CN114703855A - Device for improving post-grouting quality of cast-in-place pile and construction method - Google Patents
Device for improving post-grouting quality of cast-in-place pile and construction method Download PDFInfo
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- CN114703855A CN114703855A CN202210138744.4A CN202210138744A CN114703855A CN 114703855 A CN114703855 A CN 114703855A CN 202210138744 A CN202210138744 A CN 202210138744A CN 114703855 A CN114703855 A CN 114703855A
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- grouting pipe
- pipe
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- 238000010276 construction Methods 0.000 title abstract description 21
- 230000002787 reinforcement Effects 0.000 claims abstract description 33
- 239000002689 soil Substances 0.000 claims abstract description 28
- 239000011440 grout Substances 0.000 claims abstract description 24
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 9
- 239000010959 steel Substances 0.000 claims abstract description 9
- 238000007569 slipcasting Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 10
- 239000004567 concrete Substances 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 7
- 239000007921 spray Substances 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 230000010412 perfusion Effects 0.000 claims 1
- 239000013049 sediment Substances 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 9
- 238000009435 building construction Methods 0.000 abstract description 3
- 238000003776 cleavage reaction Methods 0.000 description 3
- 238000011065 in-situ storage Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 230000007017 scission Effects 0.000 description 3
- 239000011378 shotcrete Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material 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
- 239000012466 permeate Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000003068 static effect 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
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
-
- 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
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (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 belongs to the technical field of building construction, and particularly relates to a device and a construction method for improving the post-grouting quality of a cast-in-place pile. The pile side grouting device comprises a steel reinforcement cage, a pile end grouting head, a pile side grouting head and a grouting pipe, wherein the grouting pipe comprises a first grouting pipe and a second grouting pipe, the first grouting pipe and the second grouting pipe are respectively connected with the pile end grouting head and the pile side grouting head, the first grouting pipe and the second grouting pipe are respectively fixed on the inner side and the outer side of the steel reinforcement cage, and grouting engineering can be simultaneously carried out on the ground and a side soil body through the matching of the pile end grouting head and the pile side grouting head. The pile end guniting head has the guniting and pressurizing effects, so that sediment and soil bodies near the pile end are compact, a 'bottom expanding' effect is generated, the end bearing capacity is improved, the pile side grout outlet can be bent and formed and is tightly attached to the side wall of the hole pile, grout can penetrate into soil bodies along the gap to fill the gap, the soil bodies are enabled to be consolidated, the soil body strength of a grouting area is improved, and the construction quality of post-grouting of a pile foundation and the bearing capacity of the pile foundation are improved.
Description
Technical Field
The invention belongs to the technical field of building construction, and particularly relates to a device and a construction method for improving the post-grouting quality of a cast-in-place pile.
Background
In the construction of buildings in China, a pile foundation is used as a structural form applied to the building foundation, the sediment at the bottom of a hole cannot be guaranteed to be removed by 100% to meet the design requirement no matter the current construction process of the cast-in-situ bored pile is a forward circulation method or a reverse circulation method, and the requirement cannot be met even if the hole is cleaned for the second time can be obtained from the results of the sediment thickness tester test and the static load detection.
Because the sediment at the bottom of the pile is thick, the bearing force at the pile end can not be fully exerted, which is particularly obvious for the pile with the pile end entering a compact sand layer. Therefore, how to solve the above problems and improve the vertical load capacity of the cast-in-situ bored pile becomes a practical problem to be solved in the engineering.
In the prior art, post grouting of a cast-in-situ bored pile basically belongs to the combination of split grouting and infiltration grouting. The so-called cleavage grouting is that high-pressure slurry of sub-shavings overcomes the initial pressure stress on the main stress surface of the soil body to cause cleavage damage to the soil body, the slurry permeates into soil body filling gaps along cleavage gaps and compacts pile side soil to promote the consolidation of the soil body so as to improve the soil body strength of a grouting area. If the grouting area is at the bottom of the pile, the grout is firstly split and permeated in the sediment area at the bottom of the pile, so that sediment and soil bodies near the end of the pile are compact, a bottom expanding effect is generated, the end bearing capacity is improved, and if the grouting area is at a certain part on the side of the pile, the diameter expanding effect is also generated at the certain part. The material is found out from the actual measurement of a large number of test piles, the end bearing capacity of the pile is improved after the pile bottom is grouted, and the side frictional resistance of the pile within the range of 5m above the end and even more is also greatly improved. If grouting is carried out on a certain section of the pile side, the friction resistance of the pile side within a certain range above the section is also obviously improved.
However, in the prior art, the grouting failure caused by the blockage of the grout outlet is easy to occur; pile side slip casting pipe ligature is in the steel reinforcement cage outside, often pours slip casting pipe and whitewashing head in concrete in the concrete placement construction, and the condition of jam appears very easily in the slip casting pipe.
Disclosure of Invention
In order to solve the technical problems, the invention belongs to the technical field of building construction, and particularly relates to a device for improving the post-grouting quality of a cast-in-place pile and a construction method.
The technical scheme adopted by the invention is as follows: the utility model provides a device of grouting quality behind improvement bored concrete pile, includes pile tip whitewashing head, stake side whitewashing head, steel reinforcement cage and slip casting pipe, its characterized in that: the grouting pipes comprise a first grouting pipe and a second grouting pipe, the first grouting pipe and the second grouting pipe are respectively arranged on the inner side and the outer side of the reinforcement cage, the first grouting pipe is connected with the pile end guniting head, and the second grouting pipe is connected with the pile side guniting head;
the pile end guniting head and the pile side guniting head can simultaneously spray grouting on soil bodies at the bottom of the reinforcement cage and on the side edge of the reinforcement cage.
Furthermore, the pile end guniting head is provided with a conical nozzle, the surface of the conical nozzle is provided with a plurality of grout outlets, and the conical nozzle is matched with the grout outlets to rapidly spray grouting grout and increase the spraying area of the grouting grout.
Furthermore, the pile side guniting head is provided with a flexible nozzle, and the flexible nozzle can adjust the grouting injection direction.
Furthermore, the grouting pipe is provided with a connecting sleeve, and the connecting sleeve can connect the first grouting pipe and the second grouting pipe with the pile end guniting head and the pile side guniting head respectively.
Further, the pile side guniting head is provided with a fixing device, and the fixing device can be connected with the second grouting pipe and fixes the pile side guniting head.
Furthermore, the pile end guniting head is provided with a plugging plate, and the plugging plate is arranged on the outer side of the conical nozzle and can adjust the opening and closing of the conical nozzle.
Further, the flexible nozzle is provided with a protective plug which can prevent the grouting from flowing back.
Further, the grouting pipe is provided with a fastener, and the fastener can fasten the grouting pipe on the reinforcement cage.
Further, a construction method of the device for improving the post-grouting quality of the cast-in-place pile is characterized by comprising the following steps:
placing the first grouting pipe on the inner side of the reinforcement cage, and placing the second grouting pipe on the outer side of the reinforcement cage;
the pile end guniting head is arranged at one end, close to the ground, of the first grouting pipe;
the pile side guniting head is installed at one end, close to the ground, of the second grouting pipe;
and the pile end guniting head and the pile side guniting head simultaneously carry out grouting and guniting on the ground and the side soil body to finish grouting.
The invention has the advantages and positive effects that: by adopting the technical scheme, the pile end guniting head adopts a conical structure, has guniting pressurization effect, and the grout is firstly split and permeated in a sediment zone at the bottom of the pile, so that sediment and soil bodies near the pile end are compact, a bottom expanding effect is generated, the end bearing capacity is improved, the problem that a grouting pipe is blocked by concrete is solved, and the construction quality of post-grouting of a pile foundation is improved.
The pile side grout outlet can be bent and formed by adopting the flexible high-pressure grout spraying port, the side wall of the hole pile can be tightly attached to the steel reinforcement cage when the steel reinforcement cage is placed, the grout can penetrate into a soil body along a gap to fill a gap, and pile side soil is compacted, so that the soil body is solidified, the soil body strength of a grouting area is improved, the construction quality of grouting after a pile foundation is improved, and the bearing capacity of the pile foundation is improved.
Drawings
FIG. 1 is a schematic view of a construction structure according to an embodiment of the present invention;
FIG. 2 is a schematic view of a grout tube according to an embodiment of the present invention;
FIG. 3 is a schematic view of a conical spray head according to an embodiment of the invention;
FIG. 4 is a schematic view of a flexible nozzle tip according to an embodiment of the present invention
In the figure:
1. reinforcing cage 2, pile end guniting head 3 and conical nozzle
4. Pile side guniting head 5, flexible nozzle 6 and sealing plug
7. Fixing device 8, slip casting pipe 9, first slip casting pipe
10. Second slip casting pipe 11, connecting sleeve 12 and fastener
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. In addition, in the following description, descriptions of techniques for well-known structures are omitted so as to avoid unnecessarily obscuring the concepts of the present invention.
Embodiments of the present invention will be described below with reference to the accompanying drawings.
A device for improving the post-grouting quality of a cast-in-place pile and a construction method thereof comprise a reinforcement cage 1, a pile end grouting head 2, a conical nozzle 3, a pile side grouting head 4, a flexible nozzle 5, a sealing plug 6, a fixing device 7, a grouting pipe 8, a first grouting pipe 9, a second grouting pipe 10, a connecting sleeve 11 and a fastener.
As shown in fig. 1, in the embodiment of the present invention, a grouting pipe 8 is installed in a reinforcement cage 1, wherein the grouting pipe 8 is divided into a first grouting pipe 9 and a second grouting pipe 10, the first grouting pipe 9 is oppositely disposed at the inner side of the reinforcement cage 1, and the first grouting pipe 9 is fixed on the reinforcement cage 1 through a fastener 12; the second grouting pipe 10 is arranged on the outer side of the reinforcement cage 1, and the second grouting pipe 10 is fixed on the reinforcement cage 1 through a fastener 12; pile end grouting head 2 and pile side grouting head 4 are installed respectively to the one end that is close to ground at first slip casting pipe 9 and second slip casting pipe 10, and the grout is spouted from pile end shotcrete head 2 and pile side shotcrete head 4 through first slip casting pipe 9 and second slip casting pipe 10, realizes pouring simultaneously ground and side soil body, has improved the efficiency of construction, makes the slip casting process more convenient and the slip casting effect obtains showing and promotes.
Preferably, as shown in fig. 2, the grouting pipes 8 can be connected through connecting sleeves 11, so that the grouting pipes 8 can adapt to reinforcement cages 1 with different lengths, and the injection engineering of cast-in-place piles with different depths can be adapted through the matching connection between the connecting sleeves 11 and the grouting pipes 8
Preferably, as shown in fig. 3, the pile end grouting head 2 is connected with the first grouting pipe 9 through a connecting sleeve 11, the conical nozzle 3 is installed at the pile end grouting head 2, the surface of the conical nozzle 3 is provided with a plurality of grout outlets, the conical nozzle 3 can rapidly spray grouting grout and increase the spraying area of grouting grout by matching with the grout outlets, the construction efficiency of grouting on the ground is improved, and the coverage area is wide; the conical nozzle 3 is provided with the plugging plate, the plugging plate can close or open the conical nozzle 3 through opening and closing, and the plugging plate can prevent the blockage of the grouting pipe 8 caused by the backflow of slurry in the process of lowering the reinforcement cage 1, so that protective measures are provided for smooth construction and repeated use of the embodiment of the invention.
Preferably, as shown in fig. 4, the pile side guniting head 4 is also connected with a second grouting pipe 10 through a connecting sleeve 11, a flexible nozzle 5 is installed on the pile side guniting head 4, the nozzle direction of the flexible nozzle 5 can be adjusted, grouting is carried out towards a place needing construction, a sealing plug 6 is arranged at a nozzle of the flexible nozzle 5, the sealing plug 6 can prevent slurry from flowing back to cause blockage of the grouting pipe 8 in the lowering process of the reinforcement cage 1, and the sealing plug 6 can be pulled out of the nozzle in a pulling line mode after being lowered to a preset position. Protective measures are provided for smooth construction and repeated use of the embodiment of the invention; the pile side grouting head 4 is also provided with a fixing device 7, the fixing device 7 is connected with the fixing ring through a buckle to enable the flexible nozzle 5 to be fixed after being adjusted to a specified direction, so that the flexible nozzle 5 cannot be taken away from the specified direction along with a large amount of grouting injection processes, and the grouting efficiency of a soil body on the side is improved.
Example 1:
when the reinforcement cage 1 is manufactured, the first grouting pipe 9 and the second grouting pipe 10 are installed together, and the first grouting pipe 9 and the second grouting pipe 10 are respectively fixed on the inner side and the outer side of the reinforcement cage 1 through fasteners 12; a pile end guniting head 2 is arranged at one end of the first grouting pipe 9 close to the ground through a connecting sleeve 11, and a pile side guniting head 4 is arranged at one end of the second grouting pipe 10 close to the ground through the connecting sleeve 11; simultaneously, a conical nozzle 3 and a flexible nozzle 5 are respectively arranged on the pile end guniting head 2 and the pile side guniting head 4, the grouting direction of the flexible nozzle 5 is adjusted, a sealing plug is arranged at the nozzle of the flexible nozzle 5, the grouting direction of the flexible nozzle 5 is fixed through a fixing device, and a plugging plate is arranged on the outer side of the conical nozzle 3.
And (5) after the installation, lowering the reinforcement cage 1. After the pile foundation concrete is poured, the grouting operation is suitable for starting two days after the pile is formed, and is not suitable for exceeding 30 days after the pile is formed. The compound grouting sequence is that the pile side is firstly followed by the pile end, and the grouting interval of the pile end at the pile side is not less than 2 hours.
The embodiment of the invention has the advantages that: the pile end guniting head adopts a conical structure, has a guniting pressurization effect, and grout is firstly split and permeated in a sediment area at the bottom of a pile, so that sediment and soil bodies near the pile end are compact, a bottom expanding effect is generated, the end bearing capacity is improved, the problem that a grouting pipe is blocked by concrete is solved, and the construction quality of grouting after a pile foundation is improved.
The pile side grout outlet can be bent and formed by adopting the flexible high-pressure grout spraying port, the side wall of the hole pile can be tightly attached to the steel reinforcement cage when the steel reinforcement cage is placed, the grout can penetrate into a soil body along a gap to fill a gap, and pile side soil is compacted, so that the soil body is solidified, the soil body strength of a grouting area is improved, the construction quality of grouting after a pile foundation is improved, and the bearing capacity of the pile foundation is improved.
The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (9)
1. The utility model provides a device of grouting quality behind improvement bored concrete pile, includes steel reinforcement cage, stake end whitewashing head, stake side whitewashing head and slip casting pipe, its characterized in that: the grouting pipes comprise a first grouting pipe and a second grouting pipe, the first grouting pipe and the second grouting pipe are respectively arranged on the inner side and the outer side of the reinforcement cage, the first grouting pipe is connected with the pile end guniting head, and the second grouting pipe is connected with the pile side guniting head;
the pile end guniting head and the pile side guniting head can simultaneously spray grouting on soil bodies at the bottom of the reinforcement cage and on the side edge of the reinforcement cage.
2. The device for improving the post-grouting quality of the cast-in-place pile according to claim 1, characterized in that: the pile end grouting head is provided with a conical nozzle, the surface of the conical nozzle is provided with a plurality of grout outlets, and the conical nozzle can be matched with the grout outlets to quickly spray grouting and increase the spraying area of the grouting.
3. The device for improving the post-grouting quality of the cast-in-place pile according to claim 1, characterized in that: the pile side guniting head is provided with a flexible nozzle, and the flexible nozzle can adjust the grouting injection direction.
4. The device for improving the post-grouting quality of the cast-in-place pile according to claim 1, characterized in that: the grouting pipe is provided with a connecting sleeve, and the first grouting pipe and the second grouting pipe can be connected with the pile end guniting head and the pile side guniting head respectively through the connecting sleeve.
5. The device for improving the post-grouting quality of the cast-in-place pile according to claim 1, characterized in that: the pile side guniting head is provided with a fixing device, and the fixing device can be connected with the second grouting pipe and fixes the pile side guniting head.
6. The device for improving the post-grouting quality of the cast-in-place pile according to claim 2, characterized in that: the pile end guniting head is provided with a plugging plate, and the plugging plate is arranged on the outer side of the conical nozzle and can adjust the opening and closing of the conical nozzle.
7. The apparatus for improving the post-grouting quality of a cast-in-place pile according to claim 3, wherein: the flexible nozzle is provided with a sealing plug which can prevent the backflow of the perfusion slurry.
8. The device for improving the post-grouting quality of the cast-in-place pile according to claim 4, characterized in that: the grouting pipe is provided with a fastener, and the fastener can fasten the grouting pipe on the reinforcement cage.
9. A method of constructing an apparatus for improving post-grouted pile grouting quality according to claim 1, wherein the method comprises the steps of:
placing the first grouting pipe on the inner side of the reinforcement cage, and placing the second grouting pipe on the outer side of the reinforcement cage;
the pile end guniting head is installed at one end, close to the ground, of the first grouting pipe;
the pile side guniting head is installed at one end, close to the ground, of the second grouting pipe;
and the pile end guniting head and the pile side guniting head simultaneously carry out grouting and guniting on the ground and the side soil body to finish grouting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210138744.4A CN114703855A (en) | 2022-02-15 | 2022-02-15 | Device for improving post-grouting quality of cast-in-place pile and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210138744.4A CN114703855A (en) | 2022-02-15 | 2022-02-15 | Device for improving post-grouting quality of cast-in-place pile and construction method |
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| Publication Number | Publication Date |
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| CN114703855A true CN114703855A (en) | 2022-07-05 |
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| CN202210138744.4A Pending CN114703855A (en) | 2022-02-15 | 2022-02-15 | Device for improving post-grouting quality of cast-in-place pile and construction method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006307593A (en) * | 2005-05-02 | 2006-11-09 | Taisei Corp | Grout pipe and grouting in cast-in-place concrete pile |
| CN101509352A (en) * | 2009-03-11 | 2009-08-19 | 西南石油大学 | Drill with flexible nozzle |
| CN104452746A (en) * | 2013-09-23 | 2015-03-25 | 中国建筑股份有限公司上海分公司 | Construction method for bored pile |
| CN214657036U (en) * | 2021-02-23 | 2021-11-09 | 赵鹏举 | High-pressure injection grouting spray head |
| CN217174793U (en) * | 2022-02-15 | 2022-08-12 | 中冶天工集团有限公司 | Device for improving post-grouting quality of cast-in-place pile |
-
2022
- 2022-02-15 CN CN202210138744.4A patent/CN114703855A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006307593A (en) * | 2005-05-02 | 2006-11-09 | Taisei Corp | Grout pipe and grouting in cast-in-place concrete pile |
| CN101509352A (en) * | 2009-03-11 | 2009-08-19 | 西南石油大学 | Drill with flexible nozzle |
| CN104452746A (en) * | 2013-09-23 | 2015-03-25 | 中国建筑股份有限公司上海分公司 | Construction method for bored pile |
| CN214657036U (en) * | 2021-02-23 | 2021-11-09 | 赵鹏举 | High-pressure injection grouting spray head |
| CN217174793U (en) * | 2022-02-15 | 2022-08-12 | 中冶天工集团有限公司 | Device for improving post-grouting quality of cast-in-place pile |
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