CN215105479U - Foundation rock anchor pile plate type foundation of tower crane - Google Patents

Abstract

The utility model discloses a tower crane bedrock anchor pile plate type foundation, which comprises a plate type foundation, a cushion layer, a bedrock surface, an anchor pile hole, an anchor pile main rib, a fixing rib and a cement mortar concretion body; a cushion layer is arranged between the bottom surface of the plate type foundation and the bed rock surface; 4 anchor pile holes are drilled in bedrock at the bottom of the cushion layer; anchor pile main ribs are placed in the anchor pile holes; the anchor pile main reinforcement is firmly bound by the fixing reinforcement; the upper ends of the anchor pile main reinforcements are anchored into the plate type foundation; and M30 cement mortar is injected into the anchor pile hole to form a cement mortar concretion body, and the cement mortar concretion body and the anchor pile main reinforcement form the anchor pile together. The utility model discloses set up the anchor pile in the basement rock, make full use of the good resistance to plucking performance of basement rock, improved tower crane's antidumping ability greatly, reduced the volume of plate foundation simultaneously, reduced the excavation volume of material quantity and earth and rockfill, comprehensive cost reduces more than 40%, is fit for popularizing and applying.

Description

Foundation rock anchor pile plate type foundation of tower crane

Technical Field

The utility model belongs to the technical field of the architectural equipment basis, concretely relates to tower crane basement rock anchor sheet formula basis.

Background

At present, the building industry in China is rapidly developed, more and more high-rise buildings are provided, hoisting equipment for hoisting building materials in building engineering is also diversified in types, and among the hoisting equipment, the tower crane is most widely used. Common foundation types of the tower crane include a lattice concrete bearing platform foundation, a pile bearing platform foundation, a plate foundation, a cross foundation and the like according to the geological condition and project characteristics of the project in which the tower crane is located.

For the rock foundation, the prior tower crane generally adopts a plate foundation mostly. In order to prevent the tower crane from overturning, the size of the plate type foundation is usually made larger, the size of the tower crane foundation is generally more than 5m multiplied by 1.2m, the plane size of the large tower crane foundation even reaches more than 7.5m multiplied by 1.7m, a quite large space is occupied, the excavation area of a foundation pit is large, the construction cost is high, and the construction of a building structure is influenced for the tower crane foundation installed in the foundation pit of the building basement. In conclusion, I have designed a tower crane bedrock anchor pile plate type foundation.

Disclosure of Invention

In the rock foundation, in order to prevent that tower crane from toppling, can reduce tower crane basis volume, reduction construction cost again, the utility model provides a tower crane basement rock anchor sheet formula basis.

In order to achieve the above purpose, the utility model adopts the following technical scheme to realize:

a kind of tower crane bedrock anchor pile slab foundation, including slab foundation, bed course, bedrock surface, anchor pile hole, anchor pile main reinforcement, fixed reinforcement and cement mortar concretion body; a cushion layer is arranged between the bottom surface of the plate type foundation and the bed rock surface; 4 anchor pile holes are drilled in bedrock at the bottom of the cushion layer; anchor pile main ribs are placed in the anchor pile holes; the anchor pile main reinforcement is firmly bound by the fixing reinforcement; the upper ends of the anchor pile main reinforcements are anchored into the plate type foundation; and M30 cement mortar is injected into the anchor pile hole to form a cement mortar concretion body, and the cement mortar concretion body and the anchor pile main reinforcement form the anchor pile together.

As a further optimization scheme of the utility model, the plate foundation is poured by reinforced concrete with the reference number of C35, the planar shape is square, the side length is 3.6-5.5 m, and the thickness is 1.25-1.6 m; the cushion layer is cast by C20 plain concrete, and the thickness of the cushion layer is 100 mm.

As a further optimization scheme of the utility model, the anchor pile holes are positioned at four corners of the plate-type foundation, and the distance between the center of the anchor pile hole and the edge of the plate-type foundation is 400-500 mm; the diameter of the anchor pile hole is 180-200 mm, and the depth is 3-7 m.

As a further optimization scheme of the utility model, the anchor pile main reinforcement is made of HRB400 hot-rolled ribbed steel bars with the diameter of 20-25 mm, the lower end of the anchor pile main reinforcement extends into the anchor pile hole and is 50mm away from the hole bottom, the upper end of the anchor pile main reinforcement is anchored into the plate foundation, the anchoring length is not less than 35d (d is the diameter of the steel bar), and the upper end of the anchor pile main reinforcement is bent at the surface of the cushion by 0-15 degrees; the fixed muscle adopts the diameter to make into closed ring for 8 mm's HPB300 round steel, and along anchor pile owner muscle makes into the framework of steel reinforcement from the fixed muscle of bottom every 500mm ligature one.

Compared with the prior art, the beneficial effects of the utility model are that: by arranging the anchor piles in the bedrock, the good uplift resistance of the bedrock can be fully utilized, the anti-overturning capacity of the tower crane is greatly improved, meanwhile, the volume of the plate foundation can be reduced by more than 35%, the excavation amount of earth and stone is reduced, and the comprehensive cost can be reduced by more than 40%. The utility model is suitable for a tower crane of most models on the present building market.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a top view of the overall structure of the present invention;

fig. 3 is a schematic structural view of the anchor pile of the present invention;

fig. 4 is a schematic view of the anchor pile along the line a-a in fig. 3 when 3 anchor pile main reinforcements are provided;

fig. 5 is a schematic view along the line a-a in fig. 3 when the anchor pile is provided with 4 anchor pile main reinforcements.

In the figure: 1. the anchor pile comprises a plate foundation, 2, anchor piles, 3, a cushion layer, 4, a foundation rock surface, 5, a cement mortar concretion body, 6, anchor pile main ribs, 7, fixing ribs, 8 and anchor pile holes.

Detailed Description

The invention will be described in further detail with reference to the following detailed description and accompanying drawings:

referring to fig. 1, 2, 3, 4 and 5, a tower crane bedrock anchor pile slab foundation comprises a slab foundation 1, an anchor pile 2, a cushion layer 3, a bedrock surface 4, a cement mortar concretion body 5, anchor pile main ribs 6, fixing ribs 7 and anchor pile holes 8; a cushion layer 3 is arranged between the bottom surface of the plate foundation 1 and the bed rock surface 4; 4 anchor pile holes 8 are drilled in bedrock at the bottom of the cushion layer 3; anchor pile main reinforcements 6 are placed in the anchor pile holes 8 and are bound and fixed by fixing reinforcements 7; the upper ends of the anchor pile main reinforcements 6 are anchored into the plate type foundation 1; m30 cement mortar is injected into the anchor pile hole 8 to form a cement mortar concretion body 5, and the cement mortar concretion body and the anchor pile main reinforcement 6 form the anchor pile 2 together.

In the utility model, the diameter of the anchor pile hole 8 is 180-200 mm, and the depth in the bedrock is 3-7 m; the position setting of anchor stake hole 8 is in 4 bights of plate foundation 1, and the edge 400 ~ 500mm of center distance plate foundation 1 in anchor stake hole 8.

In the utility model, the anchor pile main reinforcement 6 is made of 3 or 4 HRB400 hot-rolled ribbed steel bars with the diameter of 20-25 mm, the lower end of the anchor pile main reinforcement extends into the anchor pile hole 8 and is 50mm away from the hole bottom, the upper end of the anchor pile main reinforcement is anchored into the plate foundation 1, the anchoring length is not less than 35d (d is the diameter of the steel bar), and the upper end of the anchor pile main reinforcement is bent at the cushion face by 0-15 degrees; and the anchor pile main reinforcement 6 is bound with a fixing reinforcement 7 at intervals of 500mm from the bottom to form a reinforcement cage.

The utility model discloses in, install in anchor pile hole 8 behind anchor pile owner muscle 6 and the 7 ligatures of fixed muscle form the framework of steel reinforcement to adopt high-pressure slip casting machine to pour into M30 cement mortar into in anchor pile hole 8, form cement mortar concretion body 5.

In the utility model, the cushion layer 3 is poured by plain concrete with the reference number of C20, the thickness is 100mm, and the outer edge of the cushion layer 3 extends out of the edge of the plate foundation 1 by 100 mm; the plate type foundation 1 is poured by using reinforced concrete with the reference number of C35, the plane shape of the plate type foundation 1 is square, the side length is 3.6-5.5 m, and the thickness is 1.25-1.6 m.

The utility model discloses in, when confirming the aperture and the degree of depth of bedrock anchor pile hole 8, the quantity and the diameter of anchor pile owner muscle 6 and the size of plate foundation 1, check through following formula (1) and (2):

（1）

（2）

in the formula:N _tmax -the maximum pulling force value to which the anchor pile is subjected;

F _k the self weight of the tower crane in an independent state;

G _k the dead weight of the plate foundation and the dead weight of the soil thereon;

Mthe maximum overturning moment of the tower crane in the non-operating state;

b-the plate-like basis side length;

a-horizontal distance from anchor pile centre to plate foundation edge;

R _t -designing the uplift bearing capacity of the anchor pile main reinforcement;

n-the number of anchor pile main reinforcements;

d-the diameter of the anchor pile main reinforcement;

d ₁ -anchor pile hole diameter;

l-effective anchoring length of anchor pile main reinforcement in bedrock;

f _y -design value of tensile strength of anchor pile main reinforcement;

fcharacteristic value of the bond strength between mortar and rock.

The utility model also provides a construction method of this bedrock anchor pile plate foundation, including following step:

(1) excavating and leveling a bedrock surface 4;

(2) drilling an anchor pile hole 8 by using a small drilling machine, and cleaning sediments at the bottom of the hole after the drilling is finished;

(3) manufacturing anchor pile main reinforcements 6 and fixing reinforcements 7, binding the anchor pile main reinforcements into a reinforcement cage, and then installing the reinforcement cage in anchor pile holes 8;

(4) c30 cement mortar is mixed, and C30 cement mortar is injected into the anchor pile hole 8 by a high-pressure grouting machine;

(5) after cement mortar is coagulated to form a cement mortar concretion body 5, cleaning a bedrock surface 4, and erecting a mold and pouring a cushion layer 3;

(6) and (3) supporting a formwork of the plate foundation 1, binding reinforcing steel bars and pouring concrete.

Claims (4)

1. A kind of tower crane bedrock anchor pile plate foundation, characterized by, including plate foundation, bed course, bedrock surface, anchor pile hole, anchor pile main reinforcement, fixed reinforcement and cement mortar stone body; a cushion layer is arranged between the bottom surface of the plate type foundation and the bed rock surface; 4 anchor pile holes are drilled in bedrock at the bottom of the cushion layer; anchor pile main ribs are placed in the anchor pile holes; the anchor pile main reinforcement is firmly bound by the fixing reinforcement; the upper ends of the anchor pile main reinforcements are anchored into the plate type foundation; and M30 cement mortar is injected into the anchor pile hole to form a cement mortar concretion body, and the cement mortar concretion body and the anchor pile main reinforcement form the anchor pile together.

2. The anchor pile plate foundation for the bedrock of the tower crane according to claim 1, wherein the plate foundation is a reinforced concrete foundation, the planar shape of the plate foundation is a square, the side length of the plate foundation is 3.6-5.5 m, and the thickness of the plate foundation is 1.25-1.6 m.

3. The foundation pile plate foundation of the tower crane bedrock anchor according to claim 1, wherein the anchor pile holes are positioned at four corners of the plate foundation, and the center of each anchor pile hole is 400-500 mm away from the edge of the plate foundation; the diameter of the anchor pile hole is 180-200 mm, and the depth is 3-7 m.

4. The foundation of the tower crane bedrock anchor pile plate type as claimed in claim 1, wherein the anchor pile main reinforcement is made of 3 or 4 HRB400 hot-rolled ribbed steel bars with the diameter of 20-25 mm, and the upper end of the anchor pile main reinforcement is bent; the fixed muscle adopts the diameter to make into the ring for 8 mm's HPB300 round steel, and will anchor pile owner muscle is from the bottom every 500mm ligature one fixed muscle make into the framework of steel reinforcement.

Images