CN215977235U - Grouting reinforcement structure for cast-in-place concrete pile - Google Patents

Abstract

The utility model discloses a grouting reinforcement structure of a concrete cast-in-place pile, which comprises a cast-in-place pile, wherein a plurality of cast-in-place holes are formed in the cast-in-place pile, the cast-in-place holes vertically extend to a supporting rock stratum at the bottom of the cast-in-place pile along the top of the cast-in-place pile, a steel pipe is arranged in each cast-in-place hole, a grouting pipe and an exhaust pipe are arranged in each steel pipe, a sealing plate is arranged at the top end of each steel pipe, each sealing plate is fixedly connected with each steel pipe, a hole is formed in each sealing plate, each grouting pipe and each exhaust pipe penetrate through the hole and are arranged in each steel pipe, and one end of each grouting pipe is connected with a high-pressure grouting pump. The grouting reinforcement structure can clean the sediment at the bottom of the pile to the maximum extent, and meanwhile, secondary grouting can be realized through the grouting reinforcement structure, so that the stability of the pile foundation is further enhanced.

Description

Grouting reinforcement structure for cast-in-place concrete pile

Technical Field

The utility model relates to the technical field of building pile foundation engineering, in particular to a grouting reinforcement structure of a concrete filling pile.

Background

The cast-in-place concrete pile is a pile formed by forming a pile hole in foundation soil through mechanical drilling, steel pipe soil extrusion or manual excavation and the like on an engineering site, placing a reinforcement cage and casting concrete in the pile hole, and the cast-in-place concrete pile can be divided into a sinking pipe cast-in-place pile, a cast-in-place concrete pile and the like according to different hole forming methods. The concrete filling pile hole forming process is often accompanied by links such as slurry circulation (except for a sinking pipe), slurry wall protection, slurry hole cleaning and the like. Because the pile-forming process is completely hidden underground, any condition of underground pile body and pile bottom can not be seen, the hole bottom slag removal can only be implemented by experience and specification, the monitoring is neglected slightly in the construction process, the quality of the pile foundation in the later period can be greatly influenced,

often can appear in later stage pile foundation detection experiment that the bearing capacity of single pile is not enough, the too big transfinite etc. of pile body settlement volume, the defective rate reaches more than 30% (the standard regulation does not exceed 15%), in case these circumstances appear, pile foundation bearing capacity will greatly reduced, brings huge hidden danger for the quality of building. Through on-site core drilling sampling analysis of unqualified pile bodies, the condition that more than 90% of bearing capacity of the pile bodies is insufficient is mainly caused by excessive pile bottom sediment, incomplete hole cleaning and excessive sediment sludge content before pile body concrete is poured. Therefore, the utility model provides a grouting reinforcement structure of the cast-in-place concrete pile aiming at the cast-in-place concrete pile which is detected to be unqualified.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a grouting reinforcement structure of a concrete filling pile, which can be used for cleaning sediment at the bottom of the pile to the maximum extent, and meanwhile, secondary grouting can be realized through the grouting reinforcement structure, so that the stability of a pile foundation is further enhanced. In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a concrete bored concrete pile grout reinforced structure, includes the bored concrete pile, be equipped with the filling hole on the bored concrete pile, the filling hole has a plurality ofly, and this filling hole extends to the pile bottom of bored concrete pile perpendicularly along the bored concrete pile top and holds the power rock stratum, be equipped with the steel pipe in the filling hole, be equipped with slip casting pipe and blast pipe in the steel pipe, the steel pipe top is equipped with the closure plate, this closure plate and steel pipe fixed connection, be equipped with the hole on the closure plate, slip casting pipe and blast pipe run through this hole respectively and set up in the steel pipe, the one end and the high-pressure grouting pump of slip casting pipe are connected.

Furthermore, there are two filling holes, and the filling holes are respectively located on two opposite sides of the filling pile.

Further, the aperture of the perfusion hole is 91 mm.

Further, the length of the grouting pipe is larger than the height of the pouring hole, and the length of the exhaust pipe is 1m-1.2 m.

Further, the grouting pipe and the exhaust pipe are welded at the hole joint of the closing plate, and the height of the welding seam is not less than 10 mm.

Further, the grouting pipe and the exhaust pipe which are positioned at the upper part of the closing plate are provided with sealing structures.

Further, the sealing structure is composed of cement and crushed stone, which are piled up around the grout pipe and the exhaust pipe.

Further, the closing plate comprises a steel plate and a rubber plate, the steel plate and the rubber plate are both circular, the rubber plate is fixedly clamped inside the steel pipe, the top of the rubber plate is fixedly connected with the steel plate, and the steel plate is welded with the steel pipe at the intersection.

Further, the steel plate has a diameter of 91mm and a thickness of 6 mm.

The utility model adopts a high-pressure grouting method treatment technology, namely, a drilling machine is adopted to drill into a pre-treated depth from a pile top along two pore channels (or an original sound wave tube in a pile body), a steel pipe is inserted to the bottom of the pore channel, a high-pressure grouting pump is firstly used for injecting clear water to wash sediment at the bottom, and high-grade cement slurry (containing a micro-expanding agent) is injected at high pressure from the steel pipe which is deep into the bottom of the pile until the water which is blown out from the other pore channel is clear from turbidity. The cement paste and the sediment (which is washed clean and contains no mud) at the bottom of the pile are infiltrated, mixed, hardened and expanded, so that the pile body is cemented with the bearing bedrock at the bottom of the pile, and the purpose of reinforcement is achieved.

In summary, due to the adoption of the technical scheme, the utility model has the following technical effects:

1. the utility model can thoroughly clean the mud residue at the bottom of the cast-in-place pile through arranging the cast-in-place hole on the cast-in-place pile, and can carry out secondary grouting on the gaps of the cast-in-place hole and the cast-in-place pile bottom through matching of the high-pressure grouting pump and the grouting pipe after cleaning, so that the stability of the cast-in-place pile is greatly improved.

2. The utility model seals the orifice of the grouting hole through the closing plate, welds the closing plate at the crossed position of the grouting pipe and the exhaust pipe, and simultaneously arranges the sealing structure at the parts of the grouting pipe and the exhaust pipe positioned at the top end of the closing plate, thereby avoiding the condition of slurry leakage and splashing caused by the untight sealing of the orifice of the grouting hole in the high-pressure grouting process and greatly improving the stability and the safety in the grouting process.

3. The sealing plate comprises a steel plate and a rubber plate, the steel plate is arranged at the top end of the rubber plate, the rubber plate is clamped at an opening in the steel pipe, and the steel plate and the steel pipe are welded at the intersection, so that the sealing performance is improved to the maximum extent, and meanwhile, the rubber plate plays a role in buffering, so that the situation that the pressure which is not timely discharged from the interior of the steel pipe directly acts on the steel plate in the high-pressure grouting process is avoided, the stability in the grouting process is further improved, and the danger in the grouting process is greatly reduced.

4. The utility model has wide application range:

(1) the method is suitable for the construction of the foundation engineering of the bored pile taking the gravel layer as the bearing stratum, in particular to the geological condition that the gravel layer is thick and the bedrock is buried deeply.

(2) The method is suitable for the foundation engineering of the bored pile which takes the bedrock as a bearing stratum and is not completely cleaned due to the limitation of conditions.

(3) The method is suitable for reinforcing cast-in-situ bored piles or manual hole digging pile foundation engineering with thicker sediments found by core inspection.

Drawings

Fig. 1 is a schematic view of a grouting reinforcement structure of a concrete cast-in-place pile according to the present invention;

in the attached drawing, 1-filling pile, 11-filling pile bottom holding force rock stratum, 2-filling hole, 21-steel pipe, 22-grouting pipe, 23-exhaust pipe, 3-sealing plate, 31-steel plate, 32-rubber plate, 4-high pressure grouting pump and 5-sealing structure.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings by way of examples of preferred embodiments. It should be noted, however, that the numerous details set forth in the description are merely for the purpose of providing the reader with a thorough understanding of one or more aspects of the present invention, which may be practiced without these specific details.

In order that those skilled in the art will better understand the technical solution of the present invention, the following detailed description of the present invention is provided in conjunction with the accompanying drawings and the detailed description.

A concrete filling pile grouting reinforcement structure comprises a filling pile 1, wherein a plurality of filling holes 2 are formed in the filling pile 1, the filling holes 2 vertically extend to a pile bottom supporting rock stratum 11 of the filling pile along the top of the filling pile, a steel pipe 21 is arranged in each filling hole 2, a grouting pipe 22 and an exhaust pipe 23 are arranged in each steel pipe 21, a sealing plate 3 is arranged at the top end of each steel pipe 21, the sealing plate 3 is fixedly connected with the steel pipe 21, a hole (not shown in the figure) is formed in each sealing plate 3, the grouting pipe 22 and the exhaust pipe 23 penetrate through the hole (not shown in the figure) and are arranged in each steel pipe 21, and one end of each grouting pipe 22 is connected with a high-pressure grouting pump 4; the number of the pouring holes 2 is two, and the pouring holes 2 are respectively positioned at two opposite sides of the pouring pile 1; the aperture of the filling hole 2 is 91 mm.

In the embodiment, the pouring hole 2 is formed by a 100-type geological drilling machine, the aperture of the pouring hole is 91mm, the hole depth is about to enter the pile bottom holding force rock stratum 11, and the specific depth is based on the depth shown in the detection report. In order to achieve the best reinforcing effect, holes are drilled in opposite directions of two sides of the cast-in-place pile, in the process of cleaning sediment or grouting, a high-pressure grouting pump is connected with a grouting pipe in any one of the cast-in-place holes, the high-pressure grouting pump is detachably connected with the grouting pipe through a high-pressure rubber pipe (not shown in the figure), a valve (not shown in the figure) is further arranged on the high-pressure rubber pipe, the cleaned sediment or redundant slurry is discharged from the other cast-in-place hole, and an exhaust pipe 23 is used for exhausting air in the cast-in-place hole.

The length of the grouting pipe 22 is greater than the height of the pouring hole 2, and the length of the exhaust pipe 23 is 1m-1.2 m; the grout pipe 22 and the exhaust pipe 23 are welded at the joint of the holes (not shown in the drawing) of the closing plate 3, the height of the weld being not less than 10 mm.

The grouting pipe 22 and the exhaust pipe 23 positioned at the upper part of the closing plate 3 are provided with a sealing structure 5; the seal structure 5 includes cement and crushed stone, which are piled up around the grout pipe 22 and the exhaust pipe 23.

The closing plate 3 comprises a steel plate 31 and a rubber plate 32, the steel plate 31 and the rubber plate 32 are both circular, the rubber plate 32 is fixedly clamped inside the steel pipe 21, the top of the rubber plate 32 is fixedly connected with the steel plate 31, and the steel plate 31 is welded with the steel pipe 21 at the intersection. The steel plate 31 had a diameter of 91mm and a thickness of 6 mm. The diameter of the rubber plate 32 is equivalent to that of the steel pipe 21, and the rubber plate 32 is tightly clamped with the inner side of the steel pipe 21.

In this embodiment, steel sheet 31 and steel pipe 21 are in crossing department welding, have guaranteed the leakproofness at the grout in-process, set up rubber slab 32 in steel sheet 31 bottom, the inside opening part at steel pipe 21 is established to rubber slab 32 card, further promotion sealing performance, rubber slab 32 also plays the cushioning effect simultaneously, has avoided in the high pressure grout in-process, the inside not in time discharged pressure direct action of steel pipe on the steel sheet, greatly reduced pour into the danger of thick liquids in-process.

When the utility model is used, firstly, a hole is drilled on a cast-in-place pile 1, in order to achieve the best reinforcing effect, the cast-in-place hole 2 is selected in the opposite direction of two sides of the cast-in-place pile 1, a 100-type geological drilling machine is adopted as the drilling machine, after the drilling is finished, a grouting pipe 22 is placed to the hole bottom of the cast-in-place hole, a high-pressure grouting pump 4 (25-30 MPa) is adopted to inject clean water to clean soil impurities such as the hole bottom, karst cave fillers and sediments and the like, rock debris, residue, muddy water and the like deposited in the hole are discharged from a gap between the outer wall of the grouting pipe and the wall of the cast-in-place pile through the hole, a hole sealing program can be carried out until the hole opening returns water gradually becomes clear from turbid color, a steel pipe 21 is placed in the cast-in-place, corresponding positions of a sealing plate 3 of the steel pipe 21 are provided with holes, the grouting pipe 22 and an exhaust pipe 23 are respectively penetrated through, the sealing plate 3 and the joint of the grouting pipe 22 and the exhaust pipe 23 is fully welded, the height of the welding line is controlled to be not less than 10mm, and must guarantee to weld firmly, set up the sealing mechanism around grouting pipe 22, exhaust pipe 23 on the upper portion of round steel plate at the same time, the seal structure 5 is by high-viscous early-strength cement and a small amount of rubble, and fully tamp and compact and pack, make grouting pipe 22, exhaust pipe 23 squeeze the hole wall after entering the hole tightly, guarantee that the reinforcement liquid does not ooze outward in the course of high-pressure grouting, after the orifice is sealed and finished, after fully stirring and compacting the good grouting material fully, connect the high-pressure rubber pipe with grouting pipe closely before grouting, open the valve during grouting, start the high-pressure grouting pump 4, reach the standard of final pouring and close the valve, dismantle the high-pressure rubber pipe, finish the work of strengthening grouting.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.

Claims (8)

1. The utility model provides a concrete bored concrete pile reinforced structure that is in milk, includes the bored concrete pile, its characterized in that, be equipped with the filling hole on the bored concrete pile, the filling hole has a plurality ofly, and this filling hole extends to the pile base holding power rock stratum of bored concrete pile perpendicularly along bored concrete pile top, be equipped with the steel pipe in the filling hole, be equipped with slip casting pipe and blast pipe in the steel pipe, the steel pipe top is equipped with the closure plate, this closure plate and steel pipe fixed connection, be equipped with the hole on the closure plate, slip casting pipe and blast pipe run through this hole setting respectively in the steel pipe, the one end and the high-pressure grouting pump of slip casting pipe are connected.

2. A concrete pouring pile grouting reinforcement structure according to claim 1, wherein there are two of said pouring holes, and the pouring holes are respectively located at opposite sides of the pouring pile.

3. A concrete pouring pile grouting reinforcement structure as claimed in claim 2, wherein the diameter of said pouring hole is 91 mm.

4. A concrete pouring pile grouting reinforcement structure according to claim 3, wherein the length of the grouting pipe is greater than the height of the pouring hole, and the length of the exhaust pipe is 1m to 1.2 m.

5. A concrete pouring pile grouting reinforcement structure as claimed in claim 4, wherein said grouting pipes and said air discharging pipes are welded at the junctions with said holes of said closing plates, respectively, and the height of the welded seam is not less than 10 mm.

6. A concrete pouring pile grouting reinforcement structure as claimed in claim 5, wherein a sealing structure is provided at the grouting pipe and the exhaust pipe at the upper portion of the closing plate.

7. The grouting reinforcement structure of a concrete pouring pile according to claim 6, wherein the closing plate comprises a steel plate and a rubber plate, the steel plate and the rubber plate are both circular, the rubber plate is fixedly clamped inside the steel pipe, the top of the rubber plate is fixedly connected with the steel plate, and the steel plate and the steel pipe are welded at the intersection.

8. A concrete pouring pile grouting reinforcement structure as claimed in claim 7, wherein said steel plate has a diameter of 91mm and a thickness of 6 mm.

Images