TWI789226B - Quantitative evaluation method of dredging engineering - Google Patents

Abstract

This creation is a quantitative evaluation method of dredging engineering, which includes the steps of location classification, topographic survey, dredged soil and sand volume evaluation step, and soil and sand distribution area evaluation step; The classification step is to determine whether the river section contains engineering structures; then the topographic survey step is carried out to investigate and collect the topographic information of the river section; then the dredged soil and sand volume evaluation step is carried out to estimate the soil and sand to be dredged from the river section according to the topographic information of the river section Finally, the soil and sand distribution area evaluation step is carried out to evaluate the area where the dredged soil and sand will be piled up; this creation evaluates the dredging project in advance through a complete and systematic method to ensure that unnecessary dredging will not be carried out works, and avoid additional negative impacts from dredging works.

Description

Quantitative evaluation method for dredging engineering

This work involves dredging engineering, especially a quantitative evaluation method for dredging engineering.

The sedimentation of rivers and rocks has always been one of the key problems to be solved in river regulation. Due to the geographical relationship in Taiwan, typhoons often pass by, and the concentration of rainy seasons. Flooding is easy to occur due to a heavy rain or typhoon; therefore, it is necessary to carry out dredging works on the silted earth and rocks to maintain the flood drainage capacity of the river.

In the past, when relevant units dealt with river soil and rock siltation, they usually did not carry out a complete and systematic evaluation process. Instead, the dredging engineering team used past experience and simple measurements to directly carry out the dredging project, which made it easy to make dredging The project has caused various negative impacts, for example: 1. In the past, relevant units only relied on past experience or residents' complaints to judge whether it was necessary to carry out dredging projects for this section of the river; 2. Due to the lack of systematic evaluation, when the dredging works are carried out, the previous engineering structures may be buried by the silted soil and sand Unnoticed, excavators of the dredging engineering team may accidentally excavate these engineering structures when excavating the silted soil and sand, causing damage to these engineering structures, for example: bridge piers, foundation piles or Other structures are buried by silted soil and sand. Once the above structures are excavated during dredging, it is very likely that the bridge cannot be used safely and must be abandoned, causing heavy losses; The banks or other locations of the river section may have an impact on the ecological environment of other river sections, or cause flooding or other problems in other river sections and other locations due to landfilling.

To sum up, it is necessary to conduct a complete and systematic assessment before dredging works.

In order to solve various negative impacts that may be caused by dredging works, the purpose of this creation is to propose a quantitative evaluation of dredging works that can completely and systematically evaluate the needs of dredging works, the amount of dredged soil and sand, and avoid additional negative impacts method.

The quantitative evaluation method of dredging project proposed in this creation to solve technical problems includes: location classification step: before starting construction, judge the type of each section of a river section as open or closed and judge whether the river section includes the project Structure; topographic survey step: investigate and collect topographic information of the river section, and the topographic survey step includes on-the-spot measurement of a sand delivery slope value and a silting slope value of the river section; dredged soil and sand volume Body evaluation step: estimating the amount of soil and sand to be dredged in the river section according to the topographic information of the river section, and including estimating the amount of soil and sand according to the slope value of sand conveyance and siltation slope in the river section; and laying out soil and sand Area assessment step: assessing at least one stacking area according to the amount of soil and sand.

In the quantitative evaluation method of dredging works, the topographic survey step includes collecting topographic maps and satellite images of the river section over the years.

The quantitative assessment method of dredging works, wherein the dredging soil and sand volume assessment step includes measuring the range and depth of soil and sand deposition in the river section over the years by comparing the topographic maps and satellite images of the river section over the years, To estimate the amount of soil and sand.

In the quantitative evaluation method for dredging works, the topographic survey step includes collecting topographic maps and satellite images of the river section over the years, and collecting as-built drawings of engineering structures included in the river section.

In the quantitative evaluation method of the dredging project, the step of evaluating the volume of dredged soil and sand includes comparing the topographic maps and satellite images of the river section over the years to measure the range and depth of soil and sand deposition in the river section over the years, so as to Estimate the amount of soil and sand, and measure the height of soil and sand deposition by referring to the as-built drawings of the engineering structures included in the river section and conducting field measurements in the river section, so as to estimate the amount of soil and sand.

In the quantitative evaluation method of dredging engineering, when the location classification step is performed and it is judged that the river section does not contain engineering structures, the topographic maps and satellite image maps of the river section over the years are collected, and by comparing the The above-mentioned topographic maps and satellite images of the river section over the years were used to measure the range and depth of soil and sand deposition in the above-mentioned river section over the years, so as to estimate the amount of soil and sand.

In the quantitative evaluation method of dredging works, when the location classification step is performed and it is judged that the river section contains engineering structures, the topographic maps and satellite image maps of the river section over the years are collected, and compared with the The topographic maps and satellite images of the river section over the years were used to measure the range and depth of soil and sand deposition in the river section over the years, so as to estimate the amount of soil and sand; at the same time, the as-built drawings of the engineering structures included in the river section were collected, and by referring to the The as-built drawings of the engineering structures included in the river section are matched with on-site measurement in the river section to measure the height of soil and sand deposition, so as to estimate the amount of soil and sand.

In the quantitative evaluation method for dredging works, the step of evaluating the soil and sand distribution area includes comparing the amount of soil and sand with the capacity of the at least one stacking area, and the possibility of secondary disasters in the at least one stacking area to evaluate.

The improvement of the technical means of this creation lies in: the quantitative evaluation method of the dredging project in this creation, before the start of the dredging project, the pre-assessment is carried out, and the location classification step is firstly carried out to determine the types of each section of the river section where the project is to be carried out. And determine whether there is an engineering structure in the river section, and then carry out the topographic survey step to collect the topographic information of the river section, and then use the topographic information collected in the topographic survey step to carry out the dredging soil and sand volume evaluation step, and estimate the river section to be dredged. The amount of soil and sand, and finally carry out the evaluation step of the soil and sand layout area with the estimated amount of soil and sand to ensure the follow-up problems of soil and sand stacking; This creation evaluates the dredging works in advance through a complete and systematic method, which can ensure that unnecessary dredging works will not be carried out, and avoid additional negative impacts caused by the dredging works.

S1: Location classification steps

S2: Terrain survey steps

S21: Topographic map collection

S22: Collection of Engineering Drawings

S23: Slope measurement

S3: Evaluation steps of dredged soil and sand volume

S31: Comparative estimates over the years

S32: Engineering drawings and measurement estimates

S33: Estimation of slope adjustment

S4: Evaluation steps of soil and sand cloth area design

S41: Tolerance assessment

S42: Risk assessment

Fig. 1 is the block flow diagram of the preferred embodiment of this creation.

Fig. 2 is the schematic diagram of the operation of the topographic survey step and the evaluation step of clearing and dredging soil and sand in the preferred embodiment of the invention.

Fig. 3 is a schematic diagram of the operation of the evaluation steps of the soil and sand distribution area design in the preferred embodiment of the invention.

Fig. 4 is the operation flowchart of the preferred embodiment of this creation.

Fig. 5 is the operational flowchart of the implementation of the preferred embodiment of the present invention.

Fig. 6 is the operation flowchart of another implementation situation of the preferred embodiment of the present invention.

In order to understand the technical characteristics and practical effects of this creation in detail, and to realize it according to the content of the creation, the preferred embodiment shown in the figure is further described in detail as follows: As shown in Figure 1, this creation is preferably The quantitative evaluation method for dredging engineering of the embodiment includes the following steps in sequence: a location classification step S1, a topographic survey step S2, a dredging soil and sand volume evaluation step S3, and a soil and sand distribution area evaluation step S4.

This dredging engineering quantitative evaluation method is carried out before the dredging engineering starts, and a river section to be dredged is judged, investigated, and evaluated in advance; wherein, the river section includes a plurality of sections, and each section The type of surface can be divided into open or closed; the open section referred to here refers to the unobstructed obstacle between the river surface and the sky in the river section, such as general river course, natural pass, etc.; A closed section means that the section of the river is blocked by obstacles between the river surface and the sky; in addition, the section of the river may contain engineering structures. For an open section, it may include such as sand control Engineering structures such as dams, bed fixers, or sandy ground; as far as closed sections are concerned, engineering structures such as bridges, bridges, or culverts must be included.

The location classification step S1 is to analyze the section of the river, determine whether each section of a section of the river is open or closed before the dredging project starts, and determine whether the section of the river contains engineering structures.

The topographic survey step S2 is to investigate and collect the topographic information of the river section; as shown in Figure 2, the topographic survey step S2 includes: topographic map collection S21, engineering map collection S22 and slope measurement S23; the topographic map collection S21 is the collection of topographic maps and satellite images of the above-mentioned river section over the years; the collection of engineering drawings S22 is the collection of as-built drawings of the engineering structures included in the above-mentioned river section; the slope measurement S23 is the field measurement institute A sand-carrying slope value and a silting slope value of the river section, the sand-carrying slope value is the slope value at which the water flow of the river section can transport soil and sand, and the silting slope value is the The slope value formed by the soil and sand deposited in the river section; in this preferred embodiment, the slope measurement S23 is to measure the sand delivery slope value and the silt slope value of the river section through the laser rangefinder .

Wherein, when the location classification step S1 is performed, if it is judged that the river section does not contain engineering structures, then the topographic map collection S21 is performed; when it is judged that the river section contains engineering structures, then the topographic map collection S21 and the Collecting engineering drawings S22; and in this preferred embodiment, the topographic survey step S2 also includes the slope measurement S23, when the topographic maps, satellite image maps or included projects of the river section cannot be collected over the years When there are as-built drawings of structures, the topographic information of the river section can still be obtained through on-the-spot measurement; and when there are topographic maps, satellite image maps or as-built drawings of engineering structures included in the river section collected over the years , the integrity of data collection can be increased through the slope measurement S23.

The dredged soil and sand volume evaluation step S3 is based on the terrain information of the river section collected in the topographic survey step S2 to estimate the amount of soil and sand to be cleared and dredged in the river section; as shown in Figure 2, the dredged soil and sand volume The evaluation step S3 includes: comparative estimation over the past years S31, engineering drawing and measurement estimation S32, and slope adjustment estimation S33; Measure the range and depth of soil and sand deposition in the river section over the years by using the image map to estimate the amount of soil and sand; the engineering drawing and the measurement and estimation S32 are based on the as-built drawings of the engineering structures included in the river section. The height of soil and sand deposition is measured by field measurement in the river section, so as to estimate the amount of soil and sand; the slope adjustment estimate S33 is based on the sand delivery slope value and the silt slope value of the river section. The silt slope value of the river section is adjusted to be the same as the sand delivery slope value as a target, so as to estimate the amount of soil and sand.

Wherein, after the topographic survey step S2 is performed, if the topographic map collection S21 is successfully carried out, that is, the topographic maps and satellite image maps of the river section in the past years are successfully collected, then the comparison and estimation of the past years is carried out S31; Engineering drawing collection S22, that is, when the as-built drawing of the structures existing in the river section is successfully collected, the engineering drawing and measurement and estimation S32 are carried out; S3 also includes the slope adjustment estimate S33, if neither the topographic map collection S21 nor the engineering drawing collection S22 is successfully carried out, that is, no topographic maps, satellite image maps or the above-mentioned river section have been collected over the years The as-built drawings of the engineering structures included, and when the comparison estimation S31 or the engineering drawing and measurement estimation S32 cannot be carried out, the sand conveying slope of the river section can still be measured through the slope measurement S23 value and the silt slope value, and estimate the amount of soil and sand through the slope adjustment estimate S33; in addition, preferably, the comparison estimate S31 over the years, the engineering drawing and measurement estimate S32, and the slope adjustment estimate S33 can be carried out together, and comprehensively estimate the amount of soil and sand to increase the accuracy of the estimate; through the evaluation step S3 of the volume of the dredged soil and sand, the amount of soil and sand to be dredged by the dredging project is estimated, so as to carry out In the follow-up evaluation step S4 of the evaluation of the soil-sand distribution area designation, arrangements are made for the dredged soil and sand.

The soil and sand distribution area evaluation step S4 is to evaluate at least one stacking area based on the soil and sand volume estimated in the dredged soil and sand volume body evaluation step S3; as shown in Figure 3, the soil and sand distribution area evaluation step S4 includes in sequence: tolerance evaluation S41 and risk assessment S42; the tolerance assessment S41 is to compare the amount of soil and sand with the capacity of the at least one stacking area to confirm that the at least one stacking area has enough space for stacking The soil and sand dredged from the river section; the risk assessment S42 is to assess the possibility of secondary disasters in the at least one stacking area, and confirm whether the at least one stacking area may be damaged by the accumulation of soil and sand in the at least one stacking area. The environment causes subsequent impacts and even disasters, for example: after the soil and sand dredged from the river section are piled up in the at least one piling area, resulting in subsequent landslides in the at least one piling area due to heavy rain; through the assessment steps of the soil and sand layout area S4, ensure that after the dredging project is carried out, the dredged soil and sand can be piled up in a place, and will not cause subsequent negative impacts; as shown in Figure 4, when the location classification step S1, the topographic survey step S2, After the step S3 of evaluating the dredged soil and sand volume and the step S4 of evaluating the soil and sand distribution area, the evaluation of the dredging project is completed.

When the dredging project team intends to carry out the dredging project on a section of a certain river, it first evaluates through the quantitative evaluation method of the dredging project in the preferred embodiment of the present invention, and first performs the location classification step S1, and judges the The type of each section of the river section is open or closed and it is judged whether the river section contains engineering structures; the subsequent steps are illustrated by the following two implementation situations.

The first case is that the river section does not include engineering structures, that is, the river section only includes open sections, and does not include engineering structures such as sand control dams, bed fixers or sand settlements; at this time, as shown in Figure 5 As shown, the topographic map collection S21 and the historical comparison estimation S31 are carried out sequentially, and preferably, the slope measurement S23 and the slope adjustment estimation S33 can also be carried out sequentially at the same time, so as to increase the completeness of topographic information collection and the accuracy of the estimation of the amount of soil and sand; then according to the amount of soil and sand comprehensively estimated in the comparison estimation S31 and the slope adjustment estimation S33 over the past years, the allowable amount assessment S41 and the risk assessment S42 are performed in sequence to complete Pre-commencement assessment of dredging works on the river section in question.

The second case is that the river section includes engineering structures. There are two possibilities in this case. The first possibility is that the river section includes open and closed sections at the same time, that is, the river section includes bridges, The existence of engineering structures such as bridges, culverts or culvert pipes, the second possibility is that the river section only contains open sections, but includes the existence of engineering structures such as sand control dams, bed fixers or sand settlements; at this time, As shown in 6, the topographic map collection S21 and the comparison estimation over the past years S31 are carried out sequentially, and at the same time, the The engineering drawing collection S22 and the engineering drawing and measurement estimation S32, and preferably, the slope measurement S23 and the slope adjustment estimation S33 can also be performed sequentially at the same time, increasing the completeness of terrain information collection and the soil and sand Then, according to the comparative estimation over the past years S31, the engineering drawing and measurement estimation S32, and the slope adjustment estimation S33, comprehensively estimate the amount of soil and sand, and conduct the allowable amount evaluation S41 according to the amount of soil and sand in sequence and the risk assessment S42, the assessment before the start of the dredging works of the river section can be completed.

Through the above-mentioned technical features, this creation has the following benefits: the quantitative evaluation method of dredging works in this creation, before the start of dredging works, conducts pre-assessment, and first performs the location classification step S1 to determine the type of river section to be dredged And determine whether the river section contains engineering structures, then carry out the topographic survey step S2 to collect the topographic information of the river section, and then use the topographic information collected in the topographic survey step S2 to perform the dredged soil and sand volume evaluation step S3, estimate The amount of soil and sand to be cleared and dredged in the river section, and finally the amount of soil and sand estimated in step S3 of the volumetric evaluation of the dredged soil and sand is used to carry out the evaluation step S4 of the soil and sand distribution area design to ensure that the follow-up problems of soil and sand stacking are solved through a complete and systematic method Pre-evaluation of dredging works can ensure that unnecessary dredging works will not be carried out and additional negative impacts caused by dredging works will be avoided.

The above is only a preferred embodiment of this creation, and does not limit this creation in any form. Anyone with ordinary knowledge in the technical field can use this creation without departing from the scope of the technical solutions proposed in this creation. Creation of equivalent embodiments with partial changes or modifications made to the disclosed technical content, and without departing from the content of the technical solution of the creation, all still fall within the scope of the technical solution of the creation.

S1: Location classification steps

S2: Terrain survey steps

S3: Evaluation steps of dredged soil and sand volume

S4: Evaluation steps of soil and sand cloth area design

Claims (8)

A quantitative evaluation method for dredging engineering, which includes the following steps: location classification step: before starting construction, judge the type of each section of a river section as open or closed and judge whether the river section contains engineering structures; topographic survey Step: Investigate and collect topographic information of the river section, and the topographic survey step includes on-the-spot measurement of a sand delivery slope value and a silt slope value of the river section; the evaluation step of dredging soil and sand volume: according to Estimating the amount of soil and sand to be dredged in the river section based on the topographic information of the river section, including estimating the amount of soil and sand according to the slope value of sand conveyance and siltation slope of the river section; and the evaluation step of soil and sand distribution area: The amount of soil and sand is evaluated in at least one stacking area. The quantitative evaluation method for dredging works as described in claim 1, wherein the topographic survey step includes collecting topographic maps and satellite image maps of the river section over the years. The quantitative evaluation method for dredging works as described in claim 2, wherein the step of evaluating the volume of dredged soil and sand includes measuring the amount of soil and sand deposition in the river section over the years by comparing the topographic maps and satellite image maps of the river section over the years range and depth to estimate the amount of soil and sand. The quantitative evaluation method for dredging works as described in claim item 1, wherein the topographic survey step includes collecting topographic maps and satellite image maps of the river section over the years, and collecting as-built drawings of engineering structures included in the river section . The quantitative evaluation method for dredging works as described in claim 4, wherein the step of evaluating the volume of dredged soil and sand includes comparing the topographic maps and satellite images of the river section over the years to measure the range of soil and sand deposition in the river section over the years and depth, to estimate the amount of soil and sand, and to measure the height of soil and sand deposition by referring to the as-built drawings of the engineering structures included in the river section and conducting field measurements in the river section, so as to estimate the amount of soil and sand. The quantitative evaluation method for dredging works as described in claim 2 or 3, wherein when the location classification step is performed and it is judged that the river section does not contain engineering structures, the topographic maps and satellite images of the river section over the years are collected map, and measure the range and depth of soil and sand deposition in the river section over the years by comparing the topographic maps and satellite images of the river section over the years, so as to estimate the amount of soil and sand. The quantitative evaluation method for dredging works as described in claim 4 or 5, wherein when the location classification step is performed and it is judged that the river section contains engineering structures, the topographic maps and satellite image maps of the river section over the years are collected , and measure the range and depth of soil and sand deposition in the river section over the years by comparing the topographic maps and satellite images of the river section over the years, so as to estimate the amount of soil and sand; at the same time, collect the completed engineering structures included in the river section map, and by referring to the as-built drawings of the engineering structures included in the river section and conducting field measurements in the river section to measure the height of soil and sand deposition, so as to estimate the amount of soil and sand. The quantitative evaluation method for dredging works as described in any one of claims 1 to 5, wherein the evaluation step of the soil and sand layout area includes comparing the amount of soil and sand with the holding capacity of the at least one stacking area, and the at least one The possibility of secondary disasters in a piled area is assessed.

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