CN114059575B

CN114059575B - Bearing platform and pile foundation connecting structure and construction method thereof

Info

Publication number: CN114059575B
Application number: CN202111390479.0A
Authority: CN
Inventors: 叶土木; 陆晓文; 陈杰; 陈胜旺; 刘旋; 陈诗琪; 邱剑锋; 赵建军
Original assignee: Zhejiang Hengchen Construction Group Co ltd
Current assignee: Zhejiang Hengchen Construction Group Co ltd
Priority date: 2021-11-23
Filing date: 2021-11-23
Publication date: 2023-03-31
Anticipated expiration: 2041-11-23
Also published as: CN114059575A

Abstract

The invention discloses a bearing platform and pile foundation connecting structure and a construction method thereof, relating to the technical field of building construction and comprising a pile, wherein the top of the pile is provided with a coring hole; the pile top part is positioned in the bottom of the bearing platform; the supporting pipe is embedded in the bearing platform, the supporting pipe is aligned with the coring hole and fixedly arranged at the top of the pile, and the peripheral wall of the supporting pipe is provided with a grout flowing hole; and the gravel slurry layer is filled in the coring holes and the slurry flowing holes. Compare in traditional mode and get core slip casting and construct the cushion cap again, this scheme reduces new and old concrete and combines the number of times, improves the construction progress. This application has the effect that improves pile cap basis bearing capacity.

Description

Bearing platform and pile foundation connecting structure and construction method thereof

Technical Field

The invention relates to the technical field of building construction, in particular to a bearing platform and pile foundation connecting structure and a construction method thereof.

Background

Pile cap foundation is a form of foundation structure, and is a deep foundation formed by combining piles and cap. The pile cap foundation has high bearing capacity, small and uniform settlement, is widely applied to various types of projects, and is particularly suitable for heavy buildings built on soft foundations.

At present, the construction process of the pile cap foundation is as follows:

s1, forming a pile hole, and pouring pile concrete after arranging a pile reinforcement cage;

s2, leveling a working surface, breaking pile heads, pouring a cushion layer and building a brick moulding bed;

and S3, hoisting a bearing platform reinforcement cage, and pouring bearing platform concrete.

With respect to the above-described related art, the inventors consider that: the pile foundation needs core-pulling sampling, and the step S2 is adopted, so that the structure of the pile is easy to damage, the capacity of the pile bearing platform is reduced, and finally the bearing performance of the pile bearing platform foundation is reduced.

Disclosure of Invention

In order to improve the bearing performance of a pile cap foundation, the application provides a structure for connecting a cap and a pile foundation and a construction method thereof.

A connection structure of bearing platform and pile foundation and its construction method includes

The top of the pile is provided with a core taking hole;

the pile top part is positioned in the bottom of the bearing platform;

the supporting pipe is embedded in the bearing platform, the supporting pipe is aligned with the coring hole and fixedly arranged at the top of the pile, and the peripheral wall of the supporting pipe is provided with a grout flowing hole;

and the gravel slurry layer is filled in the coring holes and the slurry flowing holes.

Through adopting above-mentioned technical scheme, accomplish the stake of the sample of loosing core, to getting the downthehole clearance of core and packing gravel to the hole is got in the shutoff temporarily. Leveling the working surface, breaking vertical ribs of the straightened pile behind the pile head, building a brick film of the bearing platform after pouring a cushion layer of the bearing platform, hoisting a steel reinforcement cage of the bearing platform, and welding and fixing the vertical ribs of the pile and the steel reinforcement cage of the bearing platform. The bottom end of the supporting tube is aligned with the coring hole and fixedly installed at the top of the pile, and the peripheral wall of the supporting tube can be welded and fixed with the bearing platform reinforcement cage. And pouring the concrete of the bearing platform, wherein along with the rise of the liquid level of the concrete of the bearing platform, slurry in the concrete sequentially enters the supporting tube and the coring hole through the slurry flowing hole, and the slurry of the concrete and gravel form a gravel slurry layer after final setting. Compare in traditional mode core slip casting and construct the cushion cap again, this scheme reduces new and old concrete and combines the number of times, improves the construction progress to finally make this application have the advantage that improves pile cushion cap basis bearing capacity.

Optionally, the supporting tube is connected with a pressure tube in a lifting manner;

the bearing platform is characterized in that the top of the bearing platform is a bottom plate, one end of the pressure pipe is located in the bearing platform, and the other end of the pressure pipe is not lower than the top surface of the bottom plate.

Through adopting above-mentioned technical scheme, because of the relative stay tube liftable of pressure pipe, the elevation point can be regarded as at the pressure pipe top, for example, use the spirit level to confirm bottom plate top elevation, and when pouring the cushion cap concrete, utilize and take out pressure equipment, make stay tube and get the downthehole negative pressure cavity that forms of core, cushion cap concrete then gets into easily and gets core hole and gravel formation gravel thick liquid layer, when the head liquid level in the stay tube is suitable, use mud jacking equipment then to make the gravel thick liquid layer stable closely knit.

Optionally, a mounting plate is arranged at the bottom of the supporting tube in a penetrating mode, a bolt piece is arranged on the mounting plate in a penetrating mode, and the bolt piece fixes the mounting plate on the pile top.

Through adopting above-mentioned technical scheme, utilize bolt spare, then conveniently fix the mounting panel at the stake top, and then make things convenient for preliminary fixed stay tube, stay tube and cushion cap steel reinforcement cage welding are then further fixed.

Optionally, the installation groove has been seted up to the downthehole roof of coring, be equipped with the sealing member in the installation groove, the sealing member offsets with the mounting panel bottom.

Through adopting above-mentioned technical scheme, use the sealing member then can interim shutoff get the core hole, it is downthehole to reduce follow-up sewage to get into to get the core, and the production of sewage then is because of the working face is in the low-lying department and accumulates rain dirty easily, and then weakens sewage and influences the shaping quality of gravel thick liquid layer.

Optionally, the sealing member includes the sealing ring, the sealing ring inner wall offsets with the stay tube, the annular has been seted up to the sealing ring periphery wall, the embedded water stopping strip that meets water inflation that is equipped with of annular, the water stopping strip that meets water inflation is located the outside perisporium of annular and offsets with the mounting groove inner wall.

Through adopting above-mentioned technical scheme, meet water inflation sealing rod and have benign stagnant water performance, when sewage meets water inflation sealing rod, meet water inflation sealing rod inflation extrusion mounting groove inner wall and sealing ring respectively, and then extrude sealing performance between sealed stay tube and the mounting groove inner wall respectively, and improve the operation environment of taking out pressure or pressurization.

Optionally, an annular sealing groove is formed in the peripheral wall of the pressure pipe, a sealing sleeve is sleeved in the sealing groove, and the outer wall of the sealing sleeve is in interference fit with the inner wall of the supporting pipe.

Through adopting above-mentioned technical scheme, seal cover and stay tube inner wall interference fit can realize further strengthening sealed effect on the one hand, and on the other hand can realize that the pressure pipe goes up and down relative stay tube.

Optionally, a balance hole is formed in the circumferential wall of the support tube above the seal sleeve.

By adopting the technical scheme, the balance hole is positioned above the sealing sleeve, so that the pressure pumping in the pressure pumping stage is facilitated, and the pressurization and the fixation in the pressurization stage are facilitated.

A bearing platform and pile foundation connecting structure and a construction method thereof comprise the following steps:

s1, a drilling machine is in place, a core hole is formed, and gravels with the same grade as the pile are filled into the core hole;

s2, the pneumatic pick is in place, the pile head is broken, a cushion layer of the bearing platform is poured, and a moulding bed of the brick of the bearing platform is built;

s3, fixedly installing the bottom of the supporting tube at the top of the pile, and hoisting a bearing platform reinforcement cage;

s4, pouring bearing platform concrete, and filling the grout in the concrete into the coring holes through the grout holes;

and S5, finally solidifying the concrete flow slurry and the gravels in the bearing platform in the coring holes to form a gravel slurry layer.

By adopting the technical scheme, the bearing platform concrete flow is accelerated by the pumping equipment to enter the coring hole, and the concrete flow and gravel in the cavity formed among the pressure pipe, the supporting pipe and the inner wall of the coring hole are pressurized and kept solid by the grouting equipment, so that the molding quality of a gravel layer is improved.

In summary, the present application includes at least one of the following beneficial technical effects:

1. compared with the traditional method of coring, grouting and re-constructing the bearing platform, the scheme reduces the combination times of new concrete and old concrete, improves the construction progress, and finally has the advantage of improving the bearing performance of the pile bearing platform foundation;

2. the water-swelling sealing rod swells and extrudes the inner wall of the mounting groove and the sealing ring respectively when meeting water, so that the sealing performance between the sealing support tube and the inner wall of the mounting groove is extruded respectively, and the working environment of pumping or pressurizing is improved;

3. the pressure equipment accelerates the concrete flow of the bearing platform to enter the coring hole, and the pressure equipment pressurizes and fixes the concrete flow and gravel in a cavity formed among the pressure pipe, the supporting pipe and the inner wall of the coring hole, so that the molding quality of a gravel layer is improved.

Drawings

FIG. 1 is a schematic cross-sectional view of an inner portion of an exemplary embodiment of the present disclosure;

FIG. 2 is an enlarged schematic view of the embodiment A of the present application;

FIG. 3 is an enlarged schematic view of embodiment B of the present application;

FIG. 4 is a schematic cross-sectional view of the inner part of the second embodiment of the present application;

FIG. 5 is a schematic view of the support tube of the embodiment of the present application;

fig. 6 is a schematic cross-sectional view of the inside of the display state three according to the embodiment of the present application.

Description of reference numerals: 1. piling; 11. core taking holes; 12. mounting grooves; 2. a bearing platform; 21. a cushion layer; 3. a base plate; 4. supporting a tube; 41. a slurry flowing hole; 42. a balance hole; 43. mounting a plate; 44. a bolt member; 46. a slurry guide pipe; 461. slurry guide holes; 5. a gravel slurry layer; 6. a pressure pipe; 61. a sealing groove; 62. sealing sleeves; 7. a seal member; 71. a seal ring; 72. a ring groove; 73. a rainwater expansion water stop strip; 8. a pressure extraction device; 9. grouting equipment.

Detailed Description

The present application is described in further detail below with reference to figures 1-6.

The embodiment of the application discloses

cushion cap

2 and 1 base connection structure of stake, refer to fig. 1, and it includes stake 1, cushion cap 2, stay tube 4 and

pressure pipe

6, and 2 bottoms of cushion cap are pour and are formed with

bed course

21, and 1 tops of stake pass bed course 21 and stretch into in 2 bottoms of cushion cap. The top of the pile 1 is provided with a coring hole 11 from top to bottom, the coring hole 11 is coaxial with the pile 1, the supporting tube 4 is fixedly connected with the pile 1, the bottom end of the supporting tube 4 is positioned in the coring hole 11, and the top end of the supporting tube 4 is positioned above the cushion layer 21. Gravels are filled in the core taking hole 11, the peripheral wall of the supporting pipe 4 is provided with a pulp flowing hole 41, a pulp flowing self-flowing hole 41 in concrete of the bearing platform 2 firstly enters the supporting pipe 4, and then the pulp flowing and the gravels are gelled to form a gravel layer. When the concrete of the bearing platform 2 is poured, the core taking hole 11 is blocked, the construction efficiency is improved, the combination times of new concrete and old concrete are reduced, and the connection performance of the pile 1 and the bearing platform 2 is improved.

Referring to fig. 1 and 2, an annular mounting groove 12 is formed in the top wall of the coring hole 11 from top to bottom, and a sealing element 7 is arranged in the mounting groove 12 in a compression sealing manner. Sealing member 7 includes sealing ring 71 and meet water inflation sealing rod, and annular 72 has been seted up to sealing ring 71 perisporium, and the embedded annular meeting water inflation sealing rod that is equipped with of annular 72. The water-swelling sealing rod protrudes out of the annular groove 72, the supporting tube 4 is used to penetrate through the sealing ring 71, the outer wall of the supporting tube 4 abuts against the inner wall of the sealing ring 71, and the part of the water-swelling sealing rod protruding out of the annular groove 72 is extruded into the annular groove 72 under the action of the peripheral wall of the cylindrical plug and the mounting groove 12. The outer walls of the water-swelling water stop strip and the sealing ring 71 are abutted against the peripheral wall of the mounting groove 12, extrusion sealing is achieved, rainwater and sewage are reduced from entering the coring hole 11, and pouring quality is improved.

Meanwhile, the inner wall of the support tube 4 positioned in the coring hole 11 is in threaded connection with a slurry guide tube 46, the peripheral wall of the slurry guide tube 46 is provided with slurry guide holes 461, a plurality of slurry guide holes 461 are uniformly arrayed on the peripheral wall of the slurry guide tube 46, and gravels are distributed between the outer wall of the slurry guide tube 46 and the inner wall of the coring hole 11. The slurry guide hole 461 is convenient for uniformly guiding the slurry of concrete of the bearing platform 2 into the coring hole 11 from top to bottom, and improves the combination of the slurry and gravel so as to improve the forming quality of the gravel slurry layer 5.

The supporting tube 4 perisporium fixedly connected with mounting panel 43, the bolt piece 44 is worn to be equipped with in proper order by mounting panel 43 four corners department, and bolt piece 44 is expansion bolts, and bolt piece 44 penetrates in penetrating the mounting panel 43 earlier and then penetrates stake 1 top, and then with the vertical fixed of supporting tube 4. The top of the sealing ring 71 protrudes out of the top opening of the mounting groove 12, and the mounting plate 43 extrudes the top of the sealing ring 71 to be flush with the top surface of the pile 1 under the action of the bolt piece 44, so that the sealing effect of the sealing element 7 is enhanced.

Referring to fig. 1 and 3, the peripheral wall of the support tube 4 is provided with balancing holes 42, referring to fig. 4, the balancing holes 42 are higher than the flow holes 41, and four balancing

holes

42 and 41 are circumferentially arrayed.

Referring to fig. 1 and 3, the first state refers to a process of pouring concrete of the cap 2, in which the concrete level gradually rises from the cushion layer 21, but the concrete level does not rise to the balance hole 42. 6 top sealing connection of manometer pipe has and takes out pressure equipment 8, takes out the optional vacuum pump of pressure equipment 8, and then forms the negative pressure to manometer pipe 6, stay tube 4 and the intracavity that forms between the coring hole 11, can be fast effectively with the head of flowing in the 2 concrete of cushion cap drainage to the cavity in, and negative pressure environment then can be improved to sealing member 7.

The one end periphery wall that the pressure pipe 6 is located in the stay tube 4 has seted up annular seal groove 61, and seal cover 62 is equipped with to the cover in the seal groove 61, and seal cover 62 is the rubber material, and seal cover 62 protrusion seal groove 61 to seal cover 62 and the interference fit of the 4 inner walls of stay tube. Simultaneously, the seal cover 62 top is less than balance hole 42 and the seal cover 62 bottom is higher than head hole 41, and then makes seal cover 62 further improve negative pressure environment to and pressure pipe 6 carries out interference fit through

seal cover

62 and 4 inner walls of stay tube, can realize that pressure pipe 6 is along 4 axial displacement of stay tube, conveniently utilizes the surveyor's level to confirm the elevation of pressure pipe 6 top, and then the determination of the 2 top surface elevations of auxiliary positioning cushion cap.

Referring to fig. 5, the balance holes 42 are located in the platform 2, and the top of the support tube 4 is located above the top of the platform 2. The second state is that the concrete level of the bearing platform 2 is higher than the bottom of the balance hole 42, and the concrete level of the bearing platform 2 gradually rises in the process. The top end of the pressure pipe 6 in the process is hermetically connected with a grouting device 9, the grouting device 9 can select a high-pressure grouting machine, and then concrete slurry filled in a cavity formed among the pressure pipe 6, the supporting pipe 4 and the coring hole 11 is pressurized and fixed, so that the quality of a gravel layer is further improved, and the connection performance between the pile 1 and the bearing platform 2 is further improved.

Referring to fig. 6, a bottom plate 3 is poured on the top of the bearing platform 2, the top of the support tube 4 is located in the bottom plate 3, and the top of the pressure tube 6 is the same as the top of the bottom plate 3 in height, and the state three means the process from the beginning to the end of the pouring of the concrete of the bottom plate 3. Because the pressure pipe 6 can generate axial displacement relative to the supporting pipe 4, the elevation of the surface of the poured bottom plate 3 can be conveniently and directly determined by using a level gauge, and the elevation of the top of the bearing platform 2 can be determined accordingly, so that the flatness of the bottom plate 3 is improved.

The implementation principle of the embodiment of the application is as follows:

the slurry flow of the concrete of the bearing platform 2 and the gravels in the coring holes 11 are gelled to form a gravel layer, so that the combination times of new and old concrete are reduced, and the connection performance between the pile 1 and the bearing platform 2 is improved. The concrete slurry of the reinforced bearing platform 2 enters the coring hole 11 by utilizing the pumping equipment 8, the functions of the slurry and gravels are reinforced, and the pressure pipe 6, the support pipe 4 and the gravel slurry layer 5 in the coring hole 11 are pressurized and fixed by utilizing the grouting equipment 9, so that the forming quality of the gravel slurry layer 5 is further improved, and the connection performance between the pile 1 and the bearing platform 2 is finally improved.

The embodiment of the application discloses a construction method of a pile cap 2 and pile 1 foundation connecting structure, which comprises the following steps with reference to fig. 1 and 2:

s1, a drilling machine is in place, a coring hole 11 is formed, the coring hole 11 is cleaned, a slurry guide pipe 46 is placed in the coring hole 11, and then gravel is filled between the outer wall of the slurry guide pipe 46 and the inner wall of the coring hole 11;

s2, sealing the mounting groove 12 by using a sealing ring 71 and a water-swelling water stop bar, and sealing the inner opening of the mounting ring by using a cylindrical plug;

s3, breaking the pile 1 by using an air pick, leveling the working surface, pouring a cushion layer 21, straightening exposed vertical ribs of the pile 1, and building a brick bed of the bearing platform 2;

s4, hoisting the reinforcement cage of the placement bearing platform 2, taking out the cylindrical plug temporarily plugging the mounting ring, and vertically lowering the support pipe 4 and connecting the support pipe with the top of the slurry guide pipe 46 in a threaded manner;

s5, the mounting plate 43 compresses the top of the sealing ring 71, the mounting plate 43 is fixed to the top of the pile 1 through the bolt piece 44, and the outer peripheral wall of the supporting pipe 4 and a reinforcement cage of the bearing platform 2 are welded and reinforced from bottom to top;

s6, referring to FIG. 6, laying the reinforcing steel bars of the bottom plate 3, and welding and fixing the reinforcing steel bars of the bottom plate 3 with the peripheral wall of the tube;

s7, the sealing sleeve 62 is sleeved in the sealing groove 61, the pressure pipe 6 enters the supporting pipe 4 through the sealing sleeve 62, and the pressure pipe 6 can be axially adjusted due to interference fit among the sealing sleeve 62, the sealing groove 61 and the inner wall of the supporting pipe 4;

s8, utilizing a level gauge and adjusting the elevation of the top of the pressure pipe 6 to enable the pressure pipe 6 to be level with the surface of the bottom plate 3 after pouring is finished;

s9, with reference to FIG. 1, pouring concrete in a bearing platform 2, starting a pressure pumping device 8, forming a negative pressure chamber among a pressure pipe 6, a support pipe 4 and an inner wall of a coring hole 11 under the action among a sealing sleeve 62, the pressure pipe 6 and the support pipe 4 and the action among the support pipe 4, a sealing ring 71 and a water-swelling water stop strip, and enabling concrete flow of the bearing platform 2 to conveniently enter the coring hole 11 from a flow hole 41 quickly;

s10, referring to FIG. 5, after the bearing platform 2 is poured, the pumping equipment 8 is replaced by grouting equipment 9, and concrete pulp and gravels in a cavity formed among the pressure pipe 6, the support pipe 4 and the inner wall of the coring hole 11 are pressurized and kept solid, so that the forming quality of a gravel layer is improved;

s11, referring to fig. 5 and 6, after pressurization and solid retention, the grouting equipment 9 is suspended, the concrete of the bottom plate 3 is poured, and the pouring is stopped until the concrete liquid level of the bottom plate 3 is consistent with the top of the pressure pipe 6;

and S12, starting the grouting equipment 9 again, and performing secondary pressurization and solid retention on concrete pulp and gravel in a cavity formed among the pressure pipe 6, the support pipe 4 and the inner wall of the coring hole 11.

firstly, pumping pressure by using a pumping pressure device 8, accelerating concrete flow of the bearing platform 2 to enter the coring hole 11, then pressurizing and retaining concrete flow and gravels in a cavity formed among the pressure pipe 6, the supporting pipe 4 and the inner wall of the coring hole 11 by using a grouting pressure device 9, and effectively improving the forming quality of a gravel layer by vibration transmission in the concrete pouring process due to the fact that the supporting pipe 4 is welded with the reinforcing cage of the bearing platform 2 and the reinforcing steel bar of the bottom plate 3, and finally improving the connection performance between the pile 1 and the bearing platform 2.

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

1. The utility model provides a cushion cap and pile foundation connection structure which characterized in that: it comprises the following steps:

the pile comprises a pile (1), wherein the top of the pile (1) is provided with a coring hole (11);

the top of the pile (1) is positioned in the bottom of the bearing platform (2);

the supporting pipe (4), the supporting pipe (4) is embedded in the bearing platform (2), the supporting pipe (4) is aligned with the coring hole (11) and fixedly arranged at the top of the pile (1), and the circumferential wall of the supporting pipe (4) is provided with a grout flowing hole (41);

a gravel slurry layer (5), wherein the core hole (11) and the pulp flow hole (41) are filled with the gravel slurry layer (5);

the supporting tube (4) is connected with a pressure tube (6) in a lifting way;

the top of the bearing platform (2) is provided with a bottom plate (3), one end of the pressure pipe (6) is positioned in the bearing platform (2), and the other end of the pressure pipe (6) is not lower than the top surface of the bottom plate (3);

an installation plate (43) penetrates through the bottom of the support tube (4), a bolt piece (44) penetrates through the installation plate (43), and the bolt piece (44) fixes the installation plate (43) on the top of the pile (1);

an installation groove (12) is formed in the inner top wall of the coring hole (11), a sealing element (7) is arranged in the installation groove (12), and the sealing element (7) abuts against the bottom of the installation plate (43);

the sealing element (7) comprises a sealing ring (71), the inner wall of the sealing ring (71) is abutted against the supporting tube (4), an annular groove (72) is formed in the peripheral wall of the sealing ring (71), a water-swelling water stop strip is embedded in the annular groove (72), and the peripheral wall of the water-swelling water stop strip, which is positioned outside the annular groove (72), is abutted against the inner wall of the mounting groove (12);

annular seal groove (61) have been seted up to pressure pipe (6) perisporium, seal cover (62) are equipped with to seal groove (61) endotheca, seal cover (62) outer wall and stay tube (4) inner wall interference fit.

2. The connecting structure of the bearing platform and the pile foundation as claimed in claim 1, wherein: the circumferential wall of the supporting tube (4) above the sealing sleeve (62) is provided with a balance hole (42).

3. A construction method of a pile cap and pile foundation connecting structure according to any one of claims 1 to 2, wherein: the method comprises the following steps:

s1, a drilling machine is in place, a core hole is formed, and gravels in the same level as the pile (1) are filled in the core hole;

s2, the pneumatic pick is in place, the head of the pile (1) is broken, a cushion layer (21) of the bearing platform (2) is poured, and a brick moulding bed of the bearing platform (2) is built;

s3, fixedly installing the bottom of the supporting tube (4) at the top of the pile (1), and hoisting a reinforcement cage of the bearing platform (2);

s4, pouring concrete of the bearing platform (2), and filling the coring holes (11) with grout in the concrete through the grout flowing holes (41);

and S5, finally solidifying the concrete pulp flow and the gravels of the bearing platform (2) in the coring hole (11) to form a gravel slurry layer (5).