CN114215069A - Self-stabilizing foundation pit support combined construction method - Google Patents
Self-stabilizing foundation pit support combined construction method Download PDFInfo
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- CN114215069A CN114215069A CN202111521572.0A CN202111521572A CN114215069A CN 114215069 A CN114215069 A CN 114215069A CN 202111521572 A CN202111521572 A CN 202111521572A CN 114215069 A CN114215069 A CN 114215069A
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- 238000010276 construction Methods 0.000 title claims abstract description 93
- 238000003466 welding Methods 0.000 claims abstract description 36
- 238000001514 detection method Methods 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 22
- 239000002689 soil Substances 0.000 claims abstract description 21
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 8
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 27
- 229910000831 Steel Inorganic materials 0.000 claims description 22
- 239000010959 steel Substances 0.000 claims description 22
- 230000000694 effects Effects 0.000 claims description 19
- 230000035515 penetration Effects 0.000 claims description 12
- 238000011084 recovery Methods 0.000 claims description 9
- 230000003014 reinforcing effect Effects 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 8
- 230000003068 static effect Effects 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 239000011440 grout Substances 0.000 claims description 4
- 229920000742 Cotton Polymers 0.000 claims description 3
- 241000221535 Pucciniales Species 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 239000011083 cement mortar Substances 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 230000007547 defect Effects 0.000 claims description 3
- 238000010891 electric arc Methods 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 3
- 239000011780 sodium chloride Substances 0.000 claims description 3
- 230000002194 synthesizing effect Effects 0.000 claims description 3
- 230000003044 adaptive effect Effects 0.000 claims description 2
- 230000002706 hydrostatic effect Effects 0.000 claims description 2
- 238000009435 building construction Methods 0.000 abstract description 3
- 239000004568 cement Substances 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 abstract description 2
- 239000002002 slurry Substances 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 244000208734 Pisonia aculeata Species 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
- E02D7/20—Placing by pressure or pulling power
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a self-stabilizing foundation pit support combined construction method, which relates to the technical field of building construction and comprises the following specific steps: firstly, hoisting; secondly, angle control; thirdly, pile sinking; fourthly, welding; fifthly, grouting; sixthly, binding the ring beam reinforcing steel bars; seventhly, detection is carried out; eighthly, detecting and recovering. The inclined pile is adopted to replace the traditional cement concrete support, the original complex support system is replaced, the construction content is reduced, meanwhile, the inclined pile is adopted to support, the construction speed is high, the construction can be carried out in the open-type excavated earthwork environment, the construction period is reduced, the support system is constructed in a mode of matching the inclined pile and grouting, the support construction maintenance and dismantling working conditions are not needed, the underground structure construction can be carried out continuously, the support strength is ensured, the inclined pile is sunk into the soil layer, grouting is carried out in the inclined pile, the subsequent support replacing process is not needed, and the construction cost is greatly saved.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a self-stabilizing foundation pit supporting combined construction method.
Background
The foundation pit support is a supporting, retaining, reinforcing and protecting measure adopted for the side wall of the foundation pit and the surrounding environment in order to ensure the safety of the construction of an underground structure and the surrounding environment of the foundation pit, and is a particularly key part in the building construction.
The traditional horizontal inner support is high in manufacturing cost, long in period, slow in soil excavation and complex in dismantling, part of foundation pit engineering is simple in surrounding environment, the requirement for deformation control of the foundation pit is relatively low, the horizontal inner support does not need to be adopted, a bottom plate of the traditional inclined throwing support is poured in blocks, a plurality of construction joints are generated, the reserved earthwork is located at the bottom of the inclined throwing support, the unearthing difficulty is large, the efficiency is low, the unearthing comprehensive cost is high, the unearthing construction period is long, and the reserved earthwork does not have an unearthing condition for part of foundation pit engineering. Therefore, it is necessary to provide a self-stabilizing foundation pit supporting and protecting combined construction method to solve the above problems.
Disclosure of Invention
The invention aims to provide a self-stabilizing foundation pit support combined construction method to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a self-stabilizing foundation pit support combined construction method comprises the following specific steps:
firstly, hoisting, namely selecting an adaptive inclined pile according to construction standards and construction environments, paying attention to whether rust exists on the surface of the inclined pile, whether obvious defects exist on the surface of the inclined pile and whether the thickness of the inclined pile meets the standards when selecting the inclined pile, and allocating a pile hoisting machine to hoist the inclined pile;
secondly, angle control, namely calculating the inserting angle of the inclined pile according to a construction drawing and a construction environment, constructing a three-dimensional model to ensure that the soil penetration angle of the inclined pile meets the construction standard, moving the inclined pile by using a pile lifting machine to enable the bottom end of the inclined pile to move to the soil penetration position, and moving the top end of the inclined pile by using the pile lifting machine until the soil penetration angle of the inclined pile reaches the construction standard;
thirdly, pile sinking, namely pressing the inclined piles into a soil layer according to a preset angle, wherein the pile sinking depth is strictly executed according to the construction standard, and when the length of the inclined piles does not reach the construction standard, pile sinking is completed in a mode of splicing a plurality of inclined piles so as to ensure that the pile sinking depth reaches the construction standard;
welding, namely welding and reinforcing the joint of the inclined pile to ensure that the settlement depth of the inclined pile meets the construction requirement, welding the inclined pile by adopting an argon arc welding or electric arc welding mode, detecting a welding seam after welding is finished, and performing repair welding on unqualified parts;
grouting, namely performing grouting treatment on the interior of the inclined pile in a static pressure grouting mode, inspecting the interior of the inclined pile before grouting, and performing grouting after the grouting standard is met;
sixthly, binding the ring beam reinforcing steel bars, calculating binding positions of the ring beam reinforcing steel bars according to a construction drawing, and in the binding process of the ring beam reinforcing steel bars, paying attention to the fact that the distance between stirrups is not more than 300 mm;
detecting, namely detecting the grouting effect and the connection position of the inclined pile, and detecting by adopting a standard penetration or static sounding method when detecting the grouting effect, wherein the number of grouting effect detection points is 2-5% of the number of grouting holes, the rejection rate of the detection points is more than or equal to 20%, or the average value of the detection points does not reach the construction standard, and implementing repeated grouting on unqualified grouting areas;
eighthly, detection and recovery are carried out, areas such as holes and cutting caused by grouting effect detection and batter pile detection are filled, the filling and the repairing of a grouting area can be carried out by adopting cement mortar, the filling and the repairing of a batter pile area can be carried out by adopting a welding mode, the recovery standard is that the detection area is basically flush with the surface of an original construction area, and no obvious recess or protrusion exists in the recovery area.
Preferably, in the first step, when the rust on the surface of the inclined pile is heavy, the rust should be cleaned, and the specific cleaning process is as follows:
1) a cleaning brush is used for wiping off large rusts on the surface of the inclined pile;
2) synthesizing rust removers by using hydrochloric acid, sodium chloride and the like, coating the rust removers on the surface of the inclined pile by using a brush, and removing rust on the surface of the inclined pile;
3) and (3) wiping the surface of the inclined pile by using cotton cloth, sponge and the like, and wiping off rust stains on the surface of the inclined pile and the residual rust remover.
Preferably, in the second step, when the inclined pile is moved by the pile crane, a warning line or an isolation zone is used for isolating and controlling a moving area of the inclined pile, meanwhile, a specially-assigned person is dispatched to clear the field in the construction process, manual positioning is avoided as much as possible in the positioning process of the bottom end of the inclined pile, if the manual positioning is used, after the positioning of the bottom end of the inclined pile is completed, workers should withdraw in time, and after the angle of the inclined pile is determined, the inclined pile is temporarily fixed by a fixing component.
Preferably, in the third step, pile sinking operation can be performed by adopting a hydrostatic pile pressing mode, in the pile sinking process, an included angle between the inclined pile and the construction ground needs to be closely concerned, and if the included angle changes, pile sinking operation needs to be stopped immediately, and the angle of the inclined pile is corrected.
Preferably, in the fourth step, before welding the inclined pile joint, cleaning soil at the welded joint to ensure a welding effect.
Preferably, in the fifth step, the slurry must be fully and uniformly stirred by the stirrer to start the pressure injection, the stirring should be kept during the slurry injection process, and the stirring time should be less than the primary setting time of the slurry.
Preferably, in the sixth step, the binding process of the ring beam steel bars is as follows:
1) constructing a construction template according to the actual environment of a construction site, and preparing a skid and a rust remover;
2) derusting the steel bars by a derusting agent, and checking the types and the number of the steel bars;
3) snapping lines on the template according to the construction drawing and the requirement of the distance between the stirrups, and placing and positioning the stirrups according to the ink lines;
4) the stressed steel bars are penetrated into the stirrups, the stressed steel bars and the stirrups are bound through binding wires, the stirrups are perpendicular to the stressed steel bars during binding, and the joint positions of the stirrups are staggered along the direction of the stressed steel bars;
5) after the binding is finished, a cushion block is added, the binding points of the binding wires are checked, and binding points which are not in accordance with the standard is performed again.
The invention has the technical effects and advantages that:
1. the inclined piles are adopted to replace the traditional cement concrete support, the original complex support system is replaced, the construction content is reduced, meanwhile, the inclined piles are adopted to support, the construction speed is high, construction can be carried out in an open-type excavated earthwork environment, and the construction period is shortened;
2. according to the invention, the support system is constructed by adopting the mode of matching the inclined piles and grouting, the support construction maintenance and dismantling working conditions are not needed, the underground structure construction can be continuously carried out, and the support strength is ensured;
3. according to the invention, the inclined pile is sunk into the soil layer, and grouting is carried out in the inclined pile, so that a subsequent support replacing procedure is not required, and the construction cost is greatly saved;
4. according to the invention, the inclined piles and the ring beam steel bars are arranged, and the ring beam steel bars are subjected to concrete pouring according to the construction standard, so that the omnibearing protection of the foundation pit can be realized, the front support type support constructed by the inclined piles can be cut off after the foundation pit is backfilled, and the deformation of the foundation pit is completely controllable;
5. according to the invention, through construction by adopting the inclined pile grouting mode, the using amount of reinforcing steel bars and concrete is reduced, secondary noise and dust pollution to the environment during support dismantling are avoided, a post-cast strip is not required to be reserved after construction is finished, and the influence of the post-cast strip on later construction is avoided.
Drawings
FIG. 1 is a schematic view of a front support structure of the present invention.
Fig. 2 is a schematic view of a pull-back configuration of the present invention.
In the figure: 1. a front support structure; 11. pile arrangement; 12. front supporting piles; 13. reinforcing bars; 2. a back-pull structure; 21. double rows of piles; 22. and (5) pulling the pile.
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 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 invention provides a self-stabilizing foundation pit supporting combined construction method shown in figures 1-2, which comprises the following specific steps:
the utility model provides a, hoist and mount, according to construction standard and construction environment, select the batter pile of adaptation, should notice when selecting the batter pile whether there is the rust on the surface of batter pile, whether there is obvious defect on the surface of batter pile to and the thickness of batter pile accords with the standard, allotment pile hoist machine hoists the batter pile, and when the rust on batter pile surface is heavier, should clear up the rust, and concrete clearance flow is:
1) a cleaning brush is used for wiping off large rusts on the surface of the inclined pile;
2) synthesizing rust removers by using hydrochloric acid, sodium chloride and the like, coating the rust removers on the surface of the inclined pile by using a brush, and removing rust on the surface of the inclined pile;
3) wiping the surface of the inclined pile by using cotton cloth, sponge and the like, and wiping off rust stains on the surface of the inclined pile and the residual rust remover;
secondly, angle control, calculating an inclined pile insertion angle according to construction drawings and construction environments, constructing a three-dimensional model to ensure that the soil penetration angle of the inclined pile meets construction standards, moving the inclined pile by using a pile lifting machine to enable the bottom end of the inclined pile to move to the soil penetration position, moving the top end of the inclined pile by using the pile lifting machine until the soil penetration angle of the inclined pile reaches the construction standards, isolating and controlling a moving area of the inclined pile by using a warning line or an isolation belt when the pile lifting machine moves the inclined pile, meanwhile, dispatching a special person to clear the field in the construction process, avoiding manual positioning as much as possible in the positioning process of the bottom end of the inclined pile, and if the manual positioning is used, after the positioning of the bottom end of the inclined pile is completed, timely withdrawing workers, and after the inclined pile angle is determined, temporarily fixing the inclined pile by using a fixing assembly;
thirdly, pile sinking, namely pressing the inclined piles into a soil layer according to a preset angle, wherein the pile sinking depth is strictly executed according to a construction standard, when the length of the inclined piles does not reach the construction standard, pile sinking work is completed in a mode of splicing a plurality of inclined piles to ensure that the pile sinking depth reaches the construction standard, the pile sinking work can be performed in a mode of hydraulic static pile pressing, in the pile sinking process, an included angle between the inclined piles and the construction ground needs to be closely concerned, if the included angle changes, pile sinking work needs to be immediately stopped, and the angle of the inclined piles is corrected;
welding, namely welding and reinforcing the joint of the inclined pile to ensure that the settlement depth of the inclined pile meets the construction requirement, welding the inclined pile by adopting an argon arc welding or electric arc welding mode, detecting a welding seam after welding, performing repair welding on unqualified parts, and cleaning soil at the welding position before welding the joint of the inclined pile to ensure the welding effect;
grouting, namely grouting the interior of the inclined pile by adopting a static pressure grouting mode, inspecting the interior of the inclined pile before grouting, and grouting after the grouting standard is met, wherein grouting can be started after the grout is fully and uniformly stirred by a stirrer, pressure grouting can be started, stirring is kept in the grouting process, and the stirring time is less than the primary solidification time of the grout;
sixthly, the ligature of circle roof beam reinforcing bar according to the construction drawing, calculates the ligature position of circle roof beam reinforcing bar, and the ligature in-process of circle roof beam reinforcing bar should be noted that the stirrup interval is not more than 300mm, and the ligature flow of circle roof beam reinforcing bar is:
1) constructing a construction template according to the actual environment of a construction site, and preparing a skid and a rust remover;
2) derusting the steel bars by a derusting agent, and checking the types and the number of the steel bars;
3) snapping lines on the template according to the construction drawing and the requirement of the distance between the stirrups, and placing and positioning the stirrups according to the ink lines;
4) the stressed steel bars are penetrated into the stirrups, the stressed steel bars and the stirrups are bound through binding wires, the stirrups are perpendicular to the stressed steel bars during binding, and the joint positions of the stirrups are staggered along the direction of the stressed steel bars;
5) after binding is finished, adding a cushion block, checking binding points of the binding wires, and binding the binding points out of the standard again;
detecting, namely detecting the grouting effect and the connection position of the inclined pile, and detecting by adopting a standard penetration or static sounding method when detecting the grouting effect, wherein the number of grouting effect detection points is 2-5% of the number of grouting holes, the rejection rate of the detection points is more than or equal to 20%, or the average value of the detection points does not reach the construction standard, and implementing repeated grouting on unqualified grouting areas;
eighthly, detection and recovery are carried out, areas such as holes and cutting caused by grouting effect detection and batter pile detection are filled, the filling and the repairing of a grouting area can be carried out by adopting cement mortar, the filling and the repairing of a batter pile area can be carried out by adopting a welding mode, the recovery standard is that the detection area is basically flush with the surface of an original construction area, and no obvious recess or protrusion exists in the recovery area.
When the invention is constructed, the combination construction of the front bracing structure 1 and the rear pulling structure 2 is selected according to the actual environment of a construction site, and when the rear pulling structure 2 is constructed, double rows of piles 21 are required to be constructed.
After the construction is completed, when the foundation pit has a horizontal displacement trend, the front supporting piles 12 can support the top ends of the row piles 11, the back pull piles 22 can pull back the double-row piles 21, and the front supporting piles 12 are matched with the back pull piles 21, so that the row piles 11 and the row piles 21 can be effectively fixed, the foundation pit is prevented from deforming, and the horizontal displacement resistance function of the support is improved;
when the foundation pit has a soil mass uplift trend, the reinforcement 13 can press down the soil mass for limiting, and meanwhile, the front support pile 12 can reinforce the reinforcement 13 to avoid the soil mass uplift, so that the support uplift resistance function is improved;
when there is the tendency of toppling in the foundation ditch, preceding stake 12 can play the effect of location to the top of campshed 11, draws the effect that stake 22 can play the location to the top of double row stake 21 after simultaneously to make the top position of campshed 11 and double row stake 21 fixed, in order to reach the purpose of avoiding the foundation ditch to topple, thereby make the effect of strutting the antidumping promote.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (7)
1. A self-stabilizing foundation pit support combined construction method is characterized by comprising the following specific steps:
firstly, hoisting, namely selecting an adaptive inclined pile according to construction standards and construction environments, paying attention to whether rust exists on the surface of the inclined pile, whether obvious defects exist on the surface of the inclined pile and whether the thickness of the inclined pile meets the standards when selecting the inclined pile, and allocating a pile hoisting machine to hoist the inclined pile;
secondly, angle control, namely calculating the inserting angle of the inclined pile according to a construction drawing and a construction environment, constructing a three-dimensional model to ensure that the soil penetration angle of the inclined pile meets the construction standard, moving the inclined pile by using a pile lifting machine to enable the bottom end of the inclined pile to move to the soil penetration position, and moving the top end of the inclined pile by using the pile lifting machine until the soil penetration angle of the inclined pile reaches the construction standard;
thirdly, pile sinking, namely pressing the inclined piles into a soil layer according to a preset angle, wherein the pile sinking depth is strictly executed according to the construction standard, and when the length of the inclined piles does not reach the construction standard, pile sinking is completed in a mode of splicing a plurality of inclined piles so as to ensure that the pile sinking depth reaches the construction standard;
welding, namely welding and reinforcing the joint of the inclined pile to ensure that the settlement depth of the inclined pile meets the construction requirement, welding the inclined pile by adopting an argon arc welding or electric arc welding mode, detecting a welding seam after welding is finished, and performing repair welding on unqualified parts;
grouting, namely performing grouting treatment on the interior of the inclined pile in a static pressure grouting mode, inspecting the interior of the inclined pile before grouting, and performing grouting after the grouting standard is met;
sixthly, binding the ring beam reinforcing steel bars, calculating binding positions of the ring beam reinforcing steel bars according to a construction drawing, and in the binding process of the ring beam reinforcing steel bars, paying attention to the fact that the distance between stirrups is not more than 300 mm;
detecting, namely detecting the grouting effect and the connection position of the inclined pile, and detecting by adopting a standard penetration or static sounding method when detecting the grouting effect, wherein the number of grouting effect detection points is 2-5% of the number of grouting holes, the rejection rate of the detection points is more than or equal to 20%, or the average value of the detection points does not reach the construction standard, and implementing repeated grouting on unqualified grouting areas;
eighthly, detection and recovery are carried out, areas such as holes and cutting caused by grouting effect detection and batter pile detection are filled, the filling and the repairing of a grouting area can be carried out by adopting cement mortar, the filling and the repairing of a batter pile area can be carried out by adopting a welding mode, the recovery standard is that the detection area is basically flush with the surface of an original construction area, and no obvious recess or protrusion exists in the recovery area.
2. The self-stabilizing foundation pit support combination construction method according to claim 1, wherein in the first step, when rust on the surface of the inclined pile is heavy, the rust should be cleaned, and the specific cleaning process is as follows:
1) a cleaning brush is used for wiping off large rusts on the surface of the inclined pile;
2) synthesizing rust removers by using hydrochloric acid, sodium chloride and the like, coating the rust removers on the surface of the inclined pile by using a brush, and removing rust on the surface of the inclined pile;
3) and (3) wiping the surface of the inclined pile by using cotton cloth, sponge and the like, and wiping off rust stains on the surface of the inclined pile and the residual rust remover.
3. The self-stabilizing foundation pit supporting combination construction method according to claim 2, wherein in the second step, when the inclined pile is moved by the pile hanging machine, a guard line or an isolation belt is used for isolating and controlling the moving area of the inclined pile, meanwhile, a specially-assigned person is dispatched to clear the site during the construction process, manual positioning is avoided as much as possible during the positioning of the bottom end of the inclined pile, and if the manual positioning is used, after the positioning of the bottom end of the inclined pile is completed, workers should withdraw in time, and after the angle of the inclined pile is determined, the inclined pile should be temporarily fixed by a fixing component.
4. The self-stabilizing foundation pit supporting and combining construction method according to claim 3, wherein in the third step, pile sinking can be performed by means of hydrostatic pile pressing, in the pile sinking process, the included angle between the inclined pile and the construction ground needs to be closely paid attention to, if the included angle changes, the pile sinking work needs to be stopped immediately, and the angle of the inclined pile needs to be corrected.
5. The self-stabilizing foundation pit support combination construction method according to claim 4, wherein in the fourth step, before welding the inclined pile joint, cleaning soil at the welding position to ensure the welding effect.
6. The self-stabilizing foundation pit support combination construction method according to claim 5, wherein in the fifth step, the grouting can be started only after the grout is fully and uniformly stirred by the stirrer, the stirring is kept in the grouting process, and the stirring time is shorter than the primary setting time of the grout.
7. The self-stabilizing foundation pit support combined construction method according to claim 6, wherein in the sixth step, the binding flow of the ring beam steel bars is as follows:
1) constructing a construction template according to the actual environment of a construction site, and preparing a skid and a rust remover;
2) derusting the steel bars by a derusting agent, and checking the types and the number of the steel bars;
3) snapping lines on the template according to the construction drawing and the requirement of the distance between the stirrups, and placing and positioning the stirrups according to the ink lines;
4) the stressed steel bars are penetrated into the stirrups, the stressed steel bars and the stirrups are bound through binding wires, the stirrups are perpendicular to the stressed steel bars during binding, and the joint positions of the stirrups are staggered along the direction of the stressed steel bars;
5) after the binding is finished, a cushion block is added, the binding points of the binding wires are checked, and binding points which are not in accordance with the standard is performed again.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110725306A (en) * | 2019-10-31 | 2020-01-24 | 上海长凯岩土工程有限公司 | Construction method for forming oblique stress body by using rigid insert |
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