阅读说明：本技术 一种大直径地下钢砼组合结构的清障施工方法 (Obstacle clearing construction method for large-diameter underground steel-concrete composite structure ) 是由 陈柄宇 葛儒 干军 李港阳 张赟程 于 2021-09-02 设计创作，主要内容包括：本发明公开了一种大直径地下钢砼组合结构的清障施工方法,该方法适用于钢管桩基础、格构柱支承桩基础、一桩一柱桩基础等障碍物的清除处理,尤其适用于直径以上的钢管桩基础和一桩一柱桩基础的清除处理,该方法在保证基地土体扰动较小的同时,对地下障碍物进行有效清除,同时也能保证后续工程的施工,有效地解决了在老旧建筑上重新翻建的过程中需要处理地下钢砼组合的竖向分布的障碍物的难题。(The invention discloses a large-diameter underground steel concrete composite structure obstacle clearing construction method which is suitable for clearing obstacles such as a steel pipe pile foundation, a lattice column supporting pile foundation, a pile-pile foundation and the like, and is particularly suitable for clearing obstacles with diameters The method can effectively clear underground obstacles while ensuring small disturbance of the soil body of the base and can ensure the construction of subsequent engineering, thereby effectively solving the problem that the obstacles vertically distributed in the underground steel-concrete combination need to be treated in the process of rebuilding old buildings.)

1. A method for removing obstacles in a large-diameter underground reinforced concrete composite structure is characterized by comprising the following steps:

s1, preprocessing the obstacle clearing position of the old building;

s2, crushing and removing concrete filled in the steel pipe of the old pile by using a punching pile machine;

s3, drilling a steel sleeve gradually by using a full-slewing drilling machine, cutting pile body concrete at the lower part of an old pile, finishing cutting when the friction force between the steel sleeve and the pile body concrete is not less than the shearing resistance force of the pile body concrete, shearing and separating a steel pipe and the concrete, stopping drilling operation by using the full-slewing drilling machine, lifting the steel sleeve upwards, and moving the steel sleeve together with the old pile upwards to pull out the old steel pipe pile from the ground;

s4, removing the full-slewing drilling machine, and crushing and removing pile body concrete in pile holes by using a punching pile machine;

and S5, performing backfill construction on the pile hole.

2. The obstacle clearing construction method for the large-diameter underground reinforced concrete composite structure according to claim 1, wherein the step S1 of preprocessing the obstacle clearing position of the old building comprises the following specific steps:

determining the position of an underground reinforced concrete composite structure of an old building and the number of old piles contained in the underground reinforced concrete composite structure;

and carrying out flattening and foundation treatment on the field around each old pile.

3. The obstacle clearing construction method for the large-diameter underground reinforced concrete composite structure according to claim 1, wherein the concrete steps of crushing and removing the concrete filled in the old pile by using a punching pile machine in the step S2 are as follows:

arranging a punching pile machine on the pile position of an old pile to be removed, and enabling a hammer head of the punching pile machine to be positioned right above an old pile steel pipe;

enabling a hammer head of the punching pile machine to fall into an old pile steel pipe freely, crushing concrete in the old pile steel pipe, and discharging the crushed concrete from the old pile steel pipe by utilizing a mud circulation function of the punching pile machine;

and repeatedly crushing until the concrete in the steel pipe of the old pile is completely removed.

4. The obstacle clearing construction method of the large-diameter underground reinforced concrete composite structure according to claim 1, wherein the concrete steps of gradually drilling the steel sleeve into the pile body concrete of the old pile by using a full slewing drilling machine in the step S3 are as follows:

removing the punching pile machine, and arranging the full slewing drilling machine on the pile position of the old pile to be cleared, so that the center of the rotary table of the full slewing drilling machine is superposed with the center of the steel pipe of the old pile;

installing a first section of steel sleeve on a full slewing drilling machine, then starting the full slewing drilling machine, driving the first section of steel sleeve to perform 360-degree slewing by the full slewing drilling machine, cutting soil around an old pile by cutter teeth at the end part of the first section of steel sleeve so as to press the soil into pile body concrete around the old pile, connecting a second section of steel sleeve to the first section of steel sleeve when the first section of steel sleeve drills to a set depth, continuing to perform the drilling operation of the step, connecting a third section of steel sleeve to the second section of steel sleeve when the second section of steel sleeve drills to the set depth, repeating the steps until the friction force between the whole steel sleeve and the pile body concrete is not less than the shearing resistance force of the pile body concrete, finishing cutting, shearing and separating the steel pipe from the concrete, and stopping the drilling operation of the full slewing drilling machine.

5. A method for removing obstacles in a large-diameter underground reinforced concrete composite structure as claimed in claim 4, wherein when the friction between the whole steel sleeve and the pile body concrete is not less than the shearing resistance of the pile body concrete, the lower end of the first section of steel sleeve is located at least 1-2 m below the bottom of the old pile steel pipe.

6. A method for removing obstacles in a large-diameter underground reinforced concrete composite structure as claimed in claim 4, wherein before the full-slewing drilling machine is started to perform drilling operation, the verticality of each section of steel casing pipe at present is checked and corrected.

7. A obstacle clearing construction method for a large-diameter underground reinforced concrete composite structure according to claim 4, wherein the concrete steps of carrying the old pile with the steel sleeve and moving upwards to pull the old pile out of the ground in the step S3 are as follows:

in the process that the steel sleeve is lifted upwards by the full slewing drilling machine, when the nth section of steel sleeve is exposed out of the full slewing drilling machine, the nth section of steel sleeve is firstly removed, and then the part of the old pile steel pipe exposed outside the nth-1 section of steel sleeve is cut off;

then the full slewing drilling machine continuously lifts the steel sleeve upwards, when the n-1 st section of steel sleeve is exposed out of the full slewing drilling machine, the n-1 st section of steel sleeve is firstly dismantled, and then the part of the old pile steel pipe exposed outside the n-2 th section of steel sleeve is cut off;

this is repeated until the old pile is pulled out of the ground.

8. The obstacle clearing construction method for the large-diameter underground reinforced concrete composite structure according to claim 4, wherein the concrete steps of backfilling the pile holes in the step S5 are as follows:

firstly, cleaning a pile hole;

and then, filling backfill soil into the pile holes one by one, filling earthwork with the height of 3-4 m each time, tamping, and then performing next backfill operation until the backfill is carried out to the level of the ground level.

9. A obstacle clearing construction method for a large-diameter underground reinforced concrete composite structure as claimed in claim 8, wherein when the pile hole is cleared, the pile hole is backfilled after original soil is dug out.

Technical Field

The invention relates to clear treatment of vertically distributed obstacles of an underground reinforced concrete composite structure in the technical field of constructional engineering, in particular to a barrier clearing construction method of a large-diameter underground reinforced concrete composite structure.

Background

At present, a plurality of engineering projects newly built on the basis of old buildings exist, most of the projects are projects that the original old buildings do not meet the requirements of urban functions in the new era, new buildings need to be built again by pushing over, or the original developers do not have the subsequent development and building capability, and the new developers who take over greatly adjust the original designed buildings need to push over the completed parts and newly build the projects. The pile foundation of the new project and the old pile foundation have more or less contradiction conflict, and in order to ensure the integral quality and integrity of the new building, the old pile foundation needs to be cleared.

Disclosure of Invention

In view of the above, the invention provides a method for obstacle clearing construction of a large-diameter underground reinforced concrete composite structure, which is particularly suitable for diameterThe method can effectively clear underground obstacles while ensuring small disturbance of the soil body of the base and can ensure the construction of subsequent engineering, thereby effectively solving the problem that the obstacles vertically distributed in the underground steel-concrete combination need to be treated in the process of rebuilding old buildings.

A method for removing obstacles in a large-diameter underground reinforced concrete composite structure specifically comprises the following steps:

s1, preprocessing the obstacle clearing position of the old building;

s2, crushing and removing concrete filled in the steel pipe of the old pile by using a punching pile machine;

s3, drilling a steel sleeve gradually by using a full-slewing drilling machine, cutting pile body concrete at the lower part of an old pile, finishing cutting when the friction force between the steel sleeve and the pile body concrete is not less than the shearing resistance force of the pile body concrete, shearing and separating a steel pipe and the concrete, stopping drilling operation by using the full-slewing drilling machine, lifting the steel sleeve upwards, and moving the steel sleeve together with the old pile upwards to pull out the old steel pipe pile from the ground;

s4, removing the full-slewing drilling machine, and crushing and removing pile body concrete in pile holes by using a punching pile machine;

and S5, performing backfill construction on the pile hole.

Preferably, the step S1 of preprocessing the obstacle clearing position of the old building includes the following specific steps:

determining the position of an underground reinforced concrete composite structure of an old building and the number of old piles contained in the underground reinforced concrete composite structure;

and carrying out flattening and foundation treatment on the field around each old pile.

Preferably, the concrete steps of crushing and removing the concrete filled in the old pile in the step S2 are as follows:

arranging a punching pile machine on the pile position of an old pile to be removed, and enabling a hammer head of the punching pile machine to be positioned right above an old pile steel pipe;

enabling a hammer head of the punching pile machine to fall into an old pile steel pipe freely, crushing concrete in the old pile steel pipe, and discharging the crushed concrete from the old pile steel pipe by utilizing a mud circulation function of the punching pile machine;

and repeatedly crushing until the concrete in the steel pipe of the old pile is completely removed.

Preferably, the concrete steps of using the full slewing drilling machine to drill the steel sleeve into the pile body concrete of the old pile step by step in the step S3 are as follows:

removing the punching pile machine, and arranging the full slewing drilling machine on the pile position of the old pile to be cleared, so that the center of the rotary table of the full slewing drilling machine is superposed with the center of the steel pipe of the old pile;

installing a first section of steel sleeve on a full slewing drilling machine, then starting the full slewing drilling machine, driving the first section of steel sleeve to carry out 360-degree slewing by the full slewing drilling machine, cutting soil around an old pile by cutter teeth at the end part of the first section of steel sleeve to be pressed into pile body concrete around the old pile, connecting a second section of steel sleeve on the first section of steel sleeve when the first section of steel sleeve drills to a set depth, continuing to execute the drilling operation of the step, connecting a third section of steel sleeve on the second section of steel sleeve when the second section of steel sleeve drills to the set depth, repeating the operation until the friction force between the whole steel sleeve and the pile body concrete is not less than the shearing resistance force of the pile body concrete, and stopping the drilling operation by the full slewing drilling machine.

Preferably, when the friction force between the whole steel sleeve and the pile body concrete is not less than the shearing resistance force of the pile body concrete, the lower end part of the first section of steel sleeve is positioned at least 1-2 m below the bottom of the old pile steel pipe.

Preferably, before the full slewing drilling machine is started to perform drilling operation, the verticality of each section of the current steel casing pipe should be checked and corrected.

Preferably, the steel sleeve moves upwards together with the old pile in step S3, so as to extract the old pile from the ground by the following specific steps:

in the process that the steel sleeve is lifted upwards by the full slewing drilling machine, when the nth section of steel sleeve is exposed out of the full slewing drilling machine, the nth section of steel sleeve is firstly removed, and then the part of the old pile steel pipe exposed outside the nth-1 section of steel sleeve is cut off;

then the full slewing drilling machine continuously lifts the steel sleeve upwards, when the n-1 st section of steel sleeve is exposed out of the full slewing drilling machine, the n-1 st section of steel sleeve is firstly dismantled, and then the part of the old pile steel pipe exposed outside the n-2 th section of steel sleeve is cut off;

this is repeated until the old pile is pulled out of the ground.

Preferably, the concrete steps of performing backfill construction on the pile hole in the step S5 are as follows:

firstly, cleaning a pile hole;

and then, filling backfill soil into the pile holes one by one, filling earthwork with the height of 3-4 m each time, tamping, and then performing next backfill operation until the backfill is carried out to the level of the ground level.

Preferably, when the pile hole is cleaned, the original soil is excavated, and then backfilling is performed.

The invention has the beneficial effects that:

the invention is suitable for removing obstacles such as steel pipe pile foundation, lattice column supporting pile foundation, one-pile foundation and the like, and is particularly suitable for removing obstacles with diametersThe method can effectively clear underground obstacles while ensuring small disturbance of the soil body of the base and can ensure the construction of subsequent engineering, thereby effectively solving the problem that the obstacles vertically distributed in the underground steel-concrete combination need to be treated in the process of rebuilding old buildings.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic view of the construction process of the present invention.

The reference numerals in the figures have the meaning:

the method comprises the following steps of 1, 2, a road base plate, 3, a punching pile machine, 4, a hammer head, 5, 6, 7, a full-slewing drilling machine, 8, a steel sleeve, 9, pile body concrete, 10, a pile hole and 11, wherein the old pile is an old pile steel pipe, the concrete filled in the old pile, the full-slewing drilling machine is 7, the steel sleeve is 8, the pile body concrete is 9, and the backfill soil is 11.

Detailed Description

For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.

It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The present application is described in further detail below with reference to specific embodiments and with reference to the attached drawings.

The invention provides a barrier removing construction method of a large-diameter underground reinforced concrete composite structure, which specifically comprises the following steps:

and S1, preprocessing the obstacle clearing position of the old building.

Specifically, the position of the underground reinforced concrete composite structure of the old building and the number of the old piles 1 contained in the underground reinforced concrete composite structure are determined, and the construction data of the old building in the past are checked to determine the structure of the old piles 1. And carrying out flattening and foundation treatment on the field around each old pile 1. Preferably, the road base plate 2 can be placed in a field around the old pile and the steel plate can be laid, so that conditions are provided for the subsequent construction of the punching pile machine and the full-slewing drilling machine.

And S2, crushing and removing the concrete 6 filled in the old pile.

Specifically, a punching pile machine 3 is arranged on the pile position of an old pile 1 to be removed, and a hammer 4 of the punching pile machine 3 is positioned right above an old pile steel pipe 5;

the hammer head 4 of the punching pile machine falls into the old pile steel pipe 5 freely, the concrete 6 in the old pile steel pipe is crushed, and the crushed concrete is discharged from the old pile steel pipe 5 by utilizing the mud circulation function of the punching pile machine 3;

the crushing operation is repeated until the concrete 6 in the old pile steel pipe is completely removed.

In this embodiment, the diameter of the one-pile one-column steel pipe (old pile steel pipe) to be removed on site isThus, a diameter ofThe hammer head 4 is used for crushing construction.

The step has the function of reducing the dead weight of the steel pipe and the internal concrete of the old pile as much as possible, and reducing the weight of the construction of subsequent pile pulling.

And S3, gradually drilling the steel sleeve 8 into the pile body concrete 9 of the old pile 1 by using the full slewing drilling machine 7, stopping drilling operation and lifting the steel sleeve 8 upwards by using the full slewing drilling machine 7 when the friction force between the steel sleeve 8 and the pile body concrete 9 is not less than the shearing resistance force of the pile body concrete 9, and moving the steel sleeve 8 upwards together with the old pile 1 to pull out the old pile 1 from the ground.

Specifically, first, the punching pile machine 3 is removed, and the full slewing drilling machine 7 is arranged at the pile position of the old pile 1 to be removed so that the center of the turntable thereof coincides with the center of the old pile steel pipe 5.

After the full slewing drilling machine 7 is in place, the required verticality of the steel sleeve 8 is required to be checked and corrected, the verticality deviation of the steel sleeve 8 is required to be smaller than D/300(D is the pile diameter of an old pile), and the steel sleeve 8 is installed on the full slewing drilling machine 7 section by section along with the continuous increase of the drilling depth. Then, the full slewing drilling machine 7 is firstly run in a test mode, and after the test operation is normal, parameters such as the rotating speed and the rotating torque of the full slewing drilling machine 7 are adjusted.

Then, the first section of steel sleeve is installed on a full slewing drilling machine 7, the full slewing drilling machine 7 is started, the full slewing drilling machine 7 drives the first section of steel sleeve to perform 360-degree slewing so as to reduce the frictional resistance between the first section of steel sleeve and the soil body, and cutter teeth at the end part of the first section of steel sleeve cut the soil body around the old pile 1 so as to be pressed into the pile body concrete around the old pile 1. Generally, when the initial drilling depth is within 5m, the rotating speed of the full-slewing drilling machine 7 is controlled to be 3-5 revolutions per minute, and the rotating torque is stabilized to be about 30% -50% of the rated maximum torque so as to ensure the stability of initial drilling machine equipment and the drilling verticality;

when a first section of steel sleeve is drilled downwards to a set depth, a second section of steel sleeve is hoisted and connected to the first section of steel sleeve through a crawler crane (the first section of steel sleeve is connected with the second section of steel sleeve through a high-strength bolt), the drilling operation of the step is continuously executed, when the second section of steel sleeve is drilled downwards to the set depth, a third section of steel sleeve is connected to the second section of steel sleeve, the steps are repeated, n sections of steel sleeves on a full slewing drilling machine are gradually cut into the pile body concrete 9 for about 5m (the old pile steel sleeve is anchored into the pile body concrete 9 for about 3m, the lower end part of the first section of steel sleeve is positioned at a position about 1m-2m below the bottom of the old pile steel pipe), the friction force between the steel sleeve 8 and the pile body concrete 9 linearly rises, after the steel sleeve is continuously pressed into a certain depth, the friction force between the whole steel sleeve 8 and the pile body concrete 9 is not smaller than the shearing resistance force of the pile body concrete 9, and the full slewing drilling machine 7 stops drilling operation, and the steel sleeve 8 is drilled in place.

Then, the steel casing 8 is rotated and lifted up by the full slewing drilling machine 7, and the steel casing 8 moves up together with the old pile 1.

In the process that the steel sleeve 8 is lifted upwards by the full slewing drilling machine 7, when the nth section of steel sleeve is exposed out of the full slewing drilling machine, the nth section of steel sleeve is firstly removed, and then the part of the old pile steel pipe 5 exposed outside the (n-1) th section of steel sleeve is cut off and lifted to a safe area; then, the full slewing drilling machine 7 continuously lifts the steel sleeve 8 upwards, when the n-1 st section of steel sleeve is exposed out of the full slewing drilling machine 7, the n-1 st section of steel sleeve is firstly removed, and then the part of the old pile steel pipe 5 exposed outside the n-2 th section of steel sleeve is cut off and lifted to a safe area; this is repeated until the old pile 1 is pulled out of the ground.

And S4, removing the full slewing drilling machine 7, and crushing and cleaning the pile body concrete 9 in the pile hole.

Specifically, after the old pile 1 is pulled out, the full slewing drilling machine 7 is removed, the punching pile machine 3 is arranged at the rotary hole again, the pile body concrete 9 in the pile hole is crushed and broken by the force generated by the free falling action of the hammer head, and the crushed pile body concrete 9 is discharged in a circulating manner by matching with slurry until the pile body concrete 9 is completely crushed.

And S5, performing backfill construction on the pile hole 10.

Specifically, the pile hole 10 is first subjected to hole cleaning construction, and preferably, when the pile hole is subjected to hole cleaning construction, the original soil is excavated, and then backfilling construction is performed. And then, filling backfill 11 into the pile holes 10 one by one, filling earthwork with the height of 3-4 m each time, tamping, and then performing next backfill operation until the backfilling is carried out to the level of the ground level. The backfill soil 11 is backfilled by adopting earthwork (3: 7).

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.