Method for Rapid Flow Curing Construction of Honeycomb Cofferdam Based on Industrial Waste

Abstract

The present invention discloses a rapid-flow solidification construction method for a honeycomb cofferdam based on industrial waste, comprising the following steps: S1: Connect steel sheet piles to form a cofferdam structure, which consists of two layers from the inside to the outside. The inner layer is a sludge storage area, and the outer layer is a cofferdam reinforcement area surrounding the outside of the sludge storage area. The cofferdam reinforcement area is composed of a plurality of honeycomb-shaped single reinforcement areas arranged in sequence; S2: Transport the dredged bottom sludge into the single reinforcement area and simultaneously add rapid-hardening and early-strength cement; S3: Transport the dredged bottom sludge into the sludge storage area by a slurry pump, and simultaneously add a modifier made from industrial waste. The mass ratio of each component of the modifier to the sludge is: Portland cement 10% - 20%, phosphogypsum 5% - 10%, fly ash 3% - 5%, activator 0.2% - 0.5%, and the remaining component is sludge. The cofferdam is an assembled structure with high construction efficiency. Moreover, the cofferdam structure is in a completely upright state without inclined planes, with high space utilization rate. The cofferdam is directly constructed using the river bottom sludge without the need to purchase external soil resources.

Description

Technical Field

[0001] The invention relates to the technical field of river channel dredging, and in particular to a method for constructing a honeycomb cofferdam by rapid flow solidification based on industrial waste. Background Art

[0002] The routine dredging of urban rivers and lakes generally adopts the method of hydraulic suction. This dredging method relies on knives or high-pressure water flow to cut the soil into slurry, and uses a centrifugal pump to directly transport the slurry to the yard through a pipeline for disposal. At present, the disposal yard generally temporarily utilizes the undeveloped adjacent plots near rivers and lakes. However, with the increasing improvement of urban construction and development, the available land resources will become increasingly scarce, and the surrounding land of rivers and lakes will show higher and higher commercial value. It can be foreseen that the routine dredging of urban rivers and lakes will inevitably be restricted by the disposal site. In addition, since the sludge produced by hydraulic dredging in my country often has a water content of 2.0 to 3.0 times the original mud liquid limit after the dredging construction is completed, or even higher, it takes a lot of cement to treat the sludge with such a high water content, resulting in too high a treatment cost.

[0003] Traditional storage yards generally need to purchase additional earthwork resources for the filling of earth cofferdams. In order to ensure the stability of the earth slope, the slope must be built to a certain slope. Therefore, the cross-section of the earth cofferdam is trapezoidal, which requires a considerable proportion of the area to be occupied for the filling of the yard cofferdam. The cross-section of the mud storage space formed by the cofferdam is inverted trapezoidal, which makes the mud storage capacity of the lower part of the mud storage space smaller than the mud storage capacity of the upper part. However, according to the regulations, a 0.5-meter surplus water depth and a 0.5-meter wind and wave height must be left above the earth cofferdam to prevent the surplus water from flooding the embankment and causing a embankment collapse accident. This makes it difficult to use the space with large mud storage capacity above, and the utilization rate of the mud storage space is low. Summary of the invention

[0004] The embodiment of the present application provides a method for quickly flowing and solidifying a honeycomb cofferdam based on industrial waste, thereby solving the problems of low utilization rate and long construction period of traditional earth cofferdams.

[0005] The present application embodiment provides a method for rapid flow solidification construction of a honeycomb cofferdam based on industrial waste, comprising the following steps:

[0006] S1: Arrange and connect the steel sheet piles in sequence to form a cofferdam structure. The cofferdam structure includes two layers from the inside to the outside. The inner layer is the mud storage area of the overall structure, and the outer layer is the cofferdam reinforcement area surrounding the outside of the mud storage area. The cofferdam reinforcement area is composed of a plurality of honeycomb-shaped monomer reinforcement areas arranged in sequence;

[0007] S2: dredging is performed by hydraulic suction, and the dredged sludge is transported into the monomer reinforcement area by a slurry pump. During the transportation of the sludge, rapid-hardening early-strength cement is added simultaneously to form cement-solidified soil with the sludge;

[0008] S3: After the cofferdam structure is reinforced, dredging is carried out by hydraulic cutter suction. The dredged sediment is transported into the sediment storage area by a slurry pump. During the process of transporting the sediment, a modifier made from industrial waste is added synchronously. The mass ratio of each component of the modifier to the silt is: Portland cement 10% - 20%, phosphogypsum 5% - 10%, fly ash 3% - 5%, activator 0.2% - 0.5%, and the remaining component is silt.

[0009] The beneficial effects of the above embodiments are as follows:

[0010] 1. The prefabricated and installed cofferdam has a high construction efficiency;

[0011] 2. The cofferdam reinforcement area is divided into multiple small-structured single reinforcement areas, which can improve the reinforcement strength of the overall structure;

[0012] 3. The cofferdam is in a completely vertical state without a trapezoidal structure, reducing the occupied area compared with the traditional structure;

[0013] 4. Directly using the river bottom silt to build the cofferdam eliminates the need to purchase external soil resources, saving costs and shortening the construction period;

[0014] 5. There is no risk of overtopping failure for the cofferdam, and there is no need to consider the extra water depth and wave run-up on it, making full use of the sediment storage space;

[0015] 6. The honeycomb-like hollow structures are arranged closely with high space utilization rate. The honeycomb-like hollow structures can be constructed according to the site topography, being flexible and applicable;

[0016] 7. Based on the idea of treating waste with waste, using industrial waste to dispose of dredged silt waste. On the one hand, it can solve the problem of the disposal of some industrial waste, deal with the increasing amount of dredged silt waste, and play a role in treating waste with waste; on the other hand, it can significantly reduce the cement consumption and the cost of sediment disposal; on the third hand, it can turn the dredged waste mud into soil resources, realizing the resource utilization of waste and achieving an effect of 1 + 1 > 2.

[0017] Based on the above embodiments, the embodiments of the present application can also be improved as follows:

[0018] In one embodiment of the present application: In the step S1, a sealing rubber pad is laid at the bottom of the steel sheet pile. The beneficial effect of this step: It can improve the sealing effect at the bottom of the cofferdam structure.

[0019] In one embodiment of the present application: The activator is triethanolamine. Description of the Drawings

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0021] Figure 1 It is the top view of the cofferdam structure in a specific embodiment;

[0022] Figure 2 It is the snap connection structure of the steel sheet piles;

[0023] 1 Steel sheet pile, 2 Mud storage area, 3 Single body reinforcement area, 4 Connecting shaft. Specific embodiments

[0024] In this application, unless otherwise clearly specified and defined, terms such as installation, connection, joining, fixing, and fastening should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, and the mechanical connection method can select a suitable connection method in the prior art, such as welding, riveting, threaded connection, bonding, pin connection, key connection, elastic deformation connection, snap connection, interference connection, and achieved by injection molding to connect structures; it can also be an electrical connection, transmitting energy or signals through electricity; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Specific embodiment

[0026] A method for quickly constructing a honeycomb cofferdam based on industrial waste by flowing and solidifying, comprising the following steps:

[0027] S1: Arrange and connect the steel sheet piles 1 in sequence to form a cofferdam structure. The cofferdam structure includes two layers from the inside to the outside. The inner layer is the mud storage area 2 with an integral structure, and the outer layer is the cofferdam reinforcement area arranged around the outside of the mud storage area 2. The cofferdam reinforcement area is composed of a plurality of honeycomb-shaped single body reinforcement areas 3 arranged in sequence. A sealing rubber pad is laid at the bottom of each steel sheet pile 1;

[0028] As Figure 1 shown, among them, at the part where only two steel sheet piles 1 are joined, the steel sheet piles 1 are snap-connected to each other. At the part where three steel sheet piles 1 are joined, a connecting shaft 4 is separately provided. The connecting shaft 4 is a vertically arranged structure. The connecting shaft 4 has three protruding parts, and each protruding part forms a clamping edge. The steel sheet pile 1 is provided with a clamping groove corresponding to the clamping edge, and the clamping edge is inserted into the corresponding clamping groove, so that the three steel sheet piles 1 are connected into an integral structure;

[0029] S2: Dredging is carried out by hydraulic cutter suction, and the dredged bottom mud is transported into the single reinforcement area 3 by a slurry pump. During the transportation of the bottom mud, quick-hardening and early-strength cement is added synchronously to form cement-solidified soil with the bottom mud.

[0030] S4: After the cement-solidified soil in all the single reinforcement areas 3 is cured, hydraulic cutter suction dredging is carried out, and the silt is transported into the mud storage area 2 by a slurry pump. During the transportation of the silt, a modifier is added synchronously. The modifier is made from industrial waste. The mass ratio of each component of the modifier to the silt is: Portland cement 10% - 20%, phosphogypsum 5% - 10%, fly ash 3% - 5%, activator 0.2% - 0.5%, and the remaining component is silt. The water content of the silt is reduced by the modifier, making the silt become loose soil and becoming a utilizable earthwork resource.

[0031] The above honeycomb cofferdam rapid flow curing construction method based on industrial waste has the following advantages:

[0032] 1. The assembled cofferdam has high erection efficiency.

[0033] 2. The cofferdam reinforcement area is divided into multiple small-structured single reinforcement areas, which can improve the reinforcement strength of the overall structure.

[0034] 3. The cofferdam is in a completely vertical state without a trapezoidal structure, reducing the floor area compared with the traditional structure.

[0035] 4. The river bottom silt is directly used to build the cofferdam without purchasing earthwork resources externally, saving costs and shortening the construction period at the same time.

[0036] 5. There is no risk of overtopping failure for the cofferdam, and there is no need to consider the additional water depth and wave overtopping on it, making full use of the mud storage space.

[0037] 6. The honeycomb hollow structure is arranged closely with high space utilization rate. The honeycomb hollow structure can be constructed according to the site terrain conditions, being flexible and applicable.

[0038] 7. Based on the idea of treating waste with waste, industrial waste is used to dispose of dredged silt waste. On the one hand, it can solve the problem of the disposal of some industrial waste and deal with the increasing amount of dredged silt waste, playing a role in treating waste with waste. On the other hand, it can greatly reduce the cement consumption and the cost of bottom mud disposal. On the third hand, it can turn the dredged waste mud into earthwork resources, realizing the resource utilization of waste and achieving an effect of 1 + 1 > 2.

[0039] The above are only embodiments of the present invention. Common knowledge such as specific structures and characteristics known in the art is not described in detail herein. Those of ordinary skill in the art know all the general technical knowledge in the technical field to which the invention pertains before the filing date or the priority date, can learn all the prior art in this field, and have the ability to apply conventional experimental means before this date. Those of ordinary skill in the art can, under the inspiration given in this application, complete and implement this solution in combination with their own abilities. Some typical well-known structures or well-known methods should not become an obstacle for those of ordinary skill in the art to implement this application. It should be noted that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, and these should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent.

Claims

1. A method for rapidly constructing a honeycomb cofferdam with fast-flowing solidification based on industrial waste, characterized in that, It includes the following steps: S1: Arrange and connect steel sheet piles in sequence to form a cofferdam structure. The cofferdam structure includes two layers from the inside to the outside. The inner layer is a sludge storage area with an integral structure, and the outer layer is a cofferdam reinforcement area arranged around the outside of the sludge storage area. The cofferdam reinforcement area is composed of multiple honeycomb-shaped single reinforcement areas arranged in sequence; Among them, at the part where three of the steel sheet piles are joined, a connecting shaft is separately provided. The connecting shaft is a vertically arranged structure. The connecting shaft has three protruding parts, and each protruding part forms a clamping edge. The steel sheet pile is provided with a clamping groove corresponding to the clamping edge; S2: Dredge the silt by means of hydraulic cutter suction. The dredged bottom sludge is transported into the single reinforcement area by a slurry pump. During the process of transporting the bottom sludge, quick-hardening early-strength cement is synchronously added and forms cement-solidified soil with the bottom sludge; S3: After the cofferdam structure is reinforced, dredge the silt by means of hydraulic cutter suction. The dredged bottom sludge is transported into the sludge storage area by a slurry pump. During the process of transporting the bottom sludge, a modifier made from industrial waste is synchronously added. The mass ratio of each component of the modifier to the sludge is: Portland cement 10% - 20%, phosphogypsum 5% - 10%, fly ash 3% - 5%, activator 0.2% - 0.5%, and the remaining component is sludge.

2. The rapid flow curing construction method of the cellular cofferdam according to claim 1, characterized in that, In step S1, a sealing rubber pad is laid at the bottom of the steel sheet pile.

3. The rapid flow and solidification construction method of the honeycomb cofferdam according to claim 1, characterized in that The activator is triethanolamine.

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