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Pile head cutting method for underwater concrete pile construction
CN111119181A
China
Worldwide applications
2020
CN
Application CN202010055176.2A events
2020-01-17
2020-05-08
Status
Pending
Description
translated from
Technical Field
The invention relates to the technical field of concrete pile construction in a soft soil foundation reinforcement treatment method, in particular to a treatment technology of an underwater concrete pile foundation.
Background
The concrete pile composite foundation is suitable for treating soil layers such as clay, silt, sandy soil, plain filling soil, loess and the like. The applicability of the mud and mucky soil foundation is determined according to regional experience or field test, and the rigid pile in the rigid pile composite foundation is a friction pile. In the using process, a mattress layer with a certain thickness is usually laid on the pile top, and the fact that the pile and the soil bear load together through the deformation coordination of the pile and the soil is the essence and the forming condition of the composite foundation. Because the end-bearing type pile has almost no settlement deformation, the relative deformation of the pile soil can be coordinated only through the cushion layer, and the unknown factors are more, such as foundation settlement caused by the drop of underground water level, and because of various reasons, when the cushion layer on the foundation and the inter-pile soil is separated, the inter-pile soil can not bear load any more.
The concrete pile composite foundation consists of three parts, namely, a pile, pile soil and a mattress layer. The pile end generally penetrates through a soft soil layer to reach a soil layer with higher bearing capacity at the bottom, the pile is connected with the foundation through a mattress layer (such as sand, broken stone and the like), and the load is transmitted through the pile body and is jointly born by pile soil. The mattress layer distributes the base pressure transmitted from the upper foundation to the piles and the soil between the piles in a certain proportion through proper deformation so that the piles and the soil between the piles are stressed together. Meanwhile, the soil body is compacted by the piles to improve the bearing capacity, the piles improve the bearing performance due to the increase of the lateral stress of the surrounding soil, and the piles and the soil work together to form a stress whole of the composite foundation to jointly bear the load transmitted from the upper foundation.
The construction of concrete pile is commonly used in long spiral drilling pouring pile-forming, vibrating immersed tube pouring pile-forming, etc., after pile-forming, after the age and strength of concrete meet the requirements, small-sized machinery is required to remove the soil between piles. And then, cutting off the pile head above the designed pile top elevation by adopting a circular cutting process, namely manually cutting by adopting a cutting machine, wherein the cutting depth of each edge is not less than 15cm, inserting three steel rods at the same horizontal plane at the position of the pile head cutting seam at the same angle after cutting, and striking by using an iron hammer to cut off the pile head. Because the construction amount of the concrete piles for treating the foundation is generally large, and manual cutting is needed to ensure the construction quality, the construction efficiency is very low.
In recent years, with the rapid development of the water conservancy and water transportation industry, the requirement of underwater structures on foundation load is higher and higher, and the foundation treatment process and method are also widely applied to the foundation treatment of underwater soft soil layers so as to enhance the foundation bearing capacity of the underwater soft soil layers. Such as vibroflotation gravel piles, compacted sand-soil piles, concrete piles and the like, are used for treating underwater soft soil layers to meet the requirements of production and living. The construction of underwater concrete piles is often carried out by parking a concrete pile machine on a large-sized flat top barge for overwater construction, and achieving the purpose of accurate construction through accurate displacement of the flat top barge.
When the concrete pile is applied to underwater weak soil foundation treatment, different from land construction, the most critical construction link is pile head treatment, and the elevation of the treated pile top must meet the design requirement.
When the elevation of the designed pile top is below the water surface, if the manual mechanical cutting is still carried out according to the onshore construction scheme, the cutting is difficult. Firstly, underwater cutting cannot be effectively guaranteed in construction safety; secondly, the underwater operation cost of divers is high, the foundation treatment area is large, and the cost is huge when the number of piles is large; and finally, the construction efficiency is greatly reduced, and the completion according to the construction period cannot be ensured at all.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art, and provides a pile head cutting method for underwater concrete pile construction, which can make the foundation treatment of an underwater concrete pile simpler, more convenient and quicker, has shorter construction period and lower cost, causes less pollution to the environment in the construction process and does not cause resource waste.
In order to solve the technical problems, the invention adopts the following technical scheme: a pile head cutting method for underwater concrete pile construction is characterized by comprising the following steps: the method comprises the following steps of (1),
1) carrying out first dredging and dredging on the treatment range of the underwater part of the foundation of the proposed site according to the construction specification and the design requirement of a drawing, and reserving foundation soil with the height not more than 50CM higher than the foundation;
2) performing water construction of the foundation concrete pile in a construction area, wherein the top end of the concrete pile protrudes above the elevation;
3) before the concrete pile is initially set, carrying out secondary excavation dredging by using a long-arm excavator, excavating the reserved foundation soil and pile head concrete together to realize the cutting of the pile head of the concrete pile, and cutting the pile head of the concrete pile to reach the designed elevation;
4) after the secondary excavation is finished, immediately adopting measuring equipment to measure the elevation, and ensuring that the elevation after the secondary excavation meets the design requirement;
and (5) repeating the steps 2) to 4) until the construction of the whole foundation treatment range is completed, the requirements of drawing design and construction specification are met, and the work is smoothly carried out and accepted.
When the first dredging and desilting is carried out in the step 1), the thickness of the reserved foundation soil is 20-50 CM.
Two pile machines and a long arm digging machine are pulled to a flat barge, the barge is moved to a construction area by using a tugboat, four corners of the barge are fixed by using positioning anchor piles or towing ropes, and when the barge is positioned, the satellite positioning equipment on the barge is used for accurately positioning so as to ensure that the constructed pile position meets the requirements of construction specifications and drawing design and the horizontal error does not exceed the design limit value.
When the concrete piles are constructed, each concrete pile is constructed row by transversely moving two pile machines on a barge; when the pile machine is shifted, the satellite positioning design on the pile machine is utilized to carry out accurate positioning so as to meet the requirement of horizontal accuracy; the two pile machines are arranged on two sides of the barge in a split mode, and construction is carried out on two sides of the barge independently; after the pile driver drills to the designed depth, concrete is pumped and poured through a drill rod of the pile driver by a concrete pump placed on the bank.
The first dredging operation is also carried out by means of a long-arm excavator.
And during secondary excavation, excavating in a single-row pile excavating mode or a double-row pile excavating mode by adopting a long-arm excavator.
After secondary excavation of foundation soil of a reserved area of an area and pile head cutting are completed and the requirement of elevation is met, the barge is moved by using the cable rope and is accurately positioned by matching with a satellite positioning system, so that the pile machine is moved to the next construction pile position, and construction is continued.
The method provided by the invention is adopted to cut off the pile head of the underwater concrete pile, the construction difficulty is greatly reduced, the workload is greatly reduced, the cost can be saved, the construction speed can be better controlled, the construction period is shortened, the resource waste is reduced, the method is completed in one step, personnel and equipment do not need to be dispatched for the second time, the influence on the environment is less, and the subsequent process can be carried out when the concrete reaches the design strength after the removal is finished.
Drawings
FIG. 1 is a schematic plan view of the construction process of the present invention;
FIG. 2 is a schematic cross-sectional view of the construction process of the present invention;
fig. 3 is a schematic view of excavation of the concrete pile of the present invention before initial setting.
In the figure, 1 is a barge, 2 is a long-arm excavator, 3 is a pile machine, 4 is a concrete pump, 5 is a concrete pile, and 6 is a positioning anchor pile.
Detailed Description
The invention is further illustrated by the following specific embodiments in conjunction with the accompanying drawings:
referring to fig. 1, 2 and 3, the pile head cutting method for underwater concrete pile construction is performed as follows,
1) dredging and dredging the underwater part of the site to be built for the first time according to the specification and the requirement of a drawing, reserving about 50cm of the finished elevation of the dredging for the current time, for example, dredging to-20.6 m according to the requirement of the drawing, and dredging to-20.1 m;
2) and dispatching equipment to carry out the water construction of the concrete pile 5 within the foundation treatment range. During construction, the stability and safety of equipment must be ensured, and if the normal operation of the machine is influenced by strong wind weather, water flow or waves, the construction is stopped immediately;
3) firstly, combining equipment conditions and field conditions, two pile machines 3 and a long-arm excavator 2 are pulled onto a flat-bed barge 1, then the barge 1 is moved to a construction area by using a tugboat, four corners of the barge are fixed by using positioning anchor piles 6 (steel piles) or towing ropes, and when the barge is positioned, the barge is accurately positioned by using GPS positioning equipment on the barge. Ensuring that the constructed pile position meets the requirements of specifications and drawings and the horizontal error does not exceed the limit value;
4) each concrete pile 5 is constructed row by moving two pile machines 3 on the barge 1 laterally. When the pile driver 3 is shifted, the GPS on the pile driver 3 is required to be used for accurate positioning, and the requirement of horizontal accuracy is met. The two pile machines 3 are arranged on two sides of the barge in a separated mode, and construction is carried out on two sides of the barge independently. After the pile machine 3 drills to the designed depth, concrete is pumped and poured through a drill rod of the pile machine 3 by a concrete pump 4 placed on the bank;
5) the elevation of the current intersection is-20.6 m, namely the elevation of the pile head of the final dredging and cutting is-20.6 m. The elevation of the mud surface of the concrete pile 5 after the construction and the pouring is finished is-20.1 m, namely the reserved elevation after the first dredging is finished. In order to achieve the purpose of pile head cutting, after the concrete pile 5 is constructed and before the concrete is initially set, the long-arm excavator 2 is used for secondary excavation and dredging, and then reserved 50cm of foundation soil and pile head concrete are dug together to achieve the purpose of pile head cutting. The elevation of the long-arm excavator 2 after excavation is-20.6 m, namely the current foundation treatment delivery elevation;
6) after the construction of the single-row concrete piles 5 in the foundation treatment range is finished, immediately before the initial setting of the concrete of the pile body, excavating and removing reserved foundation soil of 50cm by using a long-arm excavator stopped on a barge, and excavating and removing the concrete of the pile head together to achieve the aim of cutting the pile head; it should be noted that in the actual construction process, the adjustment can be performed according to the actual conditions of mechanical equipment and engineering. Either in the direction along the side of the barge 1 or perpendicular to the side of the barge 1. The digging machine can be used for digging and removing the single-row piles immediately after the construction, and can also be used for digging and removing the double-row piles together after the construction. And the reserved soil for the first dredging is 50cm, if the geological condition is better, the thickness of the reserved soil can be reduced to 30cm or less, such as 20cm, depending on the field condition.
7) And after the construction of the single-row concrete piles 5 is finished and the secondary excavation is finished, immediately adopting measuring equipment to measure the elevation, and ensuring that the elevation after the secondary excavation meets the requirement. After the correctness is confirmed, the barge 1 is moved by using the towing rope, and the GPS is used for accurate positioning, so that the pile driver 2 is moved to the next row of construction pile positions for continuous construction;
and repeating the related steps until the construction of the whole foundation treatment range is completed, and the requirements of drawings and specifications are met, and the work is smoothly checked and accepted.
The present invention has been described in detail, and it should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Claims (7)
Hide Dependent
translated from
Claims (7)
Hide Dependent
translated from
1. A pile head cutting method for underwater concrete pile construction is characterized by comprising the following steps: the method comprises the following steps of (1),
1) carrying out first dredging and dredging on the treatment range of the underwater part of the foundation of the proposed site according to the construction specification and the design requirement of a drawing, and reserving foundation soil with the height not more than 50CM higher than the foundation;
2) performing water construction of the foundation concrete pile in a construction area, wherein the top end of the concrete pile protrudes above the elevation;
3) before the concrete pile is initially set, carrying out secondary excavation dredging by using a long-arm excavator, excavating the reserved foundation soil and pile head concrete together to realize the cutting of the pile head of the concrete pile, and cutting the pile head of the concrete pile to reach the designed elevation;
4) after the secondary excavation is finished, immediately adopting measuring equipment to measure the elevation, and ensuring that the elevation after the secondary excavation meets the design requirement;
and (5) repeating the steps 2) to 4) until the construction of the whole foundation treatment range is completed, the requirements of drawing design and construction specification are met, and the work is smoothly carried out and accepted.
2. The pile head cutting method for underwater concrete pile construction according to claim 1, characterized in that: when the first dredging and desilting is carried out in the step 1), the thickness of the reserved foundation soil is 20-50 CM.
3. The pile head cutting method for underwater concrete pile construction according to claim 1, characterized in that: two pile machines and a long arm digging machine are pulled to a flat barge, the barge is moved to a construction area by using a tugboat, four corners of the barge are fixed by using positioning anchor piles or towing ropes, and when the barge is positioned, the satellite positioning equipment on the barge is used for accurately positioning so as to ensure that the constructed pile position meets the requirements of construction specifications and drawing design and the horizontal error does not exceed the design limit value.
4. The pile head cutting method for underwater concrete pile construction according to claim 1, characterized in that: when the concrete piles are constructed, each concrete pile is constructed row by transversely moving two pile machines on a barge; when the pile machine is shifted, the satellite positioning design on the pile machine is utilized to carry out accurate positioning so as to meet the requirement of horizontal accuracy; the two pile machines are arranged on two sides of the barge in a split mode, and construction is carried out on two sides of the barge independently; after the pile driver drills to the designed depth, concrete is pumped and poured through a drill rod of the pile driver by a concrete pump placed on the bank.
5. The pile head cutting method for underwater concrete pile construction according to claim 1, characterized in that: the first dredging operation is also carried out by means of a long-arm excavator.
6. The pile head cutting method for underwater concrete pile construction according to claim 1, characterized in that: and during secondary excavation, excavating in a single-row pile excavating mode or a double-row pile excavating mode by adopting a long-arm excavator.
7. The pile head cutting method for underwater concrete pile construction according to claim 1, characterized in that: after secondary excavation of foundation soil of a reserved area of an area and pile head cutting are completed and the requirement of elevation is met, the barge is moved by using the cable rope and is accurately positioned by matching with a satellite positioning system, so that the pile machine is moved to the next construction pile position, and construction is continued.