CN114482100A

CN114482100A - Reinforcing structure of cofferdam and construction method

Info

Publication number: CN114482100A
Application number: CN202210198424.8A
Authority: CN
Inventors: 周必功; 陆仲生
Original assignee: Xiangao Road And Bridge Co ltd
Current assignee: Xiangao Road And Bridge Co ltd
Priority date: 2022-03-01
Filing date: 2022-03-01
Publication date: 2022-05-13
Anticipated expiration: 2042-03-01
Also published as: CN114482100B

Abstract

The invention discloses a reinforced structure of a cofferdam and a construction method, and relates to the technical field of cofferdam construction. The base mechanism is installed before the cofferdam, can carry out spacing or direction to the cofferdam when the cofferdam is installed, supplementary cofferdam shaping, chooses for use the pipe to pour underwater concrete, when underwater concrete shaping, can effectively consolidate the cofferdam. This application has the effect that improves the cofferdam steadiness.

Description

Reinforcing structure of cofferdam and construction method

Technical Field

The invention relates to the technical field of cofferdam construction, in particular to a reinforced structure of a cofferdam and a construction method.

Background

Larsen steel sheet piles, also called U-shaped steel sheet piles, have the functions of retaining soil, water and sand during bridge cofferdam construction, large-scale pipeline laying and temporary ditch excavation, and play an important role in the projects of wharfs and unloading yards as retaining walls, embankment revetments and the like. The Larsen steel sheet pile cofferdam is green and environment-friendly, and has the advantages of high construction speed, low construction cost and good waterproof function.

When the larsen steel sheet pile cofferdam is constructed, the larsen steel sheet pile driven into the riverbed is easy to overturn and affects the use due to poor soil conditions, such as large water content and large pores of soil below the riverbed.

Disclosure of Invention

In order to improve the stability of the Larsen steel sheet pile cofferdam, the application provides a reinforced structure of the cofferdam and a construction method.

The reinforced structure of cofferdam, it is including sinking to the base mechanism of riverbed, be formed with the endless belt that supplies the cofferdam to wear to establish between base mechanism and the riverbed, concrete under water has been pour in the endless belt, concrete under water is worn to locate by the cofferdam.

Through adopting above-mentioned technical scheme, the larsen steel sheet pile is interlock in proper order and circumference closure forms the cofferdam head and the tail, and base mechanism installs before the cofferdam, can carry out spacing or direction to the larsen steel sheet pile when the cofferdam is installed, supplementary cofferdam shaping. The guide pipe is selected for pouring the underwater concrete, so that the cofferdam can be effectively reinforced when the underwater concrete is formed, and the stability of the cofferdam is improved.

Optionally, the cofferdam further comprises a stabilizing mechanism, wherein the stabilizing mechanism comprises a tight supporting assembly, the tight supporting assembly comprises a surrounding purlin, an installation rod and an inclined block arranged on the installation rod, the surrounding purlin and the installation rod are arranged on the inner side wall of the cofferdam at a relative interval, and the inclined plane of the surrounding purlin is tightly supported with the inclined plane of the inclined block.

Through adopting above-mentioned technical scheme, install enclosing purlin and installation pole respectively at the inside wall of cofferdam, make cofferdam and installation pole interval set up, and the inclined plane of sloping block and the inclined plane of enclosing purlin keep supporting tight state, when the cofferdam is inside to need the drainage, the inside water stress of cofferdam reduces, form stress difference with the outside water stress of cofferdam, so cofferdam upper portion is easy to the bending in the cofferdam, enclosing purlin also along with the bending easily, under the effect of blockking on sloping block inclined plane, can effectively delay enclosing purlin displacement, and then weaken the bending of cofferdam upper portion, and improve the steadiness of cofferdam, enclosing purlin simultaneously, the setting of installation pole and sloping block, the regulatory ability of cofferdam structure system has also been improved, regulatory ability means the cofferdam, it possesses the ability that adaptability shifts to support between tight subassembly and the rope-pulling subassembly, and shift through the balanced atress of the whole cofferdam of adaptation.

Optionally, the base mechanism includes two concrete ring seats arranged at intervals from inside to outside, and the annular band is located between the two concrete ring seats;

the stabilizing mechanism further comprises a rope pulling assembly, one end of the rope pulling assembly is connected with the concrete ring seat on the inner side of the cofferdam, and the other end of the rope pulling assembly drives the inclined block to abut against the enclosing purlin and then is fixedly arranged outside the cofferdam.

Through adopting above-mentioned technical scheme, when pouring the concrete under water, concrete ring seat can act as the template, reduces the underwater concrete of water impact, improves the concrete placement shaping quality under water, and then stabilizes the cofferdam with concrete ring seat jointly, and after the inside building of cofferdam was accomplished, concrete ring seat can protect the building, for example blockked the sedimentation of riverbed silt at the building perisporium.

Optionally, the rope pulling assembly comprises a carbon steel wire rope and an anchor rod, the anchor rod is located on a concrete ring seat outside the cofferdam, one end of the carbon steel wire rope is arranged on the concrete ring seat inside the cofferdam, and the other end of the carbon steel wire rope is connected with the anchor rod;

the mounting rod is rotatably connected with the inner side of the cofferdam, a traction wheel is fixedly arranged on the mounting rod, the carbon steel wire rope is in a stretched state, and the carbon steel wire rope is fixed and wound on the traction wheel.

By adopting the technical scheme, when the upper part of the cofferdam is bent towards the inside, the installation rod is in a rotating connection with the cofferdam, so that the installation rod only has a blocking effect to a certain degree, the carbon steel wire rope can delay the rigid damage caused by the bending of the cofferdam due to the toughness of the carbon steel wire rope, and meanwhile, when the carbon steel wire rope is loosened, the carbon steel wire rope can be pre-tightened by using a jack.

Optionally, the circumferential wall of the mounting rod is rotatably provided with a sleeve, the sleeve is fixed on the inner side wall of the cofferdam, a torsion spring is arranged at the end part of the mounting rod, and one end of the torsion spring, far away from the mounting rod, is tightly abutted against the cofferdam.

Through adopting above-mentioned technical scheme, the torsional spring can cushion the power that the installation pole axial received on the one hand, improves the axial stability of installation pole, and on the other hand when the relative sleeve of installation pole rotates, the torsional spring has the effect that makes the installation pole reset to cooperate the jack to the carbon steel wire rope pretension action after lax.

Optionally, a cross bar is welded between the anchor rods and the cofferdam.

By adopting the technical scheme, the cross rod can improve the connection performance among the concrete ring, the anchor rod and the cofferdam and improve the integrity of the cofferdam.

Optionally, an embedding groove is formed in one side, facing the enclosing purlin, of the inclined block, a pressure sensor is arranged in the embedding groove and electrically connected with an alarm control piece, and the top end of the inclined surface of the enclosing purlin abuts against the pressure sensor.

Through adopting above-mentioned technical scheme, when cofferdam upper portion is crooked, enclose the purlin along with together crooked, the inclined plane top of enclosing the purlin rotates around enclosing the department that the purlin offsets with the sloping block, and then is increasing to the pressure value that pressure sensor produced, and when the pressure value reached the fixed value that establishes in the pressure sensor, the warning control started to warn the cofferdam and has the trend that warp and topple.

The construction method of the cofferdam reinforcing structure comprises the following steps:

s1, cofferdam positioning, vibroflotation of the surface layer of the riverbed and leveling of the riverbed;

s2, mounting a base mechanism, sinking the base mechanism to a river bed, and driving a cofferdam into the bottom of the annular belt;

s3, pouring underwater concrete, namely pouring the underwater concrete between the annular belt and the cofferdam;

and S4, breaking the underwater concrete after the cofferdam is used, pulling out the cofferdam and recovering.

By adopting the technical scheme, because of the unevenness of the surface layer of the river bed, the underwater vibroflotation mode is adopted for leveling, and the vibroflotation treatment is carried out on the surface layer of the river bed, so that the balance of the soil quality of the surface layer of the river bed is improved, the flatness and the stability of the base mechanism during installation are further improved, and meanwhile, the balanced nominal soil quality of the river bed is beneficial to the consolidation of underwater concrete, and the connectivity and the stability between the underwater concrete and the river bed are improved.

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

1. the base mechanism is installed before the cofferdam, and can limit or guide the Larsen steel sheet pile when the cofferdam is installed to assist in forming the cofferdam. The guide pipe is selected for pouring the underwater concrete, and when the underwater concrete is formed, the cofferdam can be effectively reinforced;

2. under the blocking action of the inclined plane of the inclined block, the displacement of the enclosing purlin can be effectively delayed, so that the bending of the upper part of the cofferdam is weakened, the stability of the cofferdam is improved, and meanwhile, the adjusting capacity of the cofferdam structure system is also improved due to the arrangement of the enclosing purlin, the mounting rod and the inclined block;

3. the torsional spring can cushion the power that the installation pole axial received on the one hand, improves the axial stability of installation pole, and on the other hand when the relative sleeve of installation pole rotates, the torsional spring has the effect that makes the installation pole reset.

Drawings

FIG. 1 is a schematic structural diagram of a cofferdam and an entirety of an embodiment of the present application;

fig. 2 is a schematic structural diagram of a holding assembly according to an embodiment of the present application.

Description of reference numerals: 1. cofferdam; 2. an endless belt; 3. underwater concrete;

4. a propping component; 41. enclosing purlins; 42. mounting a rod; 43. a sloping block; 431. caulking grooves; 432. mounting grooves; 44. a traction wheel; 45. a sleeve; 46. a torsion spring; 47. a pressure sensor; 48. an alarm control member;

5. a concrete ring seat;

6. a cord pulling assembly; 61. a carbon steel wire rope; 62. an anchor rod; 63. a cross bar.

Detailed Description

The present application is described in further detail below with reference to figures 1-2.

The embodiment of the application discloses reinforced structure in cofferdam refers to fig. 1, fig. 2, and it includes that the base mechanism who sinks to the riverbed and the firm mechanism who connects base mechanism and cofferdam 1 respectively, and base mechanism includes two concrete ring seats 5 of placing from inside to outside in proper order the interval, is formed with closed girdle 2 between 5 relative one sides of two concrete ring seats and the riverbed top layer. The cofferdam 1 penetrates the annular belt 2 from the upper part of the annular belt 2 and is erected into a riverbed soil layer, and because of poor riverbed soil condition, the concrete annular seat 5 can effectively assist the vertical capacity kept when the cofferdam 1 is inserted and beaten, the underwater concrete 3 is poured and formed among the annular belt 2, the riverbed surface layer and the cofferdam 1, and when the structural strength of the underwater concrete 3 is stable, the stability of the cofferdam 1 is improved, and the overturning of the cofferdam 1 caused by unbalanced stress is reduced. The unbalanced stress mainly means that the relationship between the effect of the riverbed on the cofferdam 1 and the effect of the water body on the cofferdam 1 is easy to change, and the reasons for the change include poor soil quality of the riverbed, depth and flow of water, discharge of the water body in the cofferdam 1 and the like.

The cofferdam 1 is arranged in a rectangular shape. The stabilizing mechanisms are provided with four groups, wherein two groups of stabilizing mechanisms are arranged in parallel relatively, the other two groups of stabilizing mechanisms are also arranged in parallel relatively, and the two adjacent groups of stabilizing mechanisms are staggered up and down and are vertical. Meanwhile, each stabilizing mechanism is fixedly connected to three sides of the cofferdam 1, so that the integrity of the cofferdam 1 is improved.

The stabilizing mechanism comprises two groups of abutting components 4 arranged at intervals up and down and two groups of rope pulling components 6 arranged at intervals horizontally, and each abutting component 4 is fixedly connected to the inner walls of three sides of the cofferdam 1 respectively. Each rope draws subassembly 6 one end to be fixed on being located the inside concrete ring seat 5 of cofferdam 1, and each rope draws subassembly 6 other end to be fixed on being located the outside concrete ring seat 5 of cofferdam 1, under the effect that the rope draws subassembly 6, support tight subassembly 4 and cofferdam 1 three, can the adjustability maintain steadily cofferdam 1.

The abutting assembly 4 comprises a surrounding purlin 41, mounting rods 42, inclined blocks 43 and sleeves 45, the number of the sleeves 45 is two, the axes of the two sleeves 45 are located at the same height, the open ends of the two sleeves 45 are arranged in opposite directions, the closed ends of the two sleeves 45 are welded on the inner walls of the two opposite sides of the cofferdam 1 respectively, and the ends of the mounting rods 42 are connected to the inner walls of the two sleeves 45 in a rotating mode respectively. Enclose purlin 41 and be platelike, enclose purlin 41 one side welded connection in cofferdam 1 be on a parallel with the inside wall of installation pole 42, enclose purlin 41's opposite side cross-section and be the inclined plane form, the inclined plane slope is the slope upwards form, the inclined plane top of slope be close to with enclose purlin 41 welded cofferdam 1, and the inclined plane bottom of slope keep away from with enclose purlin 41 welded cofferdam 1.

Each mounting rod 42 is provided with two inclined blocks 43, and the two inclined blocks 43 are arranged at intervals. The sloping block 43 supports tightly each other with enclosing purlin 41, and the inclined plane of sloping block 43 suits with enclosing purlin 41's inclined plane, and the inclined plane length of sloping block 43 is greater than enclosing purlin 41's inclined plane length simultaneously, when enclosing purlin 41 and sloping block 43 relative rotation, encloses purlin 41 and sloping block 43 and is difficult to break away from each other.

The intersection of the inclined plane of the inclined block 43 and the top of the inclined plane of the surrounding purlin 41 is provided with an embedding groove 431, a pressure sensor 47 is embedded in the embedding groove 431, and the pressure sensor 47 can output the pressure value of the rotary extrusion of the inclined block 43 and the top of the inclined plane of the surrounding purlin 41. The pressure sensor 47 is electrically connected with the alarm control part 48, the top of the inclined block 43 is provided with a mounting groove 432, the alarm control part 48 is mounted in the mounting groove 432, and the mounting groove 432 is communicated with the caulking groove 431 and used for wiring the pressure sensor 47 and the alarm control part 48. Alarm control member 48 includes controller and audible alarm ware, and pressure sensor 47, controller and audible alarm ware electricity in proper order are connected, and when sloping block 43 and enclosing purlin 41 relative rotation extrusion, pressure sensor 47 continues the output pressure value, and when the pressure value reached the default of controller, the audible alarm began to report to the police, and warning enclosing purlin 41 is in unstable condition.

The bottom wall fixedly connected with torsional spring 46 in sleeve 45, the pot head that the diapire was kept away from in sleeve 45 to torsional spring 46 is located and is fixed on installation pole 42 perisporium, and when enclosing purlin 41 and installation pole 42 take place relative rotation, torsional spring 46 can make installation pole 42 reset, can effectively cushion installation pole 42 axial atress simultaneously, for example rivers when transmitting sleeve 45 and installation pole 42 to the effect axial of cofferdam 1.

The rope pulling component 6 comprises a carbon steel wire rope 61, an anchor rod 62 and a cross rod 63, two traction wheels 44 are fixedly connected to the mounting rod 42 at intervals, and two groups of traction wheels 44 corresponding to the carbon steel wire rope 61 and the anchor rod 62 are provided. One end of the carbon steel wire rope 61 can be fixed on the concrete ring seat 5 in the cofferdam 1 by a hanging ring, the other end of the carbon steel wire rope 61 is fixed on the traction wheel 44 on the mounting rod 42 at the lower position and wound for a plurality of circles, then fixed on the traction wheel 44 at the higher position and wound for a plurality of circles, and then the carbon steel wire rope 61 is arranged in the anchor rod 62 in a penetrating way and locked, and the carbon steel wire rope 61 in the state is in a tightened state. The anchor rod 62 is kept away from the one end of carbon steel wire rope 61 and is inserted and locate on being located the outside concrete ring seat 5 of cofferdam 1, supports tightly between 1 outer wall of cofferdam and anchor rod 62 simultaneously has the horizontal pole 63, and horizontal pole 63 is wood square timber, when improving the connectivity between cofferdam 1 and the stabilizing mean, carries out the flexible conduction between the two, helps the stabilizing mean to carry out the adaptability to cofferdam 1 and dimension steadily.

The embodiment of the application also discloses a construction method of the reinforced structure of the cofferdam, which comprises the following steps:

s1, mounting a base mechanism;

s1-1, positioning the cofferdam 1, sinking the two concrete ring seats 5 to the specified position of the river bed, and closing to form an annular belt 2;

s1-2, using underwater vibroflotation equipment to perform vibroflotation leveling on the surface layer of the river bed in the annular belt 2, and enabling the soil quality of the surface layer of the river bed to be balanced, wherein the silt floating oars escape out of the annular belt 2;

s1-3, driving the cofferdam 1 into the riverbed soil at the position of the annular belt 2 from top to bottom, and mutually engaging the head and the tail of the cofferdam 1 to form the cofferdam 1;

it should be noted that the concrete collar 5 may be formed by enclosing concrete blocks, mainly for convenience of construction.

S2, pouring underwater concrete 3, inputting the pressure of the underwater concrete 3 by using a guide pipe, wherein the underwater concrete 3 is tightly filled among the surface layer of the riverbed, the inner part of the annular belt 2 and the cofferdam 1 due to the pressure and is uniformly solidified with the soil mass mentioned in S2-1, so that the connectivity between the underwater concrete 3 and the riverbed is improved, and the soil mass strength of the surface layer of the riverbed is improved to a certain extent;

s3, pumping water in the cofferdam 1 layer by layer, and installing abutting components 4 in layers;

s3-1, welding the purlin 41 on the inner side wall of the cofferdam 1;

s3-2, welding the torsion spring 46 on the inner bottom wall of the sleeve 45;

s3-3, welding the first sleeve 45 on the inner side wall of the cofferdam 1, inserting the mounting rod 42 into the sleeve 45, sleeving the torsion spring 46 outside the mounting rod 42, and welding the torsion spring 46 on the peripheral wall of the mounting rod 42;

s3-4, welding the second sleeve 45 according to the axial direction of the mounting rod 42, and due to the interaction between the mounting rod 42 and the torsion spring 46, the mounting step of the torsion spring 46 in the step S3-3 can be repeated, and meanwhile, the inclined block 43 on the mounting rod 42 is ensured to be tightly abutted against the inclined surface of the surrounding purlin 41;

s3-5, repeating the steps from S3-1 to S3-4 to install the rest abutting components 4;

s4, after the water pumping in the cofferdam 1 is finished, installing the rope pulling component 6;

s4-1, in the step S1-1, a hole is formed in the concrete ring seat 5 in advance, after the concrete ring seat 5 is placed, the anchor rod 62 is arranged in the hole formed in the concrete ring seat 5 in a penetrating mode, and the anchor rod 62 is erected into the riverbed soil;

s4-2, a cross bar 63 is tightly propped between the anchor rods 62 and the outer wall of the cofferdam 1;

s4-3, fixing one end of the carbon steel wire rope 61 on the concrete ring seat 5 positioned in the cofferdam 1, fixing the other end of the carbon steel wire rope 61 on the traction wheel 44 at the lower position and winding a plurality of circles, then drawing the carbon steel wire rope 61 to the traction wheel at the higher position and winding a plurality of circles, and then drawing and penetrating the anchor rod 62;

s4-4, reasonably tensioning and pre-tightening the hauling cable at the anchor rod 62 by using a jack or other tensioning equipment;

s4-5, the inclined block 43 has a rotation trend and continuously acts on the top of the inclined plane of the surrounding purlin 41, so that the output value of the pressure sensor 47 is increased, an alarm is started when the first preset value of the controller is reached, and tensioning is stopped;

s4-6, repeating the steps from S4-1 to S4-5 to install the remaining rope pulling assembly 6;

it is worth noting that due to the stress difference between the inside and the outside of the cofferdam 1, the upper part of the cofferdam 1 always tends to bend inwards under the action of water, when the upper part of the cofferdam 1 bends inwards, the pressure sensor 47 is rotationally extruded through the top of the inclined plane of the surrounding purlin 41, the output value of the pressure sensor 47 is enabled to reach the second preset value of the controller, the sound alarm is triggered, and the step S4-4 is repeated;

s5, recovering the cofferdam 1 after use is finished;

s5-1, using underwater vibroflotation equipment to break the underwater concrete 3 by vibroflotation;

s5-2, recovering the abutting component 4 and part of the rope pulling component 6;

s5-3, pulling out the cofferdam 1 and the anchor rods 62;

and S5-4, recovering the concrete ring seat 5.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, 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. The reinforced structure of cofferdam, its characterized in that:

the cofferdam is characterized by comprising a base mechanism sinking to a river bed, wherein an annular belt (2) for the cofferdam (1) to penetrate through is formed between the base mechanism and the river bed, underwater concrete (3) is poured in the annular belt (2), and the cofferdam (1) penetrates through the underwater concrete (3).

2. Reinforced structure of cofferdams according to claim 1, characterized in that:

still include stabilizing mean, stabilizing mean is including supporting tight subassembly (4), support tight subassembly (4) including enclosing purlin (41), installation pole (42) and locate sloping block (43) on installation pole (42), enclose purlin (41) and install the inside wall that cofferdam (1) was located to relative interval of pole (42), just the inclined plane that encloses purlin (41) supports tightly with the inclined plane of sloping block (43).

3. Reinforced structure of cofferdams according to claim 2, characterized in that:

the base mechanism comprises two concrete ring seats (5) which are arranged from inside to outside at intervals, and the annular belt (2) is positioned between the two concrete ring seats (5);

the stabilizing mechanism further comprises a rope pulling assembly (6), one end of the rope pulling assembly (6) is connected with the concrete ring seat (5) on the inner side of the cofferdam (1), and the other end of the rope pulling assembly (6) drives the inclined block (43) to abut against and enclose the purlin (41) and then is fixedly arranged outside the cofferdam (1).

4. Reinforcing structure in cofferdams of claim 3, characterized in that:

the rope pulling assembly (6) comprises a carbon steel wire rope (61) and an anchor rod (62), the anchor rod (62) is positioned on the concrete ring seat (5) on the outer side of the cofferdam (1), one end of the carbon steel wire rope (61) is arranged on the concrete ring seat (5) on the inner side of the cofferdam (1), and the other end of the carbon steel wire rope (61) is connected with the anchor rod (62);

the installation rod (42) is rotatably connected with the inner side of the cofferdam (1), the installation rod (42) is fixedly provided with a traction wheel (44), the carbon steel wire rope (61) is in a stretched state, and the carbon steel wire rope (61) is fixed and wound on the traction wheel (44).

5. Reinforced structure of cofferdams according to claim 4, characterized in that:

the cofferdam is characterized in that a sleeve (45) is rotatably arranged on the peripheral wall of the mounting rod (42), the sleeve (45) is fixed on the inner side wall of the cofferdam (1), a torsion spring (46) is arranged at the end part of the mounting rod (42), and one end, far away from the mounting rod (42), of the torsion spring (46) is abutted against the cofferdam (1).

6. Reinforced structure of cofferdams according to claim 4, characterized in that:

and a cross bar (63) is welded between the anchor rods (62) and the cofferdam (1).

7. Reinforced structure of cofferdams according to claim 2, characterized in that:

one side, facing the surrounding purlin (41), of the inclined block (43) is provided with an embedding groove (431), a pressure sensor (47) is arranged in the embedding groove (431), the pressure sensor (47) is electrically connected with an alarm control piece (48), and the top end of the inclined plane of the surrounding purlin (41) is abutted to the pressure sensor (47).

8. The construction method of a reinforced structure of cofferdam according to any one of claims 1 to 7, wherein: the method comprises the following steps:

s1, positioning the cofferdam (1), vibrofloting the surface layer of the riverbed, and leveling the riverbed;

s2, mounting a base mechanism, sinking the base mechanism to a river bed, and driving the cofferdam (1) into the bottom of the annular belt (2);

s3, pouring underwater concrete (3), and pouring the underwater concrete (3) between the annular belt (2) and the cofferdam (1);

and S4, breaking the underwater concrete (3) after the cofferdam (1) is used, pulling out the cofferdam (1) and recovering.