CN219315690U - Drilling of major diameter precast pile is righting structure in advance - Google Patents
Drilling of major diameter precast pile is righting structure in advance Download PDFInfo
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- CN219315690U CN219315690U CN202320795962.5U CN202320795962U CN219315690U CN 219315690 U CN219315690 U CN 219315690U CN 202320795962 U CN202320795962 U CN 202320795962U CN 219315690 U CN219315690 U CN 219315690U
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Abstract
The utility model discloses a large-diameter precast pile drilling pre-centralizing structure, which comprises a retaining wall pile hole arranged at the outer circle edge of a center column drilling, wherein thick-wall steel pipes are arranged in the retaining wall pile hole, and a connecting structure is arranged between the thick-wall steel pipes; geotechnical bags and filling materials are arranged in gaps between the thick-wall steel pipes and the retaining wall pile holes, and vibrating rods are arranged in one or more geotechnical bags; a plurality of thick-wall steel pipes are formed into arc shapes and are arranged on soft soil on the opposite side of the deviated rock; the upper part of the middle upright post drilling hole is provided with a protective barrel. The utility model has the advantages that: the thick-wall steel pipe which is lowered in the retaining wall pile hole can provide stable radial constraint for drilling of the drill bit, if the drill bit deflects, the thick-wall steel pipe can play a role of a guide rail to correct the deflected drill bit, and therefore deflection of the center column drilling hole is effectively controlled.
Description
Technical Field
The utility model relates to the field of buildings, in particular to a drilling support structure for a large pile hole.
Background
Along with the rapid development of the construction of underground space of national cities, subways are becoming the best choice for public transportation instead of urban road surfaces, but are inevitably limited by the existing operation facilities of surface cities in the subway construction process. The main subway station construction method at present is a framing cover excavation reverse operation station, and the construction of the middle upright post and the guard post becomes a serious problem affecting the subsequent section through and the lap joint of the laminate of the whole station. In particular to a middle vertical column for bearing the main load of a subway platform, the diameter of the middle vertical column can reach up to or down to 2 meters, the length of the middle vertical column is generally more than 30 meters, geological conditions below a foundation pit are different, and one part below the middle vertical column is soft soil and the other part is rock bias; when the middle column hole is constructed, the interface under the projection surface of the middle column hole can lead the drill bit to deflect towards one side with weaker radial constraint, especially the interface is more than the middle part of the pile body and even more than 1/3 of the pile depth, once the deflection drill bit is generated, the drill bit can gradually and cumulatively extend along the deflection angle and is very difficult to correct.
Disclosure of Invention
In order to solve the technical problems, the utility model aims to provide a large-diameter precast pile drilling pre-centering structure, which comprises a wall-protecting pile hole arranged at the outer circle edge of a center column drilling, wherein a thick-wall steel pipe is arranged in the wall-protecting pile hole and is tangent with the edge of the center column drilling; a connecting structure is arranged between the thick-wall steel pipes; geotechnical bags and filling materials are arranged in gaps between the thick-wall steel pipes and the retaining wall pile holes, and vibrating rods are arranged in one or more geotechnical bags; a plurality of thick-wall steel pipes are formed into arc shapes and are arranged on soft soil on the opposite side of the deviated rock; the upper part of the middle upright post drilling hole is provided with a protective barrel.
The connecting structure comprises hooks arranged on the outer sides of the thick-wall steel pipes, the positions of the hooks of the adjacent thick-wall steel pipes correspond to each other, and a connecting ring is sleeved between the two hooks.
And overlapping parts are arranged between the adjacent retaining wall pile holes, and the connecting structure is arranged at the overlapping parts.
The vibrating rod is connected with a driving device arranged outside the center column drilling hole.
The top end of the thick-wall steel pipe is the same as the depth of the lower end of the protective cylinder.
The utility model has the advantages that: the thick-wall steel pipe which is lowered in the retaining wall pile hole can provide stable radial constraint for drilling of the drill bit, if the drill bit deflects, the thick-wall steel pipe can play a role of a guide rail to correct the deflected drill bit, and therefore deflection of the center column drilling hole is effectively controlled.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a cross-sectional view of FIG. 1;
FIG. 3 is a schematic illustration of a connection structure;
in the figure, 1 is a center column drilling hole, 2 is a retaining wall pile hole, 3 is a thick-wall steel pipe, 4 is a geotechnical bag, 7 is a rock bias, 8 is soft soil, 9 is a exploration hole, 21 is a superposition part, 31 is a hook, 32 is a connecting ring, 12 is a driving device, 13 is a retaining cylinder, 14 is the ground, and 15 is a vibrating rod.
Detailed Description
The utility model is specifically described below with reference to the accompanying drawings, and as shown in the drawings, the utility model comprises a retaining wall pile hole 2 arranged at the outer circle edge of a center column drilling hole 1, wherein a thick-wall steel pipe 3 is arranged in the retaining wall pile hole, and the thick-wall steel pipe is tangent to the edge of the center column drilling hole; a connecting structure is arranged between the thick-wall steel pipes; the geotechnical bags 4 and filling materials are arranged in gaps between the thick-wall steel pipes and the retaining wall pile holes, and the vibrating rods 15 are arranged in one or more geotechnical bags; the thick-wall steel pipes are arranged on soft soil 8 on the opposite side of the biased rock 7 in an arc shape; the upper part of the center pillar drill hole is provided with a protective cylinder 13.
As shown in fig. 3, the connection structure includes hooks 31 disposed on the outer side of the thick-wall steel pipe, and the positions of the hooks of the adjacent thick-wall steel pipes correspond to each other, and a connection ring 32 is sleeved between the two hooks.
The connecting structure is not limited to the above-mentioned form, and adjacent thick-wall steel pipes can be connected into a whole in a binding form; or inserting an n-shaped bolt into the adjacent thick-wall steel pipes to connect the two adjacent thick-wall steel pipes into a whole;
preferably, overlapping portions 21 are arranged between adjacent retaining wall pile holes, and the connecting structure is arranged at the overlapping portions.
In order to ensure the compactness of the geotechnical bags and the filling materials and to provide better radial support for the thick-wall steel pipes, the vibrating rod is connected with a driving device arranged outside the center column drill hole. The driving device can adopt an electric or pneumatic mode, and electric or high-pressure gas is utilized to drive the vibration rod to vibrate, so that the purpose of compacting the filling material is achieved.
In order to better link up the drilling, the top of thick-wall steel pipe is the same with the lower extreme degree of depth of pile casing.
The construction method of the utility model comprises the following steps:
(1) Special investigation of middle column:
drilling a prospecting hole 9 at the edge of the position of a preset center column drilling hole 1, and determining the intersection and penetration trend of the partial rock and the projection of the center column drilling hole 1;
(2) Jumping a retaining wall pile hole at the outer edge of the middle vertical column drilling hole on the opposite side of the deviated rock to 7 depths of the deviated rock; then a thick-wall steel pipe 3 is put down in the wall-protecting pile hole 2 after the jump is finished; the "jump" here means that the holes are drilled at intervals, i.e. after one retaining pile hole is drilled, the next retaining pile hole is drilled at intervals, which has the advantage of preventing the soft soil layer from collapsing, and the retaining pile holes at intervals are drilled by using the support of the thick-wall steel pipes arranged in the drilled holes.
(3) Drilling a wall-protecting pile hole at the jump interval, and lowering a thick-wall steel pipe after drilling is completed; the drilled retaining wall pile hole drilled later and the retaining wall pile hole jumped in the step (2) are provided with an overlapping part 21;
(4) As shown in fig. 3, inclined hooks 31 are arranged at the side parts of the thick-wall steel pipes, hooks of adjacent thick-wall steel pipes are rotated to the overlapping parts, the hooks of the adjacent thick-wall steel pipes are guaranteed to correspond to each other, connecting rings 32 are hung between the hooks of the adjacent thick-wall steel pipes, and the connecting rings naturally fall to the lowest position under the action of gravity, so that the adjacent thick-wall steel pipes are connected into a whole;
(5) Filling geotechnical bags 4 and fine sand in gaps between the thick-wall steel pipes and the retaining wall pile holes, and vibrating for compaction; the vibration compacting method comprises the following steps: the vibrating heads are arranged in a plurality of geotechnical bags surrounding the thick-wall steel pipes and are connected with a driving device on the ground. The vibrating head can be driven in a pneumatic or electric mode, and commercially available products can be adopted.
The geotechnical bags are strip bags with smaller diameters and larger lengths, and fine sand is arranged in the geotechnical bags;
(6) Drilling a central column and following the pile casing;
(7) Constructing a middle column;
(8) And recovering auxiliary equipment outside the center column drilling hole.
Claims (5)
1. A major diameter precast pile drilling is righting structure in advance, its characterized in that: the wall protection pile hole is arranged at the outer circle edge of the center column drilling hole, a thick-wall steel pipe is arranged in the wall protection pile hole, and the thick-wall steel pipe is tangent to the edge of the center column drilling hole; a connecting structure is arranged between the thick-wall steel pipes; geotechnical bags and filling materials are arranged in gaps between the thick-wall steel pipes and the retaining wall pile holes, and vibrating rods are arranged in one or more geotechnical bags; a plurality of thick-wall steel pipes are formed into arc shapes and are arranged on soft soil on the opposite side of the deviated rock; the upper part of the middle upright post drilling hole is provided with a protective barrel.
2. The large-diameter precast pile drilling pre-centralizing structure according to claim 1, wherein: the connecting structure comprises hooks arranged on the outer sides of the thick-wall steel pipes, the positions of the hooks of the adjacent thick-wall steel pipes correspond to each other, and a connecting ring is sleeved between the two hooks.
3. The large-diameter precast pile drilling pre-centralizing structure according to claim 1, wherein: and overlapping parts are arranged between the adjacent retaining wall pile holes, and the connecting structure is arranged at the overlapping parts.
4. The large-diameter precast pile drilling pre-centralizing structure according to claim 1, wherein: the vibrating rod is connected with a driving device arranged outside the center column drilling hole.
5. The large-diameter precast pile drilling pre-centralizing structure according to claim 1, wherein: the top end of the thick-wall steel pipe is the same as the depth of the lower end of the protective cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320795962.5U CN219315690U (en) | 2023-04-12 | 2023-04-12 | Drilling of major diameter precast pile is righting structure in advance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320795962.5U CN219315690U (en) | 2023-04-12 | 2023-04-12 | Drilling of major diameter precast pile is righting structure in advance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219315690U true CN219315690U (en) | 2023-07-07 |
Family
ID=87003523
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320795962.5U Active CN219315690U (en) | 2023-04-12 | 2023-04-12 | Drilling of major diameter precast pile is righting structure in advance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219315690U (en) |
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2023
- 2023-04-12 CN CN202320795962.5U patent/CN219315690U/en active Active
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