CN211973481U

CN211973481U - Anchor rod supporting structure of grouting miniature pile

Info

Publication number: CN211973481U
Application number: CN202020173899.8U
Authority: CN
Inventors: 余巍; 崔招娣; 沈荣峰; 杨波
Original assignee: Nanjing Seu Geotechnical Engineering Investigation And Design Research Institute Co ltd
Current assignee: Nanjing Seu Geotechnical Engineering Investigation And Design Research Institute Co ltd
Priority date: 2020-02-14
Filing date: 2020-02-14
Publication date: 2020-11-20
Anticipated expiration: 2030-02-14

Abstract

The utility model discloses a stock supporting construction of miniature stake of slip casting, including the stake hole of vertical extension, be equipped with the steel pipe in the stake hole, it has the filling layer to fill between stake downthehole wall and the steel pipe, and stake hole top is equipped with guan liang, guan liang includes the reinforcing bar and pours at the outside concrete piece of reinforcing bar, wears to be equipped with the stock on guanliang, and the stock inclines to extend in the foundation ditch, and the parcel has the slip casting body on the stock. The structure combines the grouting micro pile with the anchor rod, can solve the problem of deformation and displacement, is safe and applicable, is convenient to construct, is recyclable and has low cost.

Description

Anchor rod supporting structure of grouting miniature pile

Technical Field

The utility model relates to an underground works technical field, concretely relates to stock supporting construction of miniature stake of slip casting.

Background

Common support forms for foundation pit support in underground space engineering include: the method comprises the following steps of slope setting, cast-in-place pile row pile, steel sheet pile, underground continuous wall, cement-soil gravity type retaining wall, soil nail wall, reinforced concrete sheet pile and the like, and different support forms are suitable for different surrounding environmental constraints and geological conditions.

The micro pile is a cast-in-place pile with a diameter smaller than 400mm and a length-to-thickness ratio larger than 30, and is completed by adopting a drilling, steel pipe inserting and grouting construction process. The micro-pile has the following main characteristics: the construction machinery is small, and is suitable for vertical supporting conditions with small space and higher rigidity requirement; the construction vibration and the noise are small, the interference to the surrounding environment is small, and the method is suitable for the conditions that the urban population is dense and the surrounding environment is harsh; the material turnover efficiency is high, the cost can be greatly saved by recycling steel, and the construction period is greatly shortened.

The micro pile is widely used in soft soil foundation reinforcement engineering and slope anti-slip protection engineering, however, under the conditions of large deep foundation pit area and deep excavation depth in foundation pit supporting engineering, the supporting pile is difficult to provide stable anchoring force, and the cost of applying the inner support is high. And under the condition that the construction space is limited due to the fact that the height of the soil slope is large or no slope space exists, the supporting problem of the deep foundation pit is difficult to solve, and the deep foundation pit is easy to deform and shift.

Disclosure of Invention

For overcoming the not enough of prior art, the utility model provides a little stake of slip casting's stock supporting construction combines together the little stake of slip casting and stock, can solve the problem that warp the aversion.

In order to achieve the purpose, the utility model discloses a stock supporting construction of miniature stake of slip casting, including the stake hole of vertical extension, be equipped with the steel pipe in the stake hole, it has the filling layer to fill between stake downthehole wall and the steel pipe, and stake hole top is equipped with the hat roof beam, and the hat roof beam includes the reinforcing bar and pours at the outside concrete piece of reinforcing bar, wears to be equipped with the stock on the hat roof beam, and the stock inclines to extend in the foundation ditch, and the parcel has the slip casting body on the stock.

Further, the crown beam has a concrete block strength rating of C30.

Further, the horizontal inclination angle of the anchor rod is 15-30 degrees.

Furthermore, the vertical deviation of the pile hole is less than 1/300, and the pile position deviation of the pile hole on the horizontal plane is less than or equal to 10 mm.

Further, the diameter of the steel pipe was 194mm, and the wall thickness of the steel pipe was 5 mm.

Furthermore, the filling layer adopts graded fine aggregate concrete.

Further, the anchor rod adopts steel bars or steel strands.

Further, the grouting body is made of high-strength mortar.

Further, the thickness of the sediment at the bottom of the hole in the pile hole is less than 200 mm.

The utility model discloses a little stake of slip casting's stock supporting construction combines together the little stake of slip casting and stock, can solve the problem that warp the aversion to safe being suitable for, convenient construction, recoverable, it is with low costs.

Drawings

The invention will be further described and illustrated with reference to the accompanying drawings.

Fig. 1 is a schematic structural view of the whole anchor supporting structure of the grouting micro pile according to the preferred embodiment of the present invention.

Reference numerals: 1. a crown beam; 2. a steel pipe; 3. a filling layer; 4. an anchor rod; 5. grouting; 6. pile hole.

Detailed Description

The technical solution of the present invention will be more clearly and completely explained by the description of the preferred embodiments of the present invention with reference to the accompanying drawings.

As shown in fig. 1, the present invention relates to a support structure for an anchor rod 4 of a grouting micro pile, which includes a vertically extending pile hole 6. The pile hole 6 is drilled, the vertical deviation of the pile hole 6 is within 1/300, and the pile position deviation is within 10 mm. Meanwhile, the pile diameter deviation is reduced as much as possible by ensuring the stability of the hole wall of the formed hole so as to meet the requirement of construction on the hole position deviation, and therefore the normal construction of the foundation slab and the structural outer wall after the foundation slab is excavated to the substrate is ensured.

As shown in FIG. 1, a steel pipe 2 is installed in the pile hole 6, the diameter of the steel pipe 2 is 194mm, and the wall thickness of the steel pipe 2 is 5 mm. And a filling layer 3 is filled between the inner wall of the pile hole and the steel pipe 2, and the filling layer 3 is made of graded fine aggregate concrete. Before filling the filling layer 3, the thickness of the bottom sediment in the pile hole 6 needs to be controlled within 200 mm.

As shown in fig. 1, a crown beam 1 is arranged at the top of the pile hole 6, the crown beam 1 comprises reinforcing steel bars and concrete blocks poured outside the reinforcing steel bars, and the strength grade of the concrete blocks of the crown beam 1 is C30, so as to ensure the integrity of the pile body.

As shown in figure 1, holes are drilled in the crown beam 1, deviation of a drilling vacancy is smaller than 50mm, deviation of a drilling inclination angle is smaller than 3 degrees, anchor rods 4 penetrate through the holes, and the anchor rods 4 are made of steel bars or steel strands. The horizontal inclination angle of the anchor rods 4 is 15-30 degrees, and the anchor rods 4 extend in the foundation pit in an inclined mode.

As shown in figure 1, the anchor rod 4 is wrapped with a grouting body 5, the grouting body 5 adopts high-strength mortar, wherein the water cement ratio of the cement mortar is 0.4, the sand-lime ratio is 0.6, and the mixing sand selects medium coarse sand.

The utility model discloses a 4 supporting construction of stock of miniature stake of slip casting have following characteristics: the construction is convenient, and the mechanical construction problem of deep foundation pit support in a small space is solved; the cost is saved, the steel pipe 2 can be pulled out and recovered after the underground structure is finished, and the steel can be repeatedly used; the strength is high, and bending resistance, shearing resistance, resistance to plucking, anchoring force all are all stronger and stable, can satisfy the deformation requirement in the excavation supporting.

The above detailed description merely describes the preferred embodiments of the present invention and does not limit the scope of the present invention. Without departing from the design concept and spirit scope of the present invention, the ordinary skilled in the art should belong to the protection scope of the present invention according to the present invention provides the text description and drawings to the various modifications, replacements and improvements made by the technical solution of the present invention. The scope of protection of the present invention is determined by the claims.

Claims

1. The utility model provides a stock supporting construction of miniature stake of slip casting, its characterized in that, including the stake hole of vertical extension, be equipped with the steel pipe in the stake hole, it has the filling layer to fill between stake downthehole wall and the steel pipe, stake hole top is equipped with the hat roof beam, the hat roof beam includes the reinforcing bar and pours the outside concrete block of reinforcing bar, wear to be equipped with the stock on the hat roof beam, the stock inclines to extend in the foundation ditch, the parcel has the slip casting body on the stock.

2. The bolting configuration for grouting micro-piles according to claim 1, wherein said crown beam has a concrete block strength rating of C30.

3. The bolting configuration for grouting micro-piles according to claim 1, wherein said horizontal inclination of said bolts is 15 ° to 30 °.

4. The bolting structure of a grouting micro pile according to claim 1, wherein the vertical deviation of the pile hole is less than 1/300, and the pile position deviation of the pile hole in the horizontal plane is less than or equal to 10 mm.

5. The bolting configuration for grouting micro-piles according to claim 1, wherein said steel pipes have a diameter of 194mm and a wall thickness of 5 mm.

6. The grouting micro-pile bolting configuration according to claim 1, wherein said filling layer is graded fine-stone concrete.

7. The bolting configuration for grouting micro-piles according to claim 1, wherein said bolts are steel bars or steel strands.

8. The bolting configuration for grouting micropiles according to claim 1, wherein said grout is high strength mortar.

9. The bolting configuration for a grouted micropile according to claim 1, wherein the bottom of the hole is less than 200mm thick.