CN115637689A - Immersed tube reinforcement gravel pile construction method for reinforcing soft foundation - Google Patents
Immersed tube reinforcement gravel pile construction method for reinforcing soft foundation Download PDFInfo
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- CN115637689A CN115637689A CN202211270932.9A CN202211270932A CN115637689A CN 115637689 A CN115637689 A CN 115637689A CN 202211270932 A CN202211270932 A CN 202211270932A CN 115637689 A CN115637689 A CN 115637689A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
Abstract
The invention provides a construction method of a immersed tube reinforcement gravel pile for reinforcing a soft foundation, which comprises the steps of firstly constructing on the ground of the foundation to form a pile hole, uniformly and circumferentially arranging a plurality of grouting pipes in the pile hole, wherein the grouting pipes are 0.2-0.3m higher than the ground so as to be convenient for grouting, then pouring gravel from a gravel inlet at the top of the pile pipe, then putting a manufactured geogrid cylinder from the top of the pile hole, then pouring gravel into a mouth of the geogrid cylinder to form the reinforcement gravel pile, and after the gravel pile is formed for 3-5 days, pouring cement slurry into holes in the gravel pile from the reserved grouting pipes by using a high-pressure grouting pump so as to form a semi-rigid grouting gravel pile. The gravel pile pipe constructed by the method has a simple structure, the construction method is quick and simple, deformation or collapse of the hole wall can not be caused, and the construction quality can be effectively ensured.
Description
The application is a divisional application of a patent application named 'a construction method of immersed tube reinforcement gravel pile for reinforcing soft foundation', and the application date of the original application is 2021, 08 and 03 days, and the application number is 202110887537.4.
Technical Field
The invention relates to the technical field of gravel pile construction, in particular to a construction method of a gravel pile hooped by immersed tubes for reinforcing a soft foundation.
Background
When the natural foundation can not meet the requirement of the building on the foundation, the foundation needs to be processed to form an artificial foundation so as to ensure the safety and normal use of the building. The vertical reinforcement composite foundation is a common foundation reinforcing treatment technical measure, and the vertical reinforcements used in the engineering at present comprise gravel piles, sand piles, cement soil piles, lime piles, various low-strength piles, reinforced concrete piles and the like. Wherein, because the gravel pile composite foundation can fully play the role of replacement, the shear strength of the foundation is increased; meanwhile, the gravel pile body has good water permeability, and can play a good role in draining water under the action of an upper load. The gravel pile body can also accelerate the consolidation of the foundation, increase the strength of the foundation and reduce the settlement of the foundation; in addition, the gravel pile body has rich material sources and low cost, and is also an important advantage of the gravel pile. Therefore, in recent years, stone-pile composite foundations have been widely used and have achieved remarkable effects in soft soil foundation reinforcement treatment. The conventional gravel pile hole forming method comprises a vibration water-flushing method and a vibration pipe sinking method, and the vibration water-flushing method is more suitable because the holes formed in the soft soil are easy to collapse and difficult to form.
According to the using effect in the current engineering, the geogrid is utilized within the range of the depth of 2m at the upper part of the gravel pile to achieve a better reinforcement effect, the bulging deformation can be fully controlled, and meanwhile, the utilization rate of the geogrid material is highest. However, in the prior art, the construction of the reinforced gravel pile by adopting any process can ensure that the formed pile hole is not deformed or collapsed to ensure the quality, and has simple and convenient processes, thereby becoming a problem to be solved urgently in engineering.
Therefore, in view of the above current situation, there is an urgent need to develop a method for constructing a gravel pile with immersed tube reinforcement for reinforcing a soft foundation, so as to overcome the disadvantages in the current practical use.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a construction method of a immersed tube reinforcement gravel pile for reinforcing a soft foundation.
In order to achieve the purpose, the invention provides the following scheme:
a construction method of a immersed tube reinforcement gravel pile for reinforcing a soft foundation comprises the following steps:
s1001, building a gravel pile construction platform, dragging and transporting the gravel pile construction platform to a foundation, and arranging a gravel storage bin, a vibroflot and a vibrating immersed tube gravel pile machine on the gravel pile construction platform;
s1002, constructing on the ground of a foundation to form a pile hole, and uniformly and circumferentially installing a plurality of grouting pipes in the pile hole, wherein the grouting pipes are 0.2-0.3m higher than the ground so as to facilitate grouting; the grouting pipes are steel pipes or PVC pipes, and 4-6 grouting pipes are arranged;
s1003, installing a pile pipe on the vibration immersed tube gravel pile machine, vibrating the immersed tube at a preset position of a foundation, and stopping vibrating after reaching a preset elevation; filling broken stones from a broken stone inlet at the top of the pile pipe, continuously supplementing broken stones in the vibrating pipe-drawing process and controlling the amount of broken stones so that the top surfaces of the broken stones are 3-6m away from the top of the pile hole;
s1004, placing the manufactured geogrid cylinder from the top of a pile hole, then filling gravels into the opening of the geogrid cylinder to form a reinforcement gravel pile, wherein the amount of the filled gravels ensures that the top mark energy of the reinforcement gravel pile reaches a preset elevation; the outer diameter of the sleeve of the geogrid cylinder is 10-20mm smaller than the inner diameter of the pile hole, and the height of the sleeve is 3m;
s1005, after the gravel pile is formed for 3-5 days, injecting cement slurry into the hole in the gravel pile from the retained grouting pipe by using a high-pressure grouting pump to form a semi-rigid grouting gravel pile; the cement paste is prepared by cement with the grade of more than 32.5, the water cement ratio is 0.3-0.5, the grouting amount is preferably that the specific gravity of the surface grout is not less than 1.2, and the grouting pressure is 0.1-0.5Mpa; the cement slurry is one of self-compacting cement mortar, self-compacting cement paste and underwater self-protecting self-compacting cement paste.
Preferably, in step S1001, the constructing of the gravel pile construction platform includes the following steps:
s2001, arranging a through self-elevating platform in the middle of a gravel pile construction platform, oppositely arranging a pair of gantry structures on the self-elevating platform, extending two ends of a main beam of each gantry structure out of the self-elevating platform, horizontally arranging a track on the main beam, and arranging a truss crane on the track to enable the truss crane to move along the length direction of the track;
and S2002, connecting the vibroflot to the truss crane, and enabling the truss crane to drive the vibroflot to move left and right and lift up and down on the gravel pile construction platform.
Preferably, in step S1003, the gravel filling method includes the following steps:
s3001, determining the pore ratio of dense and piled crushed stones and the expansion degree and viscosity of cement paste for forming cemented crushed stones;
s3002, vibrating by using a vibrator when the pile hole is backfilled with the crushed stone until the porosity ratio of the crushed stone reaches a preset value.
Compared with the prior art, the invention has the beneficial effects that:
the invention firstly forms a pile hole on the ground of a foundation, and a plurality of grouting pipes are uniformly distributed and installed in the pile hole along the circumferential direction, the grouting pipes are 0.2-0.3m higher than the ground for grouting conveniently, then gravel is poured in from a gravel inlet at the top of the pile pipe, then the manufactured geogrid cylinder is put in from the top of the pile hole, then the gravel is poured in the cylinder opening of the geogrid to form a reinforced gravel pile, and after the gravel pile is formed for 3-5 days, cement slurry is poured in from the grouting pipe of the reserved gravel pile by using a high-pressure grouting pump to fill holes in the gravel pile to form a semi-rigid grouting gravel pile.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, 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 without inventive exercise.
Fig. 1 is a flow chart of a construction method of a immersed tube reinforcement gravel pile for reinforcing a soft foundation.
Fig. 2 is a flow chart of a gravel pile construction platform built in the method for constructing the immersed tube reinforcement gravel pile for reinforcing the soft foundation.
FIG. 3 is a flow chart of a gravel filling method in the construction method of the immersed tube reinforcement gravel pile for reinforcing the soft foundation.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, the inclusion of a list of steps, processes, methods, etc. is not limited to only those steps recited, but may alternatively include additional steps not recited, or may alternatively include additional steps inherent to such processes, methods, articles, or devices.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example 1
Referring to fig. 1-3, in an embodiment of the present invention, a method for constructing a gravel pile with immersed tube reinforcement for reinforcing a soft foundation includes the following steps:
s1001, building a gravel pile construction platform, dragging and transporting the gravel pile construction platform to a foundation, and arranging a gravel storage bin, a vibroflot and a vibrating immersed tube gravel pile machine on the gravel pile construction platform;
s1002, constructing on the ground of a foundation to form a pile hole, and uniformly and circumferentially installing a plurality of grouting pipes in the pile hole, wherein the grouting pipes are 0.2-0.3m higher than the ground so as to facilitate grouting;
s1003, mounting a pile pipe on the vibration immersed tube gravel pile machine, vibrating the immersed tube at a preset position of the foundation, and stopping vibrating after reaching a preset elevation; filling broken stones from a broken stone inlet at the top of the pile pipe, continuously supplementing broken stones in the vibrating pipe-pulling process and controlling the amount of broken stones so that the top surfaces of the broken stones are 3m away from the top of the pile hole;
s1004, placing the manufactured geogrid cylinder from the top of a pile hole, then filling gravels into the opening of the geogrid cylinder to form a reinforcement gravel pile, wherein the amount of the filled gravels ensures that the top mark energy of the reinforcement gravel pile reaches a preset elevation;
and S1005, after the gravel pile is formed for 3 days, injecting cement slurry into the hole in the gravel pile from the retained grouting pipe by using a high-pressure grouting pump to form a semi-rigid grouting gravel pile.
In step S1001 in the embodiment of the present invention, constructing a gravel pile construction platform includes the following steps:
s2001, arranging a through self-elevating platform in the middle of a gravel pile construction platform, oppositely arranging a pair of gantry structures on the self-elevating platform, enabling two ends of a main beam of each gantry structure to extend out of the self-elevating platform, horizontally arranging a track on the main beam, and arranging a truss crane on the track to enable the truss crane to move along the length direction of the track;
and S2002, connecting the vibroflot to the truss crane, and enabling the truss crane to drive the vibroflot to move left and right and lift up and down on the gravel pile construction platform.
In step S1002 in the present invention, the grouting pipes are steel pipes or PVC pipes, and 4 grouting pipes are provided.
In step S1003 of the embodiment of the present invention, the method for filling crushed stone includes the following steps:
s3001, determining the pore ratio of dense and stacked crushed stones and the expansion degree and viscosity of cement paste for forming cemented crushed stones;
s3002, vibrating by using a vibrator when the pile hole is backfilled with the crushed stone until the porosity ratio of the crushed stone reaches a preset value.
In step S1004, the sleeve outer diameter of the geogrid cylinder is 10mm smaller than the pile hole inner diameter, and the height is 3m.
In step S1005 of the embodiment of the present invention, the cement slurry is prepared from cement of 32.5 grades or more, the water cement ratio is 0.3, the grouting amount is preferably not less than 1.2 of the specific gravity of the surface slurry, and the grouting pressure is 0.1Mpa.
In step S1005 of the present embodiment, the cement slurry is self-compacting cement slurry.
Example 2
Referring to fig. 1-3, in an embodiment of the present invention, a method for constructing a gravel pile with immersed tube reinforcement for reinforcing a soft foundation includes the following steps:
s1001, building a gravel pile construction platform, dragging and transporting the gravel pile construction platform to a foundation, and arranging a gravel storage bin, a vibroflot and a vibrating immersed tube gravel pile machine on the gravel pile construction platform;
s1002, constructing on the ground of a foundation to form a pile hole, and uniformly and circumferentially installing a plurality of grouting pipes in the pile hole, wherein the grouting pipes are 0.2-0.3m higher than the ground so as to facilitate grouting;
s1003, installing a pile pipe on the vibration immersed tube gravel pile machine, vibrating the immersed tube at a preset position of a foundation, and stopping vibrating after reaching a preset elevation; filling broken stones from a broken stone inlet at the top of the pile pipe, continuously supplementing broken stones in the vibrating pipe-pulling process and controlling the amount of broken stones so that the top surfaces of the broken stones are 6m away from the top of the pile hole;
s1004, placing the manufactured geogrid cylinder from the top of the pile hole, then pouring gravels into the opening of the geogrid cylinder to form a rib-hooped gravel pile, wherein the top mark energy of the rib-hooped gravel pile is ensured to reach a preset elevation by the aid of the poured gravels;
and S1005, after the gravel pile is formed for 5 days, injecting cement slurry into the hole in the gravel pile from the retained grouting pipe by using a high-pressure grouting pump to form a semi-rigid grouting gravel pile.
In step S1001 in the embodiment of the present invention, constructing a gravel pile construction platform includes the following steps:
s2001, arranging a through self-elevating platform in the middle of a gravel pile construction platform, oppositely arranging a pair of gantry structures on the self-elevating platform, enabling two ends of a main beam of each gantry structure to extend out of the self-elevating platform, horizontally arranging a track on the main beam, and arranging a truss crane on the track to enable the truss crane to move along the length direction of the track;
and S2002, connecting the vibroflotation device to the truss crane, and enabling the truss crane to drive the vibroflotation device to move left and right and lift up and down on the gravel pile construction platform.
In step S1002 in the present invention, the grouting pipes are steel pipes or PVC pipes, and the number of the grouting pipes is set to 6.
In step S1003 of the embodiment of the present invention, the method for pouring crushed stone includes the following steps:
s3001, determining the pore ratio of dense and piled crushed stones and the expansion degree and viscosity of cement paste for forming cemented crushed stones;
s3002, vibrating by using a vibrator when the pile hole is backfilled with the crushed stone until the porosity ratio of the crushed stone reaches a preset value.
In step S1004, the sleeve outer diameter of the geogrid cylinder is 20mm smaller than the pile hole inner diameter, and the height is 3m.
In step S1005 of the embodiment of the present invention, the cement slurry is prepared from cement of 32.5 grades or more, the water cement ratio is 0.5, the grouting amount is preferably not less than 1.2 of the specific gravity of the surface grout, and the grouting pressure is 0.5Mpa.
In step S1005 of the present embodiment, the cement slurry is a self-compacting cement paste.
Example 3
Referring to fig. 1-3, in an embodiment of the present invention, a method for constructing a gravel pile with immersed tube reinforcement for reinforcing a soft foundation includes the following steps:
s1001, building a gravel pile construction platform, dragging and transporting the gravel pile construction platform to a foundation, and arranging a gravel storage bin, a vibroflot and a vibrating immersed tube gravel pile machine on the gravel pile construction platform;
s1002, constructing on the ground of a foundation to form a pile hole, and uniformly and circumferentially installing a plurality of grouting pipes in the pile hole, wherein the grouting pipes are 0.2-0.3m higher than the ground so as to facilitate grouting;
s1003, installing a pile pipe on the vibration immersed tube gravel pile machine, vibrating the immersed tube at a preset position of a foundation, and stopping vibrating after reaching a preset elevation; filling broken stones from a broken stone inlet at the top of the pile pipe, continuously supplementing broken stones in the vibrating pipe-pulling process and controlling the amount of broken stones so that the top surfaces of the broken stones are 4m away from the top of the pile hole;
s1004, placing the manufactured geogrid cylinder from the top of a pile hole, then filling gravels into the opening of the geogrid cylinder to form a reinforcement gravel pile, wherein the amount of the filled gravels ensures that the top mark energy of the reinforcement gravel pile reaches a preset elevation;
and S1005, after the gravel pile is formed for 4 days, injecting cement slurry into the hole in the gravel pile from the retained grouting pipe by using a high-pressure grouting pump to form a semi-rigid grouting gravel pile.
In step S1001 in the embodiment of the present invention, constructing a gravel pile construction platform includes the following steps:
s2001, arranging a through self-elevating platform in the middle of a gravel pile construction platform, oppositely arranging a pair of gantry structures on the self-elevating platform, enabling two ends of a main beam of each gantry structure to extend out of the self-elevating platform, horizontally arranging a track on the main beam, and arranging a truss crane on the track to enable the truss crane to move along the length direction of the track;
and S2002, connecting the vibroflot to the truss crane, and enabling the truss crane to drive the vibroflot to move left and right and lift up and down on the gravel pile construction platform.
In step S1002 in the present invention, the grouting pipes are steel pipes or PVC pipes, and the number of the grouting pipes is set to 5.
In step S1003 of the embodiment of the present invention, the method for filling crushed stone includes the following steps:
s3001, determining the pore ratio of dense and piled crushed stones and the expansion degree and viscosity of cement paste for forming cemented crushed stones;
s3002, vibrating by using a vibrator when the pile hole is backfilled with the crushed stone until the porosity ratio of the crushed stone reaches a preset value.
In step S1004, the sleeve outer diameter of the geogrid cylinder is 15mm smaller than the pile hole inner diameter, and the height is 3m.
In step S1005 of the embodiment of the present invention, the cement slurry is prepared by using cement of 32.5 grades or more, the water cement ratio is 0.4, the grouting amount is preferably that the specific gravity of the surface bleeding is not less than 1.2, and the grouting pressure is 0.2Mpa.
In step S1005 of the embodiment of the present invention, the cement slurry is an underwater self-protective self-compacting cement paste.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (3)
1. A construction method of a gravel pile hooped by immersed tube ribs for reinforcing a soft foundation is characterized by comprising the following steps:
s1001, building a gravel pile construction platform, dragging and transporting the gravel pile construction platform to a foundation, and arranging a gravel storage bin, a vibroflot and a vibrating immersed tube gravel pile machine on the gravel pile construction platform;
s1002, constructing on the ground of a foundation to form a pile hole, and uniformly and circumferentially installing a plurality of grouting pipes in the pile hole, wherein the grouting pipes are 0.2-0.3m higher than the ground so as to facilitate grouting; the grouting pipes are steel pipes or PVC pipes, and 4-6 grouting pipes are arranged;
s1003, mounting a pile pipe on the vibration immersed tube gravel pile machine, vibrating the immersed tube at a preset position of the foundation, and stopping vibrating after reaching a preset elevation; filling broken stones from a broken stone inlet at the top of the pile pipe, continuously supplementing broken stones in the vibrating pipe-pulling process and controlling the amount of broken stones so that the top surfaces of the broken stones are 3-6m away from the top of the pile hole;
s1004, placing the manufactured geogrid cylinder from the top of the pile hole, then pouring gravels into the opening of the geogrid cylinder to form a rib-hooped gravel pile, wherein the top mark energy of the rib-hooped gravel pile is ensured to reach a preset elevation by the aid of the poured gravels; the outer diameter of the sleeve of the geogrid cylinder is 10-20mm smaller than the inner diameter of the pile hole, and the height of the sleeve is 3m;
s1005, after the gravel pile is formed for 3-5 days, injecting cement slurry into the hole of the gravel pile from the retained grouting pipe by using a high-pressure grouting pump to form a semi-rigid grouting gravel pile; the cement paste is prepared by cement of more than 32.5 grades, the water cement ratio is 0.3-0.5, the grouting amount is preferably that the specific gravity of surface bleeding is not less than 1.2, and the grouting pressure is 0.1-0.5Mpa; the cement slurry is one of self-compacting cement mortar, self-compacting cement paste and underwater self-protecting self-compacting cement paste.
2. The method for constructing the immersed tube reinforcement gravel pile for reinforcing the soft foundation according to claim 1, wherein in the step S1001, the step of constructing the gravel pile construction platform comprises the following steps:
s2001, arranging a through self-elevating platform in the middle of a gravel pile construction platform, oppositely arranging a pair of gantry structures on the self-elevating platform, enabling two ends of a main beam of each gantry structure to extend out of the self-elevating platform, horizontally arranging a track on the main beam, and arranging a truss crane on the track to enable the truss crane to move along the length direction of the track;
and S2002, connecting the vibroflot to the truss crane, and enabling the truss crane to drive the vibroflot to move left and right and lift up and down on the gravel pile construction platform.
3. The method for constructing a sinking pipe reinforcement gravel pile for reinforcing a soft foundation according to claim 1, wherein in the step S1003, the method for pouring gravel comprises the following steps:
s3001, determining the pore ratio of dense and piled crushed stones and the expansion degree and viscosity of cement paste for forming cemented crushed stones;
s3002, vibrating by using a vibrator when the pile hole is backfilled with the crushed stone until the porosity ratio of the crushed stone reaches a preset value.
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| CN202211270932.9A CN115637689A (en) | 2021-08-03 | 2021-08-03 | Immersed tube reinforcement gravel pile construction method for reinforcing soft foundation |
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| CN202110887537.4A CN113585224A (en) | 2021-08-03 | 2021-08-03 | Immersed tube reinforcement gravel pile construction method for reinforcing soft foundation |
| CN202211270932.9A CN115637689A (en) | 2021-08-03 | 2021-08-03 | Immersed tube reinforcement gravel pile construction method for reinforcing soft foundation |
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| JP5404344B2 (en) * | 2009-11-25 | 2014-01-29 | 株式会社不動テトラ | Slag pile construction method |
| CN101892665A (en) * | 2010-07-27 | 2010-11-24 | 中冶沈勘工程技术有限公司 | Construction method for grouting and vibro-replacement stone pile composite foundation |
| CN102828498B (en) * | 2012-05-10 | 2014-08-20 | 湖南大学 | Method for constructing gravel pile of hoop of immersed tube for reinforcing soft foundation |
| CN104831699A (en) * | 2015-04-09 | 2015-08-12 | 中交第二航务工程局有限公司 | Self-elevating gravel pile construction platform |
| CN108411889B (en) * | 2018-03-07 | 2021-02-05 | 清华大学 | Structured cemented gravel pile and construction method thereof |
| CN112281799B (en) * | 2020-10-30 | 2021-09-14 | 华中科技大学 | First-dispersing and later-reinforcing pile construction method and construction device suitable for ultra-soft soil |
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