CN113882384B - Grouting pipe construction method for post-grouting of cast-in-place pile - Google Patents
Grouting pipe construction method for post-grouting of cast-in-place pile Download PDFInfo
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- CN113882384B CN113882384B CN202111309637.5A CN202111309637A CN113882384B CN 113882384 B CN113882384 B CN 113882384B CN 202111309637 A CN202111309637 A CN 202111309637A CN 113882384 B CN113882384 B CN 113882384B
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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
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
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- Piles And Underground Anchors (AREA)
Abstract
The application discloses a grouting pipe construction method for post-grouting of a cast-in-place pile, which comprises the following steps: manufacturing a pile side grouting hose, and forming a side grout outlet at a preset position of the manufactured pile side grouting hose; installing a plurality of pile side grouting hoses on the pile side along the outer peripheral side of the reinforcement cage in a surrounding manner, so that one side of each pile side grouting hose, which is provided with a side grout outlet, is far away from the reinforcement cage and protrudes, and an outer convex part and an inner concave part are formed on the outer side and the inner side of each pile side grouting hose; installing a plurality of pile side grouting pipes at preset positions of the reinforcement cage, and communicating bottom grout outlet holes of the pile side grouting pipes with pipe bodies of pile side grouting hoses; installing a pile bottom grouting pipe at the bottom of the reinforcement cage, so that the bottom of the pile bottom grouting pipe extends out of the bottom of the reinforcement cage by a preset length; and respectively connecting the pile side grouting pipe and the pile bottom grouting pipe with a grouting device. The condition that the grout outlet of slip casting pipe was wrapped up by the concrete completely can be avoided to this application for follow-up slip casting is in unobstructed state, improves the construction quality of pile foundation.
Description
Technical Field
The invention relates to the field of post-grouting of a cast-in-place pile, in particular to a construction method of a grouting pipe for post-grouting of a cast-in-place pile.
Background
The pile foundation is an important supporting structure in building engineering, for example, in the construction process of some viaducts, in order to improve the bearing capacity of a pile body, the pile foundation generally adopts a mode of drilling a cast-in-place pile and pre-embedding a grouting pipe for post-grouting.
At present, the traditional post-grouting construction method generally needs to install grouting pipes at preset positions of the pile side and the pile bottom, when the conventional pile side grouting pipe is installed, a grouting steel wire hose is generally connected through a tee joint and winds around a reinforcement cage for a circle, so that the grouting steel wire hose is tightly bound to the reinforcement cage, and when the conventional pile bottom grouting pipe is installed, the bottom of the grouting pipe is generally flush with the bottom of the reinforcement cage.
Aiming at the prior relevant technology, the inventor finds that when the pile foundation is in the process of pouring concrete, the grout outlet at the bottom of the pile bottom grouting pipe and the grout outlet at the pile side grouting pipe are easily and completely wrapped by the pile body concrete, if the pile foundation is not plugged in time, the subsequent grouting pressure is too large, even the grout outlet cannot be opened, the designed grouting amount cannot be reached, the improvement of the bearing capacity of the pile foundation is directly influenced, and the improvement is needed.
Disclosure of Invention
The utility model provides an aim at provides a slip casting pipe construction method of slip casting behind bored concrete pile, can avoid the grout outlet of slip casting pipe by the condition that the concrete wraps up completely for follow-up slip casting is in unobstructed state, improves the construction quality of pile foundation.
The application provides a slip casting pipe construction method of bored concrete pile post-grouting, adopts following technical scheme:
a construction method of a grouting pipe for post-grouting of a cast-in-place pile comprises the following steps:
the method comprises the following steps: manufacturing a pile side grouting hose, and forming a side grout outlet at a preset position of the manufactured pile side grouting hose;
step two: installing a plurality of pile side grouting hoses on the pile side along the periphery of the reinforcement cage in a surrounding manner, so that one side of each pile side grouting hose, which is provided with a side grout outlet, is far away from the reinforcement cage and protrudes, and an outer convex part is formed on the outer side of each pile side grouting hose and an inner concave part is formed on the inner side of each pile side grouting hose;
step three: installing a plurality of pile side grouting pipes at preset positions of the reinforcement cage, and communicating bottom grout outlet holes of the pile side grouting pipes with pipe bodies of pile side grouting hoses;
step four: installing a pile bottom grouting pipe at the bottom of the reinforcement cage, so that the bottom of the pile bottom grouting pipe extends out of the bottom of the reinforcement cage by a preset length;
step five: and respectively connecting the pile side grouting pipe and the pile bottom grouting pipe with a grouting device.
Through adopting above-mentioned technical scheme, encircle stake side slip casting hose at steel reinforcement cage periphery side, itself can be so that the slip casting is more even, preset position with stake side slip casting hose sets to outside protrusion and inside sunken, and extend the predetermined length in steel reinforcement cage bottom with the bottom of stake end slip casting pipe, can increase the grouting space in grout outlet, the side grout outlet of having avoided stake side slip casting hose and the grout outlet of stake end slip casting socle portion are wrapped up by the concrete, thereby can guarantee the smooth and easy going on of slip casting, the effectual construction quality who improves the pile foundation.
The application further provides that the pile side grouting hoses are uniformly distributed on the outer side of the reinforcement cage at intervals along the extending direction of the reinforcement cage.
Through adopting above-mentioned technical scheme, restriction stake side slip casting hose's position makes its evenly distributed in the preset position of steel reinforcement cage, can be so that the comparatively even distribution of slip casting in the steel reinforcement cage outside, both can guarantee construction quality, can also save operating time simultaneously.
The method is further provided with at least three outer convex parts in the second step, and the connecting position of the pile side grouting pipe and the pile side grouting hose is located between the adjacent outer convex parts.
Through adopting above-mentioned technical scheme, the homogeneity that the slip casting distributes can be guaranteed in the setting of a plurality of convex parts, and the tip position of restriction stake side slip casting pipe, then can be so that the even entering stake side slip casting hose of grout that stake side slip casting pipe came out, further improve the construction quality of pile foundation.
The application further provides that the lateral grout outlet is arranged on one side of the outer convex part, which is far away from the inner concave part.
Through adopting above-mentioned technical scheme, the setting of convex part can increase the play thick liquid scope in side play thick liquid hole, simultaneously, can also reduce the condition by concrete parcel.
The application is further provided with that the pile side grouting pipe is connected with the pile side grouting hose through a three-way pipe.
Through adopting above-mentioned technical scheme, the setting of three-way pipe has certain guide effect to the grout transport in the stake side slip casting pipe for the even output to both sides of grout, simultaneously, can also strengthen the joint strength between stake side slip casting pipe and the stake side slip casting hose, reduce wearing and tearing between the two.
The application further provides that the bottom opening of the pile bottom grouting pipe is arranged to be flared outwards.
Through adopting above-mentioned technical scheme, the scope of stake end slip casting socle discharge grout can be increased to the opening of loudspeaker form, has improved the efficiency of construction, simultaneously, still is unfavorable for the parcel of concrete to stake end slip casting socle portion.
The method is further provided with that the length of the reinforcement cage extending out of the bottom of the pile bottom grouting pipe is 14-16 cm, and when the depth of the formed hole is larger than the designed hole depth, the length of the bottom of the pile bottom grouting pipe is larger than 16 cm.
Through adopting above-mentioned technical scheme, set up the extension length of pile head slip casting socle portion according to actual conditions, can effectively reduce pile foundation pouring in-process, the condition that pile head slip casting socle portion is wrapped up by the concrete.
The pile side grouting pipe is arranged on the outer side of the steel reinforcement cage, the pile bottom grouting pipe is arranged on the inner side of the steel reinforcement cage, and the pile side grouting pipe, the pile bottom grouting pipe and the steel reinforcement cage are fixed through reinforcing ribs.
Through adopting above-mentioned technical scheme, restriction pile side slip casting pipe and pile end slip casting pipe's position can avoid both mutual interference, and the setting of strengthening rib then can strengthen the installation fastness of pile side slip casting pipe and pile end slip casting pipe.
In summary, the present application includes at least one of the following beneficial technical effects:
through set up outer convex part and interior concave part on the pipe shaft at stake side slip casting hose, and simultaneously, the hole setting that goes out the side is on outer convex part, can increase the slip casting space in hole that goes out the side, thereby can reduce the circumstances that stake foundation concrete offside hole wrapped up, and extend the predetermined length in steel reinforcement cage bottom with stake end slip casting socle portion, can reduce the circumstances that stake foundation concrete wrapped up in stake end slip casting socle portion hole equally, adopt this scheme, can guarantee smooth and easy going on of slip casting, effectual improvement construction quality.
Drawings
FIG. 1 is a schematic view of the installation position of a pile side grouting pipe and a pile side grouting hose in the embodiment of the application;
FIG. 2 is a schematic view of the installation position of a pile bottom grouting pipe in the embodiment of the application;
fig. 3 is a schematic structural diagram of a fixing assembly in an embodiment of the present application.
Description of reference numerals: 1. a reinforcement cage; 2. grouting a hose at the pile side; 20. a lateral slurry outlet hole; 21. an outer convex portion; 22. an inner concave portion; 3. pile side grouting pipes; 4. pile bottom grouting pipes; 5. an annular strip; 50. an arc-shaped notch; 51. a support frame; 52. a base plate; 6. a fixing rod; 61. mounting a plate; 62. an arc-shaped splint; 63. a bolt; 64. a limiting ring; 7. a vertical bar; 71. an arc-shaped scraper.
Detailed Description
The present application is described in further detail below with reference to the accompanying drawings.
The embodiment of the application discloses a grouting pipe construction method for post-grouting of a cast-in-place pile, as shown in fig. 1 and 2, comprising the following steps:
the method comprises the following steps: manufacturing a pile side grouting hose 2, selecting a plurality of preset positions on a pipe body of the manufactured pile side grouting hose 2, and then forming a plurality of side grout outlet holes 20 at the preset positions;
step two: a plurality of pile side grouting hoses 2 are arranged on the pile side along the periphery of the reinforcement cage 1 in a surrounding mode, the pile side grouting hoses 2 can be bound on the reinforcement cage 1 through strapping tapes, and it is noted that one side, provided with a side grout outlet hole 20, of each pile side grouting hose 2 is arranged to protrude away from the reinforcement cage 1, so that an outer convex portion 21 is formed on the outer side of each pile side grouting hose 2, and an inner concave portion 22 is formed on the inner side of each pile side grouting hose 2;
step three: a plurality of pile side grouting pipes 3 are arranged at preset positions of the reinforcement cage 1, the pile side grouting pipes 3 are vertically arranged, and then a bottom grout outlet of each pile side grouting pipe 3 is communicated with a pipe body of the pile side grouting hose 2;
step four: vertically installing a pile bottom grouting pipe 4 at the bottom of the reinforcement cage 1, and then extending the bottom of the pile bottom grouting pipe 4 out of the bottom of the reinforcement cage 1 by a preset length;
step five: the pile side grouting pipe 3 and the pile bottom grouting pipe 4 are respectively connected with a grouting press.
In the embodiment, the diameter of the pile is 1.2 meters, the length of the pile is approximately 27-38.5 meters, the supporting layer at the bottom of the pile is dense medium sand, the depth of the pile bottom entering the supporting layer is not less than 1.5 meters, and the post-grouting condition is considered to be good, so that the post-grouting is adopted, the grouting length is 20 meters, the allowable bearing capacity of a single pile is 7200-9100 KN, and two pile bottom grouting valves are provided.
Wherein, stake side slip casting hose 2 is in the outside of steel reinforcement cage 1 along the even interval distribution of extending direction of steel reinforcement cage 1, because the long requirement of stake, stake side slip casting hose 2 quantity is two in this embodiment, such setting, can so that the comparatively even distribution of slip casting in the outside of steel reinforcement cage 1, both can guarantee construction quality, can also save operating time simultaneously.
It should be noted that at least three outer convex portions 21 are provided in step two, and four outer convex portions are provided in this embodiment, so that the outer convex portions 21 can be uniformly distributed in four directions, and the joint of the pile side grouting pipe 3 and the pile side grouting hose 2 is located between the adjacent outer convex portions 21, so that cement paste coming out of the pile side grouting pipe 3 can uniformly enter the pile side grouting hose 2, and it should be noted that the pile side grouting pipe 3 in this embodiment may be made of a stainless steel material, or may be made of a hard plastic material.
In order to make even the carrying to both sides of grout of stake side slip casting pipe 3, be connected through the three-way pipe between stake side slip casting pipe 3 and the stake side slip casting hose 2, the three-way pipe is except making things convenient for 3 transport cement thick liquid of stake side slip casting pipe, can also strengthen the joint strength between stake side slip casting pipe 3 and the stake side slip casting hose 2, in addition, in order to increase the play thick liquid scope in side grout outlet 20, reduce the condition that the grout outlet of side grout outlet 20 is wrapped up by the concrete, set up the one side that interior recess 22 was kept away from to side grout outlet 20 in this embodiment outside convex part 21.
Wherein, the bottom opening of the pile bottom grouting pipe 4 is set to the outwards-opened trumpet-shaped, the opening of the pile bottom grouting pipe 4 trumpet-shaped can increase the range of the cement slurry discharged from the pile bottom grouting pipe 4, the construction efficiency is improved, and meanwhile, due to the increase of the space, the concrete which is not favorable for the pile foundation wraps the bottom of the pile bottom grouting pipe 4, so that grouting can be guaranteed to be performed smoothly.
In this embodiment, the length of the bottom of the pile bottom grouting pipe 4 extending out of the reinforcement cage 1 is 14-16 cm, preferably 15 cm, when the depth of the formed hole is greater than the designed depth of the hole, the extension length of the bottom of the pile bottom grouting pipe 4 needs to be correspondingly increased, and the extension length of the bottom of the pile bottom grouting pipe 4 should be greater than 16 cm, so as to ensure that the grout outlet of the pile bottom grouting pipe 4 is not covered by concrete after the completion of pile foundation grouting.
In addition, the setting of stake side slip casting pipe 3 in this embodiment is in the outside of steel reinforcement cage 1, and quantity is two, and stake end slip casting pipe 4 sets up in steel reinforcement cage 1 inboardly, and quantity also is two, just so can avoid both mutual interference, all welds between stake side slip casting pipe 3 and stake end slip casting pipe 4 and steel reinforcement cage 1 and has the strengthening rib, and the setting of strengthening rib then can strengthen the installation fastness of stake side slip casting pipe 3 and stake end slip casting pipe 4.
In this embodiment, as shown in fig. 2 and 3, in order to facilitate the installation and removal of the pile bottom grouting pipe 4, an annular strip 5 is disposed on the ground near the periphery of the pile hole, the outline of the annular strip 5 is substantially the same as the outline of the pile hole, at least three support frames 51 are hinged outside the annular strip 5, one end of each support frame 51 far from the annular strip 5 is hinged with a backing plate 52, a plurality of mounting holes for mounting screws are formed in the backing plate 52, and a plurality of fixing components for fixing the pile bottom grouting pipe 4 are disposed on the periphery of the annular strip 5.
Wherein, fixed subassembly includes: threaded connection is at a plurality of dead levers 6 on annular strip 5, and the quantity of dead lever 6 is unanimous with the quantity of pile bottom slip casting pipe 4, and 6 one end of dead lever is worn out from the outside of annular strip 5, and 6 other ends of dead lever are fixed with mounting panel 61, and it has two symmetrical arc splint 62 to articulate on mounting panel 61, and arc splint 62 and pile bottom slip casting pipe 4 outline looks adaptation, and the detachable connection of bolt 63 is passed through to one side that mounting panel 61 was kept away from to two arc splint 62.
When pile bottom grouting pipe 4 needs to be installed, annular strip 5 can be placed on the ground on the periphery of a pile hole, support frame 51 is rotated, preset position on the ground is attached to backing plate 52, backing plate 52 is fixed by screws, annular strip 5 is fixed, pile bottom grouting pipe 4 vertically penetrates through two arc-shaped clamping plates 62 until the bottom of pile bottom grouting pipe 4 descends to the preset position of the bottom of the pile hole, and at the moment, two arc-shaped clamping plates 62 are locked by bolts, so that pile bottom grouting pipe 4 is firmly fixed on annular strip 5.
Wherein, arc notch 50 has been seted up along its extending direction on annular strip 5, arc notch 50 can be followed to the outer tip of dead lever 6 and passed, and threaded connection has two spacing rings 64 on dead lever 6, when the position change of slip casting pipe 4 at the bottom of the stake, spacing ring 64 to the restriction of dead lever 6 of removing that can be very convenient, make dead lever 6 both can slide along arc notch 50, can adjust the dead lever 6 elongation for annular strip 5 again, further increase the application scope of this application, treat the position of adjusting dead lever 6, rotatory spacing ring 64, locking dead lever 6 can.
In addition, the outside can be stained with grout when considering that pile bolck pipe 4 takes out from the stake downthehole, in this embodiment, still install vertical retort 7 on dead lever 6, it has two arc scraper blades 71 to articulate in the one end of dead lever 6 to keep away from at vertical retort 7, and the one end that is close to vertical retort 7 at arc scraper blade 71 installs the piece that resets, the piece that resets of this embodiment can be torsional spring or reset spring, when pile bolck pipe 4 up extracts, two arc scraper blades 71 that set up can be close to each other under the effect of the piece that resets, and scrape the grout outside pile bolck pipe 4, the grout of the outside adhesion of pile bolck pipe 4 can very convenient cleaing away, both can clean pile bolck pipe 4, can reduce the waste of grout again.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (6)
1. A construction method of a grouting pipe for post-grouting of a cast-in-place pile is characterized by comprising the following steps:
the method comprises the following steps: manufacturing a pile side grouting hose (2), and forming a side grout outlet (20) at a preset position of the manufactured pile side grouting hose (2);
step two: installing a plurality of pile side grouting hoses (2) on the pile side along the outer peripheral side of the steel reinforcement cage (1) in a surrounding mode, enabling one side, provided with a side grout outlet (20), of each pile side grouting hose (2) to be far away from the steel reinforcement cage (1) in a protruding mode, and forming an outer convex portion (21) on the outer side of each pile side grouting hose (2) and an inner concave portion (22) on the inner side of each pile side grouting hose;
step three: a plurality of pile side grouting pipes (3) are arranged at preset positions of the reinforcement cage (1), and a bottom grout outlet of each pile side grouting pipe (3) is communicated with a pipe body of each pile side grouting hose (2);
step four: a pile bottom grouting pipe (4) is arranged at the bottom of the reinforcement cage (1), so that the bottom of the pile bottom grouting pipe (4) extends out of the bottom of the reinforcement cage (1) by a preset length;
step five: connecting the pile side grouting pipe (3) and the pile bottom grouting pipe (4) with a grouting press respectively;
the pile foundation grouting pipe is characterized in that an annular strip (5) is arranged on the ground and close to the periphery of a pile hole, the outline of the annular strip (5) is approximately the same as the outline of the pile hole, at least three support frames (51) are hinged to the outer side of the annular strip (5), one ends, far away from the annular strip (5), of the support frames (51) are hinged to base plates (52), a plurality of mounting holes for mounting screws are formed in the base plates (52), and a plurality of fixing assemblies for fixing the pile foundation grouting pipe 4 are arranged on the periphery of the annular strip (5);
wherein, fixed subassembly includes: the pile bottom grouting pipe fixing device comprises a plurality of fixing rods (6) in threaded connection with an annular strip (5), wherein the number of the fixing rods (6) is consistent with that of pile bottom grouting pipes (4), one ends of the fixing rods (6) penetrate out of the outer side of the annular strip (5), the other ends of the fixing rods (6) are fixed with a mounting plate (61), two symmetrical arc-shaped clamping plates (62) are hinged to the mounting plate (61), the arc-shaped clamping plates (62) are matched with the outer contour of the pile bottom grouting pipes (4), an arc-shaped notch (50) is formed in the annular strip (5) along the extending direction of the annular strip, the outer end portions of the fixing rods (6) penetrate through the arc-shaped notch (50), two limiting rings (64) are connected to the fixing rods (6) in a threaded mode, vertical strips (7) are further mounted on the fixing rods (6), two arc-shaped scraping plates (71) are hinged to one ends, far away from the fixing rods (6), of the arc-shaped scraping plates (71) and close to the vertical strips (7) are provided with resetting parts;
stake side slip casting hose (2) are in the outside of steel reinforcement cage (1) along the even interval distribution of extending direction of steel reinforcement cage (1), outer convex part (21) in step two are provided with at least three, just the junction of stake side slip casting pipe (3) and stake side slip casting hose (2) is located between adjacent outer convex part (21).
2. A method of grouting-pipe construction for post-grouting of a cast-in-place pile according to claim 1, characterised in that the side grout outlet (20) is provided on the side of the male part (21) remote from the female part (22).
3. The method for constructing the grouting pipe for post-grouting of the cast-in-place pile as claimed in claim 1, wherein the pile-side grouting pipe (3) and the pile-side grouting hose (2) are connected by a tee pipe.
4. A method for constructing a grouting pipe for post-grouting of a cast-in-place pile according to claim 1, characterized in that the bottom opening of the pile bottom grouting pipe (4) is arranged in a flared shape.
5. The method for constructing the grouting pipe for post-grouting of a cast-in-place pile as claimed in claim 1, wherein the length of the bottom of the pile bottom grouting pipe (4) extending out of the reinforcement cage (1) is 14-16 cm, and when the depth of the hole is greater than the designed depth of the hole, the length of the bottom of the pile bottom grouting pipe (4) is greater than 16 cm.
6. The method for constructing the grouting pipe for post-grouting of the cast-in-place pile according to claim 1, wherein the pile-side grouting pipe (3) is arranged outside the reinforcement cage (1), the pile-bottom grouting pipe (4) is arranged inside the reinforcement cage (1), and reinforcing ribs are arranged between the pile-side grouting pipe (3) and the pile-bottom grouting pipe (4) and the reinforcement cage (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111309637.5A CN113882384B (en) | 2021-11-06 | 2021-11-06 | Grouting pipe construction method for post-grouting of cast-in-place pile |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111309637.5A CN113882384B (en) | 2021-11-06 | 2021-11-06 | Grouting pipe construction method for post-grouting of cast-in-place pile |
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| CN113882384A CN113882384A (en) | 2022-01-04 |
| CN113882384B true CN113882384B (en) | 2022-12-09 |
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| CN2272459Y (en) * | 1995-04-10 | 1998-01-14 | 中国建筑科学研究院地基基础研究所 | Pile-side mortar-pressing device for mud wall-protection pouring pile |
| CN212722253U (en) * | 2020-06-18 | 2021-03-16 | 东莞市环境监测中心站 | Sampling gun fixing support |
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