CN111005379A - Construction method for removing pile body of reinforced concrete cast-in-place pile - Google Patents
Construction method for removing pile body of reinforced concrete cast-in-place pile Download PDFInfo
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- CN111005379A CN111005379A CN201911211310.7A CN201911211310A CN111005379A CN 111005379 A CN111005379 A CN 111005379A CN 201911211310 A CN201911211310 A CN 201911211310A CN 111005379 A CN111005379 A CN 111005379A
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- 238000010276 construction Methods 0.000 title claims abstract description 46
- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 26
- 238000005553 drilling Methods 0.000 claims abstract description 105
- 230000002787 reinforcement Effects 0.000 claims abstract description 24
- 239000004567 concrete Substances 0.000 claims abstract description 15
- 239000002893 slag Substances 0.000 claims abstract description 13
- 230000005641 tunneling Effects 0.000 claims abstract description 6
- 239000002689 soil Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 239000004568 cement Substances 0.000 claims description 3
- 238000002203 pretreatment Methods 0.000 abstract description 2
- 238000009527 percussion Methods 0.000 description 6
- 230000003014 reinforcing effect Effects 0.000 description 5
- 238000011010 flushing procedure Methods 0.000 description 4
- 239000004484 Briquette Substances 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 210000003205 muscle Anatomy 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D9/00—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention provides a construction method for removing a reinforced concrete cast-in-place pile body, which comprises the following steps before a shield tunneling machine passes through: arranging a plurality of drilling positions on the end face of the pile body; drilling and coring along the length direction of the main reinforcement in the pile body at the drilling position; and (4) after drilling and coring are carried out on all the drilling positions, adopting an impact drill to impact the pile body, and clearing concrete broken slag of the pile body. According to the invention, the core drill is used for carrying out core pre-treatment on the pile body, the strength of the pile body is reduced after core is taken, and then the impact drill is used for directly crushing the pile body and completely removing the pile body, so that underground space operation is facilitated; the construction risk is reduced, the construction period is shortened, and the influence on surrounding buildings (structures) is reduced.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a construction method for removing a reinforced concrete cast-in-place pile body.
Background
In recent years, urban rail transit in China is rapidly developed, and on established or built rail lines, the phenomenon that the rail lines conflict with pile foundations of buildings (structures) is widely existed, usually, the rail lines are avoided through slope adjustment and line adjustment, but when the head and tail station positions of an interval are determined and basically established, the lines are difficult to adjust or bypass, and piles are ground to pass through.
The method of the shield machine direct grinding is adopted to pass through the pile body in the prior art, the pile body is not preprocessed, the direct pile grinding construction risk is large for some construction situations without a warehouse opening condition, the conditions of cutter disc transformation and cutter replacement are not available on site, long-time shutdown and huge economic loss are caused once a cutter is seriously abraded or a reinforcing steel bar screw clamping machine is used, and in addition, if the construction time is too long, serious safety accidents such as collapse, settlement and the like easily occur.
Disclosure of Invention
In view of the above situation, the invention provides a construction method for removing a pile body of a reinforced concrete cast-in-place pile, which solves the defects of the existing shield machine that the direct pile grinding risk is high, a cutter or a reinforcing steel bar screw clamping machine is easy to damage, the construction time is long, collapse, settlement and other serious safety accidents are easy to happen.
In order to achieve the purpose, the invention adopts the technical scheme that: the construction method for removing the pile body of the reinforced concrete cast-in-place pile is provided, and the following steps are carried out before the shield tunneling machine passes through:
arranging a plurality of drilling positions on the end face of the pile body;
drilling and coring along the length direction of the main reinforcement in the pile body at the drilling position;
and (4) after drilling and coring are carried out on all the drilling positions, adopting an impact drill to impact the pile body, and clearing concrete broken slag of the pile body.
The construction method for removing the pile body of the reinforced concrete cast-in-place pile is further improved in that when a plurality of drilling positions are distributed on the end face of the pile body, the pile head is removed and the position of a main rib is found, the position of the main rib is used as one part of the drilling position, and the other part of the drilling position is distributed on the position other than the position of the main rib.
The construction method for removing the pile body of the reinforced concrete cast-in-place pile is further improved in that the main reinforcement positions comprise a first main reinforcement position where the acoustic pipe is bound and a second main reinforcement position where the acoustic pipe is not bound; in the step of setting the drill hole position, comprising: determining a first drilling position according to the position of the first main rib and the position of the corresponding sounding pipe; determining a second drilling position according to the second main rib position; and a third drilling hole position is fully distributed at a position which is not the main rib position.
The construction method for removing the pile body of the reinforced concrete cast-in-place pile is further improved in that when the first drilling position, the second drilling position and the third drilling position are determined, the aperture of the first drilling position is set to be larger than the sum of the first main rib position and the diameter of the corresponding sound measurement pipe; setting the bore diameter of the second drilling location to be larger than the diameter of the second king wire location.
The construction method for removing the reinforced concrete cast-in-place pile body is further improved in that the third drilling holes are symmetrically distributed on the end face of the pile body.
The construction method for removing the reinforced concrete cast-in-place pile body is further improved in that the hole edge distance between the adjacent third drilling hole positions is 150-250 mm.
The construction method for removing the pile body of the reinforced concrete cast-in-place pile is further improved in that in the step of drilling and coring, coring is performed in sequence according to the first drilling position, the second drilling position and the third drilling position.
The construction method for removing the pile body of the reinforced concrete cast-in-place pile is further improved in that coring is performed according to a quincunx diagonal sequence when coring is performed on the first drilling position, the second drilling position or the third drilling position.
The construction method for removing the reinforced concrete cast-in-place pile body is further improved in that the impact drill comprises an impact drill bit and a slurry circulating system, and when the pile body is impacted by the impact drill: the impact drill bit impacts the pile body; the slurry circulating system carries out concrete broken slag of the pile body, and meanwhile, the magnet is adopted to suck out the steel bar broken slag in the pile body.
The construction method for removing the pile body of the reinforced concrete cast-in-place pile is further improved in that after concrete slag of the pile body is removed, cement soil or plain soil is adopted to backfill the space of the pile body.
Due to the adoption of the technical scheme, the invention has the following beneficial effects: the core drilling machine is used for carrying out core pre-treatment on the pile body, the strength of the pile body is reduced after core is taken, and then the impact drilling machine is used for directly crushing the pile body and completely removing the pile body, so that underground space operation is facilitated; the construction risk is reduced, the construction period is shortened, and the influence on surrounding buildings (structures) is reduced.
Drawings
FIG. 1 is a flow chart of the construction method of the present invention.
Fig. 2 is a pile drilling construction layout diagram in the construction method of the invention.
Detailed Description
In the tunnel construction process, the phenomenon that a track line conflicts with a building pile foundation widely exists, and in order to solve the problems of serious safety accidents such as high risk, easy damage to a cutter or a steel bar clamping screw machine, long construction time, easy collapse, settlement and the like existing in the method for removing the pile body by directly grinding the pile body by using a shield machine, the invention provides a construction method for removing the reinforced concrete cast-in-place pile body.
To facilitate an understanding of the present invention, the following description is made in conjunction with the accompanying drawings and examples.
Referring to fig. 1 and 2, the present invention provides a construction method for removing a reinforced concrete cast-in-place pile, which comprises the following steps before a shield tunneling machine passes through:
step 1, distributing a plurality of drilling positions on the end face of a pile body;
in this embodiment, the diameter of the pile body is 1.5m, is equipped with the steel reinforcement cage in the pile body, and the main muscle of steel reinforcement cage is gone up long setting along the outer lane of pile body, and the diameter is 18 mm. In order to greatly reduce the strength of the pile body and enable the impact drill to easily break the pile body, the invention provides the following preferred embodiment for determining the drilling position:
firstly, cleaning a covering body at the top of a pile body to enable main reinforcements to leak from the top surface of the pile body, and conveniently searching the positions of the main reinforcements, wherein if part of the main reinforcements in the pile body are damaged or inclined and all the positions of the main reinforcements cannot leak from the end surface of the pile body, a drill bit can be adopted to drill through concrete of the pile body to try to search the positions of the main reinforcements;
then, drilling positions are respectively arranged at the position corresponding to the main reinforcement position and the position corresponding to the non-main reinforcement position on the end surface of the pile body; wherein:
because the acoustic pipe a is usually bound on part of the main ribs in the pile body, the position corresponding to the main rib position in the embodiment includes a first main rib position where the acoustic pipe a is bound and a second main rib position where the acoustic pipe a is not bound, the outer ring scribing line of the first main rib position and the corresponding acoustic pipe a position in the embodiment is used as a first drilling position (e.g. 1-3 in fig. 2), and the aperture of the first drilling position (e.g. 1-3 in fig. 2) is preferably 110mm, so that the first main rib and the corresponding acoustic pipe a can be completely taken out when drilling and coring; marking an outer circle of the second main rib position as a second drilling position (4-20 in figure 2), wherein the aperture of the second drilling position (4-20 in figure 2) is preferably 89mm, so that the second main rib can be completely taken out when drilling and coring;
the part corresponding to the non-main reinforcement position is a pure concrete structure, and third drilling positions (such as 21-36 in fig. 2) are distributed at the part corresponding to the non-main reinforcement position, specifically, all the third drilling positions (such as 21-36 in fig. 2) are determined by scribing according to the distance between the adjacent third drilling positions (such as 21-36 in fig. 2), the distance between the third drilling positions (such as 21-36 in fig. 2) and the adjacent first drilling positions (such as 1-3 in fig. 2) or the adjacent second drilling positions (such as 4-20 in fig. 2) and the drilling construction sequence. In addition, in the embodiment, the aperture of the third drilling position (21-36 in FIG. 2) is preferably 110 mm; preferably, the third drilling positions (21-36 in figure 2) are symmetrically distributed on the top surface of the pile body; preferably, the distance between the hole edges of the adjacent third drilling positions (such as 21-36 in fig. 2) is 150-250 mm, so that the hole edges are not too close to each other, the drilling holes are prevented from being inclined due to external force, and the construction purpose cannot be achieved; preferably, the third drilling locations (e.g., 21-36 in FIG. 2) are spaced 165mm from adjacent hole edges of either the adjacent first drilling locations (e.g., 1-3 in FIG. 2) or the adjacent second drilling locations (e.g., 4-20 in FIG. 2). Through above-mentioned preferred mode, can reduce the intensity of pile body by a wide margin, reduce the drilling number of times simultaneously, improve the efficiency of construction, reduce the drilling risk, make the pile body after coring be honeycomb briquette form to when the follow-up pile body of assaulting, the pile body atress is balanced, the breakage is more thorough.
in this embodiment, the core drill is a fully hydraulic portable drill which has compact structure, small volume, light weight and convenient movement, and a field meeting the use requirement of the drill is provided on the site so as to be convenient for the drill to translate and fix. The core drill comprises a core drill bit and a flushing fluid circulating system, the core drill bit is used for drilling and coring, the flushing fluid circulating system is used for flushing and drilling holes while drilling holes and discharging generated broken slag, specifically, the core drill bit drills along the length direction of a main rib in a pile body, the pressure is applied according to the condition of the pile body, the light pressure and the slow rotating speed are started, the core drill bit is gradually shifted to be normal, the angle of the formed hole is checked every 1-2 m in the drilling process, the core drill bit meets the geology with a complex soil layer, the core drill bit is checked every 0.5-1 m, if the core drill bit is inclined, the drilling is stopped immediately, and; in order to prevent the instability of the hole wall at the edge and around the drill hole, the low solid phase slurry is preferably used as the flushing liquid, and the stability of the hole wall can be maintained while the slag is discharged. In the embodiment, the main reinforcement position is drilled, the non-main reinforcement position in the middle of the pile body is also drilled, and the concrete core at the non-main reinforcement position only contains a concrete structure, so that when the concrete core is taken out, the concrete core can be taken out in a sectional cutting mode for convenience of operation.
Further, since the present embodiment involves multiple, multiple boreholes, the present embodiment provides a preferred sequence of coring the boreholes: drilling coring is performed in the order of a first drilling position (e.g., 1-3 in FIG. 2), a second drilling position (e.g., 4-20 in FIG. 2), and a third drilling position (e.g., 21-36 in FIG. 2).
Further, when coring is performed on the first drilling positions (1-3 in figure 2) or the second drilling positions (4-20 in figure 2) or the third drilling positions (21-36 in figure 2), the drilling coring is performed according to a quincunx diagonal sequence, namely, the drilling coring is performed according to the sequence of 1-36 in figure 2 in sequence, so as to ensure the quality of coring.
Specifically, in the embodiment, holes are sequentially drilled in the order of 1-3 according to a first drilling position (1-3 in fig. 2) and the first main rib and the sound measuring tube a bound with the first main rib are taken out; then, sequentially drilling holes according to a second drilling position (such as 4-20 in the figure 2) in a sequence of 4-20, and taking out a second main rib which is not bound with the sound measuring tube A; and finally, sequentially drilling holes according to the third drilling positions (21-36 in the figure 2) in the order of 21-36 and taking out the concrete core.
Adopt above-mentioned mode to drill the core to the pile body, make the pile body be the honeycomb briquette form, reduce the intensity of pile body, it provides convenience to strike the pile body for follow-up percussion drill.
In this embodiment, the percussion drill includes percussion bit and mud circulation system, when adopting percussion drill to strike the pile body: the impact drill bit impacts the pile body; the slurry circulating system carries out concrete broken slag of the pile body; in addition, because the internal reinforcing bar such as cramp, rib still exists in addition to the main muscle in the stake, when the core is got in drilling moreover, also probably cause the residue of a small amount of reinforcing bar because of circumstances such as drilling inclination or reinforcing bar bending, so, this embodiment is preferred when adopting the percussion drill to strike the stake body, adopts the interior remaining reinforcing bar piece of magnet suction stake body, specifically, hangs the magnet and puts to the stake body bottom, and the reinforcing bar piece is adsorbed naturally to the magnet after sinking the end, then it can to take out the magnet.
Further, in order to enable the subsequent shield tunneling machine to smoothly pass through the area provided with the pile body, in this embodiment, after the pile body is removed, cement soil or plain soil is adopted to backfill the space where the pile body is removed, and after the backfill meets the requirements, a tamping machine is used for compacting.
According to the invention, through the combined construction process of the core drill and the impact drill, the pile body can be easily crushed and thoroughly cleaned, and a space is provided for the subsequent shield tunneling machine to pass through construction.
While the present invention has been described in detail and with reference to the accompanying drawings and examples, it will be apparent to one skilled in the art that various changes and modifications can be made therein. Therefore, certain details of the embodiments are not to be interpreted as limiting, and the scope of the invention is to be determined by the appended claims.
Claims (10)
1. A construction method for removing a reinforced concrete cast-in-place pile body is characterized by comprising the following steps before a shield tunneling machine passes through:
arranging a plurality of drilling positions on the end face of the pile body;
drilling and coring along the length direction of the main reinforcement in the pile body at the drilling position;
and (4) after drilling and coring are carried out on all the drilling positions, adopting an impact drill to impact the pile body, and clearing concrete broken slag of the pile body.
2. The construction method for removing a pile body of a reinforced concrete bored pile according to claim 1, wherein when a plurality of drilling positions are provided on an end face of the pile body, a pile head is removed and a main reinforcement position is searched, and the main reinforcement position is used as a part of the drilling positions, and another part of the drilling positions is provided over a portion other than the main reinforcement position.
3. The construction method for removing the pile body of the reinforced concrete cast-in-place pile according to claim 2, wherein the main rib positions comprise a first main rib position where the acoustic pipe is bound and a second main rib position where the acoustic pipe is not bound; in the step of setting the drill hole position, comprising: determining a first drilling position according to the position of the first main rib and the position of the corresponding sounding pipe; determining a second drilling position according to the second main rib position; and a third drilling hole position is fully distributed at a position which is not the main rib position.
4. The construction method for removing a pile body of a reinforced concrete cast-in-place pile according to claim 3, wherein in determining the first, second and third drilling positions, the aperture of the first drilling position is set to be larger than the sum of the first main bar position and the diameter of the corresponding sounding pipe; setting the bore diameter of the second drilling location to be larger than the diameter of the second king wire location.
5. The construction method for removing the pile body of the reinforced concrete cast-in-place pile as claimed in claim 3, wherein the third drilling positions are symmetrically distributed on the end face of the pile body.
6. The construction method for pile body pretreatment in the shield pile grinding process according to claim 5, wherein the hole edge distance between adjacent third drilling positions is 150-250 mm.
7. The construction method for removing a pile body of a reinforced concrete cast-in-place pile according to any one of claims 3 to 6, wherein in the step of performing core drilling, core drilling is performed in the order of the first drill hole position, the second drill hole position, and the third drill hole position.
8. The construction method for removing a pile body of a reinforced concrete cast-in-place pile according to claim 7, wherein coring is performed in a quincunx diagonal order when performing the drilling coring on the first drilling position, the second drilling position, or the third drilling position.
9. The construction method for removing the pile body of the reinforced concrete cast-in-place pile according to claim 1, wherein the impact drill comprises an impact drill bit and a slurry circulating system, and when the pile body is impacted by the impact drill: the impact drill bit impacts the pile body; the slurry circulating system carries out concrete broken slag of the pile body, and meanwhile, the magnet is adopted to suck out the steel bar broken slag in the pile body.
10. The construction method for removing the pile body of the reinforced concrete cast-in-place pile according to claim 1, wherein after concrete slag of the pile body is removed, the space of the pile body is backfilled with cement soil or plain soil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911211310.7A CN111005379A (en) | 2019-12-02 | 2019-12-02 | Construction method for removing pile body of reinforced concrete cast-in-place pile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911211310.7A CN111005379A (en) | 2019-12-02 | 2019-12-02 | Construction method for removing pile body of reinforced concrete cast-in-place pile |
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| CN111005379A true CN111005379A (en) | 2020-04-14 |
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| CN201911211310.7A Pending CN111005379A (en) | 2019-12-02 | 2019-12-02 | Construction method for removing pile body of reinforced concrete cast-in-place pile |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112064641A (en) * | 2020-09-08 | 2020-12-11 | 成都大家液压机械有限公司 | Method for breaking pile head of cast-in-place pile |
| CN113356206A (en) * | 2021-06-28 | 2021-09-07 | 中铁十六局集团地铁工程有限公司 | Construction method for breaking existing pile foundation |
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2019
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Application publication date: 20200414 |