CN112854138B

CN112854138B - Existing river course diversion construction method

Info

Publication number: CN112854138B
Application number: CN202110027199.7A
Authority: CN
Inventors: 凌晓明; 张焕冬; 王志林; 马英; 郭殷; 李子华; 陈景敏; 张德元
Original assignee: China Railway Guangzhou Engineering Group Co Ltd CRECGZ; CRECGZ Port and Channel Engineering Co Ltd
Current assignee: China Railway Guangzhou Engineering Group Co Ltd CRECGZ; CRECGZ Port and Channel Engineering Co Ltd
Priority date: 2021-01-09
Filing date: 2021-01-09
Publication date: 2022-07-08
Anticipated expiration: 2041-01-09
Also published as: CN112854138A

Abstract

The application relates to an existing river course diversion construction method, which comprises the following steps: the method comprises the following steps: respectively driving lock catch steel plate piles into the positions, close to the river levee, on the two sides of the river course along the trend of the river course; step two: constructing a cement mixing pile on the convex side of the river channel and performing drainage treatment on the concave side of the river channel; step three: digging backfill at the convex side of the river channel once and backfilling the backfill to the concave side in the river channel to form a slope protection; step four: constructing cement mixing piles at the position of the backfill on the sunken side in the river channel; step five: and (3) constructing cast-in-place piles under sidewalks on two sides of the river channel respectively. Soil excavated from the convex side of the river channel is backfilled to the concave side of the river channel, so that the curved river channel is straightened, the impact of water flow on the river bank is reduced, and the river channel is not easy to break; the cement mixing pile increases the strength of the soft soil foundation at the backfill position; the filling pile increases the strength of the foundation at the riverway sidewalk, so that the soil at the sidewalk part is not easy to move to the riverway side when being pressed.

Description

Existing river course diversion construction method

Technical Field

The application relates to the field of river channel construction, in particular to an existing river channel diversion construction method.

Background

Most of the rivers in the engineering range are built before the nineties of the last century, and the flood control and drainage standard is not met in 50 years. At present, the current situation of two banks of a river channel is mainly residential houses and fish ponds, partial farmlands also have the functions of tidal barrage, irrigation and drainage, most of the banks are earth banks and dry masonry banks, and the side slopes are steep. The river course is seriously washed and seriously formed due to long-term water flow erosion.

In view of the above related technologies, the inventor thinks that there is a danger that a bank breach is easily caused by the side of a bent river channel being easily washed and the width of the river channel being small.

Disclosure of Invention

In order to solve the problem that a river channel is easy to break, the application provides an existing river channel diversion construction method.

In a first aspect, the application provides an existing river diversion construction method, which adopts the following technical scheme:

an existing river course diversion construction method comprises the following steps:

the method comprises the following steps: respectively driving lock catch steel plate piles into positions, close to river banks, on two sides of the river channel along the direction of the river channel, wherein the lock catch steel plate piles on the sunken side in the river channel are higher than the preset height of the river bottom;

step two: constructing a cement mixing pile on the convex side of the river channel and performing drainage treatment on the concave side of the river channel;

step three: digging backfill at the convex side of the river channel once and backfilling the backfill to the concave side in the river channel to form a slope protection;

step four: constructing cement mixing piles at the position of the backfill on the sunken side in the river channel;

step five: constructing cast-in-place piles under sidewalks on two sides of the river respectively;

step six: and performing slope protection treatment on the position of the river bank.

By adopting the technical scheme, before the river course is redirected, locking steel sheet piles are driven into the river course to form a cofferdam so as to carry out water stop treatment on the river course, so that the construction position is kept in a dry state in the river course construction process, and the river course is excavated and constructed at the later stage; simultaneously, the hasp steel sheet pile that sets up in the river course and be close to river levee position department can also have the effect of hindrance to river course soil lateral displacement to make the in-process of later stage construction cement mixing stake and bored concrete pile, the difficult emergence side of river levee position department moves. Through constructing cement mixing pile earlier at river course salient side to increase the intensity of river course salient side, so that when the soil of excavation river course salient side, the difficult condition that appears the collapse of river course salient side. When backfilling is carried out on the inner concave side of the river channel, drainage treatment on a construction section needs to be completed firstly, so that the influence of water in the river channel on construction is reduced. Soil excavated from the convex side of the river channel is backfilled to the concave side of the river channel, so that the curved river channel is straightened, the impact of water flow on the river bank is reduced, and the river channel is not easy to break; cement mixing piles are constructed at the position of the backfill soil on the sunken side in the river channel to increase the strength of the soft soil foundation at the backfill position; the cast-in-place piles are respectively applied to the sidewalks on the two sides of the river channel to increase the strength of the foundation at the sidewalks of the river channel, so that the soil on the sidewalks is not easy to move to the aspect of the river channel when being pressed. And finally, slope protection treatment is carried out on the constructed river bank, so that the surface soil at the position of the river bank is not easy to lose water and soil.

Preferably, the fourth step includes:

and (3) firstly constructing cement mixing piles close to the river side.

Through adopting above-mentioned technical scheme, construct earlier and be close to the cement mixing stake of river side to make the soil that is close to river position department be difficult for appearing the side and move the condition of extrusion hasp steel sheet pile, the hasp steel sheet pile is difficult for appearing the condition of displacement at the in-process of construction, and the hasp steel sheet pile keeps the stagnant water effect of preferred.

Preferably, the first step: the method comprises the following steps:

and constructing gabions at the positions of the river dikes feet, and inserting the gabions into the locking steel sheet piles.

Through adopting above-mentioned technical scheme, the gabion is formed by high tensile strength, super corrosion-resistant, high anti-oxidant, the low carbon steel wire of extremely strong ductility performance through heavy hexagonal net machinery establishment, is favorable to the banketing after the construction of cement mixing stake and the roll of the pore water in the soil horizon under the bank protection, and surface water in case in the infiltration soil body, then can use the faster roll of brickwork, effectively low down the public water level to reduce behind the wall body and the slope the public water pressure. Through pegging graft in hasp steel sheet pile with the gabion, utilize the weight of gabion in order to stabilize hasp steel sheet pile to make at the in-process of construction, the difficult aversion that appears of hasp steel sheet pile.

Preferably, the second step includes:

and (4) carrying out riprap treatment on the side of the lock catch steel plate pile close to the river channel.

Through adopting above-mentioned technical scheme, through do the processing of throwing the stone in one side of hasp steel sheet pile, throw the stone and receive horizontal direction's pressure at the hasp steel sheet pile when, throw the stone and exert reverse thrust to hasp steel sheet pile to make the difficult condition that appears the displacement or buckle of hasp steel sheet pile.

Preferably, the slope protection treatment comprises the step of arranging a gabion slope protection with the thickness of 400mm from the lower part of the normal water level to the dike foot, wherein the gabion slope ratio is 1: 2.5, arranging a 300mm gravel cushion layer and two layers of geotextiles below the gabion, backfilling planting soil on the slope surface of the revetment, and spraying grass seeds from the height of 5.0m to afforest and protect the top of the revetment.

Through adopting above-mentioned technical scheme, through setting up the intensity of check guest gabion in order to improve bank protection itself, through setting up 300mm rubble bed course and two-layer geotechnological cloth under the gabion to play the effect of soil under isolated check guest gabion and the check guest gabion, so that soil under the check guest gabion is difficult for causing the influence to check guest gabion when taking place the displacement. Through planting green plants, the water and soil loss of the revetment is reduced.

Preferably, the geotextile is obliquely arranged from the position of the cast-in-place pile to the position of the cement mixing pile.

Through adopting above-mentioned technical scheme, through setting up geotechnological cloth slope to make geotechnological cloth have the effect of hindering to the removal of soil body horizontal direction.

Preferably, a layer of geogrid and a 30cm broken stone mattress layer are laid after the cement mixing pile is formed for 28 days, so that the composite foundation is formed.

By adopting the technical scheme, the geogrid and the broken stone mattress layer are laid after the cement mixing pile is formed into the pile, so that the strength of the foundation at the position of the cement mixing pile is enhanced, and the condition that the landslide is not easy to occur in the soil after the construction is finished is ensured.

Preferably, while step six is performed, the method comprises the following steps:

and a wide embankment top road is arranged at the preset height of the embankment top elevation, a drainage seepage ditch is arranged at the rear side of the embankment top road, and the drainage seepage ditch is communicated with the river channel through a drainage pipe.

By adopting the technical proposal, the utility model has the advantages that,

preferably, the cast-in-place piles on the two banks of the river are constructed synchronously.

Through adopting above-mentioned technical scheme, after soil is backfilled to the sunken side in river course, setting through hasp steel sheet pile, so that the difficult emergence side of soil of the sunken side in river course moves, and simultaneously, because the cement stirring stake that is close to river side is executed earlier and is done, therefore, keep away from the cement stirring stake and the bored concrete pile of river side when the construction, the soil of river course both sides is at the in-process of constructing cement stirring stake and bored concrete pile simultaneously, the condition of lateral displacement is difficult to appear, the cycle of construction can also be shortened simultaneously, accelerate the efficiency of construction.

In summary, the present application includes at least one of the following beneficial technical effects:

before the river course is redirected, locking steel sheet piles are driven into the river course to form cofferdams so as to enable the river course to be redirected

1. Soil excavated from the convex side of the river channel is backfilled to the concave side of the river channel, so that the curved river channel is straightened, the impact of water flow on the river bank is reduced, and the river channel is not easy to break; cement mixing piles are constructed at the position of the backfill soil on the sunken side in the river channel to increase the strength of the soft soil foundation at the backfill position; the filling piles are respectively applied to the sidewalks at the two sides of the river channel to increase the strength of the foundation at the sidewalks of the river channel, so that the soil at the sidewalks is not easy to laterally move to the river channel when being pressed;

2. firstly, constructing a cement mixing pile close to a river side, so that the soil close to the river position is not easy to laterally move and extrude the lock catch steel plate pile, the lock catch steel plate pile is not easy to displace in the construction process, and the lock catch steel plate pile keeps a better water stopping effect;

3. the stone throwing treatment is carried out on one side of the lock catch steel plate pile, when the lock catch steel plate pile receives pressure in the horizontal direction, reverse thrust is exerted on the lock catch steel plate pile by the stone throwing, and therefore the lock catch steel plate pile is not prone to displacement or bending.

Drawings

FIG. 1 is a schematic illustration of a prior art waterway;

FIG. 2 is a schematic view of an embodiment of the present application before excavation of a river;

FIG. 3 is a schematic structural diagram of the river construction completion of the present application;

fig. 4 is a schematic structural diagram of the river channel in the embodiment.

Description of reference numerals: 1. a river channel; 2. a convex side; 3. a recessed side; 4. locking steel sheet piles; 5. a gabion; 6. stirring the piles with cement; 7. filling piles; 8. slope protection; 9. a concrete slab; 10. a drain pipe; 11. and (4) draining and infiltrating the ditch.

Detailed Description

The present application is described in further detail below with reference to figures 2-4.

The embodiment of the application discloses a diversion construction method for an existing river channel 1. Referring to fig. 2, the existing diversion construction method for the river channel 1 comprises the following steps:

the method comprises the following steps: the lock catch steel plate piles 4 are respectively driven into the positions, close to the river levee, of the two sides of the river channel 1 along the trend of the river channel 1, and the lock catch steel plate piles 4 on the sunken side 3 in the river channel 1 are higher than the river bottom by a preset height.

Specifically, before the steel sheet piles are constructed, the construction wastes, surface silt and branches in the two banks and the river are cleaned, trees are felled, favorable conditions are created for construction, and the construction quality of the cofferdam is guaranteed; in order to ensure the correctness of the axial line position of the steel plate pile and the verticality of the pile, control the driving depth of the pile, prevent the bending deformation of the pile and improve the penetration capacity of the pile, a firm guide frame with certain rigidity is arranged before the construction of the steel plate pile. The guide frame is arranged in the construction range of the pile driver. The steel sheet piles are driven by screen-type driving method, when the piles are driven, 10-20 steel sheet piles are inserted into guide frame in row to make it be screen-shaped, then the piles are driven, in the course of driving and inserting the piles the inclination of every pile is measured and monitored at any time and is not more than 2%, when the inclination is too large and can not be regulated by using alignment method, the pile is drawn and driven again.

Step two: cement mixing piles 6 are arranged on the convex side 2 of the river channel 1, and the concave side of the river channel 1 is subjected to drainage treatment.

Specifically, the cement mixing pile 6 is constructed by using a cement mixing pile 6 piling machine, after a drilling machine is in place, a drilling rod is vertically aligned to the center of a pile position, and the measurement and the check are correct, so that the verticality deviation of the bottom of the cement mixing pile 6 is not more than 1.0%, the pile position positioning deviation is not more than 20mm, the pile forming error is not more than 50mm, and the pile diameter deviation is not more than 4%, and then the mixing pile construction is carried out. The treatment range of the mixing piles is about 20 meters on one side (from the bottom of a dike to the top of the dike), the longest pile length is controlled by 15 meters, the height of the top of the pile is 5 meters, the diameter of the pile is 500mm, the bottom of a gabion 5 adopts a cement mixing pile 6 grid wall (divided into solid piles and hollow piles), the wall width is 2.1m, the piles are overlapped by 100mm, the grid is 2m, and the side slope and the top of the dike are arranged in a 1.5m regular triangle (divided into solid piles and hollow piles).

Further, the side, close to the river channel 1, of the lock catch steel plate pile 4 is subjected to stone throwing treatment.

And burying and throwing stones at the position of the lock catch steel plate pile 4 close to the middle part of the river channel 1, wherein the throwing stones are abutted against the side surface of the lock catch steel plate pile 4. Before the stone is thrown, the size of the foundation trench is checked to see whether the size changes or not, and if the size changes remarkably, the foundation trench is processed. When the water content of the backfilled sediment is more than 150% and the thickness is more than 0.3m, the backfilled sediment is removed.

And laying a layer of geogrid and a 30cm broken stone mattress layer after the cement mixing pile 6 is formed for 28 days to form a composite foundation.

Referring to fig. 2 and 3, step three: and excavating backfill once on the convex side 2 of the river channel 1 and backfilling the concave side 3 in the river channel 1 to form a revetment 8.

Specifically, excavating equipment is adopted to excavate the protruding part on the protruding side 2 of the river channel 1, and the excavated soil is backfilled to the sunken part of the river channel 1 to be filled, so that the two banks of the river channel 1 form the inclined slope protection 8.

Referring to fig. 4, step four: and (3) constructing cement mixing piles 6 at the backfill positions of the sunken sides 3 in the river channel 1.

After backfilling the backfill soil on the concave side 3 in the river channel 1, a cement mixing pile 6 is driven at the position of the backfill soil to serve as a foundation at the position of the backfill soil. Before the cement mixing piles 6 are arranged, the elevation of the area field where the mixing piles are arranged is firstly leveled to +5.00, 6 grid walls of the cement mixing piles are adopted at the position of the 5 dike corners of the gabion, the wall width is 2.1m, the piles are overlapped by 100mm, and the distance is 1.5 m. The length of the cement mixing pile 6 should penetrate through the soft soil layer to enter the subjacent layer to be not less than 1m, and if the soft soil layer is deep (more than 15 m), the pile length is controlled according to 15 m. After 28 days of pile forming, a side slope can be excavated after the bearing capacity of the single pile and the bearing capacity of the composite foundation are tested to be qualified, the side slope is excavated to a river bank construction line, two layers of geotextile are laid on the dike foot and the slope surface, a layer of geogrid is laid at the top of the dike, and a broken stone cushion layer with the thickness of 300mm is laid.

Referring to fig. 4, further, cement mixing piles 6 are first constructed near the river side.

Specifically, when the cement mixing pile 6 on the backfilled soil side is constructed, the cement mixing pile 6 close to the lock catch steel plate pile 4 is constructed firstly, so that the soil on the sidewalk is not prone to lateral displacement. And constructing gabions 5 at the positions of the dikes of the river channel 1, and inserting the gabions 5 into the locking steel sheet piles 4.

Referring to fig. 4, step five: and (3) constructing cast-in-place piles 7 under sidewalks on two sides of the river channel 1 respectively.

Specifically, before construction, measurement and setting-out are carried out firstly, a working surface is prepared, then the cast-in-place pile 7 is constructed after the pile machine is in place, and the cast-in-place piles 7 are arranged in three rows in a rectangular array mode. And the filling piles 7 on the two sides of the river channel 1 are synchronously constructed to accelerate the construction efficiency.

Referring to fig. 4, step six: and (4) performing slope protection 8 treatment on the position of the river bank.

Specifically, the treatment of the revetment 8 comprises the following steps of setting a gabion 5 revetment 8 with the thickness of 400mm to a dike foot from a normal water level, wherein the slope ratio of the gabion 5 is 1: 2.5, arranging a 300mm gravel cushion layer and two layers of geotextiles below the gabion 5, backfilling planting soil on the slope surface of the revetment, and spraying grass seeds from the height of 5.0m to afforest and protect the top of the revetment. The geotextile is obliquely arranged from the position of the cast-in-place pile 7 to the position of the cement mixing pile 6.

Referring to fig. 4, further, the method comprises the steps of: a wide embankment top road is arranged at a preset height of the embankment top, a drainage seepage ditch 11 is arranged on the rear side of the embankment top road, and the drainage seepage ditch 11 is communicated with the river channel 1 through a drainage pipe 10. And a concrete slab 9 is laid on the top of the wide embankment.

The implementation principle of the existing river channel 1 diversion construction method in the embodiment of the application is as follows:

during the construction, squeeze into in order to carry out the stagnant water in river course 1 with hasp steel sheet pile 4 earlier, then take out the water of 1 section in river course of will being under construction and dry, 1 salient side 2 in river course beats cement mixing pile 6, then backfill 1 salient side 2 in river course's earth excavation to 1 sunken side 3 in river course, then beat cement mixing pile 6 in proper order to bank position department from being close to hasp steel sheet pile 4 in backfill soil department, then simultaneously under bank both sides pavement construction bored concrete pile 7, carry out bank protection 8 to 1 lateral wall in river course and handle at last. Through the mode of changing the way to increase the capacity of river course 1, so that when heavy rain weather, the condition of levee breaking or flood is difficult to appear in river course 1.

The above are preferred embodiments of the present application, and the scope of protection of the present application is not limited thereto, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A method for diversion construction of an existing river channel is characterized by comprising the following steps: the method comprises the following steps:

the method comprises the following steps: respectively driving lock catch steel plate piles (4) at positions, close to river banks, on two sides of the river channel (1) along the trend of the river channel (1), wherein the lock catch steel plate piles (4) on the sunken sides (3) in the river channel (1) are higher than the river bottom by a preset height;

step two: cement mixing piles (6) are constructed on the convex side (2) of the river channel (1) and drainage treatment is carried out on the inner concave side (3) of the river channel (1);

step three: excavating backfill at one time on the convex side (2) of the river channel (1) and backfilling the convex side (3) in the river channel (1) to form a revetment (8);

step four: constructing cement mixing piles (6) at the backfill positions of the sunken sides (3) in the river channel (1);

step five: constructing cast-in-place piles (7) under sidewalks on two sides of the river channel (1) respectively;

step six: and (4) performing slope protection (8) treatment on the position of the river bank.

2. The existing river diversion construction method according to claim 1, characterized in that: the fourth step comprises the following steps:

and (3) constructing a cement mixing pile (6) close to the river side.

3. The existing river course (1) diversion construction method according to claim 1, characterized in that: the first step is as follows: the method comprises the following steps:

and constructing gabions (5) at the positions of the dikes of the river channel (1), wherein the gabions (5) are inserted into the lock catch steel sheet piles (4).

4. The existing river diversion construction method according to claim 3, wherein: the second step comprises the following steps:

and stone throwing treatment is carried out on the side, close to the river channel (1), of the lock catch steel plate pile (4).

5. The existing river diversion construction method according to claim 1, characterized in that: slope protection (8) are handled and are set up thick gabion (5) bank protection (8) of 400mm including below the normal water level to the dyke foot, gabion (5) slope ratio 1: 2.5, arranging a 300mm gravel cushion layer and two layers of geotextiles below the gabion (5), backfilling planting soil on the slope surface of the revetment, and spraying grass seeds from a height of 5.0m to afforest and protect the top of the revetment.

6. The existing river diversion construction method according to claim 5, wherein: the geotextile is obliquely arranged from the position of the cast-in-place pile (7) to the position of the cement mixing pile (6).

7. The existing river course diversion construction method according to claim 4, characterized in that: and (3) laying a layer of geogrid and a 30cm broken stone mattress layer after the cement mixing pile (6) is formed for 28 days to form a composite foundation.

8. The existing river diversion construction method according to claim 1, characterized in that: while step six is carried out, the method comprises the following steps:

a wide embankment top road is arranged at a preset height of the embankment top, a drainage seepage ditch (11) is arranged on the rear side of the embankment top road, and the drainage seepage ditch (11) is communicated with the river channel (1) through a drainage pipe (10).

9. The existing river course (1) diversion construction method according to claim 2, characterized in that: and the cast-in-place piles (7) on the two banks of the river channel (1) are synchronously constructed.