CN113802627B - Excavation device and excavation method for reserved soil layer at bottom of foundation pit - Google Patents

Abstract

The invention provides a foundation pit bottom reserved soil layer excavation device and a foundation pit excavation method. The device includes: a scraper vehicle; the two sliding rails are respectively arranged on two sides of the vehicle body; the front traction assembly is connected to one of the slide rails in a sliding mode and is connected with the front end of the shovel car; and the rear traction assembly is connected to the other sliding rail in a sliding manner, and the rear traction assembly is connected with the rear end of the scraper truck. According to the invention, the front traction force is applied to the shovel car through the front traction assembly to provide forward power for the shovel car, so that the shovel car moves longitudinally, carries out shoveling on a reserved soil layer while moving, and retreats under the traction action of the rear traction assembly; the front traction assembly and the rear traction assembly can transversely move on the slide rail along the slide rail to drive the scraper to transversely move, so that the soil body within the width range of the pipe gallery is within the working range of the scraper.

Description

Excavation device and excavation method for reserved soil layer at bottom of foundation pit

Technical Field

The invention relates to the technical field of foundation pit construction, in particular to a foundation pit bottom reserved soil layer excavation device and a foundation pit excavation method.

Background

Need carry out the foundation ditch excavation in underground pipe gallery construction process, according to the construction standard, need reserve 150mm to 300 mm's soil layer when adopting mechanical excavation and adopt the clear level of manual excavation, prevent that machinery from over digging or mechanical disturbance basement original state soil. The pipe gallery is generally several kilometers long and several tens of meters wide, and the manual excavation amount is very large.

Firstly, excavating to a designed elevation by using a machine and then clearing by using manpower, thereby easily causing overexcavation or disturbance of undisturbed soil at the bottom of a foundation pit; and secondly, the reserved soil layer is trimmed by manual excavation, the speed is low, the efficiency is low, and the cost is high.

Disclosure of Invention

In view of the above, the invention provides a foundation pit bottom reserved soil layer excavation device and a foundation pit excavation method, and aims to provide a high-efficiency foundation pit bottom reserved soil layer excavation device and a foundation pit excavation method which do not disturb undisturbed soil at the bottom of a foundation pit and are used for a pipe gallery foundation pit.

On one hand, the invention provides a foundation pit bottom reserved soil layer excavation device, which comprises: the shovel is used for excavating the reserved soil layer; the two sliding rails are respectively arranged on two sides of the vehicle body and play a role in longitudinal guiding; the front traction assembly is connected to one of the slide rails in a sliding mode, is connected with the front end of the shovel truck and is used for applying front traction force to the shovel truck so as to provide forward power for the shovel truck; and the rear traction assembly is connected with the rear end of the shovel car in a sliding manner and used for applying rear traction force to the shovel car so as to provide power for backward movement of the shovel car, so that the shovel car moves to the rear end to move from the rear end to the front end again along the longitudinal direction, and further the reserved soil layer is excavated.

Furtherly, soil layer excavation device is reserved to above-mentioned foundation ditch bottom, the scraper truck includes: a vehicle body as a traveling mechanism; the car hopper is rotatably arranged on the car body and used for storing excavated soil; and the turning tool assembly is arranged at the front end of the vehicle body and used for cutting soil bodies of reserved soil layers and extruding and guiding the cut loose soil bodies so as to enable the cut soil bodies to enter the vehicle hopper.

Further, soil layer excavation device is reserved to above-mentioned foundation ditch bottom, the lathe tool subassembly includes: fixing a cutter head; the sliding cutter head is connected to the fixed cutter head in a sliding manner along the length direction of the fixed cutter head and is used for sliding back and forth to cut soil; and the power output end of the driving component is connected with the sliding tool bit and is used for driving the sliding tool bit to slide.

Furthermore, soil layer excavation device is reserved to above-mentioned foundation ditch bottom, it is equipped with the sliding tray to slide on the tool bit along its length direction, be equipped with the connecting piece on the fixed tool bit, wear to locate in the connecting piece slidable the sliding tray.

Furtherly, soil layer excavation device is reserved to above-mentioned foundation ditch bottom, drive assembly includes: a drive motor; the coaxial driving wheel is in transmission connection with an output shaft of the driving motor through a transmission chain; the first end of the connecting rod is hinged to the coaxial driving wheel and used for swinging under the action of rotation of the coaxial driving wheel; the connecting rod is hinged to the second end of the connecting rod, and under the action of the swinging of the connecting rod, the connecting rod drives the sliding cutter head to slide along the length direction of the fixed cutter head.

Furthermore, a soil layer excavating device is reserved at the bottom of the foundation pit, and a forward traction hook is arranged at the front end of the vehicle body and used for hooking a traction steel wire rope of the forward traction assembly so that the vehicle body can move forward under the action of the traction steel wire rope of the forward traction assembly; and/or a backward traction hook is arranged at the rear end of the vehicle body and is used for hooking a traction steel wire rope of the backward traction assembly so as to enable the vehicle body to backward under the action of the traction steel wire rope of the backward traction assembly; and/or a hopper turning hook is arranged on the hopper and used for hooking a traction steel wire rope of the front traction assembly so that the hopper can be turned forwards under the action of the traction steel wire rope.

Furtherly, soil layer excavation device is reserved to above-mentioned foundation ditch bottom, the rear end of automobile body is equipped with the handrail for manual adjustment automobile body direction of advance still is used for manual adjustment the levelness of automobile body is with cooperation control soil cutting degree of depth.

Further, above-mentioned foundation ditch bottom is reserved soil layer excavation device, preceding traction assembly and/or back traction assembly includes: the sliding base is connected to the sliding rail in a sliding mode; the winch is arranged on the sliding base, and a traction steel wire rope of the winch is connected to the front end or the rear end of the shovel car.

Furthermore, a soil layer excavating device is reserved at the bottom of the foundation pit, a protrusion is arranged on the guide rail along the length direction of the guide rail, and a groove matched with the protrusion is formed in the sliding base; and/or, a groove is formed in the guide rail along the length direction of the guide rail, and a protrusion matched with the groove is arranged on the sliding base.

On the other hand, the invention also provides a foundation pit excavation method, which comprises the following steps: excavating an upper soil layer of the foundation pit by adopting an earth excavation machine, and excavating to a boundary between the upper soil layer and the reserved soil layer to expose the reserved soil layer at the bottom of the foundation pit; the distance between the boundary between the upper soil layer and the reserved soil layer and the foundation pit bottom elevation of the foundation pit is 150 mm-300 mm; and adopting the reserved soil layer excavating device at the bottom of the foundation pit to excavate and excavate the reserved soil layer to the elevation at the bottom of the foundation pit.

The invention provides a foundation pit bottom reserved soil layer excavation device and a foundation pit excavation method.A front traction force is applied to a soil shoveling vehicle through a front traction assembly to provide forward power for the soil shoveling vehicle, so that the soil shoveling vehicle longitudinally moves, shovels soil on a reserved soil layer while moving, and retreats under the traction action of a rear traction assembly, namely the soil shoveling vehicle longitudinally moves under the traction of the front traction assembly and the rear traction assembly; the front traction assembly and the rear traction assembly can also transversely move on the slide rail along the slide rail to drive the scraper to transversely move, so that the soil body within the width range of the pipe gallery is within the working range of the scraper; reserve the soil layer excavation device through this foundation ditch bottom and excavate reserving the soil layer, the excavation face levels and does not need the large tracts of land to be maintained, can improve the efficiency of digging of reserving the soil layer, and control excavation degree of depth prevents to overexcavate, prevents to disturb the original state soil below the foundation ditch design elevation, provides an efficient not to disturb the piping lane foundation ditch bottom of foundation ditch bottom original state soil and reserves soil layer excavation device and foundation ditch excavation method bottom the foundation ditch promptly.

Drawings

Various additional advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

fig. 1 is a flow chart of a foundation pit excavation method according to an embodiment of the present invention;

fig. 2 is a cross sectional view of a foundation pit soil layer provided by an embodiment of the invention;

fig. 3 is a longitudinal sectional view of a foundation pit soil layer provided in an embodiment of the present invention;

fig. 4 is a top view of the excavation device for the reserved soil layer at the bottom of the foundation pit provided by the embodiment of the invention;

fig. 5 is a side view of an excavation device for a reserved soil layer at the bottom of a foundation pit, which is provided by the embodiment of the invention;

FIG. 6 is a schematic structural view of a power shovel according to an embodiment of the present invention;

FIG. 7 is an enlarged partial view of a head portion of a power shovel provided in accordance with an embodiment of the present invention;

FIG. 8 is a schematic view of an arrangement between a fixed cutter head and a sliding cutter head provided by an embodiment of the present invention;

FIG. 9 is a rear view of a turning tool assembly provided by an embodiment of the present invention;

fig. 10 is a schematic structural diagram between a slide rail and a traction assembly according to an embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

Referring to fig. 1, it is a flow chart of a foundation pit excavation method provided in an embodiment of the present invention. As shown, the method comprises the following steps:

step S1, excavating the upper soil layer of the foundation pit by adopting an earth excavation machine, and excavating to the boundary between the upper soil layer and the reserved soil layer to expose the reserved soil layer at the bottom of the foundation pit; the distance between the boundary between the upper soil layer and the reserved soil layer and the foundation pit bottom elevation of the foundation pit is 150 mm-300 mm.

Specifically, as shown in fig. 2 and fig. 3, the foundation pit soil layer may be sequentially divided into an upper soil layer T1 and a reserved soil layer T2 from an original terrace line a-a to a foundation pit bottom elevation B-B, from top to bottom, according to the construction specification. Firstly, excavating an upper soil layer T1 of the foundation pit by using an earth excavation machine according to construction specifications to a position 150mm to 300mm above the bottom elevation 31 of the foundation pit, and exposing a reserved soil layer T2. As shown in fig. 2, a supporting structure 10 may be provided around the soil layer of the foundation pit to protect the foundation pit and prevent the surrounding soil layer from falling down during excavation.

And S2, excavating the reserved soil layer by adopting the reserved soil layer excavating device at the bottom of the foundation pit and excavating to the elevation of the bottom of the foundation pit.

Specifically, the reserved soil layer T2 can be excavated by the reserved soil layer excavating device at the bottom of the foundation pit and excavated to the bottom elevation 31 of the foundation pit, so that the excavation of the foundation pit is completed.

Referring to fig. 4, a schematic structural diagram of the excavation device for the reserved soil layer at the bottom of the foundation pit according to the embodiment of the present invention is shown. As shown, the excavating device includes: the soil shoveling machine comprises a soil shoveling vehicle 1, two sliding rails 2, a front traction assembly 3 and a rear traction assembly 4; wherein, the first and the second end of the pipe are connected with each other,

the scraper truck 1 is used for excavating a reserved soil layer T2; the two slide rails 2 are respectively arranged at two sides of the shovel car 1 and play a role in longitudinal (horizontal direction as shown in fig. 4) guiding; the front traction assembly 3 is slidably connected to one of the slide rails 2 (the right slide rail 2 shown in fig. 4), and the front traction assembly 3 is connected to the front end (the right end shown in fig. 4) of the scraper truck 1, and is used for applying front traction force to the scraper truck 1 to provide power for advancing the scraper truck 1; the rear traction assembly 4 is slidably connected to another slide rail 2 (the left slide rail 2 shown in fig. 4), and the rear traction assembly 4 is connected to the rear end (the left end shown in fig. 4) of the shovel car 1 for applying a rear traction force to the shovel car 1 to provide a backward power to the shovel car 1, so that the shovel car 1 moves to the rear end to move from the rear end (the left end shown in fig. 4) to the front end (the right end shown in fig. 4) in the longitudinal direction (the horizontal direction shown in fig. 4) again, thereby excavating a reserved soil layer.

In specific implementation, when the forklift 1 works, the front traction assembly 3 pulls the forklift 1, so that the forklift 1 moves from the left side to the right side shown in fig. 3, carries out soil shoveling on the reserved soil layer T2 while moving, and can make the forklift 1 retreat from the right side shown in fig. 3, namely the end C, namely move to the right side, namely move to the end D, namely the forklift 1 longitudinally moves under the traction of the front traction assembly 3 and the rear traction assembly 4 under the traction action of the rear traction assembly 4; the front traction assembly 3 and the rear traction assembly 4 can also move transversely (in the vertical direction as shown in fig. 4) on the slide rail 2 along the slide rail 2 to drive the scraper shovel 1 to move transversely, so that soil in the width range of the pipe rack is within the working range of the scraper shovel 1. Reserve the soil layer excavation method according to this piping lane foundation ditch bottom, the excavation face levels and does not need the large tracts of land to be maintained, can improve the efficiency of digging of reserving the soil layer, and the control excavation degree of depth prevents to surpass digs, prevents to disturb undisturbed soil below the foundation ditch design elevation.

In this embodiment, the slide rail 2 may be fixed to the ground or work surface by means of anchor piles 5, as shown in fig. 5. The anchor piles 5 may be inserted into both ends (left and right ends as shown in fig. 2) of the reserved soil layer T2 in the longitudinal direction of the pipe gallery, and the slide rails 2 may be fixedly installed on the tops of the anchor piles 5 by bolts.

Referring to fig. 5 to 7, preferred structures of the excavation device for the reserved soil layer at the bottom of the foundation pit according to the embodiment of the invention are shown. As shown in the drawings, the shovel 1 includes: the device comprises a vehicle body 11, a hopper 12 and a turning tool assembly 13; wherein, the first and the second end of the pipe are connected with each other,

the bottom of the vehicle body 11 is provided with a track wheel 14, and the track wheel 14 is used as a traveling mechanism. Specifically, as shown in fig. 5 to 6, the vehicle body 11 may be a horizontally disposed floor structure, and plays a supporting role; crawler wheels 14 are arranged on two sides (the upper side and the lower side shown in fig. 6) of the bottom of the vehicle body 11, and the crawler wheels 14 increase the contact area between the shovel truck 1 and a reserved soil layer, reduce the pressure intensity, and reduce the disturbance of the movement of the shovel truck 1 to the soil layer. In order to adjust the moving direction of the vehicle body 11 and the depth of the excavated soil, preferably, the vehicle body 11 may be provided with a handrail 16, and the handrail 16 may be fixed to a rear portion (right end as shown in fig. 5) of the vehicle body 11 by welding to adjust the moving direction of the vehicle body 11 and the levelness of the vehicle body 11, so as to control the depth of the excavated soil by adjusting the levelness.

The hopper 12 is rotatably provided on the vehicle body 11 for storing excavated soil to transport the excavated soil to another location as a whole. Specifically, as shown in fig. 5, the right end of the hopper 12 is rotatably connected to the top wall of the vehicle body 11 so as to be turned forward and turned to the dotted line position shown in fig. 5 for soil discharge of the soil in the hopper 12. As shown in fig. 7, the car hopper 12 and the car body 11 can be rotatably connected through the hinge 15, two hinge plates 151 of the hinge 15 are hinged through a hinge rotating shaft 152, and the two hinge plates 151 are respectively welded on the car hopper 12 and the car body 11, so that the car hopper 12 can be turned forwards around the hinge rotating shaft 152 under the action of traction force. In this embodiment, the car hopper 12 is provided with a hopper turning hook 121 for hooking the traction wire rope of the front traction assembly 3, so that the car hopper 12 is turned forward under the action of the traction wire rope. In this embodiment, the traction cable of the front traction assembly 3 may be provided with an anti-drop hook (not shown), which may be hooked on the forward traction hook 111 or the hopper turning hook 121 to provide forward pulling power and turning power in a switching manner.

The turning tool assembly 13 is disposed at the front end (right end as shown in fig. 5) of the vehicle body 11, and is configured to cut soil of a reserved soil layer, and extrude and guide the cut loose soil, so that the cut soil enters the vehicle hopper 12. Specifically, the turning tool assembly 13 is disposed at the front end of the vehicle body 11 to cut soil layers when the vehicle body 11 moves, and soil bodies which are cut loose during the moving process enter the vehicle hopper 12 under the extrusion action of the soil. In order to avoid the turning tool assembly 13 from cutting the soil too deeply, preferably, the vehicle body 11 is provided with depth control plates 17 on both sides of the turning tool assembly 13 for pushing against the soil layer to control the excavation depth of the tool bit assembly 13, so as to avoid the vehicle body 11 from inclining to cause the turning tool assembly 13 to cut the soil too deeply. In the present embodiment, as shown in fig. 7, a tool bit mounting plate 18 is disposed on the vehicle body 11 for supporting the turning tool assembly 13; the bit mounting plate 18 is tiltably provided at the front end, i.e., the head, of the vehicle body 11, so that the turning tool assembly 13 is tiltably provided to cut the soil layer by inserting the cutting end (the front end as shown in fig. 7) of the turning tool assembly 13 into the soil layer. Wherein, the turning tool assembly 13 can be an electric tool bit.

In the present embodiment, as shown in fig. 7, a front end (a right end as shown in fig. 7) of the vehicle body 11 is provided with a forward towing hook 111 for hooking a towing wire rope of the front towing assembly 3, so that the vehicle body 11 is moved forward, i.e. moved rightward under the action of the towing wire rope of the front towing assembly 3; and/or, a backward drawing hook 112 is provided at the rear end (left end as shown in fig. 7) of the vehicle body 11 for hooking the drawing wire rope of the rear drawing assembly 4, so that the vehicle body 11 can move backward, i.e. to the left, under the action of the drawing wire rope of the rear drawing assembly 4, and can also move laterally under the action of the front drawing assembly 3 and the rear drawing assembly 4. The forward towing hook 111 and the backward towing hook 112 can be fixed to the vehicle body 11 by welding, so that the towing wire rope can be hooked to the forward towing hook 111 and the backward towing hook 112 by the anti-drop hook.

With continued reference to fig. 7-9, the turning tool assembly 13 includes: a fixed cutter 131, a sliding cutter 132, and a driving assembly 133; wherein the sliding cutter head 132 is slidably coupled to the fixed cutter head 131 in a length direction (a horizontal direction as shown in fig. 8 and 9) of the fixed cutter head 131 for reciprocating sliding to cut the soil; the power output end of the driving assembly 133 is connected to the sliding blade 132 for driving the sliding blade 132 to slide.

Specifically, the fixed cutter head 131 may be disposed above the cutter head mounting plate 18 with a certain gap between the fixed cutter head 131 and the cutter head mounting plate 18, and the sliding cutter head 132 may be slidably interposed between the cutter head mounting plate 18 and the fixed cutter head 131; in this embodiment, as shown in fig. 9, the sliding blade 132 is provided with a sliding groove 1322 along the length direction thereof, the fixed blade 131 is provided with a connecting member 134, the connecting member 134 is slidably inserted into the sliding groove 1322, two ends (upper and lower ends shown in fig. 9) of the connecting member 134 are respectively connected to the fixed blade 131 and the blade mounting plate 18, and the middle thereof is inserted into the sliding groove 1322 and can slide relative to the sliding groove 1322. The power output end of the drive assembly 133 is connected to the sliding cutter head 132 for driving the sliding cutter head 132 to slide so that the sliding cutter head 132 can cut soil in a laterally reciprocating motion (perpendicular to the plane of the paper as shown in fig. 7). Wherein the connector 134 may be a flat head bolt for attachment to the fixed cutter head 131 and the sliding cutter head 132 to the cutter head mounting plate 18.

In this embodiment, the electric sliding tool bit is adopted to improve the soil cutting efficiency of the turning tool assembly 13, and is particularly suitable for the situation that the soil quality of the reserved soil layer is hard and the resistance is large when a common flat knife is used for cutting.

With continued reference to fig. 7 and 9, the drive assembly 133 includes: a driving motor 1331, a coaxial driving wheel 1332, a connecting rod 1333 and a connecting block 1334; wherein, the coaxial driving wheel 1332 is in transmission connection with the output shaft of the driving motor 1331 through a transmission chain 1335; a first end (right end as shown in fig. 9) of the connecting rod 1333 is hinged on the coaxial driving wheel 1332 and is used for swinging under the action of the rotation of the coaxial driving wheel 1332; the connecting block 1334 is disposed on the sliding tool head 132, and a second end (a left end as viewed in fig. 9) of the connecting rod 1333 is hinged to the connecting block 1334, so that the connecting block 1334 drives the sliding tool head 132 to slide along a length direction (a horizontal direction as viewed in fig. 9) of the fixed tool head 131 under the swinging action of the connecting rod 1333.

Specifically, as shown in fig. 7, the driving motor 1331, i.e., the electric motor, may be fixed to a motor base 1336 by bolts, and the motor base 1336 may be welded below the vehicle body 11, so as to fix the driving motor 1331; the coaxial transmission wheel 1332 is connected with the driving motor 1331 through a transmission chain 1335, so that the coaxial transmission wheel 1332 and the driving motor 1331 synchronously rotate; the connecting block 1334 may be fixed to the sliding cutter head 132 by welding and is hinged to the coaxial driving wheel 1332 by a connecting rod 1334, so that the connecting block 1334 moves back and forth to move the sliding cutter head 132 back and forth to cut the soil. In this embodiment, the connecting block 1334, the connecting rod 1333 and the coaxial transmission wheel 1332 are combined to form a slider-crank mechanism to drive the sliding tool bit 132 to perform a reciprocating linear motion along the length direction, i.e., the transverse direction, of the fixed tool bit 131. Wherein the transmission chain 1335 may be obliquely arranged.

Referring to fig. 10, it is a schematic structural diagram between a sliding rail and a traction assembly provided in an embodiment of the present invention. As shown, the traction assembly may be a front traction assembly 3 and/or a rear traction assembly 4, which may include: a slide base 61 and a hoist 62; wherein, the sliding base 61 can be connected on the sliding rail 2 in a sliding way; the winch 62 is disposed on the sliding base 61, and as shown in fig. 4, a traction cable 621 of the winch 62 is connected to the front end or the rear end of the shovel 2, that is, the traction cable 621 of the front traction assembly 3 may be connected to the forward traction hook 111 or the bucket overturning hook 121, and the traction cable 621 of the rear traction assembly 4 may be connected to the backward traction hook 112.

Specifically, as shown in fig. 10, the guide rail 2 is provided with a protrusion 21 along the length direction thereof, and the sliding base 61 is provided with a groove 611 adapted to the protrusion 21; of course, the guide rail 2 may have a groove along its length direction, and the sliding base 61 may have a protrusion adapted to the groove. The sliding base 61 and the hoisting machine 62 may be fixedly connected by bolts or other connection methods, which is not limited in this embodiment.

This foundation ditch bottom is reserved soil layer excavation device's theory of operation: when the cutter head assembly 13 works, the driving motor 1331 provides power, the driving chain 1335 drives the coaxial driving wheel 1332 to rotate, the coaxial driving wheel 1332 drives the connecting block 1334 at the end part of the connecting rod 1333 to move back and forth when rotating, the connecting block 1334 is welded on the sliding cutter head 132 and is hinged with the coaxial driving wheel 1332 by the connecting rod 1333, and the connecting block 1334 moves back and forth so that the sliding cutter head 1332 moves back and forth to cut soil; when the scraper truck 1 works, the scraper truck 1 is pulled by a traction steel wire rope 621 of a front traction assembly 3, a cutter head assembly 13 cuts soil, the cut loose soil enters a truck hopper 12 under the extrusion action of the soil, and when the scraper truck 1 is pulled to the end D shown in the figure 3 by the traction steel wire rope 621 of the front traction assembly 3, the hanging position of a hook on the traction steel wire rope 621 is changed and the hook is hung on a truck hopper overturning hook 121 on the truck hopper 12; the hopper 12 turns over and unloads soil forwards under the traction action of a traction steel wire rope 621, and then is dug and transported by a large-scale excavation machine; the scraper car 1 moves longitudinally at the end C, D under the traction of the winch at the end C, D, and the winch 62 can move transversely along the slide rail 2, so that soil in the width range of the pipe gallery is in the working range of the scraper car 1.

In summary, according to the foundation pit bottom reserved soil layer excavation device and the foundation pit excavation method provided by this embodiment, the front traction force is applied to the scraper truck 1 through the front traction assembly 3 to provide forward power for the scraper truck 1, so that the scraper truck 1 moves longitudinally, the reserved soil layer T2 is shoveled while moving, and the scraper truck 1 moves backwards under the traction action of the rear traction assembly 4, that is, the scraper truck 1 moves longitudinally under the traction of the front traction assembly 3 and the rear traction assembly 4; the front traction component 3 and the rear traction component 4 can also transversely move on the slide rail 2 along the slide rail 2 to drive the scraper car 1 to transversely move, so that soil bodies within the width range of the pipe gallery are all within the working range of the scraper car 1; reserve the soil layer excavation device through this foundation ditch bottom and excavate reserving the soil layer, the excavation face levels and does not need the large tracts of land to be maintained, can improve the efficiency of digging of reserving the soil layer, and the control excavation degree of depth prevents to surpass digs, prevents to disturb the original state soil below the foundation ditch design elevation, provides an efficient not disturbed pipe gallery foundation ditch bottom of foundation ditch bottom original state soil and reserves soil layer excavation device and foundation ditch excavation method bottom.

It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (8)

1. The utility model provides a soil layer excavation device is reserved to foundation ditch bottom which characterized in that includes:

the shovel is used for excavating the reserved soil layer;

the two sliding rails are respectively arranged on two sides of the scraper truck and play a role in longitudinal guiding;

the front traction assembly is connected to one of the slide rails in a sliding mode, is connected with the front end of the shovel truck and is used for applying front traction force to the shovel truck so as to provide forward power for the shovel truck;

the rear traction assembly is connected with the rear end of the shovel car in a sliding mode and used for applying rear traction force to the shovel car so as to provide backward power for the shovel car to move to the rear end and move from the rear end to the front end again in the longitudinal direction, and therefore reserved soil layers are excavated;

the scraper truck includes:

a vehicle body as a traveling mechanism;

the car hopper is rotatably arranged on the car body and used for storing excavated soil;

the turning tool assembly is arranged at the front end of the vehicle body and used for cutting soil bodies of reserved soil layers and extruding and guiding the cut loose soil bodies so as to enable the cut soil bodies to enter the vehicle hopper;

the lathe tool subassembly includes:

fixing a cutter head;

the sliding cutter head is connected to the fixed cutter head in a sliding manner along the length direction of the fixed cutter head and is used for sliding back and forth to cut soil;

and the power output end of the driving component is connected with the sliding tool bit and is used for driving the sliding tool bit to slide.

2. The excavation apparatus for the soil reserved in the bottom of the foundation pit according to claim 1,

the sliding cutter head is provided with a sliding groove along the length direction, the fixed cutter head is provided with a connecting piece, and the connecting piece is slidably arranged in the sliding groove in a penetrating manner.

3. The excavation apparatus for the soil layer reserved at the bottom of the foundation pit according to claim 1, wherein the driving assembly comprises:

a drive motor;

the coaxial transmission wheel is in transmission connection with an output shaft of the driving motor through a transmission chain;

the first end of the connecting rod is hinged to the coaxial driving wheel and used for swinging under the action of rotation of the coaxial driving wheel;

the connecting rod is hinged to the second end of the connecting rod, and under the action of the swinging of the connecting rod, the connecting rod drives the sliding cutter head to slide along the length direction of the fixed cutter head.

4. The excavation device for the reserved soil layer at the bottom of the foundation pit according to claim 1,

the front end of the vehicle body is provided with a forward traction hook for hooking a traction steel wire rope of the forward traction assembly so that the vehicle body can move forward under the action of the traction steel wire rope of the forward traction assembly; and/or the presence of a gas in the gas,

a retreating traction hook is arranged at the rear end of the vehicle body and is used for hooking a traction steel wire rope of the rear traction assembly so that the vehicle body retreats under the action of the traction steel wire rope of the rear traction assembly; and/or the presence of a gas in the gas,

and the hopper is provided with a hopper turning hook for hooking a traction steel wire rope of the front traction assembly so that the hopper turns forwards under the action of the traction steel wire rope.

5. The excavation device for the reserved soil layer at the bottom of the foundation pit according to claim 1,

the rear end of the vehicle body is provided with a handrail for manually adjusting the advancing direction of the vehicle body and manually adjusting the levelness of the vehicle body to control the soil cutting depth in a matching manner.

6. Excavation means for a foundation pit bottom reserved soil layer according to any of claims 1 to 5, characterized in that the front traction assembly and/or the rear traction assembly comprises:

the sliding base is connected to the sliding rail in a sliding mode;

and the winch is arranged on the sliding base, and a traction steel wire rope of the winch is connected to the front end or the rear end of the shovel car.

7. The excavation apparatus for the soil reserved in the bottom of the foundation pit according to claim 6,

the sliding rail is provided with a bulge along the length direction of the sliding rail, and the sliding base is provided with a groove matched with the bulge; and/or the presence of a gas in the gas,

the sliding rail is provided with a groove along the length direction, and the sliding base is provided with a bulge matched with the groove.

8. A foundation pit excavation method is characterized by comprising the following steps:

excavating an upper soil layer of the foundation pit by adopting an earth excavation machine, and excavating to a boundary between the upper soil layer and the reserved soil layer to expose the reserved soil layer at the bottom of the foundation pit; the distance between the boundary between the upper soil layer and the reserved soil layer and the foundation pit bottom elevation of the foundation pit is 150 mm-300 mm;

excavating the reserved soil layer to the bottom elevation of the foundation pit by using the foundation pit bottom reserved soil layer excavating device as claimed in any one of claims 1 to 7.

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