CN103074867B - The bridging method of a kind of erosion control river bottom protection soft raft sudden change place - Google Patents

Abstract

The invention discloses a method for overlapping the sudden change of the anti-scouring bottom protection soft row, which comprises the following steps: 1) making an oblique overlapping row body on land; 2) laying the oblique overlapping row body; 3) connecting the soft row at both ends body laying. The invention has the advantages of simple fabrication of the overlapping row body, which can effectively speed up the construction progress; material saving and low cost; reduction of scour pits caused by irregular edge water flow caused by conventional row body lapping, and improved bottom protection protection effect. The invention can be applied to various bottom protection projects such as land reclamation embankment, port anti-slope embankment, channel and river revetment, etc., and is especially suitable for dike sections where the beach surface in front of the embankment changes sharply and the width of the bottom protection changes frequently.

Description

A method for lapping the sudden change of the row of anti-scorching bottom protection software

technical field

The invention belongs to the engineering fields of water conservancy, port, waterway, coast and river revetment, etc., and in particular relates to a method for lapping sudden changes of anti-scour and bottom protection soft row of dikes for land reclamation, port anti-slope dikes, waterways and river revetments, etc. .

Background technique

At present, the anti-scour bottom protection methods usually include deflecting flow type, slow flow and silting type, covering protection type, etc.; from the material structure, it can be divided into riprap, firewood row, artificial aquatic plants, soft row, pile column and caisson, etc. . Among them, the covering protection type is to use anti-scouring materials to cover a certain range of scoured areas, such as soft row bottom protection, riprap bottom protection, geotechnical pillows, firewood row, concrete mold bags, etc. all belong to this category. The use of covering protection bottom protection has the advantages of fast construction, strong deformation ability of suitable beach, less change of river bed boundary conditions, and less impact on near-shore and surrounding water flow.

Soft row bottom protection is mainly suitable for embankment sections with low beach front and low wave force on the bottom protection structure. Its protection mechanism for the beach front of the embankment is mainly to use the anti-scour material-soft row to be directly laid on a certain range at the foot of the embankment to form a continuous covering bottom protection so as to protect the beach front of the embankment from the erosion of water flow and waves. The soft row has good integrity and flexibility, and can sink with the formation of the scour pit of the river bed. The arrangement has a reliable sealing effect on the protected lower soil, preventing the soil from being carried away by the water flow, and the upper block is pressed. The weight can effectively resist the erosion of the water flow, thereby protecting the stability of the covered beach.

However, due to the beach elevation, water flow and waves in front of the embankment, the width of the bottom protection in front of the embankment is different, and there is a jagged mutation of a certain width on the outer edge of the junction of different embankment sections. Sudden changes have a greater impact on the near-bottom water flow field, and scour pits are likely to appear near the jagged sudden change range, causing the original lap joints to become void after the row body sags with the row body, which is likely to cause re-scouring and cause serious damage to the safety of the building. Negative Effects. Due to the difficulty of making and laying irregular row bodies, it is required to set a certain width of the gradient section, and the outer side of the row body in the gradient section is gradually reduced. Generally, the misalignment of the row's sawtooth is controlled within 2~5m. This step-by-step gradient connection brings about a large waste of materials and cumbersome construction steps.

Therefore, it is necessary to invent a simple and easy to meet the needs of the overlapping method at the sudden change of the bottom protection of the soft row, so as to realize the overlapping of the sudden change of the bottom protection of the soft row. .

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for overlapping the sudden change of the bottom protection row with low cost, easy operation and good protection effect in view of the problems existing in the overlapping of the sudden change of the bottom protection row.

The technical problem to be solved by the present invention can be realized by the following technical solutions:

A method for lapping the sudden change of the anti-scouring bottom protection soft body row, characterized in that it includes the following steps:

1) Production of oblique row bodies on land

The structural type and thickness of the oblique row body are the same as those of the connected two ends of the bottom protection row body. The angle α between the soft body row and the adjacent short side is determined;

2) Laying of oblique row bodies

First of all, GPS positioning and steel pipe marking are used at the sudden change, then the laying ship is positioned, and finally the inclined laying is carried out;

3) The laying of the soft body at both ends of the connection

When laying the soft body at both ends of the connection, the soft body at the two ends of the connection should at least press the three sides of the inclined body.

In the step 2), the sloping row body extends into the bottom of the dyke body for a certain length near the end of the embankment body, so as to ensure the anti-scour stability of the slanting row body.

The angle α between the sloping row body and the soft body row body on the short side is determined according to the water flow, wind wave and overall river scour characteristics at the bottom protection of the project. The principle is that the more severe the scouring of the embankment, the smaller the angle α.

The bottom protection mutation connection section built by the method of the present invention overcomes the waste of materials and cumbersome construction steps caused by the conventional step-by-step gradient overlap, and is a soft bottom protection mutation with low cost, easy operation and good protection effect. A new type of overlapping method for body arrangement. Its advantages are that it is easy to make the overlapping row body, which can effectively speed up the construction progress; it saves materials and is low in cost; it reduces the scour pit caused by the irregular edge water flow caused by the conventional row body lapping, and improves the protection effect of the bottom protection. The invention can be applied to various bottom protection projects such as land reclamation embankment, port anti-slope embankment, channel and river revetment, etc., and is especially suitable for dike sections where the beach surface in front of the embankment changes drastically and the width of the bottom protection changes frequently.

Description of drawings

Fig. 1 is the schematic diagram of the row body overlapping method at the sudden change of the bottom protection of the soft row of the present invention;

FIG. 2 is a schematic cross-sectional view along line A-A of FIG. 1 .

Among them, 1-diagonal row body; 2, 2a-connected two-end row body;

Detailed ways

Describe the present invention in detail below in conjunction with accompanying drawing and specific embodiment:

As shown in Fig. 1 to Fig. 2, the preferred embodiment of the present invention discloses a method for overlapping the sudden change of the anti-scouring bottom protection soft body row, which specifically includes the following steps:

1) Production of oblique row bodies on land

Firstly, according to the scouring characteristics of the anti-scouring bottom protection position, the lap angle α between the oblique row body 1 and the soft body row body 2a on the short side is determined. The size of the angle α between them is determined according to the water flow, wind wave and overall river scour characteristics at the bottom protection of the project. The principle is that the more severe the scouring of the embankment, the smaller the angle α.

Then calculate and determine the length and width of the oblique row body 1 according to the sudden change length L of the outer edge of the two adjacent soft body row bodies 2 and 2a; The platoon body 1 is pressed under the connected soft platoon bodies 2 and 2a at both ends, and the slanted platoon body 1 is close to the end of the embankment and goes deep into the bottom of the embankment for a certain length to ensure the anti-scour stability of the slanted platoon body. The structural type and thickness of the oblique row body 1 are the same as those of the soft body row body 2, 2a connected to the bottom protection at both ends.

2) Laying of oblique row bodies

First of all, GPS positioning and steel pipe marking are used at the sudden change, then the laying ship is positioned, and finally the inclined laying is carried out;

3) The laying of the soft body at both ends of the connection

When the soft body row body 2, 2a at the two ends connected is laid, the soft body row body 2, 2a at the two ends connected at least presses the three sides of the inclined body row body 1.

Claims (1)

1. A method for lapping the sudden change of the row of anti-scouring bottom protection software, is characterized in that, comprises the following steps: 1) Production of oblique row bodies on land The structural type and thickness of the oblique row body are the same as those of the connected two ends of the bottom protection row body. The angle α between the soft body row body on the short side and the short side is determined; the angle α between the inclined body row body and the soft body row body on the short side is determined according to the water flow, wind and waves and the overall The scouring characteristics of the river regime are determined; the principle is that the more intense the scouring of the embankment, the smaller the angle α; 2) Laying of oblique row bodies Firstly, GPS positioning and steel pipe identification are adopted at the sudden change, then the positioning of the laying ship is carried out, and finally the laying of the oblique body is carried out; in the step 2), the inclined body extends into the bottom of the embankment for a certain length near the end of the embankment , to ensure the anti-shock stability of the oblique row body itself; 3) The laying of the soft body at both ends of the connection When laying the soft body at both ends of the connection, the soft body at the two ends of the connection should at least press the three sides of the inclined body.