank body, a water pipe connecting the two adjacent second sedimentation tanks is arranged on the partition wall between the two adjacent second sedimentation tanks, and at least one water pipe connecting the two is arranged on the partition wall between the first sedimentation tank and the second sedimentation tank, two sewage cleaning pipes are arranged on the inner bottom of the sedimentation tank body, the two sewage cleaning pipes are respectively located on both sides of the longitudinal partition wall, and the sewage cleaning pipes are arranged along the longitudinal direction of the sedimentation tank body and pass through each first sedimentation tank, and a number of sewage cleaning holes are arranged on the sewage cleaning pipe in each first sedimentation tank.

[0006] In the utility model, by arranging a water-blocking plug plate on the partition wall of the adjacent first sedimentation tank, the water flow direction in the sedimentation tank can be regulated by plugging and unplugging the water-blocking plug plate, so that the sewage sedimentation level can be regulated. When a sewage cleaning pipe in a first sedimentation tank fails and needs to be repaired, the water flow direction can be controlled by arranging a water-blocking plug plate, so that the first sedimentation tank can be isolated from the water, which is convenient for repairing the first sedimentation tank, and independent water-cutting maintenance is achieved without affecting the overall operation of the sedimentation tank. The second sedimentation tank arranged at the end of the sedimentation tank can slow down the water inlet flow rate, which is beneficial to improving the sludge sedimentation effect in the first sedimentation tank at the water inlet end. The sewage cleaning pipe arranged at the bottom of the inner side of the sedimentation tank body can pump out and clean the sludge in the first sedimentation tank through high-power pumping equipment, which facilitates the sludge cleaning.

[0007] Furthermore, in order to ensure the sealing of the water-blocking plug plate after insertion, a plug plate groove is provided on the partition wall at the drainage groove, and the water-blocking plug plate is inserted in the plug plate groove.

[0008] Furthermore, in order to improve the desilting effect, the sewage cleaning pipeline is arranged in a zigzag shape in each first sedimentation chamber.

[0009] Furthermore, the number of the first sedimentation tanks is eight.

[0010] Furthermore, the size of the sedimentation tank body is 40*14*4m; the size of the second sedimentation tank along the longitudinal direction of the sedimentation tank body is 1m; and the size of the drainage trough is 0.3*0.3m.

[0011] The beneficial effects of the utility model are as follows: the utility model has a simple structure, and changes the traditional series sedimentation tank into a parallel type, which reduces the floor space, increases the number of sedimentation stages, and improves the water treatment effect; by setting a pluggable water-blocking plug plate, the flow direction of sewage can be controlled, and the sewage sedimentation level can be regulated. Moreover, through the design of the water-blocking plug plate, once the mud discharge system at the bottom of a first sedimentation tank fails, the tank can be independently cut off for maintenance without affecting the overall operation of the sedimentation tank; by setting a small-sized second sedimentation tank at the end of the sedimentation tank, the sewage flow rate is effectively reduced, and the sludge sedimentation effect of the first first sedimentation tank at the water inlet end is improved; by setting a sewage cleaning pipeline at the bottom, it is convenient to clean the sedimentation sludge. The utility model improves the sedimentation effect of the sedimentation tank, reduces the sediment content at the outlet compared with the traditional sedimentation tank, and has a significant effect on reducing the sewage treatment cost of the sewage treatment plant. Water quality testing shows that the sediment content at the outlet is reduced from 1.2% in the previous period to 0.4%, and the sewage treatment cost is reduced from 1.8 yuan / cubic meter in the previous period to 1.2 yuan / cubic meter, which is effective. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model;

[0013] Figure 2 yes Figure 1 Schematic diagram from top view;

[0014] Figure 3 It is a schematic diagram of the drainage trough in the utility model;

[0015] Figure 4 It is a schematic diagram of the cooperation between the water-blocking plug plate and the plug plate groove in the utility model;

[0016] Figure 5 It is a water flow direction control diagram for temporary maintenance in the utility model;

[0017] In the figure, 1, sedimentation tank body, 2, first sedimentation chamber, 3, second sedimentation chamber, 4, sewage cleaning pipe, 5, water-blocking plug plate, 6, water pipe I, 7, water pipe II, 8, water inlet / outlet pipe, 9, longitudinal partition wall, 10, transverse partition wall, 11, drainage trough, 12, plug plate groove. DETAILED DESCRIPTION

[0018] The present invention is further described below by way of non-limiting embodiments and in conjunction with the accompanying drawings:

[0019] As shown in the attached drawings, a large-capacity multi-stage sedimentation tank for water-rich tunnel construction is a reinforced concrete structure, including a rectangular sedimentation tank body 1, the size of which is 40*14*4m (length*width*height). A longitudinal partition wall 9 along its length and multiple transverse partition walls 10 along its width are arranged in the sedimentation tank body 1. The longitudinal partition wall 9 and the transverse partition wall 10 divide the sedimentation tank body 1 into a plurality of first sedimentation tanks 2 located in the middle and four second sedimentation tanks 3 located at the ends of the sedimentation tank body. In this embodiment, there are four second sedimentation tanks 3 and eight first sedimentation tanks 2, wherein the size of the second sedimentation tank 3 is smaller than that of the first sedimentation tank 2, and the eight first sedimentation tanks 2 are the same size. In this embodiment, the size of the second sedimentation tank 3 along the longitudinal direction of the sedimentation tank body 1 is 1m, and the size of the second sedimentation tank 3 is 7*1*4m. The sedimentation tank wall uses C30 reinforced concrete with a thickness of 20cm. A U-shaped drainage ditch 11 is provided on the upper part of the longitudinal partition wall 9 and the transverse partition wall 10 between the adjacent first sedimentation chambers 2. The size of the drainage ditch is 0.3*0.3m. A water-blocking plug plate 5 is sealed and inserted on the partition wall at the drainage ditch 11, and the water-blocking plug plate 5 can be pulled out and inserted. In order to ensure the sealing after the water-blocking plug plate 5 is inserted, a plug plate groove 12 is provided on the partition wall at the drainage ditch 11, and the water-blocking plug plate 5 is inserted in the plug plate groove 12. In order to control the direction of water flow and ensure the sewage treatment effect, the drainage ditch 11 provided on the two transverse partition walls 10 of the first sedimentation chamber 2 is preferably arranged in a staggered manner. An inlet / outlet pipe 8 is buried on the bulkhead of the second sedimentation chamber 3 at the end of the sedimentation tank body 1 for water inlet or outlet. A water pipe Ⅱ7 connecting the two adjacent second sedimentation chambers 2 is provided on the longitudinal partition wall between the two adjacent second sedimentation chambers 2. The specifications of the water pipe Ⅱ7 are designed according to the water treatment volume. At least one water pipe Ⅰ6 is provided on the transverse partition wall between the first sedimentation tank 2 and the second sedimentation tank 3 to connect the two. The number and size of the water pipe Ⅰ6 can be designed according to the water treatment capacity. Two sewage cleaning pipes 4 are provided at the inner bottom of the sedimentation tank body. The two sewage cleaning pipes 4 are respectively located on both sides of the longitudinal partition wall 9, and the sewage cleaning pipes 4 are arranged along the longitudinal direction of the sedimentation tank body 1 and pass through each first sedimentation tank 2. A number of sewage cleaning holes are provided on the sewage cleaning pipes 4 in each first sedimentation tank 2. In order to improve the desilting effect, the sewage cleaning pipes 4 are arranged in a zigzag shape in each first sedimentation tank 2. Since the particle size of the sediment entering the sedimentation tank is small, the diameter of the sewage cleaning pipe is 15 cm, and a 2.5 cm diameter circular hole is provided in the annular direction as a sewage cleaning hole. The sewage cleaning holes are spaced 30 cm apart and arranged in a plum blossom shape. In order to improve the waterproof ability of the sedimentation tank, after the concrete reaches the design strength, a waterproof coating should be applied on the inner surface of the outer wall. The waterproof coating adopts a water-based polyurethane coating.

[0020] When the utility model is working, in order to realize reasonable control of the sewage flowing through the sedimentation tank, the water flow direction in the sedimentation tank is regulated by inserting and pulling out the water-blocking plug plate, so as to achieve the purpose of adjusting the sewage sedimentation level. When the amount of sludge deposited in the tank is large, a high-power silt extraction vehicle can be connected to the bottom sewage cleaning pipeline to realize efficient drainage of the sedimentation tank silt. If the sewage cleaning pipeline at the bottom of a first sedimentation tank 2 fails, the water-blocking plug plate can be set to realize water-cutting maintenance of the first sedimentation tank without affecting the overall operation of the sedimentation tank.

[0021] The other parts of this embodiment are all prior art and will not be described in detail here.

Claims

1. A large-capacity multi-stage sedimentation tank for water-rich tunnel construction, characterized by: It is a reinforced concrete structure, including a rectangular sedimentation tank body, wherein the sedimentation tank body is provided with a longitudinal partition wall along the length direction thereof and a plurality of transverse partition walls along the width direction thereof, dividing the sedimentation tank body into a plurality of first sedimentation tanks located in the middle and four second sedimentation tanks located at the ends of the sedimentation tank body, the size of the second sedimentation tank is smaller than the size of the first sedimentation tank, a U-shaped drainage groove is provided on the upper part of the partition wall between adjacent first sedimentation tanks, a water-blocking plug plate is sealed and inserted on the partition wall at the drainage groove, an inlet / outlet water pipe is buried on the bulkhead of the second sedimentation tank located at the end of the sedimentation tank body, a water pipe connecting the two adjacent second sedimentation tanks is provided on the partition wall between the two adjacent second sedimentation tanks, at least one water pipe connecting the two is provided on the partition wall between the first sedimentation tank and the second sedimentation tank, two sewage cleaning pipes are provided on the inner bottom of the sedimentation tank body, the two sewage cleaning pipes are respectively located on both sides of the longitudinal partition wall, and the sewage cleaning pipes are arranged along the longitudinal direction of the sedimentation tank body and pass through each first sedimentation tank, and a plurality of sewage cleaning holes are provided on the sewage cleaning pipe in each first sedimentation tank.

2. The large-capacity multi-stage sedimentation tank for water-rich tunnel construction according to claim 1 is characterized in that: A plug-in plate groove is arranged on the partition wall at the drainage groove, and the water-blocking plug-in plate is inserted into the plug-in plate groove.

3. The large-capacity multi-stage sedimentation tank for water-rich tunnel construction according to claim 1 or 2 is characterized in that: The sewage cleaning pipeline is arranged in a zigzag shape in each first sedimentation chamber.

4. The large-capacity multi-stage sedimentation tank for water-rich tunnel construction according to claim 3 is characterized by: There are eight first sedimentation tanks.

5. The large-capacity multi-stage sedimentation tank for water-rich tunnel construction according to claim 4 is characterized by: The size of the sedimentation tank body is 40*14*4m; the size of the second sedimentation tank along the longitudinal direction of the sedimentation tank body is 1m; the size of the drainage trough is 0.3*0.3m.

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