CN108755729B

CN108755729B - CFG pile foundation pile cap and pile body integrated construction device and method

Info

Publication number: CN108755729B
Application number: CN201810946185.3A
Authority: CN
Inventors: 刘璋; 刘明; 涂少林; 张迪; 王春露; 严朝峰; 王永丽
Original assignee: No1 Engineering Corp Ltd Of Cr20g
Current assignee: China Railway Construction Urban Construction Transportation Development Co ltd
Priority date: 2018-08-20
Filing date: 2018-08-20
Publication date: 2023-07-04
Anticipated expiration: 2038-08-20
Also published as: CN108755729A

Abstract

The invention discloses a CFG pile cap and pile body integrated construction device and a method, wherein the device comprises a long spiral pile machine for constructing a constructed CFG pile and a pile cap construction device arranged on the long spiral pile machine, and the pile cap construction device comprises a pile cap drill bit and a drill bit guide frame for guiding the pile cap drill bit; the method comprises the following steps: 1. positioning a drilling machine; 2. the pile cap construction device and the power transmission piece are installed; 3. drilling a pile cap forming hole; 4. drilling a pile body forming hole; 5. lifting the drill and synchronously pouring concrete of the pile body; 6. and (5) lifting the drill and synchronously pouring pile cap concrete. The pile cap forming device is reasonable in design, simple and convenient to operate and good in use effect, the pile cap drill bit and the drill bit guide frame are additionally arranged on the long spiral pile machine to form the pile cap construction device, the long spiral pile machine drill rod is adopted to drive the pile cap construction device to rotate to complete drilling of the pile cap forming hole, power equipment is not required to be additionally arranged, and the pile cap and pile body integrated construction process can be realized.

Description

CFG pile foundation pile cap and pile body integrated construction device and method

Technical Field

The invention belongs to the technical field of pile foundation construction, and particularly relates to a CFG pile foundation pile cap and pile body integrated construction device and method.

Background

CFG piles are also called cement fly ash gravel piles, and are made of broken stone, stone dust, sand and fly ash cement by adding water, mixing them into slurry, and using various pile-forming machines to make variable strength piles with a certain strength. The CFG pile is a low-strength concrete pile, can fully utilize the combined action of bearing capacity of soil among piles, can transfer load into a deep foundation, and has good technical performance and economic effect. Long screw pile machines, also known as long screw drills, comprise two parts, a hydraulic walking pile frame and a drilling system. The pile frame generally adopts a hydraulic walking chassis, has high automation degree, can walk automatically and rotate 360 degrees, is provided with four hydraulic support legs and a walking oil cylinder to assist walking and rotation, and can increase the stability of the whole machine during construction and can be transported by the whole machine. The upright post of the pile frame is a foldable box-shaped upright post. The drilling system comprises a power head and a drilling tool, an output shaft of the power head and the spiral drilling tool are hollow, the pile machine adopts long spiral hole forming, concrete (or slurry) pumping can be carried out in a drill rod, CFG pile construction is completed, the hole forming can be completed in one machine, and the drilling system can also be used for carrying out construction by adopting a plurality of methods such as deep stirring after the drilling tool is changed by dry hole forming and grouting replacement. At present, when a long spiral drilling machine is adopted for CFG pile construction, pile body forming is carried out, pile cap construction is carried out, and the working procedures of pile surrounding soil excavation, pile head cutting, pile cap construction, pile surrounding backfill tamping and the like are needed, so that the method has the defects of multiple working procedures, long construction time, high cost and the like.

Disclosure of Invention

The invention aims to solve the technical problems in the prior art and provides the CFG pile cap and pile body integrated construction device which is reasonable in structural design, simple and convenient to operate and good in use effect.

In order to solve the technical problems, the invention adopts the following technical scheme: CFG pile foundation pile cap and pile shaft integration construction equipment, its characterized in that: the pile cap construction device comprises a pile cap drill bit for performing hole forming construction on a pile cap of the constructed CFG pile and a drill bit guide frame for guiding the pile cap drill bit, wherein the drill bit guide frame is arranged on the pile cap drill bit, the pile cap drill bit is vertically distributed, and the drill bit guide frame is horizontally distributed; the constructed CFG pile comprises a pile body and a pile cap coaxially arranged at the upper part of the pile body, wherein the pile body and the pile cap are connected into a whole, the cross sections of the pile body and the pile cap are round, and the pile cap and the pile body are vertically arranged; the diameters of the pile bodies are the same from bottom to top;

The pile cap drill bit comprises a drill cylinder and an auger blade which is arranged on the outer side wall of the lower part of the drill cylinder from top to bottom along the circumferential direction, the drill cylinder is a cylindrical steel sleeve which is coaxially sleeved on a drill rod of a long auger pile machine from bottom to top and is driven by the drill rod to synchronously rotate, a rotary pushing mechanism for pushing the drill cylinder to synchronously rotate is arranged on the drill rod, and the vertical distance between the rotary pushing mechanism and the bottom end of the drill rod is not larger than the height of the drill cylinder;

the drill bit guide frame comprises a fixed lantern ring coaxially sleeved on the drill cylinder and a lantern ring fixing piece for mounting the fixed lantern ring on a pile frame of the long spiral pile machine, wherein the fixed lantern ring and the lantern ring fixing piece are horizontally arranged, one end of the lantern ring fixing piece is connected with the fixed lantern ring, and the other end of the lantern ring fixing piece is connected with the pile frame.

Above-mentioned CFG pile foundation pile cap and pile shaft integration construction equipment, characterized by: the diameter of the pile cap is the same from bottom to top, and the diameter of the pile body is smaller than that of the pile cap; the auger blade is a spiral blade, the outer diameters of the spiral blade are the same from bottom to top, the outer diameters of the spiral blade are the same as the diameter of the pile cap, and the widths of the spiral blade are the same from bottom to top.

Above-mentioned CFG pile foundation pile cap and pile shaft integration construction equipment, characterized by: the diameter of the pile cap is gradually increased from bottom to top, and the bottom diameter of the pile cap is the same as the diameter of the pile body; the spiral drill is a spiral blade, the outer diameter of the spiral blade is gradually increased from bottom to top, the outer diameter of the bottom of the spiral blade is the same as the diameter of the pile body, and the width of the spiral blade is gradually increased from bottom to top.

Above-mentioned CFG pile foundation pile cap and pile shaft integration construction equipment, characterized by: the drill bit guide frame is a movable guide frame which can vertically move up and down along the pile frame and drive the pile cap drill bit to synchronously move up and down, the fixed sleeve ring is sleeved on the outer side of the upper part of the pile cap drill bit, and the spiral drill bit is positioned below the fixed sleeve ring; the upper outer side wall of the drill cylinder is provided with a collar limiting piece for limiting the fixed collar, the collar limiting piece comprises an upper limiting piece and a lower limiting piece positioned right below the upper limiting piece, and the upper limiting piece and the lower limiting piece are horizontally distributed and both are fixed on the upper outer side wall of the drill cylinder; the fixed lantern ring is a cylindrical lantern ring clamped between the upper limiting piece and the lower limiting piece.

Above-mentioned CFG pile foundation pile cap and pile shaft integration construction equipment, characterized by: the long spiral pile machine comprises a pile frame and a drilling system, wherein the pile frame comprises a stand column and a moving mechanism for driving the stand column to move; the drilling system comprises a drilling tool and a power head for driving the drilling tool, and a guide rail for the power head to move up and down is arranged on the upright post;

the lantern ring mounting comprises a clamping piece which is clamped on the guide rail and can move up and down along the guide rail, the fixed lantern ring and the clamping piece are fixedly connected through a connecting piece, and the clamping piece and the connecting piece are arranged on the same horizontal plane.

Above-mentioned CFG pile foundation pile cap and pile shaft integration construction equipment, characterized by: the drill rod comprises a core rod and screw thread blades which are arranged on the outer side of the core rod from bottom to top, the core rod is a cylindrical rod, the screw drill is a screw thread drill, and the screw thread blades and the screw drill have the same screw thread direction;

the top of boring section of thick bamboo has set up a plurality of power transmission spare along the circumferencial direction, rotatory pushing mechanism is including a plurality of layout on the screw blade and carry out the rotatory impeller that promotes the power transmission spare, every power transmission spare is by one rotatory impeller promotes, every rotatory impeller all is located the power transmission spare rear side that promotes.

Above-mentioned CFG pile foundation pile cap and pile shaft integration construction equipment, characterized by: the power transmission parts are uniformly distributed on the same horizontal plane; each power transmission piece comprises a vertical stop block fixed on the outer side of the top of the drill cylinder and a horizontal pin shaft arranged on the vertical stop block, and a through hole for inserting the horizontal pin shaft is formed in the vertical stop block; the structure and the size of the plurality of horizontal pin shafts are the same, the plurality of horizontal pin shafts are distributed along the circumferential direction, and the central axes of the plurality of horizontal pin shafts are intersected with the central axis of the drilling barrel; the horizontal distance between the inner end of each horizontal pin shaft and the central axis of the drill cylinder is larger than

Wherein d is the outer diameter of the core rod.

Meanwhile, the invention also provides a CFG pile cap and pile body integrated construction method which has the advantages of simple steps, reasonable design, simple construction, short construction period and good use effect, and is characterized by comprising the following steps:

step one, positioning a drilling machine: moving the long spiral pile machine to a construction area of the constructed CFG pile, and enabling a drill rod to be positioned right above the pile position of the constructed CFG pile;

step two, pile cap construction device and power transmission piece installation: installing the pile cap construction device on the long spiral pile machine which moves in place in the first step, simultaneously installing a plurality of power transmission parts at the top of the drilling barrel, and vertically moving the drill rod downwards until each rotary pushing part is positioned at the rear side of the pushed power transmission part, wherein the drill rod and the pile cap construction device form a pile cap drilling hole forming device;

Drilling a pile cap forming hole: drilling the hole forming device by adopting the pile cap drilling in the second step from top to bottom to obtain a pile cap forming hole formed by construction;

in the drilling process of the pile cap drilling hole forming device from top to bottom, a drill rod is adopted to drill from top to bottom; in the process of drilling the drill rod from top to bottom, the rotary pushing mechanism pushes the drill cylinder to synchronously drill from top to bottom;

drilling a pile body forming hole: removing the power transmission parts in the second step, and continuously drilling from top to bottom by using a drill rod to obtain a pile body forming hole formed by construction;

step five, lifting the drill and synchronously pouring concrete of the pile body: lifting the drill rod upwards until the bottom of the drill rod is level with the bottom of the pile cap forming hole; in the upward lifting process, grouting equipment is adopted, and concrete is synchronously poured into pile body forming holes from bottom to top through a drill rod, so that the concrete pouring construction process of the pile body is completed;

the grouting equipment is connected with the upper end of the drill rod through a grouting pipeline;

step six, lifting the drill and synchronously pouring concrete of the pile cap: lifting the drill rod upwards until the drill rod is lifted out of the pile cap forming hole; and in the upward lifting process, the grouting equipment is adopted, and concrete is synchronously poured into the pile cap forming hole from bottom to top through a drill rod, so that the concrete pouring construction process of the pile cap is completed.

The method is characterized in that: in the second step, a plurality of power transmission parts are uniformly distributed on the same horizontal plane; each power transmission piece comprises a vertical stop block fixed on the outer side of the top of the drill cylinder and a horizontal pin shaft arranged on the vertical stop block, and a through hole for inserting the horizontal pin shaft is formed in the vertical stop block; the structure and the size of the plurality of horizontal pin shafts are the same, the plurality of horizontal pin shafts are distributed along the circumferential direction, and the central axes of the plurality of horizontal pin shafts are intersected with the central axis of the drilling barrel; the horizontal distance between the inner end of each horizontal pin shaft and the central axis of the drill cylinder is larger than

Wherein d is the outer diameter of the core rod;

the bottom of a drill rod in the pile cap drilling hole forming device is flush with the bottom of the drill cylinder;

step two, when a plurality of power transmission parts are arranged on the top of the drilling barrel, a horizontal pin shaft is inserted into each vertical stop block, and the inserted horizontal pin shaft is positioned at the front side of one rotary pushing part;

in the fourth step, when the power transmission parts are all removed, the horizontal pin shafts are all pulled out from the vertical stop blocks;

step six, before the synchronous pouring construction of the lifting drill and the pile cap concrete, the pile cap construction device is lifted from the pile cap forming hole from bottom to top; or in the sixth step, in the synchronous grouting construction process of the pile cap concrete, the pile cap construction device and the drill rod are synchronously lifted from bottom to top.

The method is characterized in that: before the drill rod is lifted upwards in the fifth step, the concrete is fully filled in the drill rod through the grouting equipment;

in the fifth step, when the drill rod is lifted upwards, the drill rod is lifted upwards at a constant speed, and the lifting speed is 2 m/min-3 m/min; when the drill rod is lifted upwards in the step six, lifting the drill rod upwards at a constant speed, wherein the lifting speed is smaller than that of the drill rod in the step five;

step one, after a long spiral pile machine is moved to a construction area of a constructed CFG pile, lifting a drill rod upwards, and enabling the vertical distance between the bottom of the drill rod and the ground to be larger than the height of a drilling barrel;

two lifting lugs are symmetrically arranged on the outer side of the fixed lantern ring in the pile cap construction device, a lifting hole for a lifting rope to pass through is formed in the middle of each lifting lug, and the bottom of each lifting rope is bound and fixed on each lifting lug;

after the pile cap construction device is installed on the long spiral pile machine, fixing the upper parts of the two lifting ropes on a power head of the long spiral pile machine, and lifting the pile cap construction device below the power head through the two lifting ropes;

synchronously lowering the pile cap construction device and the drill rod until the bottom of the drill cylinder is supported on the ground before drilling the pile cap forming hole;

In the fourth step, when the power transmission parts in the second step are all dismantled, the upper parts of the two lifting ropes are detached from the power head so as to disconnect the pile cap construction device from the power head;

and step six, before the drill rod is lifted upwards, fixing the upper parts of the two lifting ropes on the power head, and lifting the pile cap construction device and the drill rod synchronously from bottom to top.

Compared with the prior art, the invention has the following advantages:

1. the pile cap construction device has the advantages of simple structure, reasonable design, simple installation, convenient use and operation and lower input cost.

2. The pile cap construction device is driven by the existing long spiral pile machine to rotate and move up and down, power equipment is not required to be additionally arranged, equipment input cost can be effectively saved, the pile cap construction device can be synchronously carried out with a drill rod, synchronism and stability of a drilling process are ensured, and pile forming quality can be effectively guaranteed.

3. The construction method has the advantages that the modification to the existing long spiral pile machine is small, the CFG pile cap and pile body integrated construction device can be obtained only by installing the pile cap construction device on the long spiral pile machine, the pile cap drill bit and the guide device (namely the drill guide frame) are added by simply and conveniently modifying the long spiral drilling machine, and the integrated construction of the plain concrete pile cap and the pile body can be satisfied without additionally adding power.

4. The construction method is simple and has strong practicability, pile cap construction does not have a pile surrounding soil excavation backfilling process, the pile cap and the pile body are formed at one time, and the pile head is cleaned simply and quickly; and the operability is strong, the pile cap part drills to the design position, the lower pile body drills after the pin shaft between the pile cap drill bit and the drilling machine is removed, the concrete is poured into the pile body by adopting a pumping pressure pipe burying method to form the pile body at one time, the pile surrounding earth excavation backfilling procedure is omitted, and loose concrete at the pile head is cleaned before cushion layer construction.

5. The environment protection effect is good, the working procedures of excavating and backfilling tamping around the pile are not needed, and compared with pile head concrete cleaning and pile head cutting, the waste of concrete is reduced; meanwhile, the equipment is easy to reform, and has the environmental benefits of reducing water and soil loss, saving energy consumption and the like.

6. The cost can be practically reduced, the construction period is shortened, the construction procedure of the CFG pile is simplified, the pile cap and the pile body are separately constructed into one-step forming, and the construction efficiency is improved; the pile head cleaning loose concrete has the advantages that the cost is obviously reduced compared with pile head cutting, the construction period can be effectively saved, and the cost is obviously reduced; meanwhile, the construction process is safe and reliable, the construction quality is controllable, and the pile cap and the pile body are formed at one time, so that the concrete connection quality between the pile cap and the pile body is ensured. The invention is not only suitable for one-step molding of the CFG pile plain circular concrete pile cap and the pile body, but also can be suggested to be changed into a circular pile cap for use. The method can also be used for construction of variable-diameter CFG piles, and in order to better increase the connection between the pile cap and the pile body, drill slag is removed in time after pile forming, and reinforcing steel bars are inserted into the center of the pile. Therefore, the method has wide popularization and application prospects, and obvious economic and social benefits.

In conclusion, the pile cap forming device is reasonable in design, simple and convenient to operate and good in use effect, the pile cap drill bit and the drill bit guide frame are additionally arranged on the long spiral pile machine to form the pile cap construction device, the long spiral pile machine drill rod is adopted to drive the pile cap construction device to rotate to complete drilling of the pile cap forming hole, power equipment is not required to be additionally arranged, and the pile cap and pile body integrated construction process can be achieved.

The technical scheme of the invention is further described in detail through the drawings and the embodiments.

Drawings

Fig. 1 is a reference diagram of the usage state of the integrated construction device for the pile cap and the pile body of the CFG pile foundation of the present invention.

Fig. 2 is a schematic structural view of the pile cap construction device of the present invention.

Fig. 3 is a schematic structural view of the pile cap drill of the present invention.

Fig. 4 is a schematic plan view of a drill guide according to the present invention.

Fig. 5 is a schematic elevation view of a drill guide of the present invention.

Fig. 6 is a block diagram of a construction method for performing CFG pile cap and pile body integrated construction according to the present invention.

Fig. 7 is a schematic view of a construction state of the invention when drilling a pile body forming hole.

Fig. 8 is a schematic view of a construction state of the invention when drilling a pile cap forming hole.

Fig. 9 is a schematic view of a construction state of the present invention when a pile body concrete pouring construction is performed.

Fig. 10 is a schematic view of the construction state of the pile cap concrete pouring construction according to the present invention.

FIG. 11 is a view showing the power transmission member and the rotary pusher according to the present invention.

Reference numerals illustrate:

1-a drill guide; 2-pile cap drill bit; 3-clamping piece;

4-a fixed collar; 5-clamping grooves; 6, drilling a cylinder;

7-an auger blade; 8, a soil outlet; 9-a first connection plate;

10-a second connecting plate; 11-a vertical stop block; 12-a horizontal pin shaft;

13-lifting lugs; 14-hanging holes; 15-a long spiral pile machine;

15-1 of a drill rod; 15-2-upright posts; 15-3, a power head;

16-pile body; 17-pile cap; 18-a limiting ring;

19-a power transmission member; 20-rotating the pusher; 21-pile cap forming holes;

22-pile body forming holes; 23-a lifting rope.

Detailed Description

The integrated construction device for the pile cap and the pile body of the CFG pile foundation shown in fig. 1 comprises a long spiral pile machine 15 for constructing the constructed CFG pile and a pile cap construction device arranged on the long spiral pile machine 15; referring to fig. 2, the pile cap construction device comprises a pile cap drill bit 2 for performing hole forming construction on a pile cap 17 of a constructed CFG pile and a drill guide frame 1 for guiding the pile cap drill bit 2, wherein the drill guide frame 1 is arranged on the pile cap drill bit 2, the pile cap drill bit 2 is vertically arranged, and the drill guide frame 1 is horizontally arranged; as shown in fig. 10, the constructed CFG pile comprises a pile body 16 and a pile cap 17 coaxially arranged on the upper part of the pile body 16, wherein the pile body 16 and the pile cap 17 are connected into a whole, the cross sections of the pile body 16 and the pile cap 17 are circular, and the pile cap 17 and the pile body 16 are vertically arranged; the diameters of the pile bodies 16 are the same from bottom to top;

As shown in fig. 3, the pile cap drill bit 2 comprises a drill cylinder 6 and an auger blade 7 which is arranged on the outer side wall of the lower part of the drill cylinder 6 from top to bottom along the circumferential direction, the drill cylinder 6 is a cylindrical steel sleeve which is coaxially sleeved on a drill rod 15-1 of a long screw pile machine 15 from bottom to top and is driven by the drill rod 15-1 to synchronously rotate, a rotary pushing mechanism for pushing the drill cylinder 6 to synchronously rotate is arranged on the drill rod 15-1, and the vertical distance between the rotary pushing mechanism and the bottom end of the drill rod 15-1 is not greater than the height of the drill cylinder 6;

as shown in fig. 4 and 5, the drill guide 1 includes a fixing collar 4 coaxially sleeved on the drill cylinder 6 and a collar fixing member for mounting the fixing collar 4 on a pile frame of the long screw pile machine 15, wherein the fixing collar 4 and the collar fixing member are horizontally arranged, one end of the collar fixing member is connected with the fixing collar 4, and the other end of the collar fixing member is connected with the pile frame.

During actual use, the fixed lantern ring 4 guides the drilling cylinder 6, so that the drilling cylinder 6 (namely the pile cap drill bit 2) cannot radially move in the drilling process of the pile cap forming hole 21, on one hand, accurate hole positions of the pile cap forming hole 21 are ensured, and on the other hand, the drilling process of the pile cap forming hole 21 can be simply, continuously and effectively carried out.

In this embodiment, the drill rod 15-1 includes a core rod and a threaded blade disposed outside the core rod from bottom to top, the core rod is a cylindrical rod, the auger blade 7 is a threaded auger blade, and the threaded direction of the threaded blade is the same as that of the auger blade 7.

The screw blade and the auger blade 7 are both single screw. Therefore, the pile cap drill bit 2 has simple structure and convenient processing and manufacturing.

In this embodiment, the inner diameter of the drill cylinder 6 is larger than the outer diameter of the screw blade.

In this embodiment, the height of the fixing collar 4 is 0.8L to 1L, where L is the pitch of the screw blade. During actual use, the fixed lantern ring 4 is in clearance fit with the drill barrel 6, the inner diameter and the height of the fixed lantern ring 4 are limited respectively, so that the fixed lantern ring 4 can fully and effectively exert the guiding function on the drill barrel 6, meanwhile, the drill barrel 6 can be effectively protected through the fixed lantern ring 4, the strength of the drill barrel 6 is increased, and the drilling effect is further ensured.

The drilling cylinder 6 is connected to the pile frame through the collar fixing piece, the pile frame is used as an acting point for guiding the drill bit guide frame 1, no fixing facilities are needed to be additionally arranged on a construction site, labor and time are saved, and the fixing connection is simple, convenient and reliable. Simultaneously, the drill cylinder 6 is further limited by the collar fixing piece.

In this embodiment, the diameter of the pile cap 17 is the same from bottom to top, and the diameter of the pile body 16 is smaller than the diameter of the pile cap 17; the auger blade 7 is a helical blade, the outer diameter of the helical blade is the same as the diameter of the pile cap 17 from bottom to top, and the width of the helical blade is the same from bottom to top.

In actual construction, the diameter of the pile cap 17 can also be gradually increased from bottom to top, and the bottom diameter of the pile cap 17 is the same as the diameter of the pile body 16; the auger blade 7 is a helical blade, the outer diameter of the helical blade gradually increases from bottom to top, the outer diameter of the bottom of the helical blade is the same as the diameter of the pile body 16, and the width of the helical blade gradually increases from bottom to top. At this time, the pile cap drill 2 is a reducer drill. Thus, the pile cap drill 2 is very flexible in terms of use.

In this embodiment, the drill guide 1 is a movable guide that can vertically move up and down along the pile frame and drive the pile cap drill 2 to synchronously move up and down.

In this way, the drill guide 1 does not affect the drilling process of the pile cap drill 2 and the drill rod 15-1. On the one hand, the drill guide frame 1 does not have any influence on the axial rotation and up-and-down movement of the drill rod 15-1, and the pile cap construction device is installed on the long screw pile machine 15, but does not have any influence on the normal construction process of the long screw pile machine 15, and the long screw pile machine 15 is constructed according to a conventional construction method. On the other hand, the drill guide frame 1 can synchronously move up and down along with the pile cap drill bit 2, so that the drill guide frame 1 can guide and effectively protect the pile cap drill bit 2 (namely the drill cylinder 6) under any condition, and the drill guide frame 1 can move up and down along the pile frame, so that additional mobile equipment is not required to be additionally arranged, the cost can be effectively reduced, and the labor and time are saved.

In this embodiment, the fixing collar 4 is sleeved on the outer side of the upper part of the pile cap drill bit 2, and the auger blade 7 is positioned below the fixing collar 4; the upper outer side wall of the drill cylinder 6 is provided with a collar limiting piece for limiting the fixed collar 4, the collar limiting piece comprises an upper limiting piece and a lower limiting piece positioned right below the upper limiting piece, and the upper limiting piece and the lower limiting piece are horizontally distributed and both are fixed on the upper outer side wall of the drill cylinder 6; the fixed lantern ring 4 is a cylindrical lantern ring clamped between the upper limiting piece and the lower limiting piece.

In this embodiment, the upper and lower limiting members are limiting rings 18.

In actual processing, the upper limiting piece and the lower limiting piece can also adopt other types of limiting mechanisms.

According to common knowledge in the art, the long screw pile driver 15 comprises the pile frame and a drilling system, wherein the pile frame comprises a column 15-2 and a moving mechanism for driving the column 15-2 to move; the drilling system comprises a drilling tool and a power head 15-3 for driving the drilling tool, and a guide rail for the power head 15-3 to move up and down is arranged on the upright post.

The guide rail is arranged on the upright post 15-2, the moving mechanism is arranged at the bottom of the upright post 15-2, the power head 15-3 is arranged on the hoisting structure and is fixed on the upright post 15-2, and the power head 15-3 can move up and down along the guide rail. The power head 15-3 is a rotary driving and lifting device for driving the drill rod 15-1 to rotate and driving the drill rod to move up and down.

In this embodiment, the collar fixing element includes a clamping element 3 that is clamped on the guide rail and can move up and down along the guide rail, the fixing collar 4 and the clamping element 3 are connected and fixed by a connecting element, and the clamping element 3 and the connecting element are arranged on the same horizontal plane.

The lantern ring mounting can be directly clamped on the guide rail through the clamping piece 3, the direct installation is simple and convenient, the connection is reliable, and during design and processing, the structure of the clamping piece 3 is only required to be determined according to the structure of the guide rail, and the length of the connecting piece is determined according to the distance between the guide rail and the drill rod 15-1 and the outer diameter of the drill cylinder 6. Thus, the guide rail of the long screw pile machine 15 is effectively utilized, and the drill guide frame 1 moves up and down by utilizing the guide rail, so that the drill guide frame is simple and practical.

In this embodiment, the drill cylinder 6 is provided with a pushed member pushed by the rotary pushing mechanism.

In practical use, the rotary pushing mechanism can also be a pushing mechanism directly propped or clamped on the drill cylinder 6. For easy pushing, the drill cylinder 6 may also be provided with a supporting mechanism for supporting the rotary pushing mechanism or a clamping member for clamping the rotary pushing mechanism.

As shown in fig. 1 and 11, a plurality of power transmission members 19 are disposed on the top of the drill barrel 6 along the circumferential direction, and the rotary pushing mechanism includes a plurality of rotary pushing members 20 disposed on the screw blades and pushing the power transmission members 19, each power transmission member 19 is pushed by one rotary pushing member 20, and each rotary pushing member 20 is located at the rear side of the pushed power transmission member 19. In actual use, the rotary pushing members 20 are pushing members for pushing the power transmission member 19 from back to front. Thus, a plurality of the power transmission members 19 constitute the pushed member.

As shown in fig. 2 and 3, each power transmission piece 19 comprises a vertical stop block 11 fixed on the outer side of the top of the drill cylinder 6 and a horizontal pin shaft 12 arranged on the vertical stop block 11, and a through hole for inserting the horizontal pin shaft 12 is formed in the vertical stop block 11; the plurality of horizontal pins 12 are identical in structure and size, and the plurality of horizontal pins are identical in sizeThe pin shafts 12 are distributed along the circumferential direction, and the central axes of the pin shafts are intersected with the central axis of the drill cylinder 6; the horizontal distance between the inner end of each horizontal pin shaft 12 and the central axis of the drill cylinder 6 is larger than

Wherein d is the outer diameter of the core rod.

The number of the power transmission members 19 and the number of the rotary pushing members 20 are the same and the arrangement positions of the power transmission members and the rotary pushing members are in one-to-one correspondence. In actual processing, the number and arrangement positions of the power transmission member 19 and the rotary pushing member 20 can be adjusted accordingly according to specific requirements.

The horizontal pin 12 is a detachable connector. In this embodiment, the outer end of the horizontal pin shaft 12 is inserted into the vertical stop block 11, and the inner end of each horizontal pin shaft 12 is clamped at the front side of the rotary pushing member 20 for pushing the same.

In actual use, the inner end of the horizontal pin shaft 12 may be inserted into the rotary pushing member 20 for pushing the horizontal pin shaft 12, and the rotary pushing member 20 is provided with an insertion hole for inserting the horizontal pin shaft 12. In this way, the drill rod 15-1 is fastened to the drill cylinder 6 by a plurality of the rotary pushers 20 and a plurality of the power transmission members 19.

In the actual use process, when the rotary pushing mechanism is required to be in a pushing state, the drill rod 15-1 is connected with the pile cap drill bit 2 through the detachable connecting piece, and at the moment, the drill cylinder 6 is clamped on the outer side of the drill rod 15-1 or the drill cylinder 6 and the drill rod 15-1 are fastened and connected into a whole. When the connection between the drill rod 15-1 and the pile cap drill bit 2 is broken, only the detachable connecting piece is required to be detached.

Because the power transmission piece 19 is composed of the vertical stop block 11 and the horizontal pin shaft 12 arranged on the vertical stop block 11, the power transmission piece 19 is a detachable transmission piece, and after the horizontal pin shaft 12 is pulled out of the vertical stop block 11, the power transmission piece 19 does not swing the power transmission function any more, so that the practical operation is simple and convenient, and the use mode is flexible.

In this embodiment, the rotary pushing member 20 is a fixed block welded and fixed to the screw blade.

And the fixed block is a cylindrical steel block. In practical use, the fixing block can also be a block body with other shapes, such as a cube block and the like.

In this embodiment, the vertical stop block 11 is fixed on the upper limiting member, and a plurality of vertical stop blocks 11 are arranged along the edge line of the upper limiting member.

Thus, the actual fixing is simple and easy, and the vertical stop 11 does not have any influence on the drilling process of the drill rod 15-1 and the drill barrel 6, and at the same time does not have any influence on the guiding action of the drill guide 1.

In this embodiment, the power transmission members 19 are uniformly distributed on the same horizontal plane.

In this embodiment, the number of the power transmission members 19 and the number of the rotary pushing members 20 are two, the two rotary pushing members 20 are both fixed on one of the screw blades, the blade fixed by the rotary pushing members 20 is a fixed blade, one of the rotary pushing members 20 is located at the upper part of the fixed blade, and the other rotary pushing member 20 is located at the bottom of the fixed blade, so that after the horizontal pin shafts 12 are inserted into the two vertical stoppers 11, the two horizontal pin shafts 12 are inserted into the screw blades, and the two horizontal pin shafts 12 are respectively located at the upper side and the lower side of the fixed blade, and thus, when the two horizontal pin shafts 12 push the power transmission members 19 to enable the pile cap drill bit 2 to synchronously rotate along with the drill rod 15-1, the two horizontal pin shafts 12 form an axial limiting mechanism for axially limiting the drill rod 15-1, and thus, the pile cap drill bit 2 and the drill rod 15-1 can be simply and rapidly assembled into a whole, and simultaneously, the continuous downward drilling and effective drilling processes of the pile cap drill bit 2 can be ensured.

Simultaneously, the two horizontal pin shafts 12 and the vertical stop blocks 11 are combined to form an axial limiting mechanism for axially limiting the drill guide frame 1, so that the drill guide frame 1 is prevented from moving up and down in the working process, and the fixing effect is achieved; the drill guide 1 and the pile cap drill 2 can be moved up and down synchronously by the two horizontal pins 12.

In this embodiment, the bottom of the drill pipe 6 is flush with the bottom of the drill pipe 15-1.

In the process of drilling the pile cap forming hole 21, the pile cap drill bit 2 and the drill rod 15-1 synchronously drill from top to bottom, so that the drilling speed can be effectively increased, and meanwhile, the stability of drilling can be effectively increased.

In actual processing, the arrangement position of the rotary pushing member 20 on the drill rod 15-1 is determined according to the height of the drill barrel 6, so that the bottom of the drill barrel 6 is flush with the bottom of the drill rod 15-1 after the pile cap construction device is installed in the second step.

In this embodiment, the height of the auger blade 7 is the same as the height of the pile cap 17.

In this embodiment, the clamping member 3 includes two clamping claws symmetrically clamped on the guide rail and located on the same horizontal plane, the clamping claws are horizontally arranged, the front sides of the clamping claws are provided with clamping grooves 5 clamped on the guide rail, and the rear ends of the clamping claws are fixed on the connecting member.

In this embodiment, the clamping member 3 is annular and has a diameter Φ100mm, and the fixing collar 4 has an inner diameter Φ450mm and an outer diameter Φ560mm.

During actual use, the fixed lantern ring 4 clamps on the upper part of the drill cylinder 6, the drill guide frame 1 can move up and down, and meanwhile, the drill guide frame 1 can horizontally rotate around the guide rail, so that the device is very simple and convenient in actual operation, flexible in use and convenient to position, and can meet drilling requirements of pile holes in different pile positions.

In actual use, the processing materials of the drill tube 6 and the spiral drill 7 in the pile cap drill bit 2 are Q235, the yield value of the steel material is reduced along with the increase of the thickness of the material, and the steel material has moderate carbon content, good comprehensive performance, better cooperation of the performances of strength, plasticity, welding and the like in use and the most wide application.

During actual processing, the inner diameter of the drill pipe 6 is determined according to the outer diameter of the drill pipe 15-1 (namely, the outer diameter of the threaded blade), and the inner diameter of the drill pipe 6 is larger than the outer diameter of the drill pipe 15-1; the diameter of the auger blade 7 is determined according to the aperture of the pile cap forming hole 21, and the diameter of the auger blade 7 is consistent with the aperture of the pile cap forming hole 21; the outer diameter of the drill rod 15-1 (i.e., the outer diameter of the screw blade) is determined according to the diameter of the pile body forming hole 22, and the outer diameter of the drill rod 15-1 (i.e., the outer diameter of the screw blade) is identical to the diameter of the pile body forming hole 22.

In this embodiment, the height of the drill barrel 6 is 2000mm, and the height of the drill guide 1 (i.e., the fixing collar 4) is 235mm.

In actual processing, the heights of the drill barrel 6 and the drill guide 1 (i.e. the fixed collar 4) can be adjusted accordingly according to specific requirements. The inner diameter of the drill pipe 6 is 20mm to 50mm larger than the outer diameter of the drill pipe 15-1 (i.e., the outer diameter of the screw blade).

In this embodiment, the diameter of the core rod is Φ200mm, the outer diameter of the drill rod 15-1 (i.e. the outer diameter of the screw blade) is Φ400mm, the outer diameter of the drill barrel 6 is Φ445mm, the wall thickness of the drill barrel is 5 mm-10 mm, and the diameter of the auger blade 7 is Φ800mm.

In actual machining, the diameter of the core rod, the outer diameter of the drill rod 15-1 (i.e., the outer diameter of the screw blade), the outer diameter and wall thickness of the drill barrel 6, and the diameter of the auger blade 7 may be adjusted accordingly, respectively, as desired.

In this embodiment, the diameter of the horizontal pin 12 is Φ30mm.

In actual processing, the diameter of the horizontal pin shaft 12 can be correspondingly adjusted according to specific requirements.

In this embodiment, the blade of the auger blade 7 is formed by processing a steel plate with a thickness of 15mm, and the vertical stopper 11 is a steel plate with a thickness of 30mm. In actual processing, the thickness of the blade of the auger blade 7 and the thickness of the vertical stop block 11 can be respectively adjusted according to specific requirements.

In this embodiment, lifting lugs 13 are symmetrically arranged on the left and right sides of the fixed collar 4, and a lifting hole 14 through which a lifting rope passes is formed in the middle of the lifting lug 13.

In order to further determine the connection reliability, the pile cap construction device and the drill rod 15-1 can be lifted or lowered synchronously, and in actual use, the lifting lug 13 is connected with the lifting device (namely the power head 15-3) of the drill rod 15-1 through a steel wire rope (namely the lifting rope), and the vertical stop block 11, the horizontal pin shaft 12 and the lifting lug 13 are mutually matched, so that the relative movement of the drill guide frame 1 in the axial direction of the drill rod 15-1 is limited, and meanwhile, the drill guide frame 1 can be driven to move up and down through the power head 15-3, and accordingly the pile cap drill bit 2 is driven to move up and down synchronously. Therefore, the up-and-down moving process and the up-and-down moving direction of the pile cap drill bit 2 and the drill guide frame 1 are controlled by the power head 15-3, the implementation is simple and convenient, no additional driving equipment is needed, and the action is reliable.

In this embodiment, the connecting piece includes first connecting plate 9 and is the second connecting plate 10 that vertically lays with first connecting plate 9, clamping piece 3 and first connecting plate 9 fastening connection, second connecting plate 10 is the vertical layout and its level that lays with fixed lantern ring 4, through second connecting plate 10 fastening connection between first connecting plate 9 and the fixed lantern ring 4, through first connecting plate 9 fastening connection between clamping piece 3 and the second connecting plate 10, clamping piece 3 passes through the bolt fastening on first connecting plate 9.

In actual use, the first connecting plate 9 and the second connecting plate 10 are fixedly connected through the reinforcing plate.

In this embodiment, the middle part of the drill cylinder 6 is provided with a soil outlet 8, and the soil outlet 8 is located above the auger blade 7. And, the soil outlet 8 is located between the fixed collar 4 and the auger blade 7.

In this embodiment, the number of the soil outlets 8 is two, and the two soil outlets 8 include a front soil outlet arranged on the front side of the middle of the drill cylinder 6 and a rear soil outlet arranged on the rear side of the middle of the drill cylinder 6, where the height of the front soil outlet is higher than that of the rear soil outlet, that is, the front soil outlet and the rear soil outlet are asymmetrically arranged, so that the soil outlets on the front side and the rear side of the pile cap drill bit 2 are not affected.

When in actual use, the front soil outlet and the rear soil outlet are square openings, and the sizes of the front soil outlet and the rear soil outlet are the same. In this embodiment, the height of the soil outlet 8 is 250mm and the width thereof is 200mm, and the shape and size of the soil outlet 8 can be adjusted according to specific needs during actual processing.

The integrated construction method of the CFG pile cap and the pile body shown in fig. 6 comprises the following steps:

step one, positioning a drilling machine: moving the long screw pile machine 15 to a construction area of the constructed CFG pile, and enabling the drill rod 15-1 to be positioned right above the pile position of the constructed CFG pile;

Step two, pile cap construction device and power transmission piece installation: installing the pile cap construction device on the long screw pile driver 15 which moves in place in the first step, simultaneously installing a plurality of power transmission parts 19 on the top of the drilling barrel 6, and vertically moving the drill rod 15-1 downwards until each rotary pushing part 20 is positioned at the rear side of the pushed power transmission part 19, wherein the drill rod 15-1 and the pile cap construction device form a pile cap drilling pore-forming device;

drilling a pile cap forming hole: drilling the hole forming device from top to bottom by adopting the pile cap drilling hole forming device in the second step to obtain a pile cap forming hole 21 formed by construction, and the detail is shown in fig. 7;

in the drilling process of the pile cap drilling hole forming device from top to bottom, a drill rod 15-1 is adopted to drill from top to bottom; in the process of drilling the drill rod 15-1 from top to bottom, the rotary pushing mechanism pushes the drill cylinder 6 to synchronously drill from top to bottom;

drilling a pile body forming hole: removing the power transmission parts 19 in the second step, and continuing to drill from top to bottom by adopting the drill rod 15-1 to obtain a pile body forming hole 22 formed by construction, as shown in fig. 8;

step five, lifting the drill and synchronously pouring concrete of the pile body: lifting the drill rod 15-1 upwards until the bottom of the drill rod 15-1 is flush with the bottom of the pile cap forming hole 21; in the upward lifting process, grouting equipment is adopted, concrete is synchronously poured into the pile body forming hole 22 from bottom to top through a drill rod 15-1, and the concrete pouring construction process of the pile body 16 is completed, and the concrete pouring construction process is shown in fig. 9 in detail;

The grouting equipment is connected with the upper end of the drill rod 15-1 through a grouting pipeline;

step six, lifting the drill and synchronously pouring concrete of the pile cap: lifting the drill rod 15-1 upwards until the drill rod 15-1 is lifted out of the pile cap forming hole 21; in the upward lifting process, the grouting equipment is adopted, concrete is synchronously poured into the pile cap forming hole 21 from bottom to top through the drill rod 15-1, and the concrete pouring construction process of the pile cap 17 is completed, and the concrete pouring construction process is shown in fig. 10 in detail. And (3) after the concrete poured in the fifth step and the sixth step is finally solidified, obtaining the CFG pile formed by construction, and the CFG pile is shown in fig. 10.

In the second embodiment, when the plurality of power transmission members 19 are installed on the top of the drill barrel 6, the horizontal pin shaft 12 is inserted into each of the vertical stoppers 11, and the inserted horizontal pin shaft 12 is located at the front side of one of the rotary pushing members 20;

in the fourth step, when the power transmission members 19 are removed, the horizontal pin shafts 12 are pulled out from the vertical stop blocks 11;

step six, before the synchronous pouring construction of the lifting drill and the pile cap concrete, the pile cap construction device is lifted from the pile cap forming hole 21 from bottom to top; or in the sixth step, in the construction process of carrying out the lifting and drilling and pile cap concrete synchronous pouring, the pile cap construction device and the drill rod 15-1 are synchronously lifted from bottom to top.

In this embodiment, before the drill pipe 15-1 is lifted upwards in the fifth step, the grouting device fills the drill pipe 15-1 with concrete.

In the fifth step, when the drill rod 15-1 is lifted upwards, the drill rod 15-1 is lifted upwards at a constant speed, and the lifting speed is 2 m/min-3 m/min; and step six, when the drill rod 15-1 is lifted upwards, the drill rod 15-1 is lifted upwards at a constant speed, and the lifting speed is smaller than that of the drill rod 15-1 in step five.

In the first step, after the long screw pile machine 15 is moved to the construction area of the constructed CFG pile, the drill rod 15-1 is lifted upwards, and the vertical distance between the bottom of the drill rod 15-1 and the ground is made to be greater than the height of the drilling barrel 6.

In this embodiment, two lifting lugs 13 are symmetrically arranged on the outer side of the fixed collar 4 in the pile cap construction device, a lifting hole 14 through which a lifting rope 23 passes is formed in the middle of the lifting lug 13, and the bottom of the lifting rope 23 is bound and fixed on the lifting lug 13;

after the pile cap construction device is installed on the long spiral pile machine 15, fixing the upper parts of the two lifting ropes 23 on the power head 15-3 of the long spiral pile machine 15, and lifting the pile cap construction device below the power head 15-3 through the two lifting ropes 23;

and step three, before drilling the pile cap forming hole, synchronously lowering the pile cap construction device and the drill rod 15-1 until the bottom of the drill cylinder 6 is supported on the ground.

In the fourth step, when the power transmission members 19 in the second step are removed, the upper parts of the two lifting ropes 23 are detached from the power head 15-3 so as to disconnect the pile cap construction device from the power head 15-3;

and step six, before the drill rod 15-1 is lifted upwards, fixing the upper parts of the two lifting ropes 23 on the power head 15-3, and then lifting the pile cap construction device and the drill rod 15-1 synchronously from bottom to top.

From the above, it can be seen that the present invention modifies the conventionally used long screw pile machine 15, specifically, the pile cap drill bit 2 and the drill guide 1 in the pile cap construction device are processed according to the size of the pile cap forming hole 21 and in combination with the outer diameter of the drill pipe 15-1 and the distance between the drill pipe 15-1 and the guide rail. And then the processed pile cap construction device is mounted on a long screw pile machine 15, during actual mounting, a drill rod 15-1 is lifted upwards until the vertical distance from the bottom of the drill rod 15-1 to the ground is larger than the height of a drilling cylinder 6, then the pile cap construction device is lifted to the position right below the drill rod 15-1 by adopting lifting equipment, a drill guide frame 1 is clamped on a guide rail (also called a sliding rail, namely round steel pipes on two sides of the pile frame) through a clamping piece 3, a pile cap drill bit is temporarily mounted on the drill rod 15-1 through the cooperation of a rotary pushing piece 20 and a power transmission piece 19, and meanwhile, the drill guide frame 1 is connected with a power head 15-3 through a lifting rope.

During actual construction, after the horizontal bolt 12 is inserted into the vertical stop block 11, the long screw pile machine 15 can synchronously drive the pile cap drill bit 2 to drill from top to bottom while drilling; after the pile is drilled to the bottom design elevation of the pile cap 17, the horizontal bolt 12 is pulled out, and the long spiral pile machine 15 continues to drill to the bottom design elevation of the pile body 16; then, controlling the long spiral pile machine 15 (namely the drill rod 15-1) to reversely rotate, lifting the drill rod 15-1 upwards at a constant speed, and synchronously pouring concrete to the bottom design elevation of the pile cap 17 in the process of lifting the drill rod 15-1 upwards at a constant speed; then, as the pile diameter is increased, the lifting speed of the drill rod 15-1 is reduced, the drill rod 15-1 and the pile cap construction device are synchronously lifted upwards at a uniform speed, and the one-time construction process of the pile cap and the pile body is completed; finally, the drilling slag is removed in time, and the equipment is cleaned.

For simple installation, when the pile cap construction device is installed, the clamping piece 3 is detached from the connecting piece, and then the clamping piece 3 is lifted by lifting equipment (such as a winch and the like) and aligned with the guide rail until the clamping piece 3 is clamped on the guide rail, so that the installation process of the clamping piece 3 is completed. Then, hoisting the pile cap construction device with the clamping piece 3 removed to the position below the drill rod 15-1 by using a hoisting device (such as an automobile crane or a digger), and enabling the drill cylinder 6 to be positioned right below the drill rod 15-1; then, the drill rod 15-1 is lowered or the pile cap construction device with the clamping piece 3 removed is lifted vertically upwards, the drill cylinder 6 is sleeved on the drill rod 15-1, and meanwhile the connecting piece in the pile cap construction device is fastened and connected with the pre-installed clamping piece 3, so that the installation process of the pile cap construction device is completed.

In this embodiment, for easy installation, the fixing collar 4 may be formed by buckling two symmetrically arranged semicircular rings. In actual installation, the two semicircular rings are sleeved on the upper part of the drill cylinder 6 and are fastened and connected to form the fixed lantern ring 4.

In order to facilitate smooth lifting and rotation of the pile cap drill bit 2, butter is smeared on the pylon slide rail (namely the guide rail) and the inner wall of the fixed sleeve ring 4, and the butter is timely smeared in the construction process.

In order to avoid dropping or losing the horizontal pin shaft 12, the horizontal pin shaft 12 is connected to the pile cap drill bit 2 (specifically the drill drum 6) by a thin steel wire rope, and the horizontal pin shaft 12 can be conveniently assembled and disassembled. In this embodiment, the horizontal pin shaft 12 is made of 45 # steel.

And firstly, paying off measurement is carried out on pile positions of the constructed CFG piles before the drilling machine is in place. The measured pile positions are marked by wood piles, bamboo sheet piles or lime dots. After the drilling machine is in place, the verticality of the drill rod 15-1 is corrected and adjusted through the hammer balls at the two sides of the drilling machine, and in order to accurately control the depth of the constructed CFG pile, a scale for controlling the depth is made on the pile frame, wherein the scale comprises a control mark at the bottom of the pile cap 17.

In this embodiment, the horizontal pin shaft 12 is not inserted when the pile cap construction device and the power transmission member are mounted in the second step.

And in the third step, when the pile cap forming hole is drilled, and when the bottom of the drilling barrel 6 contacts the ground, after the horizontal pin shaft 12 is inserted, the power head 15-3 is started, the long spiral pile machine 15 slowly rotates forward and drives the pile cap drill bit 2 to drill into the soil, so that the shaking of the drill rod 15-1 is reduced, and the eccentric hole is prevented.

When drilling is performed to the designed elevation at the bottom of the pile cap 17, closing the power head 15-3, and pulling out the horizontal pin shaft 12; and then, the power head 15-3 continuously drills and discharges the soil to the designed elevation of the bottom design elevation of the pile body 16. In the drilling process, a holding force value is determined according to a current value determined by the test pile, and when the drilling process shakes too much, the footage is slowed down.

And fifthly, the poured concrete in the step five and the step six is intensively mixed by adopting a mixing station, a concrete transport vehicle is transported to a construction site, and the transport vehicle is configured according to the distance between the construction site and the mixing station and the pile foundation construction progress. The mixing time of each disc of concrete is not less than 120s; the slump is controlled between 16s and 20s.

And fifthly, pouring a mixture (namely concrete) by adopting a pumping method in a pipe (namely the core rod) during concrete pouring in the step six, starting to lift the drill rod 15-1 when the drill rod core pipe (namely the core rod) is full of the mixture, wherein the lifting speed is 2 m/min-3 m/min, and strictly prohibiting the drill rod 15-1 from being lifted and then pumping. When the lifting drill rod 15-1 is lifted to approach the bottom design elevation of the pile cap 17, the lifting speed is reduced, and pile cap concrete pouring is performed.

After the construction is completed, the long spiral pile machine 15 is shifted to the construction position of the next pile for construction, and the pile position is rechecked before the next pile construction due to the influence of site personnel, pipelines and soil discharge of the upper pile.

And (3) drill slag cleaning: in order to avoid pile breakage caused by the cleaning of drill slag after the initial setting of the concrete of the pile body 16, a digger and 1-2 soil-moving vehicles are arranged on site, and the drill slag is cleaned and moved to a waste soil field for stacking in time.

Pile cap cleaning and pile periphery treatment: after the concrete of the pile body 16 reaches the 28d age, manually cleaning loose soil on the top surface of the pile cap, and the like, and cleaning the loose concrete on the top surface of the pile by adopting an electric hammer. And (3) leveling the surface of the construction site by using a small excavator, and tightly preventing the excavator crawler from touching the pile body when the excavator crawler walks along the center of the pile. And tamping and leveling the soil around the piles by adopting a small rammer after leveling the field.

When the temperature reaches the condition of winter construction, the winter construction is carried out, measures are taken to avoid freezing the concrete before initial setting, and part of drilling slag is left to cover the top surface of the pile foundation for covering and heat preservation during cleaning the drilling slag.

When the drill rod 15-1 drills to the designed elevation or bearing layer at the bottom of the pile body 16 in actual construction, concrete starts to be pumped into the drill rod core tube (namely the core rod), air in the drill rod core tube (namely the core rod) is discharged from the exhaust valve, the drill rod core tube and the conveying pipe are filled with concrete and are continuous, and then the drill rod 15-1 is lifted in time, so that the concrete is guaranteed to be poured into piles under certain pressure. In order to avoid the formation of a cavity of the pile body caused by the incapability of exhausting air in the drill pipe core pipe, the exhaust valve is frequently checked to be blocked during construction, and measures are taken in time to clean if the blocking occurs. Thus, the upper end of the drill rod 15-1 is provided with an exhaust pipe, on which an exhaust valve is mounted.

The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any simple modification, variation and equivalent structural changes made to the above embodiment according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. CFG pile foundation pile cap and pile shaft integration construction equipment, its characterized in that: the pile cap construction device comprises a long spiral pile machine (15) for constructing the constructed CFG pile and a pile cap construction device arranged on the long spiral pile machine (15), wherein the pile cap construction device comprises a pile cap drill bit (2) for performing hole forming construction on a pile cap (17) of the constructed CFG pile and a drill guide frame (1) for guiding the pile cap drill bit (2), the drill guide frame (1) is arranged on the pile cap drill bit (2), the pile cap drill bit (2) is vertically arranged, and the drill guide frame (1) is horizontally arranged; the constructed CFG pile comprises a pile body (16) and a pile cap (17) coaxially arranged at the upper part of the pile body (16), wherein the pile body (16) and the pile cap (17) are connected into a whole, the cross sections of the pile body and the pile cap (17) are round, and the pile cap (17) and the pile body (16) are vertically arranged; the diameters of the pile bodies (16) are the same from bottom to top;

the pile cap drill bit (2) comprises a drill cylinder (6) and an auger blade (7) which is arranged on the outer side wall of the lower part of the drill cylinder (6) from top to bottom along the circumferential direction, the drill cylinder (6) is a cylindrical steel sleeve which is coaxially sleeved on a drill rod (15-1) of a long spiral pile machine (15) from bottom to top and is driven by the drill rod (15-1) to synchronously rotate, the drill rod (15-1) is provided with a rotary pushing mechanism for pushing the drill cylinder (6) to synchronously rotate, and the vertical distance between the rotary pushing mechanism and the bottom end of the drill rod (15-1) is not larger than the height of the drill cylinder (6);

The drill guide frame (1) comprises a fixed sleeve ring (4) coaxially sleeved on a drill cylinder (6) and a sleeve ring fixing piece for mounting the fixed sleeve ring (4) on a pile frame of a long spiral pile machine (15), wherein the fixed sleeve ring (4) and the sleeve ring fixing piece are horizontally arranged, one end of the sleeve ring fixing piece is connected with the fixed sleeve ring (4), and the other end of the sleeve ring fixing piece is connected with the pile frame.

2. The CFG pile cap and shaft integrated construction device according to claim 1, wherein: the diameters of the pile caps (17) are the same from bottom to top, and the diameter of the pile body (16) is smaller than the diameter of the pile caps (17); the auger blade (7) is a helical blade, the outer diameters of the helical blade are the same from bottom to top, the outer diameter of the helical blade is the same as the diameter of the pile cap (17), and the widths of the helical blade are the same from bottom to top.

3. The CFG pile cap and shaft integrated construction device according to claim 1, wherein: the diameter of the pile cap (17) is gradually increased from bottom to top, and the bottom diameter of the pile cap (17) is the same as the diameter of the pile body (16); the auger blade (7) is a spiral blade, the outer diameter of the auger blade is gradually increased from bottom to top, the outer diameter of the bottom of the spiral blade is the same as the diameter of the pile body (16), and the width of the spiral blade is gradually increased from bottom to top.

4. A CFG pile cap and shaft integrated construction apparatus according to claim 1, 2 or 3, wherein: the drill guide frame (1) is a movable guide frame capable of vertically moving up and down along the pile frame and driving the pile cap drill bit (2) to synchronously move up and down, the fixed sleeve ring (4) is sleeved on the outer side of the upper part of the pile cap drill bit (2), and the spiral drill knife (7) is positioned below the fixed sleeve ring (4); the upper outer side wall of the drill cylinder (6) is provided with a collar limiting piece for limiting the fixed collar (4), the collar limiting piece comprises an upper limiting piece and a lower limiting piece positioned right below the upper limiting piece, and the upper limiting piece and the lower limiting piece are horizontally distributed and both are fixed on the upper outer side wall of the drill cylinder (6); the fixed lantern ring (4) is a cylindrical lantern ring clamped between the upper limiting piece and the lower limiting piece.

5. The CFG pile cap and pile body integrated construction device according to claim 4, wherein: the long spiral pile machine (15) comprises a pile frame and a drilling system, wherein the pile frame comprises a stand column (15-2) and a moving mechanism for driving the stand column (15-2) to move; the drilling system comprises a drilling tool and a power head (15-3) for driving the drilling tool, and a guide rail for the power head (15-3) to move up and down is arranged on the upright post;

The lantern ring mounting comprises a clamping piece (3) which is clamped on the guide rail and can move up and down along the guide rail, the fixed lantern ring (4) and the clamping piece (3) are connected and fixed through a connecting piece, and the clamping piece (3) and the connecting piece are distributed on the same horizontal plane.

6. A CFG pile cap and shaft integrated construction apparatus according to claim 1, 2 or 3, wherein: the drill rod (15-1) comprises a core rod and screw thread blades which are arranged outside the core rod from bottom to top, the core rod is a cylindrical rod, the screw drill (7) is a screw thread drill, and the screw thread blades and the screw drill (7) have the same screw thread direction;

the top of a drill cylinder (6) is provided with a plurality of power transmission members (19) along the circumferential direction, the rotary pushing mechanism comprises a plurality of rotary pushing members (20) which are arranged on the threaded blades and push the power transmission members (19), each power transmission member (19) is pushed by one rotary pushing member (20), and each rotary pushing member (20) is positioned at the rear side of the pushed power transmission member (19).

7. The CFG pile cap and pile body integrated construction device according to claim 6, wherein: the power transmission parts (19) are uniformly distributed on the same horizontal plane; each power transmission piece (19) comprises a vertical stop block (11) fixed on the outer side of the top of the drill cylinder (6) and a horizontal pin shaft (12) arranged on the vertical stop block (11), and the vertical stop blocks (11) are provided with through holes for inserting the horizontal pin shafts (12); the structure and the size of the plurality of horizontal pin shafts (12) are the same, the plurality of horizontal pin shafts (12) are distributed along the circumferential direction, and the central axes of the horizontal pin shafts (12) are intersected with the central axis of the drilling barrel (6); the horizontal distance between the inner end of each horizontal pin shaft (12) and the central axis of the drill cylinder (6) is larger than

Wherein d is the outer diameter of the core rod.

8. A method for performing CFG pile cap and shaft integrated construction by using the device of claim 6, comprising the steps of:

step one, positioning a drilling machine: moving the long spiral pile machine (15) to a construction area of the constructed CFG pile, and enabling the drill rod (15-1) to be positioned right above the pile position of the constructed CFG pile;

step two, pile cap construction device and power transmission piece installation: installing the pile cap construction device on the long screw pile driver (15) which moves in place in the first step, simultaneously installing a plurality of power transmission parts (19) on the top of the drilling barrel (6), and vertically moving the drill rod (15-1) downwards until each rotary pushing part (20) is positioned at the rear side of the pushed power transmission part (19), wherein the drill rod (15-1) and the pile cap construction device form a pile cap drilling hole forming device;

drilling a pile cap forming hole: drilling a hole forming device by adopting the pile cap drilling in the second step from top to bottom to obtain a pile cap forming hole (21) formed by construction;

in the drilling process of the pile cap drilling hole forming device from top to bottom, a drill rod (15-1) is adopted to drill from top to bottom; in the process of drilling from top to bottom, the drill rod (15-1) pushes the drill cylinder (6) to synchronously drill from top to bottom through the rotary pushing mechanism;

Drilling a pile body forming hole: removing the power transmission parts (19) in the second step, and continuously drilling from top to bottom by adopting a drill rod (15-1) to obtain a pile body forming hole (22) formed by construction;

step five, lifting the drill and synchronously pouring concrete of the pile body: lifting the drill rod (15-1) upwards until the bottom of the drill rod (15-1) is level with the bottom of the pile cap forming hole (21); in the upward lifting process, grouting equipment is adopted, and concrete is synchronously poured into the pile body forming hole (22) from bottom to top through a drill rod (15-1), so that the concrete pouring construction process of the pile body (16) is completed;

the grouting equipment is connected with the upper end of the drill rod (15-1) through a grouting pipeline;

step six, lifting the drill and synchronously pouring concrete of the pile cap: lifting the drill rod (15-1) upwards until the drill rod (15-1) is lifted out of the pile cap forming hole (21); and in the upward lifting process, the grouting equipment is adopted, and concrete is synchronously poured into the pile cap forming hole (21) from bottom to top through the drill rod (15-1), so that the concrete pouring construction process of the pile cap (17) is completed.

9. The method according to claim 8, wherein: in the second step, a plurality of power transmission parts (19) are uniformly distributed on the same horizontal plane; each power transmission piece (19) comprises a vertical stop block (11) fixed on the outer side of the top of the drill cylinder (6) and a horizontal pin shaft (12) arranged on the vertical stop block (11), and the vertical stop blocks (11) are provided with through holes for inserting the horizontal pin shafts (12); the structure and the size of a plurality of the horizontal pin shafts (12) are the same The horizontal pin shafts (12) are distributed along the circumferential direction, and the central axes of the horizontal pin shafts are intersected with the central axis of the drilling barrel (6); the horizontal distance between the inner end of each horizontal pin shaft (12) and the central axis of the drill cylinder (6) is larger than

Wherein d is the outer diameter of the core rod;

the bottom of a drill rod (15-1) in the pile cap drilling pore-forming device is level with the bottom of a drill cylinder (6);

in the second step, when a plurality of power transmission parts (19) are arranged on the top of the drilling barrel (6), a horizontal pin shaft (12) is inserted into each vertical stop block (11), and the inserted horizontal pin shaft (12) is positioned at the front side of one rotary pushing part (20);

in the fourth step, when the power transmission parts (19) are all removed, the horizontal pin shafts (12) are all pulled out of the vertical stop blocks (11);

step six, before the synchronous pouring construction of the lifting drill and the pile cap concrete, the pile cap construction device is lifted from the pile cap forming hole (21) from bottom to top; or in the sixth step, in the synchronous grouting construction process of the drilling and pile cap concrete, the pile cap construction device and the drill rod (15-1) are synchronously lifted from bottom to top.

10. The method according to claim 8, wherein: before the drill rod (15-1) is lifted upwards in the fifth step, filling the drill rod (15-1) with concrete through the grouting equipment;

In the fifth step, when the drill rod (15-1) is lifted upwards, the drill rod (15-1) is lifted upwards at a constant speed, and the lifting speed is 2-3 m/min; when the drill rod (15-1) is lifted upwards in the step six, the drill rod (15-1) is lifted upwards at a constant speed, and the lifting speed is smaller than the lifting speed of the drill rod (15-1) in the step five;

after the long spiral pile machine (15) is moved to a construction area of the constructed CFG pile, lifting the drill rod (15-1) upwards, and enabling the vertical distance between the bottom of the drill rod (15-1) and the ground to be larger than the height of the drilling barrel (6);

two lifting lugs (13) are symmetrically arranged on the outer side of the fixed lantern ring (4) in the pile cap construction device, a lifting hole (14) for a lifting rope (23) to pass through is formed in the middle of each lifting lug (13), and the bottom of each lifting rope (23) is bound and fixed on each lifting lug (13);

after the pile cap construction device is installed on the long spiral pile machine (15), fixing the upper parts of the two lifting ropes (23) on a power head (15-3) of the long spiral pile machine (15), and hoisting the pile cap construction device below the power head (15-3) through the two lifting ropes (23);

synchronously lowering the pile cap construction device and the drill rod (15-1) until the bottom of the drill cylinder (6) is supported on the ground before drilling the pile cap forming hole;

In the fourth step, when the power transmission parts (19) in the second step are all dismantled, the upper parts of the two lifting ropes (23) are detached from the power head (15-3) so as to disconnect the pile cap construction device from the power head (15-3);

and step six, before the drill rod (15-1) is lifted upwards, fixing the upper parts of the two lifting ropes (23) on the power head (15-3), and lifting the pile cap construction device and the drill rod (15-1) synchronously from bottom to top.