阅读说明：本技术 桩底注浆腔及使用方法与灌注桩体及其施工方法 (Pile bottom grouting cavity and using method thereof, cast-in-place pile body and construction method thereof ) 是由 高永光 高云飞 于 2019-06-28 设计创作，主要内容包括：本发明公开了一种桩底注浆腔及使用方法与灌注桩体及其施工方法,桩底注浆腔,包括：注浆胶囊,具有内部填充有浆液以承载桩体的膨胀状态,以及内部中空的收缩状态；注浆管,与所述注浆胶囊的内腔相连通,向所述注浆胶囊内注浆；固定板,所述注浆胶囊设置在所述固定板上,所述固定板上设有与容置孔底部相连通,供所述容置孔内的泥浆和/或沉渣穿过所述固定板的通过孔。以解决现有技术中具有注浆胶囊的灌注桩在钻孔灌注桩施工过程中,导致孔壁坍塌和沉渣超标,严重影响施工质量的问题。(The invention discloses a pile bottom grouting cavity and a using method thereof, a cast-in-place pile body and a construction method thereof, wherein the pile bottom grouting cavity comprises: a grouting capsule having an expanded state in which grout is filled inside to bear the pile body, and a contracted state in which the interior is hollow; the grouting pipe is communicated with the inner cavity of the grouting capsule and used for grouting into the grouting capsule; the grouting capsule is arranged on the fixing plate, and the fixing plate is provided with a through hole which is communicated with the bottom of the containing hole and is used for allowing the slurry and/or the sediment in the containing hole to pass through the fixing plate. The method solves the problems that in the prior art, the cast-in-place pile with the grouting capsule causes hole wall collapse and excessive sediment in the cast-in-place pile construction process, and the construction quality is seriously influenced.)

1. A pile bottom grouting cavity, comprising:

a grouting capsule (2) having an expanded state in which the interior is filled with grout to support the pile body, and a contracted state in which the interior is hollow;

the grouting pipe (3) is communicated with the inner cavity of the grouting capsule (2) and used for grouting into the grouting capsule (2);

it is characterized by also comprising:

the grouting capsule (2) is arranged on the fixing plate (4), the fixing plate (4) is provided with a through hole (5) communicated with the bottom of the containing hole (1) for the mud and/or sediment in the containing hole (1) to pass through the fixing plate (4).

2. Pile bottom grouting cavity according to claim 1, characterised in that said passage hole (5) is one, arranged in the centre of said fixed plate (4), said fixed plate (4) constituting an annular plate-like structure.

3. Pile bottom grouting cavity according to claim 2, characterised in that the grouting capsule (2) is a hollow ring-shaped structure adapted to the shape of the fixing plate (4).

4. Pile-bottom grouting cavity according to claim 3, characterised in that said fixing plate (4) of annular construction has, at its inner ring edge, an annular stopper (10) extending to the inner ring of said grouting capsule (2).

5. Pile-bottom grouting chamber according to claim 4, characterised in that the height of said annular stop (10) is not greater than the sum of the designed thickness value of the sediment of said housing hole (1) and the thickness of said grouting capsule (2).

6. Pile-bottom grouting cavity according to claim 4, characterised in that the annular stop (10) is perpendicular to the surface of the fixing plate (4).

7. The pile bottom grouting cavity according to any one of claims 1 to 6, further comprising: the first one-way valve is arranged at the communication position of the grouting pipe (3) and the grouting capsule (2) so as to prevent the blockage in the grouting capsule (2) from entering the grouting pipe (3).

8. Pile bottom grouting cavity according to claim 7, characterised in that the grouting pipe (3) is provided with a first grouting hole (11) for the grouting liquid into the grouting capsule (2), the first non-return valve comprising: with first injected hole (11) on injected tube (3) sets up relatively, in order to seal first elastic component (12) of first injected hole (11), first elastic component (12) have with injected tube (3) closely laminates in order to block the plug passes through the encapsulated situation that first injected hole (11) got into injected tube (3), and receive injected tube (3) internal pressure effect orientation is kept away from injected tube (3) direction removes so that the thick liquid passes through first injected hole (11) gets into the open mode of injected capsule (2).

9. Pile bottom grouting cavity according to claim 8, characterised in that the grouting pipe (3) has a first grouting part (13) extending into the inner cavity of the grouting capsule (2), the first grouting part (13) being an annular pipe extending along the outer contour of the fixation plate (4), and the first elastic element (12) being an annular sleeve that is sleeved on the first grouting part (13).

10. The pile bottom grouting cavity according to any one of claims 1 to 9, further comprising: and the slurry supplementing structure is communicated with the through holes (5) and used for injecting slurry into the through holes (5).

11. The pile bottom grouting cavity according to claim 10, characterized in that the grout supplying structure is at least one grout supplying pipe (17), and the grout supplying pipe (17) is communicated with the through hole (5) to inject grout into the through hole (5).

12. Pile bottom grouting cavity according to claim 11, characterised in that the grout pipe (17) has a second grouting portion (18) extending into the bore of the through bore (5), that the second grouting holes (20) are plural, provided on the second grouting portion (18), that the second grouting portion (18) is an arc-shaped pipe extending along the contour of the bore wall of the through bore (5).

13. The pile bottom grouting cavity according to claim 12, characterised in that the second grouting part (18) is a ring pipe extending along the contour of the bore wall of the through bore (5).

14. Pile bottom grouting cavity according to claim 11, characterised in that the fixing plate (4) has a slurry storage cavity (19) communicating with the passage hole (5), the slurry replenishing pipe (17) communicating with a slurry inlet (21) of the slurry storage cavity (19).

15. Pile bottom grouting cavity according to any of claims 12-14, characterised in that a second non-return valve is arranged on the grout pipe (17) to control the connection or disconnection of the grout pipe (17) to or from the through hole (5).

16. The pile bottom grouting cavity of claim 15, wherein the second one-way valve comprises: with second injected hole (20) on the benefit thick liquid pipe (17) set up relatively, in order to seal second elastic component (22) of second injected hole (20), second elastic component (22) have with benefit thick liquid pipe (17) closely laminate in order to block the jam through the sealed condition of second injected hole (20) entering benefit thick liquid pipe (17), and receive benefit thick liquid pipe (17) internal pressure effect orientation is kept away from benefit thick liquid pipe (17) direction removes so that thick liquid passes through second injected hole (20) gets into the open mode of clearing hole (5).

17. Pile bottom grouting cavity according to claim 16, characterised in that the second elastic element (22) is an annular sleeve placed over the second grouting part (18).

18. Pile bottom grouting cavity according to any of claims 12-17, characterised in that said passage hole (5) is one, arranged in the centre of said fixed plate (4), said fixed plate (4) constituting an annular plate-like structure, said fixed plate (4) having its inner annular edge provided with an annular stopper (10) extending to the inner ring of said grouting capsule (2); the second grouting hole (20) of the grout filling pipe (17) is positioned on one side of the annular stopper (10) far away from the fixed plate (4).

19. Pile bottom grouting cavity according to any of claims 1-18, characterised in that the grouting capsule (2) is provided with a capsule detection port (6) for filling medium into it.

20. Pile bottom grouting cavity according to claim 19, characterised in that the capsule detection port (6) is provided on the fixing plate (4).

21. A cast-in-place pile body, comprising:

the pile bottom grouting cavity of any one of claims 1 to 20;

and the reinforcement cage (14) is connected with the fixing plate (4) of the pile bottom grouting cavity, and the grouting pipe (3) is fixedly connected with the reinforcement cage (14).

22. A bored pile body according to claim 21, further comprising a pile-side grouting pipe (15) fixed to said reinforcement cage (14), said pile-side grouting pipe (15) having a first grouting hole provided near said grouting capsule (2) for grouting into the pile-side ground.

23. A method for constructing a bored concrete pile according to claim 21 or 22, including the steps of:

s1, forming a containing hole (1), and cleaning sediments in the containing hole (1);

s2, sinking the reinforcement cage (14) with the lower end provided with the pile bottom grouting cavity to the bottom of the accommodating hole (1);

s3, discharging the sediments on the lower side of the fixing plate (4) through the through holes (5);

s4, pouring concrete into the accommodating hole (1) to form a pouring pile;

and S5, grouting into the grouting capsule (2) to form a pile bottom expanded head.

24. The method of constructing a bored pile body according to claim 23, wherein the discharging the sludge on the lower side of the fixing plate (4) through the passing hole (5) in step S3 includes: and controlling the negative pressure suction pipe to align with the through hole (5) and discharging the sediment at the bottom of the accommodating hole (1).

25. The method for constructing a bored pile body according to claim 23 or 24, further comprising step S6: grouting the bottom of the cast-in-place pile body through a grout filling pipe (17) penetrating through the through hole (5).

26. The method of constructing a bored concrete pile according to claim 23, further comprising: and step S7, grouting towards the stratum at the side part of the cast-in-place pile body.

27. A method of using the pile bottom grouting cavity of any one of claims 1-20, comprising:

cleaning the grouting pipe (3);

and grouting into the grouting capsule (2).

28. Method for using a pile bottom grouting cavity according to claim 27, characterised in that the washing of the grouting pipe (3) comprises in particular: s1, opening at least two grouting pipes (3) connected together through a first grouting part (13); s2, injecting cleaning liquid into at least one grouting pipe (3) of the at least two grouting pipes (3) in the open state, discharging the cleaning liquid from the other grouting pipe (3) which is in the open state and is not injected with the cleaning liquid, wherein the pressure in the grouting pipe (3) is smaller than the pressure for opening the first one-way valve.

29. The method for using a pile bottom grouting cavity according to claim 27, wherein the grouting into the grouting capsule (2) comprises in particular: and injecting grout into the grouting pipe (3) in an open state, wherein the pressure in the first grouting part (13) is greater than the biasing force of the first elastic member (4), and the grout overflows through a gap between the first elastic member (4) and the first grouting part (13) and enters the grouting capsule (2).

Technical Field

The invention relates to the technical field of foundation foundations, in particular to a pile bottom grouting cavity, a using method, a grouting pile body and a construction method thereof.

Background

At present, in the field of foundation foundations, open grouting is generally adopted in post-grouting of cast-in-place piles. However, open grouting has the problems of low controllability of a grouting area, small forming effect on a pile end expanding head and a surrounding stratum, and small improvement range of the bearing capacity of the pile end.

In order to solve the problem of open grouting. In the prior art, a grouting device for a cast-in-place pile with a grouting capsule is disclosed, which comprises a grouting pipe, a steel bottom plate, a grouting interface and a grouting capsule, wherein the grouting interface extends out of the upper part and the lower part of the steel bottom plate; and the upper part of the grouting pipe is connected with a grouting pump. However, the above-mentioned bored pile with grouting capsules has significant drawbacks in bored pile construction, particularly in construction using a slurry retaining wall. When the steel plate grouting capsule is installed at the bottom of the steel reinforcement cage to serve as a post-grouting container, in the process of descending to the bottom of a hole along with the steel reinforcement cage, the steel reinforcement cage with the protective steel plate acts like a piston in a drill hole, so that mud in the drill hole is difficult to discharge upwards, eddy currents for damaging the hole wall can be formed in mud water, mud water currents rotating between the edge of the steel plate and the hole wall scour and disturb the hole wall of the drill hole at the same time, and the problem of collapse of the hole wall of the drill hole is caused. And, above-mentioned steel bottom plate also can scrape the drilling pore wall, further aggravates the collapse of drilling pore wall, and the pore wall collapses and causes the drilling after the hole cleaning to the hole bottom sediment behind the slip casting container to the bottom exceeds standard, and the upside of steel bottom plate also can pile up the silt that falls down from the drilling pore wall simultaneously and cause the sediment to exceed standard, seriously influences the quality of drilling bored concrete pile, causes the problem of disconnected stake even.

Disclosure of Invention

Therefore, the invention aims to provide a pile bottom grouting cavity, a using method, a cast-in-place pile body and a construction method thereof, and aims to solve the problems that in the prior art, a cast-in-place pile with a grouting capsule causes hole wall collapse and excessive sediment in the cast-in-place pile construction process, and the construction quality is seriously influenced. Therefore, the invention provides a pile bottom grouting cavity, which comprises:

a grouting capsule having an expanded state in which grout is filled inside to bear the pile body, and a contracted state in which the interior is hollow;

the grouting pipe is communicated with the inner cavity of the grouting capsule and used for grouting into the grouting capsule;

further comprising:

the grouting capsule is arranged on the fixing plate, and the fixing plate is provided with a hole bottom communicated with the containing hole, so that slurry and/or sediment in the containing hole can pass through the through hole of the fixing plate.

The through hole is one and is arranged at the central position of the fixing plate, and the fixing plate forms an annular plate-shaped structure.

The grouting capsule is a hollow annular structure matched with the shape of the fixing plate.

The inner ring edge of the fixing plate of the annular structure is provided with an annular stop piece extending to the inner ring of the grouting capsule.

The height of the annular stopper is not more than the sum of the designed thickness value of the sediment of the containing hole and the thickness of the grouting capsule in a contracted state.

The annular stopper is perpendicular to the surface of the fixed plate.

Pile base slip casting chamber still includes: the first one-way valve is arranged at the communication position of the grouting pipe and the grouting capsule so as to prevent a blockage in the grouting capsule from entering the grouting pipe.

Be provided with on the slip casting pipe and supply thick liquids to get into the first injected hole in the slip casting capsule, first check valve includes: the first elastic piece is arranged opposite to the first grouting hole in the grouting pipe to seal the first grouting hole, and the first elastic piece is in a sealing state tightly attached to the grouting pipe to prevent the blocking object from entering the grouting pipe through the first grouting hole and is moved towards the direction far away from the first grouting part under the action of pressure in the grouting pipe to enable the grout to enter the opening state of the grouting capsule through the first grouting hole.

The grouting pipe is provided with a first grouting part extending into an inner cavity of the grouting capsule, the first grouting part is an annular pipeline extending along the outer contour of the fixing plate, and the first elastic part is an annular sleeve sleeved on the first grouting part.

Pile bottom slip casting chamber, still include: and the slurry supplementing structure is communicated with the through hole and used for injecting slurry into the through hole.

The slurry supplementing structure is at least one slurry supplementing pipe, and the slurry supplementing pipe is communicated with the through hole and used for grouting into the through hole.

The grout supplementing pipe is provided with a plurality of second grouting parts extending into the hole cavities of the through holes, and the second grouting holes are arranged on the second grouting parts and extend along the outlines of the hole walls of the through holes.

The second grouting part is an annular pipeline extending along the contour of the hole wall of the through hole.

The fixed plate is provided with a pulp storage cavity communicated with the through hole, and the pulp supplementing pipe is communicated with the pulp inlet of the pulp storage cavity.

And the pulp supplementing pipe is provided with a second one-way valve for controlling the connection or disconnection of the pulp supplementing pipe and the through hole.

The second check valve includes: with second injected hole on the benefit thick liquid pipe sets up relatively, in order to seal the second elastic component in second injected hole, the second elastic component have with benefit thick liquid pipe closely laminates in order to block the plug and pass through the sealed state that second injected hole got into the benefit thick liquid pipe, and receive the intraductal pressure action orientation of benefit thick liquid is kept away from benefit thick liquid pipe direction removes so that thick liquid passes through the second injected hole gets into the open mode through the hole.

The second elastic piece is an annular sleeve sleeved on the second grouting part.

The through hole is one and is arranged at the center of the fixing plate, the fixing plate forms an annular plate-shaped structure, and the inner ring edge of the fixing plate is provided with an annular stopper extending to the inner ring of the grouting capsule; and the second grouting hole of the grout supplementing pipe is positioned on one side of the annular stopper far away from the fixed plate.

The grouting capsule is provided with a capsule detection port for filling media into the grouting capsule to verify whether the grouting capsule leaks and/or can bear pressure, and the expansion and contraction capacity and the volume of the grouting capsule under the action of slurry can be effectively checked by detecting the pressure which can be borne by the grouting capsule.

The capsule detection port is arranged on the fixing plate.

A cast-in-place pile body, comprising:

the pile bottom grouting cavity;

and the reinforcing cage is connected with the fixing plate of the pile bottom grouting cavity, and the grouting pipe is fixedly connected with the reinforcing cage.

The cast-in-place pile body further comprises a pile side grouting pipe fixed on the reinforcement cage, and a first grouting hole of the pile side grouting pipe is formed in the position close to the grouting capsule and faces the pile side stratum for grouting.

The construction method of the cast-in-place pile body comprises the following steps:

s1, forming a containing hole, and cleaning sediments in the containing hole;

s2, sinking the reinforcement cage with the lower end provided with the pile bottom grouting cavity to the bottom of the accommodating hole;

s3, discharging the sediments at the lower side of the fixing plate through the through holes;

s4, pouring concrete into the accommodating holes to form pouring piles;

and S5, grouting into the grouting capsule to form the pile bottom expanded head.

The method for constructing a bored concrete pile body, wherein the step S3 of discharging the sediment on the lower side of the fixing plate through the passage hole includes: and controlling the negative pressure suction pipe to align to the through hole, and discharging the sediment at the bottom of the accommodating hole.

The construction method of the cast-in-place pile body further comprises the step S6: and grouting the pile bottom through a grout supplementing pipe penetrating through the through hole.

The construction method of the cast-in-place pile body further comprises the following steps: and step S7, grouting towards the pile side stratum.

The use method of the pile bottom grouting cavity comprises the following steps:

cleaning the grouting pipe;

and grouting into the grouting capsule.

The washing slip casting pipe specifically includes: s1, opening at least two grouting pipes connected together through a first grouting part; and S2, injecting a cleaning liquid into at least one grouting pipe of the at least two grouting pipes in the open state, discharging the cleaning liquid from the other grouting pipe which is in the open state and is not injected with the cleaning liquid, wherein the pressure in the grouting pipe is less than the pressure for opening the first one-way valve.

The step of injecting the slurry into the slurry injection capsule specifically comprises the following steps: and injecting grout into the grouting pipe in an open state, wherein the pressure in the first grouting part is greater than the biasing force of the first elastic member, and the grout overflows through a gap between the first elastic member and the first grouting part and enters the grouting capsule.

The technical scheme of the invention has the following advantages:

1. the invention provides a pile bottom grouting cavity, which comprises: a grouting capsule having an expanded state in which grout is filled inside to bear the pile body, and a contracted state in which the interior is hollow; the grouting pipe is communicated with the inner cavity of the grouting capsule and used for grouting into the grouting capsule; the grouting capsule is arranged on the fixing plate, and the fixing plate is provided with a through hole communicated with the bottom of the accommodating hole for allowing the slurry and/or sediment in the accommodating hole to pass through the through hole of the fixing plate. Through the through holes arranged on the fixing plate, in the process that the pile bottom grouting cavity sinks towards the hole bottom of the containing hole, slurry, air and the like in the containing hole can enter the top of the pile bottom grouting cavity through the through holes, eddy currents for damaging the hole wall cannot be formed between the pile bottom grouting cavity and the containing hole, the problem that the eddy currents for damaging the hole wall cannot be formed in the containing hole due to the fact that slurry and the like cannot be discharged in the descending process of the pile bottom grouting cavity is effectively avoided, the slurry water flow between the edge of the fixing plate and the containing hole is prevented from scouring and disturbing the hole wall of the containing hole, the problems that the hole wall of the containing hole collapses, the sediment at the hole bottom exceeds the standard and the pile is broken are effectively avoided, and the construction quality and progress of a cast-in-place pile body are effectively improved.

2. According to the pile bottom grouting cavity provided by the invention, the number of the through holes is one, the through holes are arranged in the center of the fixing plate, and the fixing plate forms an annular plate-shaped structure. The through hole is arranged at the central position of the fixing plate, so that all positions of the pile bottom grouting cavity can be relatively balanced in the sinking process, the problem of position deflection of the pile bottom grouting cavity in the sinking process is solved, and the grouting cavity can smoothly reach the bottom of the hole. Moreover, more space can be reserved for the through holes by the arrangement mode of the through holes, so that the hole diameter of the through holes can be effectively increased, muddy water and the like are guaranteed to effectively pass through the through holes, and eddy currents for damaging the hole walls cannot be formed.

3. According to the pile bottom grouting cavity provided by the invention, the grouting capsule is of a hollow annular structure matched with the fixed plate in shape. Through designing into the hollow ring structure with fixed plate shape looks adaptation with the slip casting capsule to guaranteeing that muddy water etc. can loop through slip casting capsule and fixed plate entering pile bottom slip casting chamber upper strata effectively, can not form under the prerequisite that destroys the vortex of pore wall between pile bottom slip casting chamber and holding hole pore wall. And because the grouting capsule is matched with the fixed plate in shape, the size of the grouting capsule can be effectively increased, the grouting capsule can furthest fix and support the cast-in-place pile body, and the firmness and the bearing capacity of the cast-in-place pile body are improved.

4. According to the pile bottom grouting cavity provided by the invention, the inner ring edge of the fixing plate of the annular structure is provided with the annular stop piece extending to the inner ring of the grouting capsule. In the work progress of bored concrete pile body, need be to installing the steel reinforcement cage pouring concrete in stake end grouting cavity in order to form the bored concrete pile body, above-mentioned annular keeps off can form one effectively at the clearing hole edge and stops the piece with concrete and slip casting capsule are separated to when preventing to pour concrete in the steel reinforcement cage towards, the problem of concrete through above-mentioned clearing hole parcel slip casting capsule avoids the slip casting capsule because of being wrapped up in the problem emergence of the grouting effect behind the influence bored concrete pile by the concrete.

5. According to the pile bottom grouting cavity provided by the invention, the height of the annular stopper is not more than the sum of the designed thickness value of the sediment of the accommodating hole and the thickness of the grouting capsule. The height of the annular stopper is set to be smaller than or equal to the sum of the designed thickness value of the sediment of the containing hole and the thickness of the grouting capsule, so that the pile bottom grouting cavity is guaranteed to sink to a specified position, and the designed thickness of the sediment exceeds the standard when the annular stopper abuts against the bottom of the containing hole. And through the annular blocking piece with the height smaller than or equal to the designed thickness of the sediment, after the sediment is cleaned in the accommodating hole through the hole, the annular blocking piece is abutted against the bottom of the accommodating hole, so that whether the thickness of the sediment in the accommodating hole is in a qualified range can be effectively detected, the operation and construction of construction personnel are facilitated, and the construction quality is ensured.

6. According to the pile bottom grouting cavity provided by the invention, the annular stopper is vertical to the surface of the fixed plate, and the annular stopper is vertical to the fixed plate, so that the annular stopper can effectively protect a grouting capsule, and simultaneously, mud water and the like in the accommodating hole can rapidly pass through the through hole and enter the upper part of the pile bottom grouting cavity, and eddy currents which damage the hole wall cannot be formed, and further the construction quality and the construction progress of a cast-in-place pile body are influenced.

7. The pile bottom grouting cavity provided by the invention further comprises: the first check valve is arranged at the communication position of the grouting pipe and the grouting capsule so as to prevent the mixture of silt, sediment and the like in the grouting capsule from entering the grouting pipe. Through above-mentioned first check valve can prevent effectively that when the circumstances such as the slip casting capsule emergence is broken, when the outside pressure of slip casting pipe is greater than the inside pressure of slip casting pipe, mixture such as silt, sediment that get into in the slip casting capsule get into the slip casting pipe, or cause the slip casting to break because of mechanical failure to cause the problem of slip casting pipe jam, so that the unable problem of using of pile bottom slip casting chamber. Moreover, the first one-way valve can effectively prevent the mixture of silt, sediment and the like from entering the grouting pipe, and further, under the condition that the grouting capsule is damaged before grouting and sediment mixture enters, the grouting can still be continuously grouted towards the direction of the grouting capsule through the grouting pipe; or under the condition that grouting is interrupted due to mechanical failure, the grouting pipe is flushed in time to ensure that the pipeline is unblocked, repeated grouting can be realized, the formation of the pile end enlarged head and the compaction effect on surrounding strata are ensured, and the bearing capacity of the pile end is improved.

8. The pile bottom grouting cavity provided by the invention is characterized in that the grouting pipe is provided with a first grouting hole for allowing a grouting liquid to enter the grouting capsule, and the first one-way valve comprises: with first slip casting hole on the slip casting pipe sets up relatively, in order to seal the first elastic component in first slip casting hole, first elastic component have with the slip casting pipe closely laminates in order to block mixture such as silt, sediment and pass through the sealed condition that first slip casting hole got into the slip casting pipe, and receives the intraductal pressure action orientation of slip casting is kept away from first slip casting portion direction removes so that the thick liquid passes through first slip casting hole gets into the open mode of slip casting capsule. Above-mentioned first elastic component sets up in the position that slip casting pipe its is linked together with the slip casting capsule, works as pressure in the first slip casting portion is less than its self contraction pressure of first elastic component and external pressure sum, first elastic component can laminate mutually with the slip casting pipe under the biasing force effect that its self contraction pressure produced in order to block off first slip casting hole to avoid mixture such as silt, sediment to get into the slip casting pipe through first slip casting hole effectively and in order to block up the slip casting pipe, cause the unable problem to the slip casting of stake end slip casting chamber. When the pressure in the first grouting part is greater than the sum of the self contraction pressure of the first elastic part and the external pressure, the grout overflows through a gap between the first elastic part and the first grouting part and enters a grouting capsule; or into the formation through a broken grouting capsule. Can take place the one-way mud discharging of slip casting pipe through the above-mentioned first elastic component that deforms can simply guarantee effectively to guarantee that the unable slip casting pipe that gets into of mixture in the slip casting intracavity at the bottom of the pile, and can also realize the slip casting when the slip casting capsule breaks and consolidate the stratum at the bottom of the pile, improve pile end bearing capacity.

9. The pile bottom grouting cavity provided by the invention is characterized in that the grouting pipe is provided with a first grouting part extending into the inner cavity of the grouting capsule, the first grouting part is an annular pipeline extending along the outer contour of the fixing plate, and the first elastic part is an annular sleeve sleeved on the first grouting part. The annular first grouting part can effectively adapt to a grouting capsule with an annular structure, so that the first grouting part extends to different positions of the grouting capsule, and grouting of a pile bottom grouting cavity is more uniform; and first elastic component cover is put in tubular structure's first slip casting portion, can wrap up tubular structure's first slip casting portion effectively through the first elastic component of above-mentioned annular sleeve structure to guarantee that first elastic component can be effectual when the intraductal pressure of first slip casting portion is less than the outside of tubes, seal first slip casting hole effectively, prevent from each angle that mixtures such as hole bottom silt, sediment from getting into the slip casting pipe.

10. The pile bottom grouting cavity provided by the invention further comprises: and the slurry supplementing structure is communicated with the through hole and used for injecting slurry into the through hole. The grout is injected to the pile bottom through the through hole by the grout supplementing structure, so that the cement paste content of the pile bottom can be effectively improved, and the quality of concrete at the pile bottom is improved. The following advantages are achieved by grouting into the through hole: effectively eliminating the false tip and dry ballast formed by concrete segregation at the pile bottom part caused by too large drop height due to the concrete falling from the slender guide pipe. The strength of the pile bottom is enhanced by effectively filling the through holes. And (3) pressure permeation grouting, wherein water in the stratum around the pile bottom is replaced through grouting, and the strength of the pile bottom is enhanced. Grout is injected into the stratum around the pile bottom through the through holes to form grout veins, so that the strength of the pile bottom is enhanced.

11. According to the pile bottom grouting cavity provided by the invention, the grouting structure is at least one grouting pipe, and the grouting pipe is communicated with the through hole and used for grouting into the through hole. The long-distance through-hole grouting can be simply and conveniently carried out through the grout supplementing pipe.

12. The pile bottom grouting cavity provided by the invention is characterized in that the grout supplementing pipe is provided with a plurality of second grouting parts extending into the hole cavity of the through hole, the second grouting parts are arranged on the second grouting parts, and the second grouting parts are arc-shaped pipelines extending along the hole wall contour of the through hole. The arc-shaped pipeline or the annular pipeline with the plurality of second grouting holes can effectively increase the grouting efficiency of the second grouting portion. Meanwhile, slurry flows into the bottom stratum in all directions, and the grouting effect is guaranteed.

13. According to the pile bottom grouting cavity provided by the invention, the fixing plate is provided with the grout storage cavity communicated with the through hole, and the grout supplementing pipe is communicated with the grout inlet of the grout storage cavity. The slurry enters the through hole through the slurry supplementing pipe and the slurry storage cavity on the fixing plate, and the slurry can be effectively and uniformly and stably injected into the through hole in the mode.

14. According to the pile bottom grouting cavity provided by the invention, the grout supplementing pipe is provided with the second one-way valve for controlling the connection or disconnection of the grout supplementing pipe and the through hole. So as to prevent the mixture of silt, sediment and the like passing through the hole from entering the slurry supplementing pipe.

15. The invention provides a pile bottom grouting cavity, wherein the second one-way valve comprises: with second injected hole on the benefit thick liquid pipe sets up relatively, in order to seal the second elastic component in second injected hole, the second elastic component have with benefit thick liquid pipe closely laminates in order to block the plug and pass through the sealed state that second injected hole got into the benefit thick liquid pipe, and receive the intraductal pressure action orientation of benefit thick liquid is kept away from benefit thick liquid pipe direction removes so that thick liquid passes through the second injected hole gets into the open mode through the hole. Can take place the one-way thick liquid of arranging of benefit thick liquid pipe simply effectively through the aforesaid second elastic component that deforms to guarantee to pass through the unable entering of downthehole mixture of mending thick liquid pipe.

16. The pile bottom grouting cavity provided by the invention is provided with one through hole which is arranged at the central position of the fixing plate, the fixing plate forms an annular plate-shaped structure, and the inner ring edge of the fixing plate is provided with an annular stopper extending to the inner ring of the grouting capsule; and the second grouting hole of the grout supplementing pipe is positioned on one side of the annular stopper far away from the fixed plate. The second grouting hole is formed in one side, far away from the fixing plate, of the annular blocking piece, so that the grout can be effectively filled in the hole in the middle of the inner ring of the grouting capsule, and the content of the formation cement slurry at the bottom of the pile bottom grouting cavity is effectively increased.

17. According to the pile bottom grouting cavity provided by the invention, the grouting capsule is provided with the capsule detection port for filling media into the grouting capsule so as to verify whether the grouting capsule leaks and/or can bear the pressure. Air, water or other media are filled into the grouting capsule through the capsule detection port, so that the pressure which can be borne by the grouting capsule can be effectively verified, and the expansion and contraction capacity and the volume of the grouting capsule under the action of the grout can be tested.

18. According to the pile bottom grouting cavity provided by the invention, the capsule detection port is arranged on the fixing plate, so that the operation of a construction party can be facilitated, and the operation difficulty of a user is reduced.

19. According to the pile bottom grouting cavity provided by the invention, the first elastic piece and the second elastic piece are respectively provided with a fixing part of the first grouting part and a fixing part of the second grouting part. The first elastic piece is fixedly connected with the first grouting part, so that the first elastic piece can be effectively prevented from deviating from a preset position under the action of grouting pressure when grouting is carried out towards the inner cavity of the grouting capsule through the first grouting hole, and the first elastic piece loses the sealing capacity on the first grouting hole; similarly, the fixing portion can also effectively fix the second elastic element on the second grouting portion.

20. The invention provides a cast-in-place pile body, which comprises: a pile bottom grouting cavity; the steel reinforcement cage, with its fixed plate in stake end slip casting chamber links to each other, the slip casting pipe with steel reinforcement cage is fixed to be connected, and the bored concrete pile body has arbitrary the advantage in the above-mentioned scheme because of having arbitrary pile end slip casting chamber in the above-mentioned scheme.

21. The invention provides a construction method of a cast-in-place pile body, which comprises the following steps: s1, forming a containing hole, and cleaning sediments in the containing hole; s2, sinking the reinforcement cage with the lower end provided with the pile bottom grouting cavity to the bottom of the accommodating hole; s3, discharging the sediment at the bottom of the fixing plate through the through holes; s4, pouring concrete into the accommodating holes to form pouring piles; and S5, grouting into the grouting capsule to form the pile bottom expanded head. Through the through holes, a construction side can discharge sediments on the lower side of the fixing plate effectively, so that the thickness of the sediments in the accommodating holes is effectively guaranteed to be in a qualified range, construction personnel can operate and construct conveniently, and construction quality is guaranteed.

22. The construction method of the cast-in-place pile body provided by the invention has the advantages that the cast-in-place pile body further comprises a pile side grouting pipe fixed on the reinforcement cage, and a first grouting hole of the pile side grouting pipe is arranged at a position close to the grouting capsule and faces the pile side stratum for grouting. Through carrying out pressure slip casting to the stratum around the bored concrete pile body lateral wall, make the stratum around the pile body compacter, intensity is higher, also makes the bored concrete pile and the stratum around combine inseparabler, finally makes the ultimate bearing capacity of stake improve by a wide margin.

23. According to the cast-in-place pile body provided by the invention, the negative pressure suction pipe controlled by the vacuum discharge press machine is connected to be aligned to the through hole, so that the sediment at the bottom of the containing hole is discharged, the negative pressure suction pipe can continuously and effectively discharge the sediment, and the sediment discharge efficiency is improved.

24. The construction method of the cast-in-place pile body, provided by the invention, further comprises the step S6: and grouting the pile bottom through a grout supplementing pipe penetrating through the through hole. The grout is injected to the pile bottom through the through hole by the grout supplementing structure, so that the cement paste content of the pile bottom can be effectively improved, and the quality of concrete at the pile bottom is improved. The following advantages are achieved by grouting into the through hole: effectively eliminating the false tip and dry ballast formed by concrete segregation at the pile bottom part caused by too large drop height due to the concrete falling from the slender guide pipe. The strength of the pile bottom is enhanced by effectively filling the through holes. And (3) pressure permeation grouting, wherein water in the stratum around the pile bottom is replaced through grouting, and the strength of the pile bottom is enhanced. Grout is injected into the stratum around the pile bottom through the through holes to form grout veins, so that the strength of the stratum at the pile bottom is enhanced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic view of an internal structure of a pile bottom grouting cavity provided by the invention;

FIG. 2 is a schematic view of the top-view internal structure of a pile bottom grouting cavity provided by the invention;

FIG. 3 is a schematic structural diagram of the interior of a pile bottom grouting cavity provided by the invention and provided with a first check valve and a second check valve;

FIG. 4 is a schematic construction diagram of a cast-in-place pile body according to the present invention;

FIG. 5 is a schematic structural view of a receiving hole provided in the present invention;

FIG. 6 is a schematic structural view of the inner part of a pile bottom grouting cavity of a single grout-filling pipe provided by the invention;

fig. 7 is a schematic view of the internal structure of the pile bottom grouting cavity with the grout storage cavity provided by the invention.

Description of reference numerals:

1-a containing hole; 2-grouting capsules; 3-grouting pipe; 4, fixing a plate; 5-through hole; 6-capsule detection port; 10-an annular stop; 11-first grouting holes; 12-a first elastic member; 13-grouting part; 14-a reinforcement cage; 15-pile side grouting pipe; 16-grouting pipe interface; 17-a slurry supplementing pipe; 18-a second grouting section; 19-pulp storage cavity; 20-a second grouting hole; 21-a pulp inlet; 22-a second elastic member; 23-fixing member.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.