CN111424669A - Pile end grouting process and device of quick and recyclable grouting device - Google Patents
Pile end grouting process and device of quick and recyclable grouting device Download PDFInfo
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- CN111424669A CN111424669A CN202010228117.0A CN202010228117A CN111424669A CN 111424669 A CN111424669 A CN 111424669A CN 202010228117 A CN202010228117 A CN 202010228117A CN 111424669 A CN111424669 A CN 111424669A
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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
- 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
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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
- E02D5/62—Compacting the soil at the footing or in or along a casing by forcing cement or like material through tubes
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to a pile end grouting process capable of rapidly and recycling a grouting device, which sequentially comprises the following steps: a core drilling guide pipe is pre-embedded in a pile body of the engineering pile, and a set distance I is reserved between the bottom of the core drilling guide pipe and the pile bottom; drilling a set distance I from the core drilling guide pipe downwards to the bottom of the pile by using a core drilling machine; a grouting pipe is placed down along the drill core guide pipe, so that when the grouting device is in place, the bottom of the grouting pipe can exceed the pile bottom of the engineering pile by a set distance II; locking the top of the grouting device, and applying vertical pressure to the elastic sealing material to transversely expand the elastic sealing material so as to seal the core drilling conduit; grouting is carried out; and releasing the vertical pressure applied to the elastic sealing material, releasing the locking of the top of the grouting device, and recovering the grouting pipe and the grouting device. The invention does not need to open the plug at regular time after forming the pile, and does not need to repeatedly open the plug by clear water on site to prevent the grouting channel from being blocked; the recyclable slip casting device can be recycled; the grouting pipe pre-buried in the pile head does not need to be protected, and the management difficulty of a construction site is obviously reduced.
Description
Technical Field
The invention relates to a pile end grouting process, in particular to a pile end grouting process and a pile end grouting device capable of rapidly and recycling a grouting device, and belongs to the technical field of geotechnical engineering.
Background
According to the standard requirements, at least 2-3 grouting pipes are pre-embedded in the pile body according to the diameter of the pile body, and the plug is opened for 1-2 times by using high-pressure clear water within a specified time after the pile is formed.
The principle is that after the pouring of the pile body concrete is finished and the pile body concrete is initially set for a period of time, high-pressure water is used for flushing the concrete cement to form a grouting channel (called as 'plug opening'), as shown in figure 1. And (3) performing pile end grouting construction 3-5 days after the opening of the plug through the grouting channels. The problems existing in the prior art are as follows:
1) the opening time is determined by a design unit according to the soil layer property and engineering practical experience. In order to form a reliable grouting channel, the grouting channel needs to be blocked again by grout injected by other surrounding piles after the grouting channel is opened, and generally, continuous construction must be carried out for 24 hours to ensure that the plugging operation is finished within a specified time after the pile is formed.
2) When the engineering pile is constructed in a large scale, the pile forming time is sequential, and the plugging and grouting processes of adjacent pile foundations are mutually influenced. The grouting channel formed after the traditional grouting process is plugged is directly communicated with a soil layer, and the phenomenon of slurry channeling of cement slurry in the soil layer can occur after the grouting of the adjacent pile, so that the grouting channel of other plugged pile foundations is blocked. In order to avoid the situation, after one pile is grouted, the operation of opening the plug by clear water needs to be repeatedly carried out on the adjacent pile to keep the grouting channel smooth. The process consumes a large amount of manpower and material resources, and the success rate of subsequent pile foundation grouting is difficult to ensure.
3) The construction site is often complex in environment, excavation and filling operations are frequent, and various kinds of construction machines are available. The embedded grouting pipe and the screw thread of the pile head are very easy to be buried or damaged, so that the subsequent grouting operation cannot be implemented.
In summary, the traditional grouting method is time-consuming and labor-consuming, the plugging grouting procedure is complicated, the slurry channeling phenomenon is frequent, the grouting success rate is difficult to guarantee, the field protection is difficult, the requirement on constructors is high, and the construction period is seriously influenced.
Disclosure of Invention
The invention aims to provide a pile end grouting process capable of rapidly and recycling a grouting device, and solves the following technical problems that 1) a plurality of grouting pipes need to be embedded before pile forming; 2) the plug opening operation needs 24 hours for continuous construction after pile forming; 3) the adjacent pile foundation is plugged by grouting and slurry channeling, so that the grouting channel with the opened plug of the adjacent pile foundation is plugged; 4) the pile head grouting pipe is difficult to protect after the pile is formed; 5) the grouting success rate is low, and the construction speed is low.
The invention adopts the following technical means,
a pile end grouting process of a quick and recyclable grouting device sequentially comprises the following steps: a core drilling guide pipe 7 is embedded in a pile body of the engineering pile, and a set distance I is reserved between the bottom of the core drilling guide pipe 7 and the pile bottom; drilling downwards from the core drilling guide pipe 7 to the pile bottom by the set distance I by using a core drilling machine; the lower part of the grouting device is connected with a grouting pipe, and the grouting pipe is lowered along the drill core guide pipe 7, so that when the grouting device is in place, the bottom of the grouting pipe can exceed the pile bottom of the engineering pile by a set distance II; locking the top of the grouting device, and applying vertical pressure to the elastic sealing material to transversely expand the elastic sealing material so as to seal the core drilling conduit; grouting is carried out; and releasing the vertical pressure applied to the elastic sealing material, contracting the elastic sealing material, releasing the sealing, releasing the locking of the top of the grouting device, and recovering the grouting pipe and the grouting device.
The scheme changes the mode of forming the grouting channel by the traditional pile end grouting process, and the high-pressure water is used for flushing the concrete cement to form the grouting channel; after the concrete is hardened, drilling pile bottom concrete in the embedded PVC or core drilling pipe by using a core drilling machine to form a grouting channel; the operation steps of the traditional pile end grouting process are simplified, and the complicated process of repeated opening of the plug is omitted; and is not influenced by the time difference of pile foundation construction plug opening and grouting processes. Every stake slip casting passageway is opened promptly and is used, and adjacent pile foundation slip casting can not produce adverse effect to facing the stake, has greatly improved the slip casting success rate.
Preferably, the set distance i is at least 0.5 m.
Preferably, the set distance II is 400-600 mm.
Preferably, the elastic sealing material is rubber.
A pile end grouting device of a quick and recyclable grouting device is used for the pile end grouting process of the quick and recyclable grouting device; comprises a core drilling guide pipe 7, a grouting pipe 8 and a rubber column 4; a metal plate 5 with the outer diameter smaller than the inner diameter of the drill core guide pipe 7 is welded and fixed on the periphery of the grouting pipe 8; a plurality of rubber columns 4 are sleeved on the grouting pipe 8, and adjacent rubber columns 4 are separated by metal columns 3; the upper part of the grouting pipe 8 is provided with a section of external thread, and the uppermost metal column 3 is vertically extruded by adopting the nut 1 matched with the external thread, so that the rubber column 4 radially expands to form sealing with the drill core guide pipe 7.
The specially-made grouting device adopts the rubber column with the proper Poisson ratio, utilizes the characteristic that the rubber column expands laterally after being pressed axially, applies axial force to the rubber column by screwing up the upper nut, so that the rubber column expands laterally to seal the core drilling guide pipe, and achieves the effect of safely and efficiently performing high-pressure grouting on the pile end.
Preferably, the outer wall of the core drilling guide pipe 7 is provided with a group of metal blocks 9A, the upper cover of the metal column 3 at the top end is provided with a steel plug 2A, the lower end of the steel plug 2A hooks the metal blocks 9A, and the nut 1 applies pressure on the steel plug 2A.
Another preferred, metal column 3 at the top is equipped with a set of spring buckle 9B all around, and 7 lateral walls of core drill pipe are equipped with a set of corresponding core drill pipe wall preformed hole 2B, nut 1 is applyed and is pressed on metal column 3 at the top, and makes spring buckle 9B inserts realize the locking in the core drill pipe wall preformed hole 2B.
As a further optimized scheme, two types of lock catches are designed in the specially-made grouting device, so that the grouting device and the core drilling guide pipe can be positioned and clamped in the high-pressure grouting process, and the deformation of the rubber column (namely the sealing of the pipe orifice of the core drilling guide pipe) is maintained. And the lock can be unlocked to recover the grouting pipe and the grouting device after grouting is finished. The pile end grouting of the quick and recyclable grouting device is realized.
The invention has the beneficial effects that:
1) after the pile is formed, the plug does not need to be opened regularly, and 24-hour continuous construction is not needed;
2) the influence of pile end grouting on the opened pile is avoided. Repeated clear water plugging is not needed on site to prevent the blockage of the grouting channel;
3) the recyclable grouting device can be recycled, so that the material consumption of a large number of pre-embedded grouting pipes and the grouting device is saved;
4) the grouting pipe pre-embedded in the pile head is not required to be protected, and the management difficulty of a construction site is obviously reduced;
5) the quick and recoverable slip casting ware turnover speed is fast, and it is convenient to use, can accelerate slip casting speed greatly, reduction of erection time.
Drawings
Fig. 1 is a schematic view of the conventional pile tip grouting principle.
Fig. 2 is a schematic view of a pile end grouting device of a quick and recyclable grouting device in the first embodiment.
Fig. 3 is a sectional view of fig. 2 taken along line 1-1 and line 2-2.
Fig. 4 is a schematic view of the pile-end grouting device of the quick and recoverable grouting device in the second embodiment.
Fig. 5 is a sectional view of fig. 4 taken along line 1-1 and line 2-2.
Fig. 6 is a schematic diagram of step one to step three of the pile end grouting process of the rapid and recyclable grouting device of the present invention.
Fig. 7 is a schematic diagram of steps four to five of the pile end grouting process of the rapid and retrievable grouter of the present invention.
In fig. 2-5, 1 is a nut, 2a is a steel plug, 2b is a preformed hole in the wall of the core-drilling conduit, 3 is a metal column, 4 is a rubber column, 5 is a metal plate, 6 is a fillet weld, 7 is a core-drilling conduit, 8 is a grouting pipe, 9a is a metal block, and 9b is a spring fastener;
in the figure 1, A is a cast-in-situ bored pile engineering pile, B is an embedded grouting pipe and a grouting device, and C is a grouting channel formed after high-pressure clear water is used for breaking concrete cement.
6-7, 100. boring a cast-in-place pile, 200. drilling a core through the bottom of the pile, 300. lowering a grouting pipe and a grouting device section by section, 400. screwing a nut, applying vertical pressure to the rubber column, causing it to expand laterally, thereby sealing the PVC pipe/core-drilling conduit; 500. loosening the nut, releasing the vertical pressure applied to the rubber column, contracting the rubber column, contacting and sealing, and taking out the grouting pipe and the grouting device from the PVC pipe/drill core guide pipe; 600. and lifting the grouting pipe and the grouting device out of the core drilling guide pipe.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Firstly, the overall process scheme is briefly described as follows: before pouring concrete of a pile body of a cast-in-situ bored pile, a bottom-sealing PVC rubber pipe or a core drilling pipe with the inner diameter larger than phi 130mm is pre-buried in the pile body to a position 0.5m away from the pile bottom. After the pile body is poured and the strength of the pile body reaches the design requirement, a drill bit of the coring drilling machine is placed into the pre-buried PVC rubber pipe or the drill core pipe and is drilled to a position 0.5m below the pile bottom. And then a grouting pipe and a special grouting device are put down to perform pile end grouting. And recovering the grouting pipe and the grouting device after grouting is finished.
The following process schemes of the present invention are described in detail as follows: referring to fig. 6-7, a fast and recyclable pile end grouting process of a grouter includes the following steps in sequence: a core drilling guide pipe 7 is embedded in a pile body of the engineering pile, and a set distance I is reserved between the bottom of the core drilling guide pipe 7 and the pile bottom; drilling downwards from the core drilling guide pipe 7 to the pile bottom by the set distance I by using a core drilling machine; the lower part of the grouting device is connected with a grouting pipe, and the grouting pipe is lowered along the drill core guide pipe 7, so that when the grouting device is in place, the bottom of the grouting pipe can exceed the pile bottom of the engineering pile by a set distance II; locking the top of the grouting device, and applying vertical pressure to the elastic sealing material to transversely expand the elastic sealing material so as to seal the core drilling conduit; grouting is carried out; and releasing the vertical pressure applied to the elastic sealing material, contracting the elastic sealing material, releasing the sealing, releasing the locking of the top of the grouting device, and recovering the grouting pipe and the grouting device.
Preferably, the set distance i is at least 0.5 m.
Preferably, the set distance II is 400-600 mm.
Preferably, the elastic sealing material is rubber.
The process changes the mode of forming a grouting channel by the traditional pile end grouting process, and the high-pressure water is used for jetting the concrete cement to form the grouting channel; after the concrete is hardened, drilling pile bottom concrete in the embedded PVC or core drilling pipe by using a core drilling machine to form a grouting channel; the operation steps of the traditional pile end grouting process are simplified, and the complicated process of repeated opening of the plug is omitted; and is not influenced by the time difference of pile foundation construction plug opening and grouting processes. Every stake slip casting passageway is opened promptly and is used, and adjacent pile foundation slip casting can not produce adverse effect to facing the stake, has greatly improved the slip casting success rate.
Secondly, the apparatus part of the present invention is described in detail as follows, and the apparatus part is divided into two embodiments:
the first embodiment is as follows:
the process flow is shown in fig. 6-7, and the device part is shown in fig. 2-3, and is implemented according to the following steps:
1. after the components are assembled and installed according to requirements, the pile foundation is drilled with a core and a hole is drilled until the depth of the hole is 0.5m below the pile bottom. And (5) lengthening the grouting pipes section by section, and stopping after lowering the grouting pipes to the bottom of the hole. And then a grouting device is installed, the nut 1 is screwed downwards to generate downward pressure, so that the rubber block 4 is expanded laterally, and the effect of sealing the drill core guide pipe is achieved.
2. After the sealing of the core drilling guide pipe is finished:
and aligning the vacant part of the steel plug 2A to the position of the metal block 9A, and twisting the steel plug 2A for 45 degrees until the steel plug is clamped and locked.
3. The grouting pipe 8 is connected with a grouting pump, grouting is started, and the grouting amount and the grouting pressure are stopped after meeting the design requirements.
4. After grouting is finished:
and twisting the steel plug 2A back to 45 degrees to enable the steel plug to be separated from the buckle of the metal block 9A.
5. And lifting and disassembling the grouting pipe section by section.
6. And after the grouting pipe is completely pulled out, filling the drill core guide pipe hole with cement slurry to seal the hole. And finally, pile end grouting is completed.
Example two:
the process flow is shown in fig. 6-7, and the apparatus part is shown in fig. 4-5, and is implemented according to the following steps:
1. after the components are assembled and installed according to requirements, the pile foundation is drilled with a core and a hole is drilled until the depth of the hole is 0.5m below the pile bottom. And (5) lengthening the grouting pipes section by section, and stopping after lowering the grouting pipes to the bottom of the hole. And then a grouting device is installed, the nut 1 is screwed downwards to generate downward pressure, so that the rubber block 4 is expanded laterally, and the effect of sealing the drill core guide pipe is achieved.
2. After the sealing of the core drilling guide pipe is finished:
the spring buckle 9B is clamped into the preformed hole 2B of the pipe wall of the core drilling conduit to be clamped and locked.
3. The grouting pipe 8 is connected with a grouting pump, grouting is started, and the grouting amount and the grouting pressure are stopped after meeting the design requirements.
4. After grouting is finished: the push-back spring buckle 9B is disengaged from the preformed hole 2B of the pipe wall of the core drill pipe.
5. And lifting and disassembling the grouting pipe section by section.
6. And after the grouting pipe is completely pulled out, filling the drill core guide pipe hole with cement slurry to seal the hole. And finally, pile end grouting is completed.
The above two embodiments are the preferred embodiments of the present invention, and those skilled in the art can make various changes or modifications based on the above embodiments without departing from the general concept of the present invention, and such changes or modifications should fall within the protection scope of the present invention.
Claims (7)
1. A pile end grouting process of a quick and recyclable grouting device is characterized by sequentially comprising the following steps:
a core drilling guide pipe (7) is pre-buried in a pile body of the engineering pile, and a set distance I is reserved between the bottom of the core drilling guide pipe (7) and the pile bottom;
drilling downwards the set distance I to the pile bottom from the core drilling guide pipe (7) by using a core drilling machine;
the lower part of the grouting device is connected with a grouting pipe, and the grouting pipe is placed down along the core drilling guide pipe (7), so that when the grouting device is in place, the bottom of the grouting pipe can exceed the pile bottom of the engineering pile by a set distance II;
locking the top of the grouting device, and applying vertical pressure to the elastic sealing material to transversely expand the elastic sealing material so as to seal the core drilling conduit;
grouting is carried out;
and releasing the vertical pressure applied to the elastic sealing material, contracting the elastic sealing material, releasing the sealing, releasing the locking of the top of the grouting device, and recovering the grouting pipe and the grouting device.
2. The pile end grouting process of a fast and recyclable grouting device as claimed in claim 1, characterized in that: the set distance i is at least 0.5 m.
3. The pile end grouting process of a fast and recyclable grouting device as claimed in claim 1, characterized in that: the set distance II is 400-600 mm.
4. The pile end grouting process of a fast and recyclable grouting device as claimed in claim 1, characterized in that: the elastic sealing material is rubber.
5. The utility model provides a quick and recoverable slip casting ware's stake end slip casting device which characterized in that:
a pile end grouting process for implementing the fast and recyclable grouting machine of claim 1;
comprises a core drilling guide pipe (7), a grouting pipe (8) and a rubber column (4);
a metal plate (5) with the outer diameter smaller than the inner diameter of the drill core guide pipe (7) is welded and fixed on the periphery of the grouting pipe (8); the plurality of rubber columns (4) are sleeved on the grouting pipe (8), and adjacent rubber columns (4) are separated by metal columns (3);
the upper part of the grouting pipe (8) is provided with a section of external thread, and the uppermost metal column (3) is vertically extruded by adopting a nut (1) matched with the external thread, so that the rubber column (4) radially expands to form sealing with the drill core guide pipe (7).
6. The pile end grouting device of a fast and retrievable grouting device according to claim 5, characterised in that: the outer wall of the drill core guide pipe (7) is provided with a group of metal blocks (9A), a steel plug (2A) is arranged on the upper cover of the metal column (3) at the top end, the lower end of the steel plug (2A) hooks the metal blocks (9A), and the nut (1) applies pressure on the steel plug (2A).
7. The pile end grouting device of a fast and retrievable grouting device according to claim 5, characterised in that: metal column (3) of the top is equipped with a set of spring buckle (9B) all around, and core drill pipe (7) lateral wall is equipped with a set of corresponding core drill pipe wall preformed hole (2B), nut (1) is exerted pressure on metal column (3) of the top, and makes spring buckle (9B) insert realize the locking in core drill pipe wall preformed hole (2B).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010228117.0A CN111424669A (en) | 2020-03-27 | 2020-03-27 | Pile end grouting process and device of quick and recyclable grouting device |
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| CN202010228117.0A CN111424669A (en) | 2020-03-27 | 2020-03-27 | Pile end grouting process and device of quick and recyclable grouting device |
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| CN111424669A true CN111424669A (en) | 2020-07-17 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112281824A (en) * | 2020-10-30 | 2021-01-29 | 黄淮学院 | Post-grouting construction method for pile bottom of post-inserted reinforcement cage of cast-in-place concrete pile |
| CN113818443A (en) * | 2021-10-26 | 2021-12-21 | 中国葛洲坝集团市政工程有限公司 | Grouting method after drilling of rock-entering underground diaphragm wall |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112281824A (en) * | 2020-10-30 | 2021-01-29 | 黄淮学院 | Post-grouting construction method for pile bottom of post-inserted reinforcement cage of cast-in-place concrete pile |
| CN113818443A (en) * | 2021-10-26 | 2021-12-21 | 中国葛洲坝集团市政工程有限公司 | Grouting method after drilling of rock-entering underground diaphragm wall |
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Application publication date: 20200717 |
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| RJ01 | Rejection of invention patent application after publication |