CN212427069U - Partially-bonded prestressed uplift pile with enlarged head - Google Patents

Abstract

The utility model relates to a take partial bonding prestressing force uplift pile of enlarged footing, its characterized in that: the cement protective layer spouts the stirring stake machine soon through long spiral and sets up on preset position, set up one or more enlarged footing on the outside of cement protective layer, the concrete protective layer that pours into in the cement protective layer, the vibrations insert reinforcing bar steel strand wires cage in the concrete protective layer, reinforcing bar steel strand wires cage includes pulling force dispersion type, pressure dispersion type and draws and press combination stress dispersion type, the utility model discloses can cloth the stake less at same bearing capacity, or the reducible pile length of same pile number or pile footpath, not only have the saving of concrete and man-machine expense, simultaneously because efficiency improves, the construction civilization, and advantages such as no mud transportation expense, only the saving that the bearing capacity total cost brought can account for about more than 20%. The life of the buildings on the building is prolonged. The economic benefit is obvious, and the social benefit and the environmental protection benefit are obvious.

Description

Partially-bonded prestressed uplift pile with enlarged head

Technical Field

The utility model relates to a take partial bonding prestressing force uplift pile of enlarged footing.

Background

In electric power, petroleum, communication, traffic facilities and high-rise buildings, pile foundations are often adopted to bear large uplift loads, and typical structures are as follows:

1. underground structures such as underground garages, hangars, basements, docks, pump rooms, ship locks, etc., under which piles are placed, tend to bear large buoyancy forces.

2. Fork pile structures bearing huge horizontal loads, such as wharfs, abutment, batter piles under retaining walls.

3. The tower structure comprises a television tower, a communication tower, a high-rise structure pile foundation such as a high-rise building, a high-voltage transmission line tower foundation, an ocean platform pile foundation and the like.

4. Buildings in special areas, such as pile foundations under earthquake loads, and building pile foundations on expansive and frost-heaving soils.

For the pile foundation bearing the pulling force, the pulling resistance bearing capacity of the pile foundation group and the foundation pile thereof is checked, the tensile bearing capacity of the pile foundation material is checked according to the current concrete structure design specification (GB50010), and when the pile body has the crack resistance requirement, the crack resistance performance is also checked.

Because the pile body concrete is in a tensile state when the uplift pile is stressed, but the strength of the concrete is very low when the uplift pile is stressed in a tensile state, the pile body concrete generally generates cracks under the tensile action when the uplift pile is damaged, the steel skeleton of the pile body begins to be slowly corroded and damaged along with the gradual expansion of the cracks, and then the whole pile body is damaged in a failure mode.

The use of the uplift pile is more and more popular, but the traditional cast-in-situ bored pile is still dominant as the uplift pile so far, and only the stress and action mechanism of the cast-in-situ bored pile are changed. Because in traditional drilling bored concrete pressure-bearing pile, the pile body concrete is the pressurized, and pile body concrete can hardly take place to destroy under the pressurized state, and pile body steel framework also can not produce the destruction. However, once the conventional cast-in-situ bored pile is used as a uplift pile, the pile body concrete is easily damaged under the tensile action, and the pile body steel framework is also damaged along with the damage of the pile body concrete.

In the design of the uplift pile, the side frictional resistance value of the pile is reasonably considered according to the comprehensive conditions of the type of the pile, the construction method, the soil layer property, the soil layer distribution depth and the like, and the bottom frictional resistance of the long pile cannot be fully exerted. The frictional resistance is only in a linear relationship with the pile diameter, and the engineering quantity is in direct proportion to the square of the pile diameter. The load transfer function shows that before the pile body cracks, the frictional resistance is in direct proportion to the upward pulling displacement, and when the pile body cracks, the pile side frictional resistance is not fully exerted, so that in the design of the uplift pile, the anti-cracking performance of the concrete at the upper part of the pile body needs to be strengthened by considering besides the reasonable utilization of the pile side frictional resistance.

The upper pulling force acting point of the pile is arranged at the lower part of the pile, which is beneficial to reducing the maximum value of the axial force of the pile. In engineering applications, it is desirable to locate the uplift force application point of the pile at the lower part of the pile, such as possibly at the pile end. Since the soil around the pile shares a significant part of the load, i.e. provides considerable side friction, the load decays very quickly when it is transferred from the lower part to the upper part of the pile, and the upper part of the pile does not play a significant role. If the load continues to increase, the circumferential friction resistance of the pile at the upper part of the pile can not be obviously increased, so that the part of the pile plays a role in relation to the strength of the rock soil and the side friction resistance provided by the rock soil. When the former is dominant, the exertion of side resistance is facilitated; if the latter is dominant, the shear failure may occur in the rock soil around the pile when the side friction force on the upper part of the uplift pile is not exerted, so that the uplift pile loses the bearing capacity.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a partial bonding prestressing force uplift pile of enlarged head in area can cloth the stake less at same bearing capacity, or the reducible stake of same stake number is long or the stake footpath, not only has the saving of concrete and man-machine expense, simultaneously because efficiency improves, the construction civilization, no advantages such as mud freight, only the bearing capacity improves the saving that brings and can account for the total cost more than about 20%. The life of the buildings on the building is prolonged. The economic benefit is obvious, and the social benefit and the environmental protection benefit are obvious.

In order to realize the purpose, the utility model discloses a technical scheme is:

the utility model provides a partial bonding prestressing force uplift pile of area enlarged footing which characterized in that: the cement soil protective layer spouts the stirring stake machine soon through long spiral and sets up on preset position, set up one or more enlarged footing on the outside of cement soil protective layer, the concrete protective layer is filled in the cement soil protective layer, the reinforcing bar steel strand wires cage is inserted in the vibrations in the concrete protective layer, the reinforcing bar steel strand wires cage includes pulling force dispersion type, pressure dispersion type and draws and press the combination stress dispersion type.

The part of area enlarged footing bonds prestressing force uplift pile, wherein: the reinforcing steel strand wires cage includes main muscle, stirrup and steel strand wires, the main muscle reaches the steel strand wires pass through the stirrup is tied up fixedly into cavity drum type, the top of main muscle sets up in the bottom plate, the bottom of main muscle is V type welded fastening, U type card and bottom plate reinforcing bar fixed connection are passed through to the top of steel strand wires, the upper portion of steel strand wires pass through the anchor head with bottom plate fixed connection, the main muscle reaches the reinforcing ring is led to two at least V types of radial setting of the outer wall of steel strand wires, the main muscle reaches the outer wall of steel strand wires radially sets up a plurality of strengthening rib, the bottom and the middle part and U type card steel strand wires fixed connection of steel strand wires, the top of U type card steel strand wires is the steel strand wires bonding section.

The part of area enlarged footing bonds prestressing force uplift pile, wherein: the steel strand bonding section is provided with a plurality of expanding heads, the number of the expanding heads is one, the distance between every two expanding heads is not less than 6m, and the expanding heads are arranged at the upper and lower positions of the steel strand bonding section by 1m respectively.

The utility model has the advantages that: the pile length or the pile diameter can be reduced under the same bearing capacity, so that not only is concrete and man-machine cost saved, but also the saving caused by only improving the bearing capacity can account for more than 20 percent of the total cost due to the advantages of improving the efficiency, civilizing the construction, avoiding the mud transportation cost and the like. The life of the buildings on the building is prolonged. The economic benefit is obvious, and the social benefit and the environmental protection benefit are obvious.

Drawings

Fig. 1 is a structural view of a partially bonded prestressed uplift pile with an enlarged head.

Fig. 2 is a structural view of an embodiment of a partially bonded prestressed uplift pile with an enlarged head.

Fig. 3 is a structural view of another embodiment of a partially bonded prestressed uplift pile with an enlarged head.

Fig. 4 is a top view structural view of the partially bonded prestressed uplift pile with the enlarged head.

Fig. 5 is a flow chart of a partially bonded prestressed uplift pile with an enlarged head.

Description of reference numerals: 1-main reinforcement; 2-reinforcing ribs; 3-V type leads positive reinforcement circle; 4-stirrup; 5-concrete protective layer; 6-a cement soil protective layer; 7-an enlarged head; 8-steel strand wires; 9-anchor head; 10-a base plate; 11-steel strand bonding section; 12-floor rebar; 13-U type card; 14-U type kayak steel strand.

Detailed Description

As shown in fig. 1 to 5, a partially bonded prestressed uplift pile with an enlarged head is characterized in that: cement protection layer 6 spouts the stirring stake machine soon through long spiral and sets up on preset position, set up one or more enlarged footing 7 on cement protection layer 6's the outside, pour concrete protection layer 5 in the cement protection layer 6, the reinforcing bar steel strand wires cage is inserted in the vibrations in the concrete protection layer 5, the reinforcing bar steel strand wires cage includes pulling force dispersion type, pressure dispersion type and draws and press the combination stress dispersion type.

The reinforcing steel strand cage includes main muscle 1, stirrup 4 and steel strand wires 8, main muscle 1 reaches steel strand wires 8 pass through stirrup 4 is tied up and is fixed into the hollow cylinder type, the top of main muscle 1 sets up in bottom plate 10, the bottom of main muscle 1 is V type welded fastening, U type card 13 and 12 fixed connection of bottom plate reinforcing bar are passed through to steel strand wires 8's top, anchor head 9 is passed through on steel strand wires 8's upper portion with bottom plate 10 fixed connection, main muscle 1 reaches reinforcing ring 3 is led to at least two V types of radial setting up of steel strand wires 8's outer wall, main muscle 1 reaches steel strand wires 8's outer wall radially sets up a plurality of strengthening rib 2, steel strand wires 8's bottom and middle part and U type card steel strand wires 14 fixed connection, U type card steel strand wires 14's top is steel strand wires bonding section 11.

The number of the expanding heads 7 is one, the expanding heads 7 are arranged at the steel strand bonding section 11, the number of the expanding heads 7 is multiple, the distance between every two expanding heads 7 is not less than 6m, and the expanding heads are arranged at the upper part and the lower part of the steel strand bonding section 11 respectively by 1 m.

In the embodiment, a long spiral jet mixing pile machine is adopted to construct a cement pile firstly, high-pressure jet cutting stirring is carried out on the upper portion and the lower portion of a preset position, the enlarged head 7 is formed on the outer wall of the cement protective layer 6, a part of bonding prestressed uplift pile with the enlarged head is roughly divided into a short pile and a long pile, the short pile is provided with one enlarged head 7, the long pile is provided with two or more enlarged heads 7, then a drilling tool is put down to the bottom of the cement protective layer 6, concrete is pumped in the pipe until the top end of the cement protective layer 6, the concrete protective layer 5 is formed in the cement protective layer 6, and the processed steel bar steel strand cage is vibrated and inserted into the concrete protective layer 5 to the designed height to complete pile construction.

The reinforcing steel strand cage comprises the main reinforcement 1, the stirrups 4 and the steel strand 8, the main reinforcement 1 and the steel strand 8 are bundled and fixed into a hollow cylindrical shape through the stirrups 4, the top end of the main reinforcement 1 is fixed in the bottom plate 10, the bottom end of the main reinforcement 1 is in a V-shaped welded fixation mode and is convenient for vibration insertion, the top end of the steel strand 8 is fixedly connected with the bottom plate reinforcing steel bars 12 through the U-shaped clamps 13, the upper portion of the steel strand 8 is fixedly connected with the bottom plate 10 through the anchor heads 9, at least two V-shaped guide reinforcing rings 3 are radially arranged on the outer walls of the main reinforcement 1 and the steel strand 8, the problem that the existing reinforcing steel strand cage is inclined to insert and is not easy to center is solved, in order to avoid damage in the vibration inserting process, the outer walls of the main reinforcement 1 and the steel strand 8 are radially provided with a plurality of reinforcing ribs 2, avoid vibrations to insert the in-process down and damage, the bottom and the middle part of steel strand wires 8 with U type calorie steel strand wires 14 fixed connection, the top of U type calorie steel strand wires 14 is steel strand wires bonding section 11, accomplishes the construction of resistance to plucking stake this moment.

During the short pile, the number of the expanded heads 7 is one, and the expanded heads 7 are arranged at the positions of the steel strand bonding sections 11, during the long pile, the number of the expanded heads 7 is two or more, the distance between every two expanded heads 7 is not less than 6m, and the expanded heads are arranged at the positions of 1m above and below the positions of the steel strand bonding sections 11.

The utility model discloses the advantage:

the pile length or the pile diameter can be reduced under the same bearing capacity, so that not only is concrete and man-machine cost saved, but also the saving caused by only improving the bearing capacity can account for more than 20 percent of the total cost due to the advantages of improving the efficiency, civilizing the construction, avoiding the mud transportation cost and the like. The life of the buildings on the building is prolonged. The economic benefit is obvious, and the social benefit and the environmental protection benefit are obvious.

The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (3)

1. The utility model provides a partial bonding prestressing force uplift pile of area enlarged footing which characterized in that: cement protection layer (6) spout the stirring stake machine soon through long spiral and set up in preset position, set up one or more enlarged footing (7) on the outside of cement protection layer (6), pour concrete protection layer (5) in cement protection layer (6), vibrations insert reinforcing bar steel strand wires cage in concrete protection layer (5), reinforcing bar steel strand wires cage includes pulling force dispersion type, pressure dispersion type and draws and press combination stress dispersion type.

2. The partially bonded prestressed uplift pile with the enlarged head as claimed in claim 1, wherein: the reinforcing steel strand cage comprises a main reinforcement (1), stirrups (4) and steel strands (8), the main reinforcement (1) and the steel strands (8) are bundled and fixed into a hollow cylindrical shape through the stirrups (4), the top end of the main reinforcement (1) is arranged in a bottom plate (10), the bottom end of the main reinforcement (1) is welded and fixed in a V shape, the top end of the steel strands (8) is fixedly connected with a bottom plate steel bar (12) through a U-shaped clamp (13), the upper portion of the steel strands (8) is fixedly connected with the bottom plate (10) through an anchor head (9), the outer wall of the main reinforcement (1) and the steel strands (8) is radially provided with at least two V-shaped guide reinforcing rings (3), the outer wall of the main reinforcement (1) and the steel strands (8) is radially provided with a plurality of reinforcing ribs (2), the bottom end and the middle portion of the steel strands (8) are fixedly connected with the U-shaped clamp steel strands (14), the top end of the U-shaped steel clamping stranded wire (14) is a steel stranded wire bonding section (11).

3. The partially-bonded prestressed uplift pile with the enlarged head as claimed in claim 1 or 2, wherein: the steel strand bonding section (11) is arranged on the upper portion of the steel strand, the number of the expansion heads (7) is one, the distance between every two expansion heads (7) is not smaller than 6m, and the expansion heads are arranged on the upper portion and the lower portion of the steel strand bonding section (11) in a 1m mode.

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