阅读说明：本技术 一种带预埋管的超大直径灌注桩双层钢筋笼及其制作方法 (Super-large-diameter cast-in-place pile double-layer reinforcement cage with embedded pipe and manufacturing method thereof ) 是由 袁誉飞 梁森 陈建华 郭钢 艾姣姣 彭浩 谭智杰 于 2020-07-09 设计创作，主要内容包括：本发明公开了一种带预埋管的超大直径灌注桩双层钢筋笼及其制作方法,其中,双层钢筋笼包括内、外圈钢筋笼；内圈钢筋笼为螺旋箍筋沿轴向缠绕在多根内圈纵筋上的筒型笼状结构；外圈钢筋笼为多个加劲箍圈沿轴向均匀套在多根主筋上的筒型笼状结构；外圈钢筋笼套在内圈钢筋笼外；内圈钢筋笼内和外圈钢筋笼内插入有预埋管。上述双层钢筋笼避免了吊装时钢筋笼变形,防止了导管浇筑混凝土时上、下插拔对预埋管的破坏,保证了超大直径灌注桩的承载力。上述双层钢筋笼的制作方法,采用外圈钢筋笼和内圈钢筋笼整体制作,钢筋笼和预埋管一次加工成型,消除了因钢筋笼和预埋管接长和焊接期间导致的塌孔现象,大大提高了施工效率。(The invention discloses a double-layer reinforcement cage with a pre-buried pipe for an oversized-diameter cast-in-place pile and a manufacturing method thereof, wherein the double-layer reinforcement cage comprises an inner ring reinforcement cage and an outer ring reinforcement cage; the inner ring reinforcement cage is a cylindrical cage-shaped structure formed by winding spiral stirrups on a plurality of inner ring longitudinal reinforcements along the axial direction; the outer ring steel reinforcement cage is a cylindrical cage-shaped structure in which a plurality of stiffening hoops are uniformly sleeved on a plurality of main reinforcements along the axial direction; the outer ring steel reinforcement cage is sleeved outside the inner ring steel reinforcement cage; and embedded pipes are inserted into the inner ring reinforcement cage and the outer ring reinforcement cage. Above-mentioned double-deck steel reinforcement cage has avoided the steel reinforcement cage to warp when hoist and mount, and upper and lower plug has prevented when pipe concreting from to the destruction of pre-buried pipe, has guaranteed the bearing capacity of super large diameter bored concrete pile. According to the manufacturing method of the double-layer reinforcement cage, the outer ring reinforcement cage and the inner ring reinforcement cage are integrally manufactured, and the reinforcement cage and the embedded pipe are machined and formed at one time, so that the hole collapse phenomenon caused by the connection and welding of the reinforcement cage and the embedded pipe is eliminated, and the construction efficiency is greatly improved.)

1. A double-layer reinforcement cage with a pre-buried pipe for an oversized-diameter cast-in-place pile comprises an inner ring reinforcement cage and an outer ring reinforcement cage; the method is characterized in that:

the inner ring reinforcement cage is a cylindrical cage-shaped structure in which spiral stirrups are wound on a plurality of inner ring longitudinal reinforcements along the axial direction;

the outer ring steel reinforcement cage is a cylindrical cage-shaped structure in which a plurality of stiffening hoops are uniformly sleeved on a plurality of main reinforcements along the axial direction;

the outer ring reinforcement cage is sleeved outside the inner ring reinforcement cage;

and embedded pipes are inserted into the inner ring reinforcement cage and the outer ring reinforcement cage.

2. The double-layer reinforcement cage with the embedded pipe for the extra-large diameter cast-in-place pile is characterized in that a plurality of inner ring welding hoops are sleeved on the plurality of inner ring longitudinal ribs and are uniformly distributed along the extending direction of each inner ring longitudinal rib.

3. The double-layer reinforcement cage with the embedded pipe for the extra-large diameter cast-in-place pile of claim 1 or 2, wherein a plurality of outer-ring longitudinal bars are connected between the stiffening hoops, and the outer-ring longitudinal bars are uniformly arranged along the circumference of each stiffening hoop and extend axially.

4. The double-layer reinforcement cage of the ultra-large diameter bored concrete pile with the embedded pipe according to claim 3, wherein the outer layer spiral hoop is wound on the plurality of outer ring longitudinal bars in the axial direction.

5. The double-layer reinforcement cage with the embedded pipe for the extra-large diameter cast-in-place pile according to claim 4, wherein a plurality of outer-ring longitudinal bars are sleeved with a plurality of outer-layer stiffening hoops, and the outer-layer stiffening hoops are uniformly distributed along the extending direction of each outer-ring longitudinal bar.

6. The double-layer reinforcement cage with the embedded pipe and the extra-large diameter cast-in-place pile as claimed in claim 1, wherein a reinforcing rib shaped like a Chinese character 'jing' is connected between each stiffening hoop and the inner ring reinforcement cage, and the reinforcing ribs shaped like the Chinese character 'jing' are uniformly arranged along the axial direction of the inner ring reinforcement cage and the outer ring reinforcement cage.

7. The double-layer reinforcement cage with the embedded pipe for the extra-large diameter cast-in-place pile is characterized in that the embedded pipe comprises a drill core pipe and a sound measurement pipe, and the drill core pipe and the sound measurement pipe are fixed in a space between the inner ring reinforcement cage and the outer ring reinforcement cage.

8. The double-layer steel reinforcement cage of the ultra-large diameter cast-in-place pile with the embedded pipe as claimed in claim 7, wherein the embedded pipe further comprises a cooling pipe fixed in the inner space of the inner ring steel reinforcement cage.

9. The double-layer steel reinforcement cage of the ultra-large diameter cast-in-place pile with the embedded pipe as claimed in claim 8, wherein the embedded pipe further comprises a grouting pipe fixed in the inner space of the inner ring steel reinforcement cage and the space between the inner ring steel reinforcement cage and the outer ring steel reinforcement cage.

10. A manufacturing method of a double-layer reinforcement cage of an oversized-diameter cast-in-place pile with a pre-buried pipe is characterized by comprising the following steps:

bending the steel bar into a spiral stirrup by using a bending machine;

connecting the reinforcing steel bars into a plurality of inner ring longitudinal bars in a lap welding mode;

winding the spiral stirrup on a plurality of inner ring longitudinal bars along the axial direction and welding;

bending the reinforcing steel bars into a plurality of stiffening hoops by adopting a bending machine;

connecting the reinforcing steel bars into a plurality of main bars in a lap welding mode;

uniformly sleeving a plurality of stiffening hoops on a plurality of main ribs along the axial direction to form a cylindrical cage-shaped structure, and welding each stiffening hoop with each main rib;

inserting the inner ring reinforcement cage into the outer ring reinforcement cage, fixing the inner ring reinforcement cage and the outer ring reinforcement cage by using a reinforcement hoop after the positioning is accurate, and then respectively welding the inner ring reinforcement cage and the outer ring reinforcement cage with the reinforcement hoop;

inserting the embedded pipe into the inner ring reinforcement cage and the outer ring reinforcement cage, and fixing the embedded pipe with the inner ring reinforcement cage and the outer ring reinforcement cage in an iron wire binding mode; or the embedded pipes are fixed with the inner ring steel reinforcement cage and the outer ring steel reinforcement cage in a steel reinforcement welding mode.

Technical Field

The invention relates to the technical field of pile foundation construction, in particular to a cast-in-place pile double-layer reinforcement cage and a manufacturing method thereof.

Background

With the increasing development of economy, in the engineering field, more and more super high-rise buildings are pulled out of the ground, a large number of river-crossing and sea-crossing bridges are built in succession, with the continuous increase of the height and the volume of a main structure, the requirements on the bearing capacity of a cast-in-place pile are higher and higher, the requirements on the pile forming quality of the cast-in-place pile are also continuously improved, and the quality detection of a pile body is required after the construction of a large-diameter cast-in-place pile is completed.

The ultrasonic transmission method is the most commonly used method for detecting the pile body at present, is economical and rapid, can accurately determine the position and the size of the defect, can accurately judge the type of the defect through the characteristic condition of the ultrasonic acoustic parameters, and provides an important theoretical basis for judging and processing the quality grade of the concrete of the pile body.

The sound detecting pipe is a channel for the probe to enter the pile body when the ultrasonic detection method is carried out on the cast-in-place pile, and is also an important component of the ultrasonic detection system of the cast-in-place pile, the embedding quality is strictly controlled during construction, and the damage and the blockage are avoided so as to ensure that the detection work is carried out smoothly.

The grouting pipe is an important component of a pre-buried grouting pipe system and is mainly applied to the pile foundation post-grouting technology. The grouting pipe can effectively improve the bearing capacity of the pile foundation, helps concrete to be poured into various hollow joints, and can be completely sealed, so that the occurrence of fracture, displacement and deformation is prevented, and the pile foundation and bearing objects on the pile foundation are better protected. The post-grouting technique of the cast-in-place pile is characterized in that cement slurry is injected into a grouting pipe preset in a pile body, a pile end connected with the grouting pipe and a pile measuring grouting valve after the cast-in-place pile is formed for a certain time, so that a soil body on the pile side of the pile end is reinforced, the bearing capacity of a single pile is improved, and settlement is reduced.

The cooling pipe is a pre-buried cooling circulating water pipe and is mainly applied to temperature control of mass concrete. After the large-volume concrete is poured, in order to prevent cracking caused by temperature stress generated by overlarge temperature difference between the inside and the outside of the large-volume concrete, circulating cold water needs to be input into the cooling pipe to reduce the internal temperature of the concrete, so that the integrity and the durability of the concrete structure are ensured.

Under the normal condition, the cast-in-place pile with the super-large diameter may contain a grouting pipe, a sound detection pipe, a cooling pipe, a drilled core pipe or two or more pre-embedded pipes, and is often fixed on a double-layer reinforcement cage in a binding or welding mode when the reinforcement cage is processed. The Chinese utility model with the publication number of CN206616553U discloses a bored concrete pile reinforcement cage with an ultra-large length-diameter ratio, which is matched with core drilling detection, wherein a vertical steel pipe is fixedly arranged in the reinforcement cage of the bored concrete pile by using a reinforcement cage main rib, the bottom port of the vertical steel pipe is 1m away from the pile bottom, and the top orifice of the vertical steel pipe protrudes and extends at the top of the reinforcement cage; after the pouring of the pile body concrete is completed, the vertical steel pipe is kept as a hollow pipe, a drill bit of a drilling machine for core drilling detection can fall to a position 1m above the pile bottom along the hollow pipe, and core drilling sampling is carried out on the pile bottom of the poured pile. This utility model discloses though using vertical steel pipe as the pipe, can accurately bore the core sample, realize the quick effectual detection to the ground property on sediment thickness, the stake end holding force layer at the bottom of the stake of super large draw ratio bored concrete pile. However, because of the pre-buried pipe quantity of super large diameter pile foundation is many, how to avoid double-deck steel reinforcement cage to lead to the straightness that hangs down to meet the demands because of processing preparation to and how to solve double-deck steel reinforcement cage yielding, still a technical problem. Meanwhile, how to save the construction period is improved, the construction efficiency of the double-layer reinforcement cage is improved, and the reduction of the pipe laying time of the pile foundation reinforcement cage is also a technical problem.

Disclosure of Invention

The invention aims to provide a double-layer reinforcement cage of an oversized-diameter cast-in-place pile with a pre-embedded pipe, which avoids deformation of the reinforcement cage during hoisting, prevents damage to the pre-embedded pipe caused by up-down insertion and extraction during concrete pouring of a guide pipe, and ensures the bearing capacity of the oversized-diameter cast-in-place pile.

The invention also aims to provide a manufacturing method of the double-layer reinforcement cage of the ultra-large diameter cast-in-place pile with the embedded pipe, which adopts the integral manufacturing of the outer ring reinforcement cage and the inner ring reinforcement cage, thereby greatly improving the construction efficiency.

In order to achieve the above purpose, the invention provides the following technical scheme:

a double-layer reinforcement cage with a pre-buried pipe for an oversized-diameter cast-in-place pile comprises an inner ring reinforcement cage and an outer ring reinforcement cage;

the inner ring reinforcement cage is a cylindrical cage-shaped structure in which spiral stirrups are wound on a plurality of inner ring longitudinal reinforcements along the axial direction;

the outer ring steel reinforcement cage is a cylindrical cage-shaped structure in which a plurality of stiffening hoops are uniformly sleeved on a plurality of main reinforcements along the axial direction;

the outer ring reinforcement cage is sleeved outside the inner ring reinforcement cage;

and embedded pipes are inserted into the inner ring reinforcement cage and the outer ring reinforcement cage.

Furthermore, a plurality of inner ring welding hoops are sleeved on the inner ring longitudinal ribs and are uniformly distributed along the extending direction of each inner ring longitudinal rib.

Furthermore, be connected with many outer lanes between each hoop of putting more energy into and indulge the muscle, these outer lanes are indulged the muscle and are evenly arranged and extend along the axial along the circumference of each hoop of putting more energy into.

Further, the outer layer spiral hoop is wound on the outer ring longitudinal ribs along the axial direction.

Furthermore, a plurality of outer stiffening hoops are sleeved on the outer ring longitudinal ribs and are evenly distributed along the extending direction of each outer ring longitudinal rib.

Furthermore, a reinforcing rib shaped like a Chinese character 'jing' is connected between each stiffening hoop and the inner ring steel reinforcement cage, and the reinforcing ribs shaped like the Chinese character 'jing' are uniformly distributed along the axial direction of the inner ring steel reinforcement cage and the outer ring steel reinforcement cage.

Furthermore, the embedded pipe comprises a drill core pipe and a sound measuring pipe, and the drill core pipe and the sound measuring pipe are fixed in a space between the inner ring reinforcement cage and the outer ring reinforcement cage.

Further, the embedded pipe also comprises a cooling pipe, and the cooling pipe is fixed in the inner space of the inner ring reinforcement cage.

Furthermore, the embedded pipe also comprises a grouting pipe which is fixed in the inner space of the inner ring steel reinforcement cage and the space between the inner ring steel reinforcement cage and the outer ring steel reinforcement cage.

A manufacturing method of a double-layer reinforcement cage of an oversized-diameter cast-in-place pile with a pre-buried pipe comprises the following steps:

bending the steel bar into a spiral stirrup by using a bending machine;

connecting the reinforcing steel bars into a plurality of inner ring longitudinal bars in a lap welding mode;

winding the spiral stirrup on a plurality of inner ring longitudinal bars along the axial direction and welding;

bending the reinforcing steel bars into a plurality of stiffening hoops by adopting a bending machine;

connecting the reinforcing steel bars into a plurality of main bars in a lap welding mode;

uniformly sleeving a plurality of stiffening hoops on a plurality of main ribs along the axial direction to form a cylindrical cage-shaped structure, and welding each stiffening hoop with each main rib;

inserting the inner ring reinforcement cage into the outer ring reinforcement cage, fixing the inner ring reinforcement cage and the outer ring reinforcement cage by using a reinforcement hoop after the positioning is accurate, and then respectively welding the inner ring reinforcement cage and the outer ring reinforcement cage with the reinforcement hoop;

inserting the embedded pipe into the inner ring reinforcement cage and the outer ring reinforcement cage, and fixing the embedded pipe with the inner ring reinforcement cage and the outer ring reinforcement cage in an iron wire binding mode; or the embedded pipes are fixed with the inner ring steel reinforcement cage and the outer ring steel reinforcement cage in a steel reinforcement welding mode.

The double-layer reinforcement cage with the embedded pipe for the ultra-large diameter cast-in-place pile provided by the invention avoids the deformation of the reinforcement cage during hoisting, prevents the damage of the embedded pipe caused by the up-and-down insertion and extraction during the concrete pouring of the guide pipe, and ensures the bearing capacity of the ultra-large diameter cast-in-place pile.

According to the manufacturing method of the double-layer reinforcement cage of the ultra-large diameter cast-in-place pile with the embedded pipe, the outer ring reinforcement cage and the inner ring reinforcement cage are integrally manufactured, and the reinforcement cage and the embedded pipe are machined and formed at one time, so that the hole collapse phenomenon caused by the lengthening and welding period of the reinforcement cage and the embedded pipe is eliminated, and the construction efficiency is greatly improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.

Fig. 1 is a side view of an inner ring reinforcement cage in a double-layer reinforcement cage of an oversized-diameter cast-in-place pile with a pre-buried pipe according to an embodiment of the present invention;

fig. 2 is a side view of an outer ring reinforcement cage framework in a double-layer reinforcement cage of an oversized-diameter cast-in-place pile with a pre-buried pipe according to an embodiment of the present invention;

fig. 3 is a side view of the double-layer reinforcement cage with the embedded pipe of the ultra-large diameter cast-in-place pile according to the embodiment of the present invention, after the inner ring reinforcement cage is inserted into the outer ring reinforcement cage framework for positioning;

fig. 4 is a schematic cross-sectional view of a double-layer steel reinforcement cage main reinforcement, a stiffening hoop and a spiral hoop of the ultra-large diameter cast-in-place pile with a pre-buried pipe according to an embodiment of the present invention;

fig. 5 is a schematic cross-sectional view of a double-layer reinforcement cage of an oversized-diameter cast-in-place pile with a pre-buried pipe according to an embodiment of the invention;

fig. 6 is a schematic view of fixing a pre-buried pipe in a double-layer reinforcement cage of an oversized-diameter cast-in-place pile with the pre-buried pipe according to an embodiment of the present invention;

fig. 7 is a schematic diagram of reinforcement of a double-layer reinforcement cage of an oversized-diameter cast-in-place pile with a pre-buried pipe according to an embodiment of the invention.

Description of reference numerals:

1. a main rib; 2. a stiffening ferrule; 3. a spiral stirrup; 4. drilling a core pipe; 5. a sound detection tube; 6. a cooling tube; 7. a grouting pipe; 8. inner ring longitudinal ribs; 9. welding a coupling on the inner ring; 10. outer ring longitudinal ribs; 11. an outer layer spiral hoop; 12. an outer stiffening hoop; 13. a reinforcing rib shaped like a Chinese character 'jing'; 14. an "L" type reinforcement member; 15. "U" type reinforcement members.

Detailed Description

In order to make the technical solutions of the present invention better understood, those skilled in the art will now describe the present invention in further detail with reference to the accompanying drawings.

Referring to fig. 1 to 7, the double-layer reinforcement cage with the embedded pipe for the oversized-diameter cast-in-place pile comprises an inner ring reinforcement cage and an outer ring reinforcement cage. The inner ring reinforcement cage is a cylindrical cage-shaped structure formed by winding the spiral stirrups 3 on the inner ring longitudinal bars 8 along the axial direction. The outer ring steel reinforcement cage is a cylindrical cage-shaped structure in which a plurality of stiffening hoops 2 are uniformly sleeved on a plurality of main reinforcements 1 along the axial direction. The outer ring steel reinforcement cage is sleeved outside the inner ring steel reinforcement cage. And embedded pipes are inserted into the inner ring reinforcement cage and the outer ring reinforcement cage.

The manufacturing method of the double-layer reinforcement cage with the embedded pipe for the ultra-large diameter cast-in-place pile comprises the following steps:

inner ring reinforcement cage manufacturing

1.1 cutting a steel plate into a tire mold pedestal, and bending a steel bar into a spiral stirrup 3 by using a bending machine;

1.2, connecting the reinforcing steel bars into a plurality of inner ring longitudinal bars 8 in a lap welding mode;

1.3, winding the spiral stirrup 3 on a plurality of inner ring longitudinal ribs 8 along the axial direction and welding;

manufacturing method of outer ring reinforcement cage framework

2.1 bending the reinforcing steel bars into a plurality of stiffening hoops 2 by adopting a bending machine;

2.2 connecting the reinforcing steel bars into a plurality of main bars 1 by adopting a lap welding mode;

2.3 uniformly sleeving a plurality of stiffening hoops 2 on a plurality of main ribs 1 along the axial direction to form a cylindrical cage-shaped structure, and welding each stiffening hoop 2 with each main rib 1;

inner and outer ring reinforcement cage assembly

Inserting the inner ring reinforcement cage into the outer ring reinforcement cage, fixing the inner ring reinforcement cage and the outer ring reinforcement cage by using a reinforcement hoop after the positioning is accurate, and then respectively welding the inner ring reinforcement cage and the outer ring reinforcement cage with the reinforcement hoop;

installation of embedded pipe of reinforcement cage

Inserting the embedded pipe into the inner ring reinforcement cage and the outer ring reinforcement cage, and fixing the embedded pipe with the inner ring reinforcement cage and the outer ring reinforcement cage in an iron wire binding mode; or the embedded pipes are fixed with the inner ring steel reinforcement cage and the outer ring steel reinforcement cage in a steel reinforcement welding mode.

Specifically, the double-layer reinforcement cage with the embedded pipe for the ultra-large diameter cast-in-place pile comprises an inner ring reinforcement cage and an outer ring reinforcement cage.

As shown in fig. 1 and 7, the inner ring reinforcement cage includes a spiral stirrup 3 and a plurality of inner ring longitudinal bars 8, as shown in fig. 7, the inner ring longitudinal bars 8 are uniformly arranged in a circular shape and extend in the axial direction, and the inner ring longitudinal bars 8 are parallel to each other. The spiral stirrup 3 is wound on the inner ring longitudinal bars 8 to form a cylindrical cage-shaped structure, and the diameter of the steel bar for manufacturing the spiral stirrup 3 is more than or equal to 10 mm.

As shown in fig. 2, outer lane steel reinforcement cage includes a plurality of hoops of putting more energy 2 and many owner muscle 1, and the hoop of putting more energy 2 is the annular shape, and these 2 covers of putting more energy into are in just evenly arranging along the axial outside the inner circle steel reinforcement cage, and each hoop of putting more energy into 2 is coaxial with the inner circle steel reinforcement cage. Many owner muscle 1 is fixed and is evenly arranged around the circumference of each stiffening hoop 2 on each stiffening hoop 2, and these owner muscle 1 is along axial extension and parallel to each other and be circular evenly arranging. As shown in fig. 2, the outer ring steel reinforcement cage is a cylindrical cage-shaped structure in which a plurality of stiffening hoops 2 are uniformly sleeved on a plurality of main reinforcements 1 along the axial direction. The diameter of the steel bar for manufacturing the main reinforcement 1 is larger than or equal to 18mm, and the diameter of the steel bar for manufacturing the stiffening hoop 2 is larger than or equal to 12 mm.

As shown in fig. 3 and 4, the outer ring reinforcement cage is sleeved outside the inner ring reinforcement cage, and the inner ring reinforcement cage and the outer ring reinforcement cage are coaxially arranged.

And embedded pipes are inserted into the inner ring reinforcement cage and the outer ring reinforcement cage. As shown in fig. 5, the pre-buried pipe includes a core drilling pipe 4, an acoustic pipe 5, a cooling pipe 6 and a grout pipe 7. The drill core pipe 4 and the sound measuring pipe 5 are fixed in the space between the inner ring reinforcement cage and the outer ring reinforcement cage. The cooling pipe 6 is fixed in the inner space of the inner ring reinforcement cage. And the grouting pipe 7 is fixed in the inner space of the inner ring reinforcement cage and the space between the inner ring reinforcement cage and the outer ring reinforcement cage. The number of the drill core pipes 4 is more than or equal to 2, and the number of the sounding pipes 5 is more than or equal to 4. The number of cooling tubes 6 is even. The number of the grouting pipes 7 is more than or equal to 2, in the embodiment, the number of the grouting pipes 7 is 7, wherein the number of the grouting pipes 7 located in the inner space of the inner ring reinforcement cage is 4, and the number of the grouting pipes 7 located in the space between the inner ring reinforcement cage and the outer ring reinforcement cage is 3.

As shown in fig. 7, a plurality of circular inner ring welding collars 9 are sleeved on the plurality of inner ring longitudinal ribs 8, and the inner ring welding collars 9 are uniformly arranged along the extending direction of each inner ring longitudinal rib 8. Be connected with many outer lanes between each hoop 2 of putting more energy into and indulge muscle 10, these outer lanes indulge muscle 10 and evenly arrange and extend along the axial along the circumference of each hoop 2 of putting more energy into. One with outer lane indulge muscle 10 welding on the circumference of each stiffening hoop 2, then, these outer lane indulge muscle 10 and evenly arrange along the circumference of each stiffening hoop 2 and be circular. The outer layer spiral hoop 11 is wound on the outer ring longitudinal ribs 10 along the axial direction.

As shown in fig. 7, a plurality of circular outer-layer stiffening hoops 12 are sleeved on the outer-ring longitudinal ribs 10, and the outer-layer stiffening hoops 12 are uniformly arranged along the extending direction of each outer-ring longitudinal rib 10. A reinforcing rib 13 shaped like a Chinese character 'jing' is connected between each stiffening hoop 2 and the inner ring steel reinforcement cage, and the reinforcing ribs 13 shaped like the Chinese character 'jing' are uniformly distributed along the axial direction of the inner ring steel reinforcement cage and the outer ring steel reinforcement cage.

In the manufacturing process of the double-layer reinforcement cage of the ultra-large diameter cast-in-place pile with the embedded pipe, a reinforcement cage framework manufacturing platform needs to be erected and two reinforcement cages need to be stacked. The steel bar cage stacking platform is formed by overlapping steel bars and steel bars in a criss-cross mode, and the lower portion of the steel bar cage stacking platform is fixed with a seven-shaped steel bar formed by spot welding on the ground. The steel reinforcement cage framework manufacturing platform adopts a cage rolling machine with the length of about 20m to carry out a series of automatic procedures such as raw material paying-off, steel reinforcement straightening, reinforcement winding forming, roll welding forming and the like.

The manufacturing method of the double-layer reinforcement cage with the embedded pipe for the ultra-large diameter cast-in-place pile comprises the following steps:

inner ring reinforcement cage manufacturing

1.1 cutting a steel plate into a tire mold pedestal, and bending a steel bar into a spiral stirrup 3 by using a bending machine;

1.2, connecting the reinforcing steel bars into a plurality of inner ring longitudinal bars 8 in a lap welding mode;

1.3, winding the spiral stirrup 3 on a plurality of inner ring longitudinal ribs 8 along the axial direction and welding;

manufacturing method of outer ring reinforcement cage framework

2.1 bending the reinforcing steel bars into a plurality of stiffening hoops 2 by adopting a bending machine;

2.2 connecting the reinforcing steel bars into a plurality of main bars 1 by adopting a lap welding mode;

2.3 uniformly sleeving a plurality of stiffening hoops 2 on a plurality of main ribs 1 along the axial direction to form a cylindrical cage-shaped structure, and welding each stiffening hoop 2 with each main rib 1;

inner and outer ring reinforcement cage assembly

Inserting the inner ring reinforcement cage into the outer ring reinforcement cage, fixing the inner ring reinforcement cage and the outer ring reinforcement cage by using a reinforcement hoop after the positioning is accurate, and then respectively welding the inner ring reinforcement cage and the outer ring reinforcement cage with the reinforcement hoop;

installation of embedded pipe of reinforcement cage

Inserting the embedded pipe into the inner ring reinforcement cage and the outer ring reinforcement cage, and fixing the embedded pipe with the inner ring reinforcement cage and the outer ring reinforcement cage in an iron wire binding mode; or the embedded pipes are fixed with the inner ring steel reinforcement cage and the outer ring steel reinforcement cage in a steel reinforcement welding mode.

Taking a specific double-layer reinforcement cage of an oversized-diameter cast-in-place pile with a pre-buried pipe as an example; according to the diameter of an outer ring steel reinforcement cage of 1.4m, the diameter of a stiffening hoop 2 is [email protected], the diameter of an inner ring steel reinforcement cage of 1.4m, the diameter of a spiral stirrup 3 is [email protected], the diameter of a main reinforcement 1 is 18mm, and 16 pieces in total are subjected to blanking. Adopt the angle bending machine with spiral stirrup 3 bending forming, adopt the mode of overlap joint welding to connect into many inner circles with the reinforcing bar and indulge muscle 8, with spiral stirrup 3 along the axial winding on many inner circles are indulged muscle 8 and are welded.

Adopt the bender to become a plurality of stiffening stirrup 2 with the reinforcing bar bending, adopt overlap joint welding's mode to connect into a plurality of owner muscle 1 with the reinforcing bar.

The manufactured inner ring steel reinforcement cage is hoisted by a crane, the stiffening hoop 2 (the diameter of [email protected]) is sleeved outside the inner ring steel reinforcement cage to be positioned and fixed on a cage rolling machine, and then the stiffening hoop 2 (the diameter of [email protected]) and the outer layer stiffening hoop 12 (the diameter of [email protected]) are fixed in a lap welding mode. The spiral stirrup 3 (with the diameter of [email protected]) and the inner ring longitudinal bar 8 (in the embodiment, the inner ring longitudinal bar 8 adopts 16 steel bars with the diameter of 18 mm) are subjected to spot welding and then are bound and fixed by steel wires.

The outer-layer stiffening hoops 12 (with the diameter of [email protected]) are fixed on the cage rolling machine at intervals according to the design requirement, the outer-ring longitudinal ribs 10 are welded on the outer-layer stiffening hoops 12 through the operation of the cage rolling machine, and the outer-ring longitudinal ribs 10 (in the embodiment, the outer-ring longitudinal ribs 10 are 76 reinforcing steel bars with the diameter of 36 mm) are welded in a manner of being separated from one another. (the outer ring longitudinal bar 10 with the diameter being more than or equal to 22 can adopt sleeve connection)

The reinforcing ribs 13 shaped like Chinese character 'jing' are welded and fixed with the outer ring reinforcement cage in an overlapping way.

The manufacturing and installation of the outer-layer spiral hoop 11 becomes an important link of the construction of the steel reinforcement cage, the position of the upper outlet and the lower outlet of the double-spiral diameter 12mm stirrup of the steel reinforcement straightening machine is used for fixing the stirrup, and the space between the stirrups (two 12mm and the space between the stirrups is 90mm) is controlled in an auxiliary mode. Meanwhile, the reinforcement cage rolling machine starts to operate to enable the stirrups to be wound on the outer-ring longitudinal bars 10 along the axial direction to form the outer-layer spiral hoops 11, and a reinforcement worker carries out welding of the stirrups and the outer-ring longitudinal bars 10 on the side.

The embedded pipes comprise a drilling core pipe 4, a sound measuring pipe 5, a cooling pipe 6 and a grouting pipe 7, are inserted into the inner ring reinforcement cage and the outer ring reinforcement cage, and are fixed with the inner ring reinforcement cage and the outer ring reinforcement cage in an iron wire binding mode; alternatively, as shown in fig. 6, the embedded pipe is fixed to the inner and outer ring reinforcement cages by welding to the main reinforcement 1 by means of the "L" shaped reinforcement member 14 and/or the "U" shaped reinforcement member 15. The grouting pipe 7 is provided with a grouting ring at a hole opening of 6 m/channel under moderate and micro weathering according to design requirements.

Compared with the prior art, the double-layer reinforcement cage with the embedded pipe oversized-diameter cast-in-place pile is formed in one step, the length of the double-layer reinforcement cage can reach 30m, deformation does not occur during hoisting, the installation efficiency of the reinforcement cage is improved, and the pile foundation construction quality is guaranteed.

The double-layer reinforcement cage with the embedded pipe for the ultra-large diameter cast-in-place pile provided by the embodiment has the advantages that the deformation of the reinforcement cage during hoisting is avoided, the damage of the embedded pipe caused by the up-down insertion and extraction during the concrete pouring of the guide pipe is prevented, the bearing capacity of the ultra-large diameter cast-in-place pile is ensured, the ultrasonic wave and the loose core detection quantity of design requirements are met, and the pile forming quality is ensured.

The method for manufacturing the double-layer reinforcement cage of the ultra-large diameter cast-in-place pile with the embedded pipe adopts the outer ring reinforcement cage and the inner ring reinforcement cage to be integrally manufactured, and the influence of the selection of construction machinery, construction procedures and construction processes for manufacturing the reinforcement cage on the reinforcement cage is very great; the cage rolling machine replaces the operation of conventional personnel, and a high-power motor is selected for the cage rolling machine to increase the rotating torque and the power, so that the construction efficiency is greatly improved.

While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.