Subway tunnel shield and bridge construction waste soil treatment and utilization system

Abstract

The invention relates to the technical field of construction waste soil utilization, in particular to a subway tunnel shield and bridge construction waste soil treatment and utilization system which comprises a feeding and screening module, a flocculation module, a sand washing module, a filter pressing module, a recycling module and a conveying module which are connected with one another to form a recycling system. The feeding and screening module is used for feeding waste soil and screening dust, gravel and large-particle waste soil in the waste soil. The sand washing module is used for carrying out friction cleaning on the screened sand and gravel to clean dirt; the flocculation module is used for carrying out flocculation and sedimentation on the slurry overflowing from the sand washing module to prepare for filter pressing. The waste soil is divided into three parts to be treated, the treated waste soil can be applied to the field of building construction, the field of landscaping, the field of water conservancy projects and the field of agriculture, the overall resource utilization rate of building waste is greatly increased, the waste soil is secondarily recycled, and waste of waste soil resources is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of construction waste soil utilization, and specifically relates to a subway tunnel shield and bridge construction waste soil treatment and utilization system. Background Art

[0002] Shield slag is the waste soil and rock fragments generated by the shield machine during the construction process. A large amount of waste soil is also generated during bridge construction. The domestic method of dealing with waste soil is generally landfilling, which is to bury the waste soil in another piece of land. However, this treatment method has certain disadvantages. For example, it will cause pollution to groundwater and soil. In addition, the direct landfill treatment method causes a large amount of waste soil waste, and the resource utilization rate is low. The waste soil cannot be recycled for a second time, resulting in a waste of waste soil resources. In this regard, we have proposed a subway tunnel shield and bridge construction waste soil treatment and utilization system. Summary of the invention

[0003] In view of the deficiencies of the prior art, the present invention provides a subway tunnel shield and bridge construction waste soil treatment and utilization system to solve the above technical problems.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a system for treating and utilizing waste soil from subway tunnel shield and bridge construction, the system comprising: a feeding and screening module, a flocculation module, a sand washing module, a filter press module, a recovery module and a conveying module, each group of modules being interconnected to form a recovery and utilization system;

[0005] The feeding and screening module is used to feed the waste soil and screen the dust, sand and gravel and large particles of waste soil in the waste soil;

[0006] The sand washing module is used to frictionally clean the screened sand and gravel to remove dirt;

[0007] The flocculation module is used to flocculate and precipitate the sludge overflowing from the sand washing module in preparation for filter pressing;

[0008] The filter press module is used to filter the flocculated mud and press it into mud cake for recovery;

[0009] The recovery module is used to recycle the pressed mud cake, filtered dust and cleaned sand and gravel;

[0010] The conveying module is used to transport the waste soil to be processed and transport it between various modules for processing.

[0011] Preferably, the feeding and screening module equipment is an excavator and a thin oil vibrating screen, the waste soil is fed by the excavator, the waste soil is sent to the top of the thin oil vibrating screen, and the waste soil is screened by the thin oil vibrating screen; the thin oil vibrating screen includes a screen box, a vibrator, a supporting device, a motor and a transmission device, wherein the motor drives the main shaft of the vibrator to rotate through the transmission device, and the screen box area is vibrated under the action of the vibrator, and the excavator transports the waste soil to the screen box, and the waste soil is screened by vibration, and the waste soil with small particle size passes through the screen, while the waste soil with large particle size is screened out, and the screened waste soil is transported and processed through the conveying module, and the small particle waste soil is recovered through the recovery module.

[0012] Preferably, large particles of waste soil are transported to the sand washing module through the conveying module for cleaning, wherein the large particles of waste soil contain sand and dust agglomerated with water. The sand washing module equipment is a spiral sand washing machine. The screened waste soil is transported through the conveying module and transported to the spiral sand washing machine for treatment. The spiral sand washing machine includes a weir plate, a shell, a spiral body, a reducer and a motor. The spiral sand washing machine cleans large particles of waste soil based on centrifugal force. The cleaned sand and gravel are taken away by the blades in the spiral sand washing machine and poured into the discharge trough to complete the cleaning. The liquid after cleaning forms muddy water, which is transported to the flocculation module for treatment.

[0013] Preferably, the recovery module recovers the treated waste soil through a collection box and transports the treated waste soil through a truck for secondary utilization.

[0014] Preferably, the equipment used in the conveying module is a belt conveyor, which includes a frame, a conveyor belt, rollers, a roller, a tensioning device and a transmission device. The transmission principle is based on the friction between the transmission roller and the belt. The waste soil is placed on the belt for transmission and transported to various processing modules for processing.

[0015] Preferably, the flocculation module uses a flocculation tank as a device for storing mud water. The slurry inlet mode on the top of the flocculation tank adopts a spiral feed trough. The mud water is poured into the flocculation tank through the feed trough for flocculation, and a flocculant is poured into the flocculation tank for flocculation. The flocculation tank has a diameter of 9m and a height of 13m. It includes a flow current detector to monitor the flocculation situation in the flocculation tank. The coagulation effect is indirectly reflected by measuring and controlling the current generated between the two electrodes in the sampling chamber by the charged ions or particles in the chemically treated water sample.

[0016] Preferably, after flocculation is completed, the clean water on the top of the flocculation module is discharged, leaving the muddy water containing mud at the bottom, and the muddy water at the bottom is transported to the inside of the filter press module for pressing treatment.

[0017] Preferably, the equipment used in the filter press module is a plate and frame filter press. The filter press module is composed of plates and frames arranged alternately, and also includes a filter plate covered with filter cloth. The plate and the frame are pressed tightly to form a filter press chamber between the plate and the frame. A small hole is opened in the middle of the upper end of the plate and the frame, which becomes a channel after pressing. The sludge pressurized to 0.2-0.4MPa enters the filter press chamber through the channel. The surface of the filter plate is engraved with grooves, and the lower end is drilled with a hole for the discharge of the filtrate. The filtrate is discharged under pressure to dehydrate the sludge and form a mud cake.

[0018] Preferably, the pressed mud cake is used in roadbed filling, agricultural applications and landscaping. In agricultural applications, the mud cake is used as a soil conditioner to increase the fertility of soil organic matter after fermentation and maturation. When used in landscaping, it is used as a compost material for vegetation growth.

[0019] Preferably, the filtered dust is used as an auxiliary material in construction, and is filled into the interior of building materials as an additive material, while the cleaned sand and gravel are used in the construction industry and water conservancy projects. In the construction industry, it is used as one of the manufacturing components of concrete, and in water conservancy projects, it is used as a material for dam construction and dam construction.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] This application uses a complete set of system processes to process the waste soil generated in subway tunnel shield and bridge construction, and divides the waste soil into three materials for treatment. The treated waste soil can be used in the fields of construction, landscaping, water conservancy projects and agriculture, which greatly improves the overall resource utilization rate of construction waste, recycles the waste soil for a second time, and avoids the waste of waste soil resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural framework diagram of the waste soil treatment and utilization system of the present invention. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] The present invention provides a technical solution: a system for treating and utilizing waste soil from subway tunnel shield and bridge construction, the system comprising: a feeding and screening module, a flocculation module, a sand washing module, a filter pressing module, a recovery module and a conveying module, each group of modules being interconnected to form a recovery and utilization system;

[0025] The feeding and screening module is used to feed the waste soil and screen the dust, sand and gravel and large particles of waste soil in the waste soil;

[0026] The sand washing module is used to frictionally clean the screened sand and gravel to remove dirt;

[0027] The flocculation module is used to flocculate and precipitate the sludge overflowing from the sand washing module in preparation for filter pressing;

[0028] The filter press module is used to filter the flocculated mud and press it into mud cake for recovery;

[0029] The recovery module is used to recycle the pressed mud cake, filtered dust and cleaned sand and gravel;

[0030] The conveying module is used to transport the waste soil to be processed and transport it between various modules for processing.

[0031] This solution achieves the recycling of waste soil by interconnecting modules. Through modular design and technical optimization, the system aims to achieve efficient treatment and resource utilization of waste soil and promote sustainable development.

[0032] Furthermore, the feeding and screening module equipment is an excavator and a thin oil vibrating screen. The waste soil is fed by the excavator and sent to the top of the thin oil vibrating screen, and the waste soil is screened by the thin oil vibrating screen; the thin oil vibrating screen includes a screen box, a vibrator, a supporting device, a motor and a transmission device, wherein the motor drives the main shaft of the vibrator to rotate through the transmission device, and the screen box area is vibrated under the action of the vibrator, and the excavator transports the waste soil to the screen box, and the waste soil is screened by vibration. The waste soil with small particle size passes through the screen, while the waste soil with large particle size is screened out, and the screened waste soil is transported and processed through the conveying module, and the small particle waste soil is recovered through the recovery module.

[0033] This solution uses block eccentricity as the exciting force, which has strong exciting force. The screen box uses high-strength bolts, has a simple structure, and is easy and quick to maintain. It uses a tire coupling, flexible connection, and stable operation. It adopts a small amplitude, high frequency, and large inclination structure, which makes the machine have high screening efficiency, maximum processing, long life, low power consumption, and low noise. The strong vibration generated by the vibrator of the thin oil vibrating screen can effectively and quickly separate different particle sizes in the waste soil. This efficient screening capability ensures the continuity and stability of the screening process and improves work efficiency. Small particles of waste soil often contain certain useful components or can be used as specific industrial raw materials. Through the fine screening of the thin oil vibrating screen, these small particles of waste soil can be effectively recycled, realizing the reuse of resources and reducing resource waste.

[0034] Furthermore, large particles of waste soil are transported to the sand washing module through the conveying module for cleaning, wherein the large particles of waste soil contain sand and dust agglomerated with water. The sand washing module equipment is a spiral sand washing machine. The screened waste soil is transported through the conveying module and transported to the spiral sand washing machine for treatment. The spiral sand washing machine includes a weir plate, a shell, a spiral body, a reducer and a motor. The spiral sand washing machine cleans large particles of waste soil based on centrifugal force. The cleaned sand and gravel are taken away by the blades in the spiral sand washing machine and poured into the discharge trough to complete the cleaning. The liquid after cleaning forms muddy water, which is transported to the flocculation module for treatment.

[0035] The spiral sand washing machine of this scheme has low power consumption and high cleaning degree; good sealing structure, fully blocked transmission installation and adjustable weir plate ensure that the product is high energy and durable, with good cleaning and dehydration effects, very stable operation process, and stable fine-grained products. It uses the principle of centrifugal force to efficiently clean large particles of sand and gravel in waste soil, remove soil and impurities attached to the surface of sand and gravel, and improve the cleanliness and quality of sand and gravel. This efficient cleaning ability helps to reduce impurity interference in subsequent processing and use, and improve product quality. The useful components of sand and gravel in the waste soil are effectively recovered, and the solid particles in the mud water are also converted into processable mud cakes. This resource recycling method helps to reduce resource waste, reduce processing costs, and conform to the concept of sustainable development.

[0036] Furthermore, the recycling module recycles the processed waste soil through a collection box and transports the processed waste soil through a truck for secondary utilization.

[0037] The recycling and reuse of waste soil in this solution reduces the amount of waste that needs to be landfilled or incinerated, thereby reducing pollution to the environment.

[0038] Furthermore, the equipment used in the conveying module is a belt conveyor, which includes a frame, a conveyor belt, rollers, a roller, a tensioning device and a transmission device. The transmission principle is based on the friction between the transmission roller and the belt. The waste soil is placed on the belt for transmission and transported to various processing modules for processing.

[0039] The belt conveyor adopted in this scheme can continuously and stably transport waste soil without being restricted by the transport distance and transport volume, thus improving the efficiency of waste soil treatment.

[0040] Furthermore, the flocculation module uses a flocculation tank as a device for storing muddy water. The slurry inlet mode on the top of the flocculation tank adopts a spiral feeding trough. The muddy water is poured into the flocculation tank through the feeding trough for flocculation, and flocculant is poured for flocculation. The flocculation tank has a diameter of 9m and a height of 13m. It includes a flow current detector to monitor the flocculation situation in the flocculation tank. The coagulation effect is indirectly reflected by measuring and controlling the current generated between the two electrodes in the sampling chamber by the charged ions or particles in the chemically treated water sample.

[0041] This solution uses a spiral feed chute to guide the mud water into the flocculation tank along a specific path, which helps to evenly distribute the mud water in the tank, thereby increasing the contact area with the flocculant and improving the mixing uniformity. Compared with direct pouring, the spiral feed chute can slow down the speed at which the mud water enters the tank and reduce the impact on the liquid in the flocculation tank.

[0042] Furthermore, after the flocculation is completed, the clean water on the top of the flocculation module is discharged, leaving the muddy water containing mud at the bottom, and the muddy water at the bottom is transported to the inside of the filter press module for pressing treatment.

[0043] The mud cake produced by the filtration in this scheme can be further processed or recycled, such as as a building material or soil conditioner, thus realizing the recycling of resources.

[0044] Furthermore, the equipment used in the filter press module is a plate and frame filter press. The filter press module is composed of plates and frames arranged alternately, and also includes a filter plate covered with filter cloth. The plate and the frame are pressed tightly to form a filter press chamber between the plate and the frame. A small hole is opened in the middle of the upper end of the plate and the frame, which becomes a channel after pressing. The sludge pressurized to 0.2-0.4MPa enters the filter press chamber through the channel. The surface of the filter plate is engraved with grooves, and the lower end is drilled with a hole for the discharge of filtrate. The filtrate is discharged under pressure to dehydrate the sludge and form a mud cake.

[0045] The plate and frame filter press of this scheme has the advantages of large filtration driving force, high solid content of filter cake, clear filtrate, high solid recovery rate, and low consumption of conditioning chemicals. Since the filtrate is fully discharged under high pressure, the formed mud cake has a low moisture content, which is convenient for subsequent transportation, storage and processing.

[0046] Furthermore, the pressed mud cake is used in roadbed filling, agricultural applications and landscaping. In agricultural applications, the mud cake is used as a soil conditioner to increase the fertility of soil organic matter after fermentation and maturation. When used in landscaping, it is used as a compost material for vegetation growth. The filtered dust is used as an auxiliary material in construction and is filled into the interior of building materials as an additive. The cleaned sand and gravel are used in the construction industry and water conservancy projects. In the construction industry, it is used as one of the manufacturing components of concrete, and in water conservancy projects, it is used as a material for dam construction and dam construction.

[0047] This solution transforms the filtered dust into an indispensable auxiliary material in construction through fine processing and quality control. These strictly screened and purified dusts not only remove harmful substances, but also retain their good physical properties, such as suitable particle grading and certain adhesion. In the preparation process of building materials, they are introduced as additives to enhance the overall performance of building materials. In the production process of building materials such as concrete, mortar or blocks, the appropriate amount of such dust can be added to effectively improve the workability of the materials, increase the density, and thus enhance the compressive strength and durability of the materials. In addition, these dusts can also be used as fillers in lightweight building materials. For example, it plays a role in the manufacture of aerated concrete, foamed concrete, etc., reducing the deadweight of buildings and improving energy-saving effects; and the cleaned sand and gravel, with its excellent physical and mechanical properties and clean surface, plays a vital role in the construction industry and water conservancy projects. In the construction industry, sand and gravel, as the main aggregate of concrete, its quality is directly related to the performance and service life of concrete. High-quality sand and gravel can significantly improve the strength, durability and impermeability of concrete, and is an indispensable cornerstone for building high-rise buildings, bridges, roads and other infrastructure. In addition, sand and gravel can also be used as foundation treatment materials, such as laying on soft foundations for compaction to improve the bearing capacity of the foundation and ensure the safety and stability of the building.

[0048] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. The waste soil treatment and utilization system for subway tunnel shield and bridge construction is characterized by: The processing and utilization system includes: a feeding and screening module, a flocculation module, a sand washing module, a filter pressing module, a recovery module and a conveying module. Each group of modules is interconnected to form a recycling and utilization system. The feeding and screening module is used to feed the waste soil and screen the dust, sand and gravel and large particles of waste soil in the waste soil; The sand washing module is used to frictionally clean the screened sand and gravel to remove dirt; The flocculation module is used to flocculate and precipitate the sludge overflowing from the sand washing module in preparation for filter pressing; The filter press module is used to filter the flocculated mud and press it into mud cake for recovery; The recovery module is used to recycle the pressed mud cake, filtered dust and cleaned sand and gravel; The conveying module is used to transport the waste soil to be processed and transport it between various modules for processing.

2. The subway tunnel shield and bridge construction waste soil treatment and utilization system according to claim 1 is characterized by: The feeding and screening module equipment is an excavator and a thin oil vibrating screen. The waste soil is fed by the excavator and sent to the top of the thin oil vibrating screen, and the waste soil is screened by the thin oil vibrating screen. The thin oil vibrating screen includes a screen box, a vibrator, a supporting device, a motor and a transmission device, wherein the motor drives the main shaft of the vibrator to rotate through the transmission device, and the screen box area vibrates under the action of the vibrator. The excavator transports the waste soil to the screen box, and the waste soil is screened by vibration. The waste soil with small particle size passes through the screen, while the waste soil with large particle size is screened out. The screened waste soil is transported and processed through the conveying module, and the small particles of waste soil are recovered through the recovery module.

3. The subway tunnel shield and bridge construction waste soil treatment and utilization system according to claim 1 is characterized by: The large particles of waste soil are transported to the sand washing module through the conveying module for cleaning. The large particles of waste soil contain sand and dust mixed with water. The sand washing module equipment is a spiral sand washing machine. The screened waste soil is transported through the conveying module and transported to the spiral sand washing machine for treatment. The spiral sand washing machine includes a weir plate, a shell, a spiral body, a reducer and a motor. The spiral sand washing machine cleans the large particles of waste soil based on the action of centrifugal force. The cleaned sand and gravel are taken away by the blades in the spiral sand washing machine and poured into the discharge trough to complete the cleaning. The liquid after cleaning forms mud water, which is transported to the flocculation module for treatment.

4. The subway tunnel shield and bridge construction waste soil treatment and utilization system according to claim 1 is characterized by: The recycling module recycles the processed waste soil through the collection box and transports the processed waste soil by truck for secondary utilization.

5. The subway tunnel shield and bridge construction waste soil treatment and utilization system according to claim 1 is characterized by: The equipment used in the conveying module is a belt conveyor, which includes a frame, conveyor belt, rollers, drums, tensioning devices and transmission devices. The transmission principle is based on the friction between the transmission drum and the belt. The waste soil is placed on the belt for transmission and transported to various processing modules for processing.

6. The subway tunnel shield and bridge construction waste soil treatment and utilization system according to claim 1 is characterized by: The flocculation module uses a flocculation tank as a device for storing muddy water. The slurry inlet mode on the top of the flocculation tank adopts a spiral feeding trough. The muddy water is poured into the flocculation tank through the feeding trough for flocculation, and flocculant is poured in for flocculation. The flocculation tank has a diameter of 9m and a height of 13m. It includes a flow current detector to monitor the flocculation situation in the flocculation tank. The coagulation effect is indirectly reflected by measuring and controlling the current generated between the two electrodes in the sampling chamber by the charged ions or particles in the chemically treated water sample.

7. The subway tunnel shield and bridge construction waste soil treatment and utilization system according to claim 1 is characterized by: After flocculation is completed, the clean water on the top of the flocculation module is discharged, leaving the muddy water containing mud at the bottom, and the muddy water at the bottom is transported to the inside of the filter press module for pressing treatment.

8. The subway tunnel shield and bridge construction waste soil treatment and utilization system according to claim 1 is characterized by: The equipment used in the filter press module is a plate and frame filter press. The filter press module is composed of plates and frames arranged alternately, and also includes filter plates covered with filter cloth. The plates and frames are pressed tightly to form a filter press chamber between the plates and the frames. A small hole is opened in the middle of the upper ends of the plates and the frames, which become a channel after being pressed. The sludge pressurized to 0.2-0.4MPa enters the filter press chamber through the channel. The surface of the filter plate is engraved with grooves, and the lower end is drilled with channels for the discharge of filtrate. The filtrate is discharged under pressure to dehydrate the sludge and form a mud cake.

9. The subway tunnel shield and bridge construction waste soil treatment and utilization system according to claim 1 is characterized by: The pressed mud cake is used in roadbed filling, agricultural applications and landscaping. In agricultural applications, the mud cake is used as a soil conditioner to increase the fertility of soil organic matter after fermentation and maturation. When used in landscaping, it is used as a compost material for vegetation growth.

10. The subway tunnel shield and bridge construction waste soil treatment and utilization system according to claim 1 is characterized by: The filtered dust is used as an auxiliary material in construction and is filled into the interior of building materials as an additive. The cleaned sand and gravel are used in the construction industry and water conservancy projects. In the construction industry, it is used as one of the manufacturing components of concrete, and in water conservancy projects, it is used as a material for dam construction and dam construction.

Images