CN219061506U - Arrangement structure of comprehensive pile forming construction equipment for low-clearance filling pile under foundation pit bottom supporting beam - Google Patents
Arrangement structure of comprehensive pile forming construction equipment for low-clearance filling pile under foundation pit bottom supporting beam Download PDFInfo
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- CN219061506U CN219061506U CN202223423155.5U CN202223423155U CN219061506U CN 219061506 U CN219061506 U CN 219061506U CN 202223423155 U CN202223423155 U CN 202223423155U CN 219061506 U CN219061506 U CN 219061506U
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Abstract
The utility model relates to the technical field of filling piles and discloses an arrangement structure of a comprehensive pile forming construction device for a low-clearance filling pile under a foundation pit bottom supporting beam, which comprises a crawler-type full-rotation drilling machine, wherein a sleeve is arranged on the crawler-type full-rotation drilling machine and is inserted into a pile position hole; a reaction fork plate is arranged between the crawler crane and the crawler full-rotation drilling machine, and two sides of the reaction fork plate are respectively abutted on the crawler crane and the crawler full-rotation drilling machine; the crawler-type full-circle drilling machine is used for drilling the sleeve into the pile position hole, the crawler-type crane is used for taking out the soil layer in the sleeve, the counter-force fork plate is arranged between the crawler-type full-circle drilling machine and the crawler-type crane, the stability of the crawler-type full-circle drilling machine during rotation can be increased through the counter-force fork plate, and when the crawler-type full-circle drilling machine rotates clockwise or anticlockwise, the counter-force fork plate can provide supporting force for the crawler-type full-circle drilling machine through the stabilizing force of the ground or the crawler-type crane, so that the problem of low clearance construction inconvenience under a foundation pit bottom supporting beam is solved.
Description
Technical Field
The utility model relates to the technical field of filling piles, in particular to an arrangement structure of a low-clearance filling pile comprehensive pile forming construction device under a foundation pit bottom supporting beam.
Background
Cast-in-place piles are piles made by casting concrete or reinforced concrete into holes in place.
At present, foundation pit excavation is completed, a pile support is adopted for supporting, a plurality of reinforced concrete supports are arranged, a supporting system is formed completely, and engineering piles are bored piles;
however, after pile foundation detection, the number of the cast-in-place piles is increased due to design change of defective pile treatment; the added engineering piles are required to be constructed at the bottom of the foundation pit, a plurality of engineering piles are positioned below the bottoms of the plurality of reinforced concrete supporting beams for construction, the space height of the lower construction is lower, the equipment cannot be directly driven into the lower construction space, and the plane is limited by the supporting columns.
Under such a low clearance pile supporting structure and complex stratum condition, large-diameter and ultra-deep filling piles are constructed, the hole forming of the poor stratum such as silt and sand layers is difficult by the manual hole digging process, the digging depth is strictly forbidden to exceed 30m, meanwhile, the digging process involves precipitation, the safety risk of foundation pits in the construction process is high, and the process is difficult to use. If the punching and drilling machine frame is properly improved, the construction requirement under the low clearance environment condition can be met, but the impact hole forming efficiency is low, the circulating slurry amount is large, the hole forming at the pit bottom bears the high water head pressure of the pit wall and is easy to collapse, and the pile forming quality is difficult to guarantee. In addition, with the low-clearance rotary drilling rig which appears in recent years, besides the height limitation, the torque of the drilling rig is difficult to meet the requirement of deep hole rock entering, and the hole forming depth is generally not more than 35m, so that the pile repairing requirement of the project cannot be met.
Disclosure of Invention
The utility model aims to provide an arrangement structure of a comprehensive pile-forming construction device for a low-clearance filling pile under a foundation pit bottom supporting beam, and aims to solve the problem of inconvenient construction under the foundation pit bottom supporting beam in the prior art.
The utility model is realized in such a way that a pile-forming construction equipment arrangement structure is integrated by a low-clearance filling pile under a foundation pit bottom supporting beam, a reinforced concrete layer is poured on a construction site with the foundation pit bottom at the low clearance under the supporting beam, pile position holes are reserved on the reinforced concrete layer, the reinforced concrete layer comprises a crawler-type full-circle drilling machine, the crawler-type full-circle drilling machine is positioned on the pile position holes, a sleeve is arranged on the crawler-type full-circle drilling machine, and the sleeve is inserted into the pile position holes;
the crawler crane is characterized in that a spacing area is arranged between the supporting beam and the supporting beam, a construction station is arranged at the bottom of the spacing area, a crawler crane is arranged on the construction station, a counter-force fork plate is arranged between the crawler crane and the crawler type full-rotation drilling machine, and two sides of the counter-force fork plate are respectively abutted to the crawler crane and the crawler type full-rotation drilling machine.
Further, the crawler-type full-circle drilling machine is provided with a first crawler wheel for driving the crawler-type full-circle drilling machine to move; the first crawler wheel is positioned at the bottom of the crawler type full-rotation drilling machine;
and driving the crawler-type full-rotation drilling machine to move on the reinforced concrete layer through the first crawler wheel until the crawler-type full-rotation drilling machine is positioned on the pile position hole.
Further, the center of the chassis hole of the crawler-type full-rotation drilling machine is concentrically arranged with the center of the pile position hole.
Furthermore, the bottom of the sleeve penetrates through the pile position hole through the chassis hole, and the top of the sleeve is connected with the crawler-type full-rotation drilling machine.
Further, the crawler crane is provided with a second crawler wheel for driving the crawler crane to move, and the second crawler wheel is positioned at the bottom of the crawler crane; and driving the crawler crane to move to the application station through the second crawler wheel.
Further, the crawler-type full-rotation drilling machine is provided with a chassis, the chassis is connected with one side of a counter-force fork plate, and the other side of the counter-force fork plate is abutted to the crawler-type crane;
when the crawler-type full-rotation drilling machine rotates the sleeve clockwise or anticlockwise, the counter-force fork plate provides counter force for the crawler-type full-rotation drilling machine through counter pressure of the crawler crane.
Further, the crawler crane comprises a grab bucket for grabbing residues in the sleeve and an impact hammer for punching rock stratum in the pile position hole.
Further, when the impact grab is positioned in the sleeve, the impact hammer deviates from the sleeve; the impact grab is offset from the sleeve when the impact hammer is within the sleeve.
Further, the sleeve is located in the pile hole, the periphery of the sleeve is abutted to the inner side wall of the pile hole, and the sleeve extends from top to bottom to the bottom of the pile hole along the top of the pile hole.
Further, a transition channel for a reinforcement cage to penetrate is formed in the sleeve, the transition channel is arranged along the length direction of the sleeve, and the reinforcement cage extends from top to bottom to the bottom of the transition channel along the top of the transition channel;
the transition channel is connected with a conduit filled with concrete, the conduit extends into the bottom of the transition channel from top to bottom along the top of the transition channel, and the conduit is positioned above the bottom of the pile position hole.
Compared with the prior art ， According to the arrangement structure of the integrated pile forming construction equipment for the low-clearance cast-in-place pile under the foundation pit bottom support beam, the sleeve is drilled into the pile position hole through the crawler type full-circle drilling machine, the soil layer in the sleeve is taken out by utilizing the crawler crane, the counter-force fork plate is arranged between the crawler type full-circle drilling machine and the crawler type crane, the stability of the crawler type full-circle drilling machine during rotation can be improved through the counter-force fork plate, and when the crawler type full-circle drilling machine rotates clockwise or anticlockwise, the counter-force fork plate can provide supporting force for the crawler type full-circle drilling machine through the ground or the stabilizing force of the crawler type crane, so that the problem of inconvenient low-clearance construction under the foundation pit bottom support beam is solved.
Drawings
FIG. 1 is a schematic plan view of an arrangement structure of a comprehensive pile-forming construction device for a low-clearance cast-in-place pile under a foundation pit bottom support beam;
fig. 2 is a schematic plan view of the crawler-type full-circle drilling machine and the crawler crane provided by the utility model.
In the figure: the crawler-type full-circle drilling machine 200, the pile position hole 300, the sleeve 400, the crawler-type crane 500, the counter-force fork plate 600, the guide pipe 700, the first crawler wheel 201, the chassis 202 and the second crawler wheel 501 are arranged on the reinforced concrete layer 100.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
The implementation of the present utility model will be described in detail below with reference to specific embodiments.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present utility model, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc., based on the azimuth or positional relationship shown in the drawings, it is only for convenience of describing the present utility model and simplifying the description, but it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus terms describing the positional relationship in the drawings are merely illustrative and should not be construed as limiting the present utility model, and specific meanings of the terms described above may be understood by those of ordinary skill in the art according to specific circumstances.
Referring to fig. 1-2, a preferred embodiment of the present utility model is provided.
The method comprises the steps that (1) a reinforced concrete layer 100 is poured on a construction site with the foundation pit bottom at the low clearance below a supporting beam of the foundation pit, pile position holes 300 are reserved on the reinforced concrete layer 100, the reinforced concrete layer comprises a crawler-type full-circle drilling machine 200, the crawler-type full-circle drilling machine 200 is positioned on the pile position holes 300, a sleeve 400 is arranged on the crawler-type full-circle drilling machine 200, and the sleeve 400 is inserted into the pile position holes 300;
the support beam and the support beam are provided with a spacing area, a construction station is arranged at the bottom of the spacing area, a crawler crane 500 is arranged on the construction station, a counter-force fork plate 600 is arranged between the crawler crane 500 and the crawler type full-rotation drilling machine 200, and two sides of the counter-force fork plate 600 are respectively abutted to the crawler crane 500 and the crawler type full-rotation drilling machine 200.
The above-mentioned low headroom bored concrete pile of foundation ditch bottom support beam synthesizes into stake construction equipment arrangement structure, in boring the stake position hole 300 with sleeve pipe 400 through crawler-type full-circle drilling machine 200, utilize crawler-type crane 500 to take out the soil layer in the sleeve pipe 400, and install reaction fork plate 600 between crawler-type full-circle drilling machine 200 and the crawler-type crane 500, can increase the stability of crawler-type full-circle drilling machine 200 when rotating through reaction fork plate 600, when crawler-type full-circle drilling machine 200 clockwise or anticlockwise rotates, reaction fork plate 600 can provide the thrust for crawler-type full-circle drilling machine 200 through the steady force of ground or crawler-type crane 500, the inconvenient problem of low headroom construction under the foundation ditch bottom support beam has been solved.
Disassembling, lifting and assembling low-clearance equipment
1. When this construction method is under construction, the large-scale equipment of foundation ditch bottom of going into includes: the crawler-type full-circle drilling machine 200, a hydraulic power station, a crawler-type crane 500, a sleeve 400, an air compressor, a punching grab bucket, an impact hammer and the like;
2. in order to ensure the safety of the trestle of the foundation pit supporting structure, the single hoisting weight of the foundation pit top is required to be not more than 25t, and therefore, the crawler-type full-rotation drilling machine 200, the crawler-type crane 500 and the like with the hoisting weight are split and assembled at the foundation pit bottom; the disassembly and assembly of the large-scale equipment are guided by equipment manufacturers on site, and the large-scale equipment is tested after being assembled, normally operated and checked for use.
In this embodiment, the crawler-type full-circle drilling machine 200 has a first crawler wheel 201 that drives the crawler-type full-circle drilling machine 200 to move; the first crawler wheel 201 is positioned at the bottom of the crawler-type full-circle drilling machine 200;
the crawler-type full-circle drilling machine 200 is driven to move on the reinforced concrete layer 100 through the first crawler wheel 201 until the crawler-type full-circle drilling machine 200 is positioned on the pile position hole 300.
The crawler-type full-circle drilling machine 200 can move on the reinforced concrete layer 100 by utilizing the first crawler wheels 201, so that the crawler-type full-circle drilling machine 200 can move to each reserved pile position hole 300, and the construction efficiency and the construction flexibility of the crawler-type full-circle drilling machine 200 under a supporting beam with low clearance are improved.
The center of the hole of the chassis 202 of the crawler-type full-circle drilling machine 200 is arranged concentrically with the center of the pile position hole 300. In this way, the accuracy of crawler-type full-circle drilling machine 200 in drilling pile hole 300 through casing 400 can be improved.
The bottom of the sleeve 400 penetrates through the pile position hole 300 through the hole of the chassis 202, and the top of the sleeve 400 is connected with the crawler-type full-circle drilling machine 200. Thus, crawler-type full-circle drilling machine 200 can continuously control sleeve 400 to enter or leave pile position hole 300, so that sleeve 400 can be conveniently controlled.
In this embodiment, the crawler crane 500 has a second crawler wheel 501 for driving the crawler crane 500 to move, and the second crawler wheel 501 is located at the bottom of the crawler crane 500; the crawler crane 500 is driven to move to the application station by the second crawler wheel 501.
The crawler crane 500 can move on the reinforced concrete layer 100 by using the second crawler wheel 501, so that the crawler crane 500 can move along with the crawler type full-circle drilling machine 200 to adjust the position of the crawler type full-circle drilling machine, and can also better move to a construction station to work the reserved pile position hole 300, thereby improving the construction efficiency of the crawler crane 500 under the supporting beam with low clearance and the construction flexibility.
In this embodiment, the crawler-type full-swing drilling machine 200 is provided with a chassis 202, the chassis 202 is connected with one side of a reaction fork plate 600, and the other side of the reaction fork plate 600 is abutted against the crawler-type crane 500;
when the crawler-type full-circle drilling machine 200 rotates the sleeve 400 clockwise or counterclockwise, the reaction force fork plate 600 provides a reaction force to the crawler-type full-circle drilling machine 200 by the back pressure of the crawler crane 500.
The bottom of the counter-force fork plate 600 is abutted against the ground, the crawler-type full-circle drilling machine 200 is connected with the counter-force fork plate 600 through the chassis 202, and the chassis 202 of the crawler-type full-circle drilling machine 200 during construction is stabilized by utilizing the supporting force or counter force of the counter-force fork plate 600, so that accidents caused by the crawler-type full-circle drilling machine 200 during construction are avoided; when the crawler-type full-circle drilling machine 200 rotates the sleeve 400 clockwise or counterclockwise, the reaction force fork plate 600 provides a stabilizing force to the crawler-type full-circle drilling machine 200 by the supporting force of the bottom surface or a reaction force to the crawler-type full-circle drilling machine 200 by the back pressure of the crawler crane 500.
In this embodiment, crawler crane 500 includes a grab to grab the residue within casing 400 and an impact hammer to break the formation in pile hole 300.
The crawler crane 500 can grasp and clean residues in the pipe by using the impact grab, and the crawler crane 500 can impact rock strata in the pile hole 300 through the impact hammer, so that the casing 400 can continue to drill into the pile hole 300.
Final hole and first hole cleaning
1. When drilling to a set depth, measuring and checking the final hole;
2. after the hole is finished, the underwater grab bucket is adopted to clean the hole for the first time, and after the hole cleaning is finished, the sediment at the bottom of the hole is measured, so that the sediment at the bottom of the hole is ensured to meet the design requirement.
Manufacturing and placing of reinforcement cage
1. The reinforcement cage is processed and manufactured in advance in a processing field arranged on the top of the foundation pit, and concealed acceptance is carried out before the reinforcement cage is placed;
2. the reinforcement cage is placed in time after the first hole cleaning is completed, and the reinforcement cage is placed by adopting a process of sectionally hoisting and welding an orifice on the top of the foundation pit by adopting a crawler crane 500 or a fixed crane because the reinforcement cage is long in whole;
3. when the reinforcement cage is placed, the collision supporting beams and the upright posts are not needed to be taken care of, so that the reinforcement cage is prevented from deforming or accidents are avoided.
Second hole cleaning
1. In order to ensure pile forming quality, the thickness of sediment at the bottom of the hole is strictly controlled, and the second hole cleaning is needed after the reinforcement cage is placed;
2. because the casing 400 is in line with the pipe protection wall, the risk of hole collapse does not exist, and therefore, special slurry preparation is not needed for circulating hole cleaning, and only enough water in the casing 400 can be kept to meet the requirement of hole cleaning and recycling.
In this embodiment, the impact hammer is offset from the sleeve 400 when the impact grab is located within the sleeve 400; when the impact hammer is within the sleeve 400, the impact grab is offset from the sleeve 400.
When the crawler crane 500 utilizes the impact grab to grab and clean residues in the pipe, the impact hammer is separated from the crawler crane 500, and when the impact hammer is needed to be used, the impact grab on the crawler crane 500 is replaced by the impact hammer to work.
The sleeve 400 is positioned in the pile hole 300, the outer circumference of the sleeve 400 is abutted on the inner sidewall of the pile hole 300, and the sleeve 400 is arranged along the top of the pile hole 300 to the bottom of the pile hole 300 from top to bottom. In this way, it is possible to accurately determine whether the pile is in accordance with the design requirements through the sleeve 400.
In this embodiment, the sleeve 400 has a transition channel for a reinforcement cage to pass through, the transition channel is arranged along the length direction of the sleeve 400, and the reinforcement cage extends from top to bottom along the top of the transition channel to the bottom of the transition channel;
a conduit 700 for pouring concrete is connected in the transition channel, the conduit 700 extends from top to bottom along the top of the transition channel into the bottom of the transition channel, and the conduit 700 is located above the bottom of the pile placement hole 300.
After the sleeve 400 is fed into the pile hole 300 through the transition channel for the reinforcement cage, the sleeve 400 is slowly taken out by the crawler-type full-rotation drill in the process of pouring concrete into the pile hole 300 by using the guide pipe 700, and the pouring speed of the sleeve 400 and the concrete is always kept within a set range by the crawler-type full-rotation drill.
1. After the reinforcement cage is placed in place, the infusion catheter 700 is placed in time.
2. The material of the conduit 700 is seamless steel pipes with the wall thickness of 10mm and the diameter of 300mm, and the joints are in flange connection;
3. the catheter 700 should have good water tightness, be assembled and tested before use, and the test pressure is not less than 0.6MPa;
4. after the placement of the guide pipe 700 is completed, the distance between the bottom of the guide pipe 700 and the bottom of the pile hole 300 is controlled to be 30-50 cm.
Foundation pit top pump truck cast-in-place pile body concrete
1. After the second hole cleaning is completed, pile body concrete is poured as soon as possible;
2. pouring pile body concrete, namely pouring the pile body concrete on the top of the foundation pit by adopting a pump truck;
3. due to the relatively large concrete quantity of each pile, the average concrete quantity exceeds 100m 3 The construction efficiency in a low-clearance environment is lower, and the casting time of each pile is about 18 hours on average, so that retarder is added into concrete, and the initial setting time of the concrete is ensured to be not less than 20 hours;
4. the primary irrigation is 3m 3 Filling a large hopper, wetting the hopper with clear water before filling, adopting a bladder as a water-proof plug, placing the water-proof plug into the guide pipe 700 before initial filling, pressing a plug plate at the bottom opening in the filling hopper, and pouring concrete into the hopper through a pump truck at the top of a foundation pit; lifting the hopper when the concrete in the poured hopper meets the initial pouring quantityAt the moment, concrete presses the bladder to punch into the hole bottom;
5. in normal pouring, in order to facilitate tube drawing operation, the tube is replaced by a small hopper, and concrete pouring is continuously carried out through a pump truck material tube; the position of the concrete surface is measured periodically in the pouring process, tube drawing and tube dismantling are carried out in time, and the burial depth of the conduit 700 is controlled to be 2-4 m;
6. and finally, when the filling is finished, ensuring that the pile top over-filling height meets the design requirement.
1. Extracting the sleeve 400 in sections in the concrete pouring process;
2. in order to ensure smooth piling in consideration of the influence of bad stratum such as sand layer, the height of concrete in the sleeve 400 exceeding the bottom of the sleeve 400 is generally controlled to be not less than 20m in the process;
3. the sleeve 400 is pulled out while pouring, and all the sleeves 400 are pulled out until pouring is completed.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (10)
1. The method is characterized by comprising a crawler-type full-circle drilling machine, wherein the crawler-type full-circle drilling machine is positioned on the pile position hole, a sleeve is arranged on the crawler-type full-circle drilling machine, and the sleeve is inserted into the pile position hole;
the crawler crane is characterized in that a spacing area is arranged between the supporting beam and the supporting beam, a construction station is arranged at the bottom of the spacing area, a crawler crane is arranged on the construction station, a counter-force fork plate is arranged between the crawler crane and the crawler type full-rotation drilling machine, and two sides of the counter-force fork plate are respectively abutted to the crawler crane and the crawler type full-rotation drilling machine.
2. The arrangement structure of the integrated pile forming construction equipment for the low clearance cast-in-place piles under the foundation pit bottom supporting beams, as set forth in claim 1, wherein the crawler-type full-circle drilling machine is provided with a first crawler wheel for driving the crawler-type full-circle drilling machine to move; the first crawler wheel is positioned at the bottom of the crawler type full-rotation drilling machine;
and driving the crawler-type full-rotation drilling machine to move on the reinforced concrete layer through the first crawler wheel until the crawler-type full-rotation drilling machine is positioned on the pile position hole.
3. The arrangement structure of the integrated pile forming construction equipment for the low clearance cast-in-place piles under the foundation pit bottom support beam according to claim 2, wherein the center of the chassis hole of the crawler-type full rotary drilling machine is arranged concentrically with the center of the pile position hole.
4. A foundation pit bottom support beam lower low clearance bored concrete pile comprehensive piling construction equipment arrangement structure as set forth in claim 3, wherein the bottom of the sleeve is penetrated in the pile position hole through the chassis hole, and the top of the sleeve is connected with the crawler-type full rotary drilling machine.
5. The arrangement structure of the integrated pile forming construction equipment for the low clearance cast-in-place piles under the foundation pit bottom support beam according to claim 4, wherein the crawler crane is provided with a second crawler wheel for driving the crawler crane to move, and the second crawler wheel is positioned at the bottom of the crawler crane; and driving the crawler crane to move to the application station through the second crawler wheel.
6. The arrangement structure of the integrated pile forming construction equipment for the low-clearance bored concrete pile under the foundation pit bottom supporting beam according to any one of claims 1 to 5, wherein the crawler-type full-circle drilling machine is provided with a chassis, the chassis is connected with one side of a counterforce fork plate, and the other side of the counterforce fork plate is abutted on a crawler crane;
when the crawler-type full-rotation drilling machine rotates the sleeve clockwise or anticlockwise, the counter-force fork plate provides counter force for the crawler-type full-rotation drilling machine through counter pressure of the crawler crane.
7. An arrangement of a low clearance bored concrete pile under a foundation pit bottom support beam integrated piling construction machine according to any one of claims 1 to 5, wherein the crawler crane includes a grab bucket for grabbing residue in the casing and a hammer for breaking rock formations in the pile holes.
8. The arrangement structure of the integrated piling construction equipment for the low clearance cast-in-place piles under the foundation pit bottom support beam according to claim 7, wherein the impact hammer is deviated from the sleeve when the impact grab is positioned in the sleeve; the impact grab is offset from the sleeve when the impact hammer is within the sleeve.
9. The arrangement structure of the integrated piling construction equipment for the low clearance bored concrete pile under the foundation pit bottom support beam according to claim 8, wherein the sleeve is positioned in the pile hole, the periphery of the sleeve is abutted against the inner side wall of the pile hole, and the sleeve extends from top to bottom along the top of the pile hole to the bottom of the pile hole.
10. The arrangement structure of the integrated piling construction equipment for the low-clearance bored concrete pile under the foundation pit bottom support beam according to claim 9, wherein the sleeve is provided with a transition channel for a reinforcement cage to penetrate through, the transition channel is arranged along the length direction of the sleeve, and the reinforcement cage extends from top to bottom along the top of the transition channel to the bottom of the transition channel;
the transition channel is connected with a conduit filled with concrete, the conduit extends into the bottom of the transition channel from top to bottom along the top of the transition channel, and the conduit is positioned above the bottom of the pile position hole.
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| CN202223423155.5U CN219061506U (en) | 2022-12-16 | 2022-12-16 | Arrangement structure of comprehensive pile forming construction equipment for low-clearance filling pile under foundation pit bottom supporting beam |
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| CN202223423155.5U CN219061506U (en) | 2022-12-16 | 2022-12-16 | Arrangement structure of comprehensive pile forming construction equipment for low-clearance filling pile under foundation pit bottom supporting beam |
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