CN210766939U - Hydraulic flushing, digging, reaming and sucking equipment for inner support foundation pit engineering - Google Patents

Abstract

The utility model provides a water conservancy is washed and is dug hank and inhale equipment for interior support foundation ditch engineering, water conservancy is washed and is dug hank and inhale equipment and include the mobile jib, power device, biax hank native device still includes the suction dredge of nestification in the mobile jib to and set up in the mobile jib both sides, insert and extend the high-pressure squirt that inserts the fixed plate from the power device top. The utility model has the advantages that: the utility model discloses simple structure, convenient operation, the simple and convenient and expense of maintenance is low, carries out the weak soil excavation to the foundation ditch engineering that supports in existence, compares efficiency with traditional excavator and shows the promotion, shortens the time limit for a project of earthwork engineering in a large number, reduces the influence that the raise dust brought, solves dregs transportation scheduling problem.

Description

Hydraulic flushing, digging, reaming and sucking equipment for inner support foundation pit engineering

Technical Field

The utility model relates to an earthwork excavation equipment technical field especially relates to a hydroexcavation cutter-suction equipment that is used for having the less foundation ditch engineering in equipment removal space of interior support.

Background

Nowadays, the overground space is close to the saturation, underground space engineering begins to develop rapidly, most of projects all need excavation supporting, especially soft soil deep basal pit all need set up supporting construction, it is narrow and small nevertheless to have arranged the foundation ditch activity space behind the interior support, the normal work of large-scale excavator has greatly been restricted, lead to earthwork excavation speed slow, the earthwork needs auxiliary assembly cargo airplane to transport outside the hole again simultaneously, the time limit will produce the potential safety hazard in the time limit for a project period of having prolonged, and the sediment soil transportation expense is high still receives the time limit simultaneously, in addition, can also produce raise dust and influence the environment, bring many influences for this for the engineering.

There is cutter suction type suction dredge in the field of suction dredge, the main function is to clear up silt and bury the silt at the bottom, is not suitable for the earthwork excavation on the land. Chinese patent, patent No. 201820676270.8 discloses a cutter suction dredger, which is driven by a power device to move two soil taking devices downwards, and a drill bit is additionally provided with a ring plate and a wing plate, so that the soil cutting capability is improved, the soil taking efficiency in a gravel layer and a clay layer is excellent aiming at a large open caisson, and the cutter suction dredger is widely applied to open caisson soil suction sinking engineering. The equipment can only wring and absorb soil bodies with large water content or small strength, and usually arranges a suction dredge by means of a transport ship, and is not suitable for excavating soil bodies of foundation pits on land.

Chinese patent CN207998850 discloses a 'a near-river near-sea foundation pit earthwork hydraulic excavation system', which comprises a hydraulic excavation mechanism and a slurry transportation mechanism. The hydraulic excavation system reduces temporary engineering construction, has short construction period, and is economic and environment-friendly. However, the hydraulic excavation and the slurry transportation are separately carried out, no integrated consideration is provided, and in addition, the excavation efficiency of the system is greatly reduced when the foundation pit soil property is good and the foundation pit area is large.

How to solve the above technical problems is the subject faced by the present invention.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a deep basal pit's hydraulic flushing cutter-suction equipment that is used for construction space narrow and small, especially has the interior support.

The utility model discloses a realize through following measure: the utility model provides a hydraulic flushing, digging, cutter and suction equipment for interior support foundation ditch engineering, includes the mobile jib, connect in power device on mobile jib and the fixed beam, by power device driven biax hank native device, biax hank native device runs through and connects in fixed beam and the fixed plate, the diaxon symmetry of biax hank native device sets up, every biax hank native device all includes hydraulic motor, hydraulic motor bottom axial is connected with by its driven power output shaft, power output shaft is connected with the reamer head, still includes nestification and is in inhale mud pipe in the mobile jib, and set up the mobile jib both sides are followed the power device top is gone into and is extended and insert the high-pressure squirt of fixed plate.

As a further optimization scheme of the hydraulic power excavation, cutter suction equipment for the inner support foundation pit engineering provided by the utility model, each shaft in the double-shaft soil twisting device comprises the hydraulic motor, and the lower end of the hydraulic motor is connected with the fixed beam through a screw; the bottom end of the hydraulic motor is connected with a power output shaft driven by the hydraulic motor, and the power output shaft vertically extends downwards; the reamer head is fixed at the lower end of the power output shaft and is driven by the power output shaft to rotate.

As the utility model provides a hydraulic flushing cutter suction device for inner support foundation pit engineering further optimizes the scheme, the lower part of the reamer head is a double-helix drill bit, the middle part of the reamer head is provided with a plurality of reamer teeth, the reamer teeth are spirally distributed, and grooves are arranged between the reamer teeth along the generatrix direction of the reamer head; the upper portion is the pterygoid lamina, the pterygoid lamina is that four mutual perpendicularis, and the cross-section is trapezoidal steel sheet constitution narrow from top to bottom, by outer solid fixed ring welded fastening together between the pterygoid lamina.

As the utility model provides a pair of hydraulic flushing cutter suction equipment further optimization scheme for interior support foundation ditch engineering, the mobile jib is hollow thin wall steel pipe, and the upper end inner wall is equipped with the screw thread, and available screw sleeve increases the length of mobile jib, screw sleeve does the suction dredge nestification in the mobile jib, suction dredge upper segment exit end is connected with the dredge pump, and the lower extreme passes fixed plate certain length and nevertheless does not reach reamer head horizontal position, its end connection has the suction dredge mouth.

As a further optimization scheme of the hydraulic power excavation and cutter suction equipment for the inner support foundation pit engineering provided by the utility model, the suction nozzle is connected at the inlet at the bottom end of the suction pipe, the inlet at the lower end of the suction nozzle is in a cone frustum shape, and a grid baffle is arranged in the suction nozzle; the grid baffle can prevent broken stones from entering the mud suction pipe.

As a further optimization scheme of the hydraulic power punching, cutting and suction equipment for the inner support foundation pit engineering provided by the utility model, the high-pressure water gun is arranged on two sides of the main rod, the upper inlet end is connected with the high-pressure water pump, the middle part is fixed with the power device through a lock catch, and the lower end passes through the fixing plate and is clamped in the U-shaped groove and is higher than the horizontal position of the mud suction nozzle; the lower end of the water pressing gun penetrates through the fixing plate and is clamped in the U-shaped groove for a certain length, but the lower end of the water pressing gun is higher than the horizontal position of the mud suction nozzle.

As the utility model provides a pair of hydraulic flushing and digging cutter suction equipment further optimization scheme for interior support foundation ditch engineering, biax cutter native device runs through in proper order the fixed beam with the fixed plate, with the mobile jib is connected, the fixed beam with the fixed plate weld in on the mobile jib.

Furthermore, the hydroexcavation cutter-suction equipment also comprises two balancing weights which are symmetrically clamped on two sides of the main rod and are sequentially and upwards stacked by taking the fixing plate as the bottom surface.

In order to better realize the utility model discloses an object, the utility model also provides an use method of support foundation ditch engineering's hydroexcavation cutter-suction equipment, including following step:

1) removing impurities such as filling soil on the surface layer of the foundation pit through mechanical excavation, and excavating to the bottom surface of the first inner support;

2) a first concrete inner support is poured, bolts are reserved, downward excavation is continued for 2m, and an I-shaped steel rail and an electric hoist are installed;

3) hoisting and arranging hydraulic flushing, digging and suction equipment to enter a field by using the electric hoist in the step 2);

4) the excavation construction adopts the excavation sequence of firstly central excavation and then peripheral excavation, hydraulic excavation is used for downward excavation to the bottom surface of the next support, the next concrete inner support is poured, bolts are reserved, downward excavation is continued for 2m, and an electric hoist and hydraulic excavation cutter suction equipment are installed; and analogizing, stopping using hydraulic excavation until the position of the excavation is 0.3m away from the base, and finishing by manually cleaning the base.

In the step 4), the excavation construction adopts an excavation mode of firstly central excavation and then peripheral excavation and follows the principle of layered, uniform and symmetrical excavation.

The utility model has the advantages that:

(1) the utility model discloses simple structure, convenient operation, the simple and convenient and expense of maintenance is low, carries out the weak soil excavation to the foundation ditch engineering that supports in existence, compares efficiency with traditional excavator and shows the promotion, shortens the time limit for a project of earthwork engineering in a large number, reduces the influence that the raise dust brought, solves dregs transportation scheduling problem.

(2) The utility model adopts the double-shaft soil-mincing device to synchronously operate, the reamer head is divided into four functional areas, and the lower part is a double-helix drill bit which can drill and mince hard soil layers; a plurality of reamer teeth in the middle are protruded and spirally distributed around the surface of the reamer head in a rising way, so that soil can be effectively ground, the excavation area is enlarged, and the soil is ground to the upper part of the reamer head; grooves are carved between the reamer teeth along the direction of the generatrix, which is beneficial to preventing soil or fillers from blocking the reamer teeth; the upper portion is the pterygoid lamina, and the pterygoid lamina cross-section is trapezoidal, and the soil mixing water that will twist up continues to stir into mud, and the design of trapezoidal cross-section not only increases the resistance to deformation ability of pterygoid lamina but also can give the vertical component of earth constantly when the stirring with the earth push away to the upper strata, makes it be close to the suction tube, and the pterygoid lamina of large tracts of land can increase the area of contact with soil in addition and improve the hank native efficiency, finally cooperates equipment to realize the punching, digging, hank and inhale the function.

(3) The utility model discloses well suction dredge and high-pressure squirt are with equipment integration, can wash simultaneously and dig the cutter and inhale, and to a great extent has simplified the complexity of construction, can combine to improve work efficiency and application scope with the method of inhaling with the cutter the method of digging.

(4) The utility model discloses well adoption hydraulic motor, the rotational speed is low, can directly be connected with operating device, does not need decelerator, makes drive mechanism simplify greatly, and low-speed hydraulic motor's output torque is great.

(5) The utility model discloses well adoption threaded sleeve increases equipment mobile jib length, easy operation, suitability height.

(6) The utility model discloses well adoption can replace the suction dredge mouth, and the built-in net baffle of suction dredge mouth can prevent that bold rubble or hard clod from getting into the suction dredge, guarantees suction dredge normal operating.

(7) The utility model discloses well equipment of adopting is light, can be in the operation of any position of foundation ditch, and the work progress can control the region that soaks, reduces the improvement of soil body water content in the hole as far as possible.

(8) The utility model discloses noise and the poplar dirt in the work progress are all smaller, need not the energy-concerving and environment-protective of earthwork transportation.

(9) The method used in the utility model can obviously improve the mechanization degree of the foundation pit earthwork excavation in the soft soil field, has high excavation efficiency, can continuously work for 24 hours, and can obviously shorten the construction period of the earthwork excavation; in addition, the construction cost is greatly reduced compared with the conventional method.

Drawings

FIG. 1 is a front view of the structure of the embodiment of the present invention;

fig. 2 is a left side view of the structure of the embodiment of the present invention;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 4 is an enlarged partial schematic view at B of FIG. 1;

FIG. 5 is a front view at B of FIG. 1;

FIG. 6 is a view taken along line C of FIG. 5;

FIG. 7 is a view from direction D of FIG. 5;

FIG. 8 is a schematic structural view of a mud suction nozzle in an embodiment of the present invention;

FIG. 9 is a front view of a threaded bushing in an embodiment of the present invention;

fig. 10 is a schematic view of an assembly structure of the hydroexcavation equipment and the foundation pit inner support in the embodiment of the present invention;

wherein the reference numerals are: 1. a main rod; 2. a power plant; 3. a hydraulic motor; 4. a power take-off shaft; 5. a fixing plate; 6. a mud suction pipe; 6-1, a mud suction nozzle; 7. a high pressure water gun; 8. a reamer head; 8-1, a double-helix drill bit; 8-2, reamer teeth; 8-3, wing plates; 8-4, a groove; 8-5, an outer fixing ring; 9. a fixed beam; 10. locking; 11. a U-shaped groove; 12. a threaded bushing; 13. an electric hoist; 14. an I-steel rail; 15. and (4) inner supporting.

Detailed Description

In order to clearly illustrate the technical features of the present solution, the present solution is explained below by way of specific embodiments.

Referring to fig. 1 to 10, the present invention is: the utility model provides a hydraulic flushing and digging cutter suction equipment for interior support foundation ditch engineering, including mobile jib 1, connect power device 2 on mobile jib 1 and fixed beam 9, by 2 driven biax hank native device of power device, biax hank native device runs through and connects in fixed beam 9 and fixed plate 5, the diaxon symmetry of biax hank native device sets up, every biax hank native device all includes hydraulic motor 3, hydraulic motor bottom axial is connected with by its driven power output shaft 4, power output shaft 4 is connected with reamer head 8, still include the mud pipe 6 of inhaling of nestification in mobile jib 1, and set up in 1 both sides of mobile jib, insert and extend the high-pressure squirt 7 that inserts fixed plate 5 from 2 tops of power device.

Specifically, each shaft in the double-shaft soil twisting device comprises a hydraulic motor 3, and the lower end of the hydraulic motor 3 is connected with a fixed beam 9 through a screw; the bottom end of the hydraulic motor 3 is connected with a power output shaft 4 driven by the hydraulic motor, and the power output shaft 4 vertically extends downwards; the reamer head 8 is fixed at the lower end of the power output shaft 4 and is driven to rotate by the power output shaft 4.

Specifically, the lower part of the reamer head 8 is provided with a double-helix drill bit 8-1, the middle part of the reamer head is provided with a plurality of reamer teeth 8-2, the reamer teeth 8-2 are spirally distributed, and grooves 8-4 are arranged among the reamer teeth 8-2 along the generatrix direction of the reamer head 8; the upper part is a wing plate 8-3, the wing plate 8-3 is composed of four steel plates which are mutually vertical and have trapezoidal sections and narrow upper parts and wide lower parts, and the wing plates 8-3 are welded and fixed together by an outer fixing ring 8-5;

the maximum diameter of the reamer head 8 is 50cm, the reamer head 8 is divided into a lower part, a middle part and an upper part, and the lower part is a double-helix drill 8-1 and 5cm high; the middle part is provided with reamer teeth 8-2, the reamer teeth are spirally distributed and form a group of reamer teeth 8-2 at every 45 degrees, each group of upper and lower reamer teeth 8-2 are provided, and grooves 8-4 with the width of 2cm and the depth of 0.5cm are arranged between the reamer teeth 8-2 along the generatrix direction of the reamer head 8; the upper part is a wing plate 8-3, the wing plate 8-3 is four steel plates which are mutually vertical and have trapezoidal sections, the upper width is 1.5cm, and the lower width is 5 cm.

The working principle of the reamer head 8 is as follows: the double-helix drill bit 8-1 at the lower part can easily drill into a hard soil layer; the cutter teeth 8-2 spirally distributed in the middle part can enlarge the excavation area, and simultaneously primarily grind and push soil to the upper part of the cutter head 8; the upper wing plate 8-3 continuously stirs the twisted soil mixed water into mud, the arrangement of the trapezoidal section not only increases the anti-deformation capability of the wing plate 8-3, but also can continuously push the stirred mud to the upper layer when the vertical component force of the mud is stirred, so that the mud is close to the mud suction pipe 6, and finally the functions of punching, digging, twisting and sucking are realized by matching with equipment; the groove 8-4 may effectively prevent the reamer 8-2 from being blocked by the filler.

Specifically, the main rod 1 is a hollow thin-wall steel pipe, the inner wall of the upper end of the main rod is provided with threads, the length of the main rod 1 can be increased by using a threaded sleeve 12, the threaded sleeve 12 is a mud suction pipe 6 which is nested in the main rod 1, the outlet end of the upper section of the mud suction pipe 6 is connected with a mud suction pump, namely, the lower end of the mud suction pipe passes through the fixed plate 5 for a certain length but does not reach the horizontal position of the reamer head 8, the lower end of the mud suction pipe passes through the fixed plate 5 and is lower than the horizontal; wherein, the main rod 1 is the outer diameterA hollow thin-wall steel pipe with the diameter of 22cm and the inner diameter of 18.5cm, a mud suction pipe 6 with the diameter of 18cm is nested in the main rod 1, the outlet end of the uppermost end of the mud suction pipe 6 is connected with a mud suction pump, the lower end of the mud suction pipe penetrates through the fixed plate 5 for a certain length but does not reach the horizontal position of the reamer head 8, the tail part of the mud suction pipe is connected with a mud suction nozzle 6-1, the mud suction pump adopts NL125-20.0, the³H, the flying length is 20m, and the matching power is 22 kw.

Specifically, the mud suction nozzle 6-1 is connected with the inlet at the bottom end of the mud suction pipe 6, the inlet at the lower end of the mud suction pipe is in a cone frustum shape, and a grid baffle is arranged in the mud suction nozzle; the grid baffle prevents debris from entering the suction pipe 6. Wherein, the inlet at the lower end of the mud suction nozzle 6-1 is in a cone frustum shape with the height of 2cm, the built-in grid baffle is a rectangular body with the length of 2cm multiplied by 2cm, and the grid baffle can effectively prevent broken stones from entering the mud suction pipe 6.

Specifically, the high-pressure water guns 7 are arranged on two sides of the main rod 10, the inlet end of the upper section is connected with the high-pressure water pump, the middle part is fixed with the power device 2 through the lock catch 10, and the lower end penetrates through the fixed beam 9 to be clamped in the U-shaped groove 11 and is higher than the horizontal position of the mud suction nozzle 6-1; namely, the lower end of a high-pressure water gun 7 passes through a fixed beam 9 and is clamped in a U-shaped groove 11 for a certain length but is higher than the horizontal position of a mud suction nozzle 6-1, a high-pressure water pump selects 3BP-57 with the flow rate of 50m³H, the flying length is 57m, and the matching power is 15 kw.

The balance weight is characterized by further comprising two symmetrical balance weight blocks, wherein the two balance weight blocks are clamped on two sides of the main rod 1 and are sequentially upwards stacked by taking the fixing plate 5 as a bottom, the length of each balance weight block is 35cm, the width of each balance weight block is 17cm, the thickness of each balance weight block is 10cm, and the hollow part of the inner side of each balance weight block is a semicircle with the.

Still include external diameter 22cm, many threaded sleeve pipes of length 1m, end to end connects gradually and is used for increasing equipment mobile jib 1 length, easy operation, suitability height.

Specifically, the biax hank native device runs through fixed beam 9 and fixed plate 5 in proper order, is connected with mobile jib 1, and fixed beam 9 welds on mobile jib 1 with fixed plate 5 to provide and bear the vertical holding power of hank native device dead weight and impact counter-force.

In order to better realize the utility model discloses an object, the utility model also provides an use method of support foundation ditch engineering's hydroexcavation cutter-suction equipment, including following step:

1) removing impurities such as filling soil on the surface layer of the foundation pit through mechanical excavation, and excavating to the bottom surface of the first inner support 15;

2) pouring a first concrete inner support 15, reserving bolts, continuously excavating for 2m downwards, and installing an I-shaped steel rail 14 and an electric hoist 13;

3) hoisting and arranging hydraulic flushing, excavating, cutter-suction equipment to enter a field by using the electric hoist 13 in the step 2);

4) the excavation construction adopts the excavation sequence of firstly central excavation and then peripheral excavation, hydraulic excavation is used for downward excavation to the bottom surface of a lower channel support, a next concrete inner support 15 is poured, a bolt is reserved, downward excavation is continued for 2m, and an electric hoist 13 and hydraulic excavation cutter suction equipment are installed; and analogizing, stopping using hydraulic excavation until the position of the excavation is 0.3m away from the base, and finishing by manually cleaning the base.

The utility model provides a pair of support foundation ditch engineering's hydroexcavation cutter suction equipment's application method specifically mainly includes following content:

1) excavating a surface soil body: removing impurities such as filling soil on the surface layer of the foundation pit through mechanical excavation, and excavating to the bottom surface of the first concrete inner support 15;

2) the construction of the first concrete inner support and the installation of the I-steel rail 14 of the CD1 type electric hoist 13 are as follows: an I-steel additional load 205kN/m-479kN/m required by the inner support 15 is arranged on the inner support, a bolt is required to be reserved when the inner support 15 is constructed, the I-steel rail 14 is fixedly connected with the inner support 15 through the bolt, and then the electric hoist 13 is installed and deployed into a digging device to enter a field;

3) laying a pipeline: the conveying pipeline is laid along a flat land area, the pipeline is flat and straight, the bending is required to be gentle, and dead bending is avoided; the mud discharge pipe joint is tightly fastened, so that mud and water cannot leak from the whole pipeline and joint, and the whole pipeline and joint are repaired or replaced in time when leakage is found; the mud pipe fixing support is firm and reliable and cannot be inclined or shaken;

4) workload arrangement: the mud flow of a single hydraulic excavating device is 200m³The maximum daily work load of each device is 800m calculated by taking mud and water as 1: 5³(ii) a Arranging the number of the hydraulic excavation equipment and the hydraulic excavation working time according to the actual situation of the site and the planning arrangement of the construction progress, and ensuring the foundation pitThe earth excavation is continuously and effectively carried out;

5) and (3) hydraulic excavation construction: excavating downwards to the bottom surface of a lower support by using hydraulic excavation, pouring a next concrete inner support, reserving bolts for installing an I-shaped steel track, continuously excavating downwards for 2m, installing an electric hoist and excavation equipment, wherein the excavation equipment uses the electric hoist to perform moving construction in a foundation pit through the I-shaped steel track, and directly pumping water from a water source (a river channel or a tap water pipe) by using the excavation equipment for excavation; the method comprises the steps that the dug slurry is pumped out by a slurry suction pipe fixed on equipment and is transported to a temporary slurry pool beside a foundation pit through a pipeline to be primarily precipitated, then the slurry is transported to a slurry ship at a river dock through the pipeline, secondary precipitation is carried out in the slurry ship to further reduce the water content of the slurry, the slurry ship is transported to a soil abandoning area after being fully loaded, the dug construction adopts an excavation mode of firstly central excavation and then surrounding excavation, the soaking time around the foundation pit is reduced as much as possible according to the excavation principle of layering, uniformity and symmetry, a part of soil body reserved on a slope angle and a slope surface of the foundation pit is manually transported by mechanical cooperation, the hydraulic power excavation is stopped when the foundation pit is excavated to a position 0.3m away from a base, and all the manual excavation is carried out.

The technical features that the utility model has not been described can be realized through or adopt prior art, and no longer give unnecessary details here, and of course, the above-mentioned explanation is not right the utility model discloses a restriction, the utility model discloses also not only be limited to the above-mentioned example, ordinary skilled person in this technical field is in the utility model discloses a change, modification, interpolation or replacement made in the essential scope also should belong to the utility model discloses a protection scope.

Claims (8)

1. A hydraulic power excavation, cutter-suction device for inner support foundation pit engineering is characterized by comprising a main rod (1), a power device (2) connected to the main rod (1) and a fixed beam (9), a double-shaft soil-cutting device driven by the power device (2), the double-shaft soil-twisting device penetrates through and is connected in the fixed beam (9) and the fixed plate (5), the two shafts of the double-shaft soil twisting device are symmetrically arranged, each double-shaft soil twisting device comprises a hydraulic motor (3), the bottom end of the hydraulic motor is axially connected with a power output shaft (4) driven by the hydraulic motor, the power output shaft (4) is connected with a reamer head (8), the hydraulic motor also comprises a mud suction pipe (6) nested in the main rod (1), and the high-pressure water guns (7) are arranged on two sides of the main rod (1) and are connected to the power device (2) from the upper part and extend into the fixing plate (5).

2. The hydroexcavation cutter-suction equipment for the inner support foundation pit project according to claim 1, wherein each shaft in the double-shaft soil-mincing device comprises the hydraulic motor (3), and the lower end of the hydraulic motor (3) is connected with the fixed beam (9) through a screw; the bottom end of the hydraulic motor (3) is connected with a power output shaft (4) driven by the hydraulic motor, and the power output shaft (4) vertically extends downwards; the reamer head (8) is fixed at the lower end of the power output shaft (4) and is driven to rotate by the power output shaft (4).

3. The hydroexcavation cutter-suction device for the inner support foundation pit engineering according to claim 2, wherein the lower part of the cutter head (8) is a double-helix drill bit (8-1), the middle part of the cutter head is provided with a plurality of cutter teeth (8-2), the cutter teeth (8-2) are spirally distributed, and grooves (8-4) are formed among the cutter teeth (8-2) along the generatrix direction of the cutter head (8); the upper part is a wing plate (8-3), the wing plate (8-3) is composed of four steel plates which are mutually vertical and have trapezoidal sections and narrow upper parts and wide lower parts, and the wing plates (8-3) are welded and fixed by an outer fixing ring (8-5).

4. The hydroexcavation cutter-suction device for supporting foundation pit engineering of claim 2, characterized in that the main rod (1) is a hollow thin-walled steel pipe, the inner wall of the upper end of the main rod is provided with threads, a threaded sleeve (12) is connected to the main rod (1), the threaded sleeve (12) is used for nesting the sludge suction pipe (6) in the main rod (1), the outlet end of the upper section of the sludge suction pipe (6) is connected with a sludge suction pump, the lower end of the sludge suction pipe passes through the fixed plate (5) and is lower than the horizontal position of the cutter head (8), and the tail of the sludge suction pipe is connected with a sludge suction nozzle (6-1).

5. The hydroexcavation cutter-suction device for the inner support foundation pit project according to claim 4, wherein the suction nozzle (6-1) is connected to an inlet at the bottom end of the suction pipe (6), the inlet at the lower end of the suction pipe is in a cone frustum shape, and a grid baffle is arranged in the suction nozzle.

6. The hydroexcavation cutter-suction equipment for the inner support foundation pit engineering according to claim 4, wherein the high-pressure water guns (7) are arranged on two sides of the main rod (1), the inlet ends of the upper sections are connected with the high-pressure water pumps, the middle parts of the high-pressure water guns are fixed with the power device (2) through lock catches (10), and the lower ends of the high-pressure water guns penetrate through the fixed beams (9) and are clamped in the U-shaped grooves (11) and are higher than the horizontal positions of the mud suction nozzles (6-1).

7. The hydroexcavation cutter-suction equipment for the inner support foundation pit engineering according to claim 2, wherein the double-shaft soil-twisting device sequentially penetrates through the fixed beam (9) and the fixed plate (5) and is connected with the main rod (1), and the fixed beam (9) and the fixed plate (5) are welded on the main rod (1).

8. The hydroexcavation cutter-suction device for the inner support foundation pit engineering according to claim 1, wherein the hydroexcavation cutter-suction device further comprises two balancing weights, the two balancing weights are symmetrically clamped on two sides of the main rod (1), and the two balancing weights are sequentially stacked upwards by taking the fixing plate (5) as a bottom surface.

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