Riverway cofferdam truss frame unit and riverway cofferdam without vertical piles

Abstract

The utility model relates to a riverway cofferdam truss frame unit and a riverway cofferdam without vertical piles, the truss frame unit comprises a plurality of triangular frames, each triangular frame is formed by sequentially, detachably and fixedly connecting three profile steels end to end, and the triangular frames are arranged in parallel at intervals and are detachably and fixedly connected by adopting transverse supports. The river cofferdam comprises a truss, the truss is formed by sequentially arranging or sequentially connecting a plurality of truss units, the face where first oblique beams of the truss units are located serves as the upstream face side of the truss, a water baffle is detachably installed on the upstream face side of the truss, and waterproof cloth is fixedly laid on the outer side face of the water baffle. The riverway cofferdam is in the shape of the transverse triangular prism and provided with the support, the riverway cofferdam is stable in structure and large in supporting strength, vertical piles inserted into the river bottom do not need to be arranged for fixing and supporting when the riverway cofferdam is applied, the risk of damaging existing pipelines at the river bottom does not exist, the construction safety coefficient is high, the piling procedure is omitted, the construction speed is high, and the construction efficiency is high.

Description

Technical Field

[0001] This utility model relates to a river cofferdam frame unit and a pileless river cofferdam using this frame unit, belonging to the technical field of water conservancy engineering construction equipment. Background Technology

[0002] Traditional river cofferdams mostly use piles (or poles, steel pipe piles) inserted into the riverbed for support and fixation. For example, patent application CN108425370A discloses a combined cofferdam and its construction method. This combined cofferdam includes a pile-membrane cofferdam, an earth-rock cofferdam, and a cutoff wall. Specifically: the pile-membrane cofferdam includes steel pipe piles, with a first impermeable membrane laid on the water-facing surface of the steel pipe piles; the earth-rock cofferdam is located on the backwater side of the pile-membrane cofferdam, with a second impermeable membrane laid on its water-facing surface; the cutoff wall is formed by driving multiple high-pressure jet grouting piles in double rows into the riverbed at the center position corresponding to the earth-rock cofferdam. These piles interlock to form a curtain, thus creating a sandwich wall within the earth-rock cofferdam. This cofferdam combines three different types of cofferdam structures to achieve the purposes of water blocking, water stopping, cofferdam reinforcement, and environmental protection. For example, utility model patent CN206829160U discloses a cofferdam structure for a mud-bearing area, including a mud-bearing soil layer, a support frame, a geotextile layer, and sandbags. The support frame includes vertical piles, horizontal connecting rods, and diagonal supports. The vertical piles and horizontal connecting rods form a cofferdam frame with a vertical enclosure. The lower end of the vertical piles is inserted into and fixed in the mud-bearing soil layer. The diagonal supports are fixed to one side of the cofferdam frame, with the upper end connected to the cofferdam frame and the lower end supporting the mud-bearing soil layer. The geotextile layer passes around the upper end of the cofferdam frame and covers both sides of the cofferdam frame. The lower part of the geotextile layer on both sides of the cofferdam frame is fixed by sandbags. The geotextile layer includes an inner layer and an outer layer. The lower end of the inner layer is embedded in the mud-bearing soil layer and compacted by sandbags, while the lower end of the outer layer is laid on the mud-bearing soil layer and compacted by sandbags. This cofferdam structure is easy to assemble, low in cost, and reliable. Each of the above technologies has its own characteristics and is suitable for its own specific application. However, in today's society, the riverbed is filled with various pipelines, and the driving of piles (usually driven vertically into the riverbed 2-3 meters) is highly likely to cause damage to the pipelines due to conflicts with their locations, resulting in construction interruption. On the other hand, without the installation of piles, the support capacity required for the cofferdam cannot be met. Utility Model Content

[0003] To overcome the above-mentioned defects of the prior art, this utility model provides a river cofferdam frame unit and a pileless river cofferdam, which does not require the use of piles inserted into the riverbed for fixing and support, and does not pose a risk of damaging existing pipelines on the riverbed.

[0004] The technical solution of this utility model to achieve the above-mentioned objective is: a river cofferdam frame unit, including several triangular frames, each of which is composed of three steel sections that are detachably and fixedly connected end to end. Several of the triangular frames are arranged in parallel at intervals and are detachably and fixedly connected by lateral support.

[0005] Preferably, the tripod is provided with an oblique support, the two ends of which are detachably connected to the bottom beam and the first oblique beam of the tripod, respectively, and the oblique support is parallel to the second oblique beam of the tripod.

[0006] Preferably, the number of the inclined supports is one or more. When the number of the inclined supports is several, the several inclined supports are arranged at intervals, preferably at equal intervals.

[0007] Preferably, the tripod is provided with a vertical support, and the two ends of the vertical support are respectively detachably connected to the bottom beam and the first inclined beam of the tripod.

[0008] Preferably, the number of vertical supports is one or more. When the number of vertical supports is several, the vertical supports are spaced apart, preferably at equal intervals.

[0009] Preferably, the top of one of the vertical supports is connected at the connection between the first inclined beam and the second inclined beam.

[0010] Preferably, there are several diagonal supports and several vertical supports, and the number of diagonal supports is one less than the number of vertical supports. Except for the vertical support whose top end is connected to the connection between the first and second diagonal beams, all other vertical supports are located on the first diagonal beam side of the vertical support. An diagonal support is provided between any two adjacent vertical supports. The top end of the diagonal support located between two adjacent vertical supports is connected to the connection between the vertical support on the corresponding side and the first diagonal beam, and the bottom end of the diagonal support is connected to the connection between the vertical support on the corresponding side and the bottom beam.

[0011] Preferably, there are multiple lateral supports, and the multiple lateral supports are respectively connected to the first inclined beam, the second inclined beam and the bottom beam of each of the tripods, that is, the lateral supports are provided on each surface of the frame unit.

[0012] Preferably, the number of lateral supports is at least three, and one of the lateral supports is connected at each corner of the tripod.

[0013] Furthermore, the connection method between the first inclined beam, the bottom beam, and the corresponding transverse support is as follows: the bottom beam is detachably connected to the corresponding transverse support, and the bottom end of the first inclined beam is detachably connected to the corresponding transverse support; the connection method between the second inclined beam, the bottom beam, and the corresponding transverse support is as follows: the bottom beam is detachably connected to the corresponding transverse support, and the bottom end of the second inclined beam is detachably connected to the corresponding transverse support; the connection method between the first inclined beam, the second inclined beam, and the corresponding transverse support is as follows: the first inclined beam is detachably connected to the corresponding transverse support, and the second inclined beam is detachably connected to the first inclined beam or the corresponding transverse support.

[0014] Preferably, among the lateral supports connected to the base beam, the number of lateral supports other than those connected to the two bottom corners of the tripod is the same as the number of diagonal supports (i.e., the number of diagonal supports of the tripod is less than the number of lateral supports connected to the base beam of the tripod). The remaining lateral supports are connected one-to-one to the bottom end of each diagonal support (i.e., the bottom end of each diagonal support of the tripod can be detachably connected to a lateral support). The connection method between the lateral supports, the diagonal supports, and the base beam is as follows: the bottom end of the diagonal support is detachably connected to the corresponding lateral support, and the base beam is detachably connected to the corresponding lateral support.

[0015] The steel sections and supports can all be made of steel pipes, square steel, or I-beams, with steel pipes being the preferred choice.

[0016] Preferably, the beams of the tripod are connected to each other, the beams are connected to the supports, and the supports are connected to each other using swivel fasteners.

[0017] A pileless river cofferdam, installed in a river channel, includes a frame. The frame is composed of multiple frame units arranged or connected sequentially. The frame unit adopts any of the river cofferdam frame units disclosed in this utility model. The surface where the first inclined beam of the frame unit is located serves as the water-facing side of the frame. A water-retaining plate is detachably installed on the water-facing side of the frame. A waterproof cloth is fixedly laid on the outer surface of the water-retaining plate. The bottom end of the waterproof cloth extends to the riverbed and is compacted and fixed with sandbags.

[0018] Preferably, there are multiple water-blocking plates, which are sequentially connected and cover the water-facing side of the frame along the extension direction of the river cofferdam. Each water-blocking plate has an equal number of protrusions and grooves on its two opposite sides, which are corresponding in position and conform to the shape. Adjacent water-blocking plates are connected by interlocking protrusions and grooves.

[0019] Depending on the size of the baffle, several rows of baffles can be arranged laterally on the water-facing side of the frame. In adjacent rows of baffles, the baffles in corresponding positions can be connected in the same way as the two adjacent baffles in the same row.

[0020] The water-blocking plate can be made of steel plate.

[0021] The water baffle is provided with a hook (not shown in the figure), and the end of the hook is provided with a screw. The water-facing side of the water baffle facing the frame is provided with a nut or threaded sleeve that cooperates with the screw. The nut or threaded sleeve is rotatably connected to the water baffle, and the screw is threadedly connected to the nut or threaded sleeve.

[0022] Preferably, the river cofferdam is equipped with a pressure detection device, which has a disc-shaped pressure detection terminal. The pressure detection terminal is located between the frame and the baffle plate and is in close contact with the frame and the baffle plate.

[0023] The number of pressure detection terminals can be multiple, and the multiple pressure detection terminals are evenly distributed along the extension direction of the river cofferdam.

[0024] Preferably, the pressure detection device is equipped with an alarm.

[0025] Preferably, the river cofferdam is equipped with a water level detection device (e.g., a water level monitor), which is located at the upper part of the river cofferdam.

[0026] The beneficial effects of this utility model are:

[0027] (1) The frame of the river cofferdam is a transverse triangular prism (with a triangular cross section), and is equipped with vertical support, diagonal support and transverse support. Its structure is stable and has high support strength. It can use the vertical water pressure of the river water to increase the friction with the river bottom, resist the lateral pressure of the river water on it and the buoyancy and uplift pressure generated by the supporting water flow. The counterweight can effectively resist the lateral sliding force, thereby forming a stable force balance system in the river water. There is no need to set up the vertical piles inserted into the river bottom for fixing and support. There is no risk of damaging the existing pipelines on the river bottom. The construction safety factor is high, and the pile driving process is saved. The construction speed is fast and the efficiency is high.

[0028] (2) The frame unit adopts a frame structure, and the steel sections (usually steel pipes) that make up the frame are connected by swivel fasteners. This allows the height of the frame unit to be quickly adjusted after the appropriate steel section connection points are disassembled. This allows the frame unit to be adjusted flexibly and quickly according to the water depth at the construction site without changing the length of the steel section, thereby adjusting the height of the river cofferdam after construction. It is applicable to a wide range of river water depths and has low construction costs. Attached Figure Description

[0029] Figure 1 This is a cross-sectional structural schematic diagram of one embodiment of the frame unit of this utility model;

[0030] Figure 2 This is a schematic diagram of the cross-sectional structure of one embodiment of the river cofferdam of this utility model applied in a river.

[0031] Figure 3 This is a schematic diagram of one embodiment of the water baffle of this utility model;

[0032] Figure 4 This is a schematic diagram showing how the insertion holes and pins are set on the bottom beam. Detailed Implementation

[0033] See Figure 1 This utility model discloses a river cofferdam frame unit, which is mainly used to connect the cofferdam frame into a river cofferdam frame according to the cofferdam construction requirements on the river site using an appropriate connection method. It includes several triangular frames, each of which is composed of three steel sections that are detachably and fixedly connected end to end. Several of the triangular frames are arranged in parallel at intervals, preferably at equal intervals, and are detachably and fixedly connected by a transverse support 1 to form a stable transverse triangular prism structure.

[0034] The tripod preferably includes an inclined support 2, with its two ends detachably connected to the base beam 3 and the first inclined beam 4 of the tripod, respectively. The inclined support is parallel to the second inclined beam 5 of the tripod. In the river channel, after the frame unit is used to construct the frame of the river cofferdam, the surface containing the first inclined beam serves as the water-facing side of the cofferdam frame (or the water-facing surface of the cofferdam). The angle between the first inclined beam and the base beam is preferably 45°. The inclined support effectively improves the support strength of the water-facing surface of the cofferdam, enhances the compressive strength of the cofferdam perpendicular to the water-facing surface, and improves the overall structural strength of the cofferdam.

[0035] The number of inclined supports can be one or several, preferably several. When the number of inclined supports is several, the several inclined supports are arranged at intervals, preferably at equal intervals, so that the inclined support force on the water-facing side of the river cofferdam is evenly distributed, and the frame collapse is avoided due to uneven force on the water-facing side of the river cofferdam.

[0036] The tripod is preferably equipped with a vertical support 6. The two ends of the vertical support are detachably connected to the bottom beam and the first inclined beam of the tripod, respectively. The setting of the vertical support can effectively improve the support strength of the water-facing side of the river cofferdam, improve the vertical compressive strength of the river cofferdam, and improve the overall structural strength of the river cofferdam.

[0037] The number of vertical supports can be one or several, preferably several. When the number of vertical supports is several, the vertical supports are arranged at intervals, preferably at equal intervals, so that the vertical support force on the water-facing side of the river cofferdam is evenly distributed, avoiding the collapse of the frame due to uneven force on the water-facing side of the river cofferdam.

[0038] When there is only one vertical support, its top end is connected to the junction of the first and second inclined beams. When there are multiple vertical supports, the top end of one of them is connected to the junction of the first and second inclined beams. This arrangement, from the perspective of the force distribution of the triangular structure, maximizes the vertical support force provided to the frame unit, ensuring optimal structural strength.

[0039] Preferably, there are several diagonal supports and several vertical supports. In practical applications, the number of diagonal supports is preferably one less than the number of vertical supports. Except for the vertical support whose top end connects to the connection between the first and second diagonal beams, all other vertical supports are located on the side facing the first diagonal beam of that vertical support, thus providing effective support for the first diagonal beam (i.e., the upstream side of the river cofferdam) (the second diagonal beam, i.e., the downstream side of the river cofferdam, does not require support). An diagonal support is provided between any two adjacent vertical supports. The top end of the diagonal support located between two adjacent vertical supports connects to the connection between the corresponding vertical support and the first diagonal beam, and the bottom end connects to the connection between the corresponding vertical support and the bottom beam. This arrangement facilitates the assembly of the frame unit and helps improve the overall structural strength of the frame unit.

[0040] The number of the transverse supports is preferably multiple, and the multiple transverse supports are respectively connected to the first inclined beam, the second inclined beam and the bottom beam of each of the triangular frames. That is, the transverse supports are provided on each surface of the frame unit to improve the structural stability and overall structural strength of the frame unit.

[0041] The number of lateral supports is at least three, with one lateral support connected to each corner of the tripod. The preferred connection method between the first inclined beam, the bottom beam, and the corresponding lateral support is as follows: the bottom beam is detachably connected to the corresponding lateral support, and the bottom end of the first inclined beam is detachably connected to the corresponding lateral support; the preferred connection method between the second inclined beam, the bottom beam, and the corresponding lateral support is as follows: the bottom beam is detachably connected to the corresponding lateral support, and the bottom end of the second inclined beam is detachably connected to the corresponding lateral support; the preferred connection method between the first inclined beam, the second inclined beam, and the corresponding lateral support is as follows: the first inclined beam is detachably connected to the corresponding lateral support, and the second inclined beam is detachably connected to either the first inclined beam or the corresponding lateral support.

[0042] Preferably, there are more than three lateral supports. In addition to the lateral supports connected to each corner of the tripod, each surface of the frame unit is also provided with lateral supports. Among the lateral supports connected to the bottom beam, the number of the remaining lateral supports, except for those connected to the two bottom corners of the tripod, is the same as the number of the diagonal supports (i.e., the number of diagonal supports of the tripod is less than the number of lateral supports connected to the bottom beam of the tripod). The remaining lateral supports are connected one-to-one to the bottom end of each diagonal support (i.e., the bottom end of each diagonal support of the tripod can be detachably connected to a lateral support). The preferred connection method between the lateral supports, the diagonal supports, and the bottom beam is that the bottom end of the diagonal support is detachably connected to the corresponding lateral support, and the bottom beam is detachably connected to the corresponding lateral support. The above-described connection structure allows for adjustable height of the frame unit. When the height of the frame unit needs to be adjusted, the connection between the bottom beam and each of the transverse supports (except for the transverse supports connected to the first inclined beam) can be disassembled, and each transverse support can be moved forward or backward to a suitable position before being reconnected and fixed to the bottom beam. The operation is simple and quick, allowing the frame unit to be flexibly and quickly adjusted according to the water depth at the construction site without changing the length of the steel section. This adjusts the height of the cofferdam after construction, making it suitable for a wide range of river depths and reducing construction costs.

[0043] The transverse supports can also be connected to each beam using other connection methods. The connection positions can be flexibly adjusted, provided that the structural strength of the frame unit is guaranteed.

[0044] Among the transverse supports connected to the first inclined beam, apart from the transverse supports connected to the top corner and corresponding bottom corner of the tripod, the remaining transverse supports can be connected one-to-one to the top of each of the inclined supports, or they can be connected to the top of each of the inclined supports on the first inclined beam in a staggered manner.

[0045] The steel sections and all supports (diagonal supports, vertical supports and horizontal supports) can be made of steel pipes, square steel or I-beams, with steel pipes being preferred. The steel pipes can be Φ48×3 steel pipes.

[0046] The connection between the beams of the tripod, between the beams and the supports, and between the supports are preferably connected by pipe fittings 12 for connecting pipes (e.g., scaffolding pipes), especially rotatable pipe fittings (e.g., swivel fasteners) that allow the connected pipes to rotate relative to each other, which is convenient for connection and facilitates relative rotation after connection.

[0047] See Figure 4 In a preferred embodiment, the bottom beam 3 and the first inclined beam 4 may be provided with a plurality of single-sided insertion holes 13 for inserting pins 14 (located on the same side of the pipe used as the bottom beam or the first inclined beam). During assembly, the single-sided insertion hole is positioned with the pipe facing upwards (the first inclined beam is angled upwards). The pin is inserted into the appropriate single-sided insertion hole, so that the pipe fitting connectors on the bottom beam and the first inclined beam abut against the pin. The pin is located on the force-bearing side, that is, on the side of the bottom beam / first inclined beam that forms an obtuse angle with the connected pipe fitting (inclined support or vertical support). The component of the force exerted on the pipe fitting connector by the connected pipe fitting (inclined support or vertical support) on the bottom beam / first inclined beam is directed towards the pin. The pin blocks the movement of the pipe fitting connector in this direction, thus ensuring overall stability even in cases of insufficient connection strength. At the same time, since the insertion holes of each bottom beam or the first inclined beam are distributed in the same position, the single-sided insertion hole or pin at the corresponding location can be used as a positioning mark for the pipe fitting connector, ensuring the consistency of the connection. Pipe connectors on the diagonal and vertical supports can be pre-installed at both ends of the pipe and firmly secured, so that when assembling and readjusting the tilt angle of the frame, there is no need to loosen or disassemble the pipe connectors on the diagonal and vertical supports.

[0048] Several frame inclination angles on the water-facing side can be preset. Based on the corresponding inclination angle, corresponding insertion holes are set for the positions of the relevant pipe fittings and connectors. The pins are inserted into the insertion holes corresponding to the inclination angles to determine the proper positions of the pipe fittings and connectors at the corresponding inclination angles, which facilitates on-site assembly and inclination angle adjustment.

[0049] By changing the insertion hole of the pin and adjusting the connection position of the diagonal and vertical supports (if any) on the bottom beam and / or on the first diagonal beam according to the pin, the tilt angle of the frame (water-facing side / water-retaining plate) can be adjusted / changed, and the frame height can be adjusted / changed to meet the cofferdam height requirements.

[0050] See Figure 2 and Figure 3This utility model also discloses a pileless river cofferdam, which is set in the river and includes a frame. The frame is composed of multiple frame units (arranged or connected sequentially according to the construction location requirements of the river cofferdam). The frame unit adopts any of the river cofferdam frame units disclosed in this utility model. The surface where the first inclined beam of the frame unit is located is the water-facing side of the frame. A water-blocking plate 7 is detachably installed on the water-facing side of the frame to block river water. A waterproof cloth 8 is fixedly laid on the outer surface of the water-blocking plate to prevent water seepage. The bottom end of the waterproof cloth extends to the river bottom and is compacted and fixed with sandbags 9 to maintain the stability of the soil at the bottom of the water-facing side of the river cofferdam and avoid piping, soil erosion and / or soil instability.

[0051] Multiple water-retaining plates are arranged sequentially along the extension direction of the river cofferdam, covering the water-facing side of the frame to effectively block river water. Each water-retaining plate has an equal number of corresponding and appropriately shaped protrusions 10 and grooves 11 on its opposite sides. Adjacent water-retaining plates are connected by matching protrusions and grooves. The water-retaining plates at both ends of the river cofferdam (the front and rearmost plates) can have only grooves or only protrusions, depending on requirements. This arrangement ensures a tighter fit between adjacent water-retaining plates and a more stable overall water-blocking structure.

[0052] Depending on the size of the baffle, several rows of baffles can be arranged laterally on the water-facing side of the frame. In adjacent rows of baffles, the baffles in corresponding positions can be connected in the same way as the two adjacent baffles in the same row.

[0053] The water-blocking plate can be made of steel plate, and the steel plate can be P6015 steel template with a thickness of 3mm.

[0054] Preferably, the baffle plate is equipped with hooks (not shown in the figure), and the ends of the hooks are provided with screws. A nut or sleeve that mates with the screw is provided on the water-facing side of the baffle plate facing the frame. The nut or sleeve is rotatably connected to the baffle plate and can be rotatably connected to the baffle plate using a suitable bracket. The screw is threadedly connected to the nut or sleeve. The number of hooks can be one or more, preferably multiple. When the number of hooks is multiple, it is preferable to have at least one hook at each of the four corners of the baffle plate. With this configuration, when the baffle plate needs to be installed on the frame, simply hook the hook onto the steel pipe on the water-facing side of the frame, and then rotate the nut or sleeve to screw the screw into the nut or sleeve, quickly and tightly tightening the baffle plate and the frame for a stable connection. This method is simple to operate and easy to assemble and disassemble. Other suitable detachable connection methods, such as binding, can also be used between the baffle plate and the frame.

[0055] The waterproof fabric may have binding holes, and it can be fixed to the frame by wire or nylon rope passing through the binding holes.

[0056] The river cofferdam is preferably equipped with a pressure detection device for real-time or periodic monitoring of the pressure on the upstream side of the cofferdam. The pressure detection device has a disc-shaped pressure detection terminal located between the frame and the baffle plate, and is in close contact with both. With this configuration, when the water level in the river rises, causing the pressure on the upstream side of the cofferdam to reach its maximum withstand pressure limit (the pressure detection device has a preset pressure limit threshold, and the pressure value detected by the pressure detection terminal is compared and analyzed with the pressure limit threshold in real time), the pressure detection device will sound an alarm (the pressure detection device is equipped with an alarm), and transmit the alarm information to the staff, reminding them to reinforce the river cofferdam in a timely manner.

[0057] The number of pressure detection terminals can be multiple, and the multiple pressure detection terminals are evenly distributed along the extension direction of the river cofferdam, so as to accurately detect the pressure on the water-facing surface of each section of the river cofferdam.

[0058] The river cofferdam is preferably equipped with a water level detection device (e.g., a water level monitor), which is located at the upper part of the river cofferdam. When the water level in the river rises to the detection height of the water level detection device, the water level detection device will sound an alarm (the water level detection device is equipped with an alarm) and transmit the alarm information to the staff, reminding them to take timely countermeasures.

[0059] Compared with existing river cofferdams, the river cofferdam of this utility model changes the stress system of the river cofferdam, transforming the stress from shear force to water flow pressure. It eliminates the need for piles inserted into the riverbed for fixing and support, avoids the risk of damaging existing pipelines on the riverbed, has a high construction safety factor, saves the pile driving process, and has a fast construction speed and high efficiency.

[0060] Any of the river cofferdam frame units of this utility model can be used for any of the pileless river cofferdams of this utility model.

[0061] Any type of pileless river cofferdam of this utility model can also adopt any type of river cofferdam frame unit of this utility model.

[0062] Unless otherwise specified or further limited to one preferred or optional technical means being another, the preferred and optional technical means disclosed in this utility model can be arbitrarily combined to form several different technical solutions.

Claims

1. A river cofferdam panel unit, characterized by The utility model provides a river cofferdam frame, which comprises a plurality of triangular frames, the triangular frames are sequentially and detachably connected by three profile steels, the plurality of triangular frames are arranged in parallel and are detachably connected by transverse supports, the triangular frames are provided with inclined supports, two ends of the inclined supports are detachably connected with bottom beams and first inclined beams of the triangular frames respectively, the inclined supports are parallel to second inclined beams of the triangular frames, the number of the inclined supports is one or a plurality, and the plurality of inclined supports are arranged at intervals, the triangular frames are provided with vertical supports, two ends of the vertical supports are detachably connected with bottom beams and first inclined beams of the triangular frames respectively, the number of the vertical supports is one or a plurality, and the plurality of vertical supports are arranged at intervals.

2. The unit of the river cofferdam according to claim 1, wherein The number of the transverse supports is a plurality, and the plurality of transverse supports are connected with the first inclined beams, the second inclined beams and the bottom beams of the triangular frames respectively.

3. The unit of a river cofferdam pier according to claim 2, characterized in that The number of the inclined supports of the triangular frames is less than the number of the transverse supports connected with the bottom beams of the triangular frames, and the bottom ends of the inclined supports of the triangular frames are detachably connected with one transverse support.

4. The unit of the river cofferdam of claim 3, wherein The beams and the supports of the triangular frames are connected by rotating fasteners.

5. A non-pile river cofferdam provided in a river, characterized in that The utility model provides a river cofferdam frame, which comprises a plurality of triangular frames, the triangular frames are sequentially and detachably connected by three profile steels, the plurality of triangular frames are arranged in parallel and are detachably connected by transverse supports, the triangular frames are provided with inclined supports, two ends of the inclined supports are detachably connected with bottom beams and first inclined beams of the triangular frames respectively, the inclined supports are parallel to second inclined beams of the triangular frames, the number of the inclined supports is one or a plurality, and the plurality of inclined supports are arranged at intervals, the triangular frames are provided with vertical supports, two ends of the vertical supports are detachably connected with bottom beams and first inclined beams of the triangular frames respectively, the number of the vertical supports is one or a plurality, and the plurality of vertical supports are arranged at intervals.

6. The pierless river cofferdam of claim 5, wherein The number of the transverse supports is a plurality, and the plurality of transverse supports are connected with the first inclined beams, the second inclined beams and the bottom beams of the triangular frames respectively.

7. The pierless river cofferdam of claim 6, wherein The number of the inclined supports of the triangular frames is less than the number of the transverse supports connected with the bottom beams of the triangular frames, and the bottom ends of the inclined supports of the triangular frames are detachably connected with one transverse support.

8. The pierless river cofferdam of claim 7, wherein The beams and the supports of the triangular frames are connected by rotating fasteners. The utility model provides a river cofferdam frame, which comprises a plurality of triangular frames, the triangular frames are sequentially and detachably connected by three profile steels, the plurality of triangular frames are arranged in parallel and are detachably connected by transverse supports, the triangular frames are provided with inclined supports, two ends of the inclined supports are detachably connected with bottom beams and first inclined beams of the triangular frames respectively, the inclined supports are parallel to second inclined beams of the triangular frames, the number of the inclined supports is one or a plurality, and the plurality of inclined supports are arranged at intervals, the triangular frames are provided with vertical supports, two ends of the vertical supports are detachably connected with bottom beams and first inclined beams of the triangular frames respectively, the number of the vertical supports is one or a plurality, and the plurality of vertical supports are arranged at intervals. The number of the transverse supports is a plurality, and the plurality of transverse supports are connected with the first inclined beams, the second inclined beams and the bottom beams of the triangular frames respectively. The number of the inclined supports of the triangular frames is less than the number of the transverse supports connected with the bottom beams of the triangular frames, and the bottom ends of the inclined supports of the triangular frames are detachably connected with one transverse support. The beams and the supports of the triangular frames are connected by rotating fasteners. The utility model provides a river cofferdam frame, which comprises a plurality of triangular frames, the triangular frames are sequentially and detachably connected by three profile steels, the plurality of triangular frames are arranged in parallel and are detachably connected by transverse supports, the triangular frames are provided with inclined supports, two ends of the inclined supports are detachably connected with bottom beams and first inclined beams of the triangular frames respectively, the inclined supports are parallel to second inclined beams of the triangular frames, the number of the inclined supports is one or a plurality, and the plurality of inclined supports are arranged at intervals, the triangular frames are provided with vertical supports, two ends of the vertical supports are detachably connected with bottom beams and first inclined beams of the triangular frames respectively, the number of the vertical supports is one or a plurality, and the plurality of vertical supports are arranged at intervals. The number of the transverse supports is a plurality, and the plurality of transverse supports are connected with the first inclined beams, the second inclined beams and the bottom beams of the triangular frames respectively. The number of the inclined supports of the triangular frames is less than the number of the transverse supports connected with the bottom beams of the triangular frames, and the bottom ends of the inclined supports of the triangular frames are detachably connected with one transverse support. The beams and the supports of the triangular frames are connected by rotating fasteners. The utility model provides a river cofferdam frame, which comprises a plurality of triangular frames, the triangular frames are sequentially and detachably connected by three profile steels, the plurality of triangular frames are arranged in parallel and are detachably connected by transverse supports, the triangular frames are provided with inclined supports, two ends of the inclined supports are detachably connected with bottom beams and first inclined beams of the triangular frames respectively, the inclined supports are parallel to second inclined beams of the triangular frames, the number of the inclined supports is one or a plurality, and the plurality of inclined supports are arranged at intervals, the triangular frames are provided with vertical supports, two ends of the vertical supports are detachably connected with bottom beams and first inclined beams of the triangular frames respectively, the number of the vertical supports is one or a plurality, and the plurality of vertical supports are arranged at intervals. The number of the transverse supports is a plurality, and the plurality of transverse supports are connected with the first inclined beams, the second inclined beams and the bottom beams of the triangular frames respectively. The number of the inclined supports of the triangular frames is less than the number of the transverse supports connected with the bottom beams of the triangular frames, and the bottom ends of the inclined supports of the triangular frames are detachably connected with one transverse support. The beams and the supports of the triangular frames are connected by rotating fasteners. The utility model provides a river cofferdam frame, which comprises a plurality of triangular frames, the triangular frames are sequentially and detachably connected by three profile steels, the plurality of triangular frames are arranged in parallel and are detachably connected by transverse supports, the triangular frames are provided with inclined supports, two ends of the inclined supports are detachably connected with bottom beams and first inclined beams of the triangular frames respectively, the inclined supports are parallel to second inclined beams of the triangular frames, the number of the inclined supports is one or a plurality, and the plurality of inclined supports are arranged at intervals, the triangular frames are provided with vertical supports, two ends of the vertical supports are detachably connected with bottom beams and first inclined beams of the triangular frames respectively, the number of the vertical supports is one or a plurality, and the plurality of vertical supports are arranged at intervals. The number of the transverse supports is a plurality, and the plurality of transverse supports are connected with the first inclined beams, the second inclined beams and the bottom beams of the triangular frames respectively. The number of the inclined supports of the triangular frames is less than the number of the transverse supports connected with the bottom beams of the triangular frames, and the bottom ends of the inclined supports of the triangular frames are detachably connected with one transverse support. The beams and the supports of the triangular frames are connected by rotating fasteners. The utility model provides a river cofferdam frame, which comprises a plurality of triangular frames, the triangular frames are sequentially and detachably connected by three profile steels, the plurality of triangular frames are arranged in parallel and are detachably connected by transverse supports, the triangular frames are provided with inclined supports, two ends of the inclined supports are detachably connected with bottom beams and first inclined beams of the triangular frames respectively, the inclined supports are parallel to second inclined beams of the triangular frames, the number of the inclined supports is one or a plurality, and the plurality of inclined supports are arranged at intervals, the triangular frames are provided with vertical supports, two ends of the vertical supports are detachably connected with bottom beams and first inclined beams of the triangular frames respectively, the number of the vertical supports is one or a plurality, and the plurality of vertical supports are arranged at intervals. The number of the transverse supports is a plurality, and the plurality of transverse supports are connected with the first inclined beams, the second inclined beams and the bottom beams of the triangular frames respectively. The number of the inclined supports of the triangular frames is less than the number of the transverse supports connected with the bottom beams of the triangular frames, and the bottom ends of the inclined supports of the triangular frames are detachably connected with one transverse support. The beams and the supports of the triangular frames are connected by rotating fasteners. The utility model provides a river cofferdam frame, which comprises a plurality of triangular frames, the triangular frames are sequentially and detachably connected by three profile steels, the plurality of triangular frames are arranged in parallel and are detachably connected by transverse supports,

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