CN109750711B - River-crossing sand mining construction device and method - Google Patents

Abstract

The invention provides a river-crossing sand-mining construction device and method, wherein a river-crossing floating bridge consisting of a plurality of floating bridge bodies is arranged on a river channel, a sand conveying pipe is fixedly arranged on the floating bridge, one end of the sand conveying pipe is connected with a sand suction boat, and the other end of the sand conveying pipe is connected to an opposite bank. In the floating bridge body, two floating bridge box bodies are fixedly connected through a plurality of connecting beams, and the floating bridge box bodies are provided with anchor tying plates for connecting anchor chains. During construction, a floating bridge box body is manufactured in a factory, and the two floating bridge box bodies are combined into a floating bridge body by utilizing a connecting beam on site; putting a stone anchor into a river to fix a floating bridge body; fixedly connecting the connecting beam floating bridge bodies until the whole floating bridge spanning the whole river channel is installed; laying a sand conveying pipe on the floating bridge, and connecting the sand suction boat with one end of the sand conveying pipe; through the steps, river-crossing sand mining construction is realized. Through adopting the scheme that the pontoon bridge pipelaying, cross the river and get husky, can adopt husky desilting dyke-consolidating construction simultaneously at the both sides in river course, be convenient for construct simultaneously, improve the efficiency of construction by a wide margin.

Description

River-crossing sand mining construction device and method

Technical Field

The invention relates to the field of sand taking for dredging and diking, in particular to a river-crossing sand mining construction device and method.

Background

The dredging and diking-strengthening engineering of a certain river is concentrated, and the construction period requirement is short. In the course of construction, if the construction ship is got sand on a bank, because equipment is comparatively intensive, get the sand radius and significantly reduce, cause to get sand equipment and get sand difficulty, the efficiency of construction reduces, and effective resource waste is serious, and construction cost improves greatly, is difficult to accomplish the construction requirement according to the volume on time.

No better solution is found in the prior art.

The existing sand suction boat usually adopts a mode of combining a stirring head and a sand suction pipe for construction, and the mode has the problems that the size of a mud block generated by the stirring head is difficult to control, the sand content of sand-containing water is difficult to control, when the sand content is higher, the sand suction pipe is easy to block, and when the sand content is lower, the sand suction efficiency is too low. Particularly, the combined structure of the stirring head and the sand suction pipe is easy to damage the riverbed, so that the bottom of the riverbed is uneven. The existing stirring head structure is easy to cause the raised sand to flow along with water and increase the water and soil loss. And the prior sand suction boat also has the problem of inconvenient maintenance and control of the sand suction head. For example, the above-mentioned technical problem is present in a mud suction device for a river suction dredger disclosed in chinese patent document CN 204803945U.

Disclosure of Invention

The invention aims to solve the technical problem of providing a river-crossing sand extraction construction device and method, which can improve the sand extraction efficiency in the silt-discharging and dike-consolidating construction and accelerate the construction progress.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a river-crossing sand-collecting construction device is characterized in that a river-crossing floating bridge consisting of a plurality of floating bridge bodies is arranged in a river channel, a sand conveying pipe is fixedly arranged on the floating bridge, one end of the sand conveying pipe is connected with a sand suction boat, and the other end of the sand conveying pipe is connected to an opposite bank.

In the preferable scheme, in the pontoon bodies, two pontoon boxes are fixedly connected through a plurality of connecting beams, and the pontoon boxes are provided with anchor tying plates for connecting anchor chains.

In a preferable scheme, the top of the pontoon box body is also provided with a mounting seat for fixing the sand conveying pipe.

In the preferable scheme, a sand suction pump is arranged on the ship body of the sand suction ship, and the ship body is also connected with a sand suction head through a connecting rod;

the sand suction head comprises a sand suction cover, the sand suction cover is hinged with the connecting rod, a horizontally arranged and rotating sand crushing roller is arranged in the sand suction cover, the sand suction cover is communicated with the sand suction pump through a sand suction pipe, the sand suction cover comprises four side walls and a top wall, and the bottom of the sand suction cover is open;

inhale the front end of husky cover and be equipped with the extension, and inhale the focus behind the articulated of husky cover and be located the position by the front end to make the front end of inhaling the husky cover contact the river bottom earlier, thereby improve and inhale husky efficiency, also prevent better that stirred silt from being washed away by the water-washed.

In the preferable scheme, a plurality of cutter bars are arranged on the roller body in the sand crushing roller, blades are arranged at the ends of the cutter bars, and roll shafts are arranged at two ends of the roller body;

the blades are arranged obliquely, namely the blades are inclined compared with the normal line of the roller body, so that the cutting efficiency is improved; the blade is inclined compared with the axis of the roller body so as to facilitate feeding and reduce the grain diameter of silt each time; the situation of blocking the sand suction pipe is avoided.

In the preferred scheme, a sand collecting cover is arranged at the position where the sand sucking cover is connected with a sand sucking pipe, the sectional area of one end of the sand collecting cover connected with the sand sucking pipe is smaller, and the sectional area of one end of the sand collecting cover connected with the sand sucking pipe is larger;

the rotation direction of the sand crushing roller is that the sand crushing roller is close to the sand collecting cover from bottom to top so as to throw sand-containing water into the sand collecting cover.

In a preferable scheme, a water inlet is formed in the front side of the top wall of the sand suction cover.

In the preferred scheme, a jet pump is further arranged on the ship body and connected with the sand suction cover through a jet pipe, and the end of the jet pipe bends to the direction of the sand collection cover.

In the preferred scheme, the hull of the sand suction boat is a catamaran, a portal is arranged on the hull, a sand suction seat is arranged on the portal and is hinged with a connecting rod, and the connecting rod is hinged with a sand suction cover of a sand suction head;

the sand suction head is positioned between the two sub-hulls of the catamaran;

the sand suction seat is provided with a winding device, and a steel wire rope of the winding device bypasses a supporting wheel positioned at the front end of the sand suction seat and is fixedly connected with the connecting rod so as to adjust the inclination angle of the connecting rod.

In the sub-ship body, the buoyancy tank ship body is movably sleeved with the driving ship body so that the buoyancy tank ship body can float up and down along the driving ship body;

the driving boat body is provided with wheels at positions close to two ends, at least one of the wheels is a driving wheel, the plate track bypasses the wheels, the plate which is approximately vertical to the track is arranged on the plate track, and the waterline of the driving boat body is positioned below the shafts of the wheels or is flush with the shafts.

A method adopting the cross-river sand production construction device comprises the following steps:

s1, manufacturing a floating bridge box body in a factory, and combining the two floating bridge box bodies into a floating bridge body by using a connecting beam on site;

s2, fixing two ends of the first floating bridge body on the shore by using steel wire ropes, and fixedly connecting the connecting beam with the floating bridge body;

s3, putting stone anchors into the river, wherein the stone anchors are steel reinforcement cages filled with stones, the stone anchors are put into the positions 70-100 meters upstream of each floating bridge body, and steel wire ropes of the stone anchors are fastened with floating pontoons to facilitate connection when the floating bridge bodies are fixed;

s4, fixedly connecting the connecting beam with a second floating bridge body, enabling the second floating bridge body to prop against the second floating bridge body from downstream through a ship and drag the second floating bridge body to a preset position, fixedly connecting the connecting beam of the second floating bridge body with the first connecting beam through a steel pin, and fixedly connecting a steel wire rope of a stone anchor with the second floating bridge body;

and so on until the whole floating bridge spanning the whole river channel is installed;

s5, laying a sand conveying pipe on the floating bridge, and connecting the sand suction boat with one end of the sand conveying pipe;

through the steps, river-crossing sand mining construction is realized.

According to the environment-friendly river-crossing sand-mining construction device and method, by adopting the scheme of floating bridge pipe laying and river-crossing sand-taking, sand-mining, silt-discharging and dike-consolidating construction can be carried out on two banks of a river channel at the same time, so that a plurality of devices can be constructed at the same time, and the construction efficiency is greatly improved. In the preferred scheme, the structure of sand head is inhaled to the modified, through the structure of the garrulous husky roller that adopts, can avoid the destruction to the riverbed, makes in the adopt husky work progress, and the riverbed still roughly keeps leveling, and in whole work progress, inhales husky operation and all accomplishes in inhaling husky cover, and inhale to be the negative pressure operating mode in the husky cover, avoids the husky quilt of stirring to take away by rivers, reduces soil erosion and water loss. The combined structure of the sand crushing roller and the sand suction cover can also utilize the centrifugal force of the sand crushing roller, improve the sand suction efficiency and reduce the power consumption of the sand suction pump; the sand suction efficiency can be further improved by the arranged jet pump and the jet pipe. And the high-pressure jet flow can also break up massive soil, so that the blockage of the sand suction pump is avoided, and the equipment abrasion is reduced. The double-body ship structure is stable in operation and flexible in operation, and is very suitable for shore sand taking operation. The combined structure of the buoyancy tank hull and the driving hull is adopted, so that the driving energy consumption can be greatly reduced, and the control performance is further improved. The adopted portal frame type sand suction structure is convenient for the maintenance of the sand suction head, and the whole ship body is balanced in stress and not easy to overturn.

Drawings

The invention is further illustrated by the following examples in conjunction with the accompanying drawings:

fig. 1 is a schematic top view of the overall structure of the present invention.

Fig. 2 is a schematic top view of the floating bridge of the present invention.

Fig. 3 is a schematic cross-sectional structure diagram of the floating bridge body of the present invention.

Fig. 4 is a schematic top view of the sand suction vessel according to the present invention.

Fig. 5 is a schematic front view of the catamaran hull of the present invention.

FIG. 6 is a schematic side view of the sand sucking head according to the present invention.

Fig. 7 is a schematic top view of the sand suction head according to the present invention.

Fig. 8 is a side view schematically showing the construction of the sand crushing roller according to the present invention.

Fig. 9 is a schematic top view of the sand crushing roller of the present invention.

In the figure: the floating bridge comprises a sand conveying pipe 1, a floating bridge body 2, a floating bridge box body 21, an anchoring plate 22, a connecting beam 3, a connecting beam 4, a chain anchor 5, a sand suction boat 6, a double-body hull 61, a floating box hull 611, a driving hull 612, a track plate 613, a tension wheel 614, a driving wheel 615, a sand suction pump 62, a sand suction pipe 63, a gantry upright 63, a jet pump 64, a jet pipe 641, a gantry 65, a sand suction seat 66, a winding device 661, a supporting wheel 662, a connecting rod 67, a sand suction head 68, a sand suction cover 681, a roller seat 682, a driving motor 683, a sand crushing roller 684, a blade 6841, a roller body 6842, a cutter bar 6843, a roller shaft 6844, a water inlet 685 and a waterline 7.

Detailed Description

Example 1:

referring to fig. 1 to 3, a river-crossing sand extraction construction device is provided with a river-crossing pontoon consisting of a plurality of pontoon bodies 2 in a river channel, a sand conveying pipe 1 is fixedly arranged on the pontoon, one end of the sand conveying pipe 1 is connected with a sand suction boat 6, and the other end of the sand conveying pipe 1 is connected to an opposite bank.

In a preferable scheme, in the pontoon 2, two pontoon cases 21 are fixedly connected through a plurality of connecting beams 4 to form the pontoon 2, and an anchor tying plate 22 for connecting an anchor chain 5 is arranged on the pontoon case 21.

In a preferred scheme, a mounting seat for fixing the sand conveying pipe 1 is further arranged at the top of the pontoon box body 21.

In a preferred scheme, as shown in fig. 1, a plurality of connecting beams 3 are welded at the top of a floating bridge body 2, in this example, a channel steel is adopted for the floating bridge body 2, the connecting beams 3 are welded with the top of the floating bridge body 2 through reinforcing ribs, in this example, two connecting beams 3 which are arranged in parallel are adopted, the connecting beams 3 are positioned at positions close to two ends of the floating bridge body 2, pin holes are arranged at the ends of the two ends of the connecting beams 3, and when the floating bridge body 2 is assembled into a floating bridge, the connecting beams 3 of the two floating bridge bodies 2 are connected together through the pin holes through steel pins.

The pontoon load is calculated as follows:

1. self weight of steel pipe

The diameter of the steel pipe of the sand conveying pipe 1 is 350mm, the wall thickness is 3mm, and the weight of the flange plates at the two ends is 18 kg.

The steel pipe had a self weight of 3.14 × 0.35 × 0.003 × 5 × 7.8 × 1000+18=146 kg.

The weight of water in the steel tube = pi d/22 × L × r water. =3.14 × 0.35 × 0.35 × 5 × 1000=481 kg.

Under the redundant condition: the weight of the three water-filled steel tubes is 3 multiplied by 481+146=1881 kg.

2. The channel steel that the tie beam adopted is heavy: 5 × 31.9 × 2=701.8kg.

3. And (3) calculating the draft of the floating bridge:

3.1, the dead weight of the floating bridge body is 3378 kg;

3.2, the weight of the 3 steel pipes filled with water is 1881 kg;

3.3, the weight of the floating bridge body connecting channel steel is 702 kg;

total weight 3378+1881+702=5961 kg.

The plane area of the floating bridge body is as follows: 1.7 × 2 × 5=17m²

The floating bridge body draft is as follows: 5.961/17=0.35 m.

According to empirical data and considering the particularity of the working environment, long-time stress and instability of wave pressure, the diameter of the steel wire rope is selected to be 16 mm.

The floating bridge is particularly suitable for construction projects with more sand-taking ships on one shore, larger engineering quantity and time. The sand-taking ship on one bank is centralized, the sand-taking radius is small, and the ship is difficult to finish any workThe land is treated, and the land is opposite to the land with a better sand field. The flow rate of the river is less than 1500m3/s, and the flow rate of the river exceeds 1500m³And (5) detaching the floating bridge at the time of/s. It is also suitable for the narrow river channel and the bend. Under the condition, the floating bridge is adopted to cross the river to take sand, so that the construction cost is greatly reduced, and the construction efficiency is greatly improved. Generally, the amount of silt engineering is considered when the floating bridge is first made to take sand across a river, and the engineering amount is 30 ten thousand meters³The above time is economical, and the later time of repeated use is 15 ten thousand meters³The above benefits are significant.

The floating bridge of the invention is applied to the flow of a big river of 1500m³Below/s, the floating bridge should be selected at the narrow curve of the river, with one end at the end of the dam and the other end at the beach.

Compared with the traditional pontoon bridge, the river-crossing pontoon bridge has the advantages of convenient installation, disassembly and transportation, short time, low cost, simple and direct laying of sand conveying pipelines and convenient maintenance when the pipelines have faults; compared with the concentrated sand taking of a plurality of ships on one shore, the simple river-crossing floating bridge has the advantages of high sand pumping concentration, less ship moving time, high construction efficiency and the like.

Example 2:

in the preferable scheme, as shown in fig. 4-9, in the sand suction vessel 6, a sand suction pump 62, preferably a centrifugal pump, is arranged on the hull, and according to the working condition of water and sand, for the river section with high mud content, a plunger type multi-cylinder mud pump, such as a multi-plunger pump produced by tsukaider, can also be adopted, and the hull is further connected with a sand suction head 68 through a connecting rod 67; preferably, the link 67 in this example is a hydraulically actuated telescopic link 67. And the connecting rod 67 can rotate in a self-adaptive manner under the action of gravity. So that the sand suction head 68 lies flat against the beach at the bottom of the riverbed.

The sand sucking head 68 comprises a sand sucking cover 681, the sand sucking cover 681 is hinged to the connecting rod 67, a horizontally-arranged and rotating sand crushing roller 684 is arranged in the sand sucking cover 681, the sand sucking cover 681 is communicated with the sand sucking pump 62 through the sand sucking pipe 621, the sand sucking cover 681 comprises four side walls and a top wall, and the bottom of the sand sucking cover 681 is open. With the structure, the silt cut by the sand crushing roller 684 is mixed with water and then sucked by the sand suction pipe 621, and due to the existence of the sand suction cover 681, the stirred silt cannot be washed away by the water. And the sand crushing roller 684 which is horizontally arranged is adopted, so that the sand crushing roller 684 can have a larger working surface and is matched with the structure of the plurality of sand suction pipes 621, and the sand suction efficiency is further improved. In this example, a structure is adopted in which one sand suction cover 681 is connected to two sand suction pipes 621.

In a preferred scheme, as shown in fig. 8 and 9, in the sand crushing roller 684, a plurality of cutter bars 6843 are arranged on a roller body 6842, in the embodiment, the cutter bars 6843 are arranged in a radial mode, and the end of each cutter bar 6843 is provided with a blade 6841. Preferably, the blade 6841 in this example is obliquely arranged, including the blade 6841 being inclined compared to the normal of the roller body 6842, to improve cutting efficiency; the blades 6841 are inclined in relation to the axis of the roller body 6842 to facilitate feeding and to reduce the particle size of each silt. Avoiding the situation of blocking the sand suction pipe 63. The two ends of the roller body 6842 are provided with roller shafts 6844. At least one end of the roller shafts 6844 is connected to a drive, in this case a hydraulically driven drive motor 683. Alternatively, it is also possible to drive the sand crushing roller 684 in rotation in a chain drive manner using an electric motor or internal combustion engine. The roller shaft 6844 is connected with the sand suction cover 681 through the roller seat 682, and a plurality of mounting holes arranged from top to bottom are formed in the side walls of the two sides of the sand suction cover 681 so as to adjust the elevation of the roller seat 682 according to the working condition. For example, during more mud conditions, roller housing 682 is adjusted to a higher position, and during less mud conditions, roller housing 682 is adjusted to a lower position.

In a preferred scheme, as shown in fig. 6 and 7, a sand collecting cover 622 is arranged at the position where the sand sucking cover 681 is connected with the sand sucking pipe 621, the sectional area of one end of the sand collecting cover 622 connected with the sand sucking pipe 621 is smaller, and the sectional area of one end of the sand collecting cover 681 connected with the sand sucking cover 681 is larger;

the sand crushing roller 684 rotates in a direction from bottom to top approaching the sand collecting cover 622 to throw the sand-laden water into the sand collecting cover 622. With this structure, the efficiency of sand suction is improved, or the power of the sand suction pump 62 can be reduced.

In a preferred embodiment, as shown in FIG. 7, a water inlet 685 is provided in the front side of the top wall of the sand-sucking shroud 681. By this arrangement, the sand is prevented from being washed away by the water, and preferably, the size of the water inlet 685 can also be adjusted according to the power of the sand pump 62. Further preferably, the front end of the sand suction hood 681, i.e., the right side in fig. 6, is provided with an extension, and the center of gravity of the sand suction hood 681 after being hinged is located at a position close to the front end, so that the front end of the sand suction hood 681 first contacts the river bottom, thereby improving sand suction efficiency and better preventing stirred sediment from being washed away by water.

In a preferred scheme, as shown in fig. 4, 6 and 7, a jet pump 64 is further arranged on the hull, the jet pump 64 is connected with a sand suction hood 681 through a jet pipe 641, and the end of the jet pipe 641 bends towards the direction of the sand collection hood 622. With the structure, the high-speed water flow ejected by the jet pipe 641 can wrap the water-containing silt to move towards the direction of the sand collecting cover 622, so that the auxiliary sand suction effect is achieved, and the sand suction efficiency is further improved. And the high-speed water flow can further break the blocky silt.

The preferable scheme is as shown in fig. 4 and 5, the hull of the sand suction boat 6 is a catamaran, a portal 65 is arranged on the hull, a sand suction seat 66 is arranged on the portal 65, the sand suction seat 66 is hinged with a connecting rod 67, and the connecting rod 67 is hinged with a sand suction cover 681 of a sand suction head 68; preferably, as shown in fig. 5, a hoisting device 661 is disposed on the sand suction base 66, and a wire rope of the hoisting device 661 is fixedly connected to the connecting rod 67 by bypassing the supporting wheel 662 disposed at the front end of the sand suction base 66. Thereby providing a solution to adjust the inclination of the link 67.

The sand suction head 68 is positioned between the two sub-hulls of the catamaran; by the structure, the connecting rod 67 with a cantilever structure is not needed, the stress of the ship body is balanced, the requirement on the driving power of the ship is reduced, and the energy consumption is reduced.

In the sub-hulls, a buoyancy tank hull 611 is movably sleeved with a driving hull 612, so that the buoyancy tank hull 611 can float up and down along the driving hull 612;

wheels are arranged at the positions, close to the two ends, of the driving hull 612, at least one of the wheels is a driving wheel 615, the plate crawler 613 is wound around the wheels, a plate which is approximately vertical to the crawler is arranged on the plate crawler 613, and the waterline 7 of the driving hull 612 is positioned below the shafts of the wheels or is flush with the shafts. This structure can further improve power utilization efficiency, further reduce the energy consumption. By adopting the scheme that the buoyancy tank hull 611 is movably sleeved with the driving hull 612, the driving hull 612 can always ensure the optimal driving water level. The ship body 612 is very convenient to drive, and particularly in the sand taking working condition, the driving steering and the reciprocating motion are very convenient. The invention is preferably driven electrically, if necessary by diesel or LNG. The descending sand suction head 68 can be self-adaptively attached to the riverbed, and the riverbed at the working position can be kept approximately flat by matching with the reciprocating scanning motion of the ship, and the water loss and soil erosion are reduced. The sand suction head 68 structure of the present invention can also be used in hulls of other structures.

Example 3:

a method adopting the cross-river sand production construction device comprises the following steps:

s1, manufacturing the floating bridge box bodies 21 in a factory, and combining the two floating bridge box bodies 21 into the floating bridge body 2 by using the connecting beam 4 on site;

s2, fixing two ends of the first floating bridge body 2 on the shore by using steel wire ropes, and fixedly connecting the connecting beam 3 with the floating bridge body 2;

s3, putting stone anchors into the river, wherein the stone anchors are steel reinforcement cages filled with stones, the stone anchors are put into the positions 70-100 meters above the upper stream of each floating bridge body 2, and steel wire ropes of the stone anchors are fastened with floating pontoons to facilitate connection when the floating bridge bodies 2 are fixed;

s4, fixedly connecting the connecting beam 3 with the second floating bridge body 2, enabling the second floating bridge body 2 to prop against the second floating bridge body 2 from downstream through a ship and drag the second floating bridge body to a preset position, fixedly connecting the connecting beam 3 of the second floating bridge body 2 with the first connecting beam 3 through a steel pin, and fixedly connecting a steel wire rope of a stone anchor with the second floating bridge body 2;

and so on until the whole floating bridge spanning the whole river channel is installed;

s5, laying a sand conveying pipe 1 on the floating bridge, and connecting a sand suction boat 6 with one end of the sand conveying pipe 1;

through the steps, river-crossing sand mining construction is realized.

The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and the scope of the present invention is defined by the claims, and equivalents including technical features described in the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the invention. On the premise of no conflict, the technical schemes in the invention can be combined and used mutually.

Claims (4)

1. The utility model provides a cross river and adopt sand construction equipment which characterized by: a river-crossing floating bridge consisting of a plurality of floating bridge bodies (2) is arranged on the river channel, a sand conveying pipe (1) is fixedly arranged on the floating bridge, one end of the sand conveying pipe (1) is connected with a sand suction ship (6), and the other end of the sand conveying pipe (1) is connected to an opposite bank;

in the pontoon body (2), two pontoon boxes (21) are fixedly connected through a plurality of connecting beams (4), and anchor tying plates (22) for connecting anchor chains (5) are arranged on the pontoon boxes (21);

the top of the pontoon box body (21) is also provided with a mounting seat for fixing the sand conveying pipe (1);

in the sand suction boat (6), a sand suction pump (62) is arranged on the boat body, and the boat body is also connected with a sand suction head (68) through a connecting rod (67);

the sand suction head (68) comprises a sand suction cover (681), the sand suction cover (681) is hinged with a connecting rod (67), a horizontally-arranged and rotating sand crushing roller (684) is arranged in the sand suction cover (681), the sand suction cover (681) is communicated with a sand suction pump (62) through a sand suction pipe (621), the sand suction cover (681) comprises four side walls and a top wall, and the bottom of the sand suction cover (681) is open;

the front end of the sand suction cover (681) is provided with an extension part, and the center of gravity of the sand suction cover (681) after being hinged is positioned at a position close to the front end, so that the front end of the sand suction cover (681) is firstly contacted with the river bottom, thereby improving the sand suction efficiency and better preventing stirred silt from being washed away by water;

a water inlet (685) is formed in the front side of the top wall of the sand suction cover (681);

in the sand crushing roller (684), a plurality of cutter bars (6843) are arranged on a roller body (6842), a blade (6841) is arranged at the end of each cutter bar (6843), and roller shafts (6844) are arranged at two ends of the roller body (6842);

the blade (6841) is obliquely arranged, namely the blade (6841) is oblique compared with the normal line of the roller body (6842) so as to improve the cutting efficiency; moreover, the blade (6841) is inclined compared with the axis of the roller body (6842) so as to facilitate the feeding and reduce the grain size of silt each time; the situation that the sand suction pipe (63) is blocked is avoided;

two ends of the roller body (6842) are provided with roller shafts (6844), and the roller shaft (6844) at least one end is connected with the driving device;

a sand collecting cover (622) is arranged at the position where the sand sucking cover (681) is connected with the sand sucking pipe (621), the sectional area of one end of the sand collecting cover (622) connected with the sand sucking pipe (621) is smaller, and the sectional area of one end of the sand collecting cover connected with the sand sucking cover (681) is larger;

the rotation direction of the sand crushing roller (684) is from bottom to top close to the sand collecting cover (622) so as to throw the sand-containing water into the sand collecting cover (622);

the sand suction boat is characterized in that the boat body of the sand suction boat (6) is a catamaran, a portal frame (65) is arranged on the boat body, a sand suction seat (66) is arranged on the portal frame (65), the sand suction seat (66) is hinged with a connecting rod (67), and the connecting rod (67) is hinged with a sand suction cover (681) of a sand suction head (68);

the sand suction head (68) is positioned between the two sub-hulls of the catamaran;

a hoisting device (661) is arranged on the sand suction seat (66), and a steel wire rope of the hoisting device (661) bypasses a supporting wheel (662) positioned at the front end of the sand suction seat (66) to be fixedly connected with the connecting rod (67) so as to adjust the inclination angle of the connecting rod (67).

2. The river-crossing sand mining construction device according to claim 1, wherein: the hull is also provided with a jet pump (64), the jet pump (64) is connected with a sand suction cover (681) through a jet pipe (641), and the end of the jet pipe (641) bends to the direction of the sand collection cover (622).

3. A river-crossing sand extraction construction device according to any one of claims 1 or 2, characterized in that:

in the sub-ship body, a buoyancy tank ship body (611) is movably sleeved with a driving ship body (612) so that the buoyancy tank ship body (611) can float up and down along the driving ship body (612);

wheels are arranged at the positions, close to the two ends, of the driving ship body (612), at least one of the wheels is a driving wheel (615), the plate crawler (613) bypasses the wheels, a plate which is approximately vertical to the crawler is arranged on the plate crawler (613), and a waterline (7) of the driving ship body (612) is positioned below an axle of the wheels or is flush with the axle.

4. A method for adopting the river-crossing sand-mining construction device as claimed in any one of claims 1-2, which is characterized by comprising the following steps:

s1, manufacturing the floating bridge box bodies (21) in a factory, and combining the two floating bridge box bodies (21) into a floating bridge body (2) by using the connecting beam (4) on site;

s2, fixing two ends of a first floating bridge body (2) on a bank by using steel wire ropes, and fixedly connecting a connecting beam (3) with the floating bridge body (2);

s3, putting stone anchors into the river, wherein the stone anchors are steel reinforcement cages filled with stones, the stone anchors are put into the positions 70-100 meters above the upper stream of each floating bridge body (2), and steel wire ropes of the stone anchors are fastened with floating pontoons to facilitate connection when the floating bridge bodies (2) are fixed;

s4, fixedly connecting the connecting beam (3) with a second floating bridge body (2), enabling the second floating bridge body (2) to prop against the second floating bridge body (2) from downstream through a ship and drag the second floating bridge body to a preset position, fixedly connecting the connecting beam (3) of the second floating bridge body (2) with the first connecting beam (3) through a steel pin, and fixedly connecting a steel wire rope of a stone anchor with the second floating bridge body (2);

and so on until the whole floating bridge spanning the whole river channel is installed;

s5, paving a sand conveying pipe (1) on the floating bridge, and connecting a sand suction boat (6) with one end of the sand conveying pipe (1);

through the steps, river-crossing sand mining construction is realized.

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