CN114412353A - A self-propelled drilling rig and its construction method - Google Patents

Abstract

A self-walking drilling machine comprises a crawler chassis, a mast, a power head, a lifting oil cylinder, a rotary speed reducer, a drill rod dismounting device, a plurality of sections of drill rods and a drill bit; the mast is fixedly arranged in front of the chassis of the host machine; the bottom flange ring is vertical to the bottom of the mast; the power head is arranged on the mast guide rail; the lifting oil cylinder is hinged with the guide pile casing and the mast; the rotary speed reducer is fixedly arranged below the bottom flange ring; the drill rod dismounting device is fixedly mounted with the rotary speed reducer; the butt joint and the upper joint and the lower joint of the drill rod are provided with joint notches; the short fork plate is arranged on the backing plate, and the bayonet in the short fork plate is inserted into the joint notch of the lower joint; the long fork plate is arranged at the flange ring at the bottom, and the inner bayonet of the long fork plate is inserted into the joint notch of the butt joint. The construction method comprises the steps of installing and positioning the self-walking drilling machine, connecting the drill rod and the drill bit, digging in the soil, stirring and grouting, standing and maintaining the cast-in-place pile and the like. The invention has the characteristics of low clear height, flexible movement, convenient assembly and disassembly and the like, meets the construction requirement of the area with limited height and improves the construction efficiency of the cast-in-place pile.

Description

A self-propelled drilling rig and its construction method

technical field

The invention belongs to the technical field of construction machinery, and particularly relates to a self-propelled drilling rig and a construction method thereof.

Background technique

In the existing urban rail transit, urban center building cast-in-place pile construction and foundation reinforcement treatment projects, there are often structures above the construction site, encountering high-voltage power facilities, construction under communication lines or under bridges, and working conditions adjacent to existing buildings. , Due to the limited construction height and the surrounding environment, the operation of the drill pipe is very frequent during the construction of the pile foundation. During the downward drilling and mixing process of the drilling rig, the drilling tool and its ancillary equipment often require a high construction space, and the traditional walking Due to the tall mast and large footprint, the rig cannot enter the construction site or approach the existing building. Therefore, in the face of such a complex surrounding environment, the measures taken by construction companies are generally to negotiate with the power grid and communication departments to temporarily cut off the power grid and communication network lines above the pile foundation construction area, and then connect the power grid after the pile foundation construction is completed. It is connected to the line, which will result in a great consumption of construction schedule and construction cost. However, when the negotiation fails, the only option is to change the design scheme of pile foundation construction or foundation treatment, which will seriously affect the construction progress and cause a lot of waste of resources. Therefore, it is necessary to develop a low-headroom drilling rig and its construction method that is easy to move, easy to attach and disassemble the drilling tool and its construction method, which is suitable for the drilling rig to be poured in areas where the height of the construction site is limited, adjacent to the surrounding existing buildings and areas that are greatly affected by the surrounding environment. Pile construction and foundation reinforcement treatment construction.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to overcome the shortcomings of the prior art, and to provide a self-propelled drilling rig and its construction method that is convenient to move, simple in structure, convenient for docking and disassembly, and reliable in hole-forming. It can realize fast drilling and mixing construction, and improve the operation efficiency of cast-in-place pile construction and foundation reinforcement treatment in low headroom areas.

The self-propelled drilling rig adopted by the present invention to solve the technical problem includes a crawler chassis, a mast, a power head, a lifting oil cylinder, two struts, a rotary reducer, a drill pipe dismantling device, a multi-section drill pipe with an upper joint and a lower joint, A drill bit with an upper joint; wherein: the crawler chassis includes a chassis bracket with a front end support, two upper supports, four corner supports and four side supports, four links, four extension arms and four 1 outriggers; the mast includes a bottom section mast with bottom flange ring, lower mast support, two lower rails and mast side lugs, and an upper mast with two upper rails; the power head includes a gear box, an output shaft, with a joint a notch, a butt joint with right-handed conical internal thread, two guide frames and two guide guards located at the rear end of the reduction box respectively; the drill pipe disassembly device includes a short fork plate with an inner bayonet, an inner bayonet, a handle The long fork plate and the backing plate with four guide blocks; the upper joint of the drill pipe includes a joint slot and right-handed conical external thread; the lower joint of the drill pipe includes a joint slot and a right-handed conical internal thread; the upper joint of the drill bit Including joint slot, right-handed conical male thread;

It is characterized by:

The chassis support of the crawler chassis is a rectangular frame member; the front end support is arranged in the center of the front end of the chassis support; the upper support is arranged on the upper end surface of the chassis support in a left-right symmetrical manner; the corner support It is arranged at the four corners of the chassis bracket; the side supports are arranged on the left and right sides of the chassis bracket in a group of two; One end is hingedly installed on each corner support of the chassis bracket, and the other end is fixedly installed with a leg; the connecting rod is hingedly connected with each side support of the chassis bracket and the spread arm fork seat of each extension arm;

The mast is fixedly installed in front of the mainframe chassis, and is hingedly connected to the front end support of the chassis support through the mast lower support of the bottom mast; the upper mast is fixed above the bottom mast; the bottom mast After docking with the upper mast, their lower guide rail and upper guide rail form the guide rail of the mast; the bottom flange ring of the bottom mast is vertically arranged at the bottom thereof;

The support rods are arranged on the two sides of the bottom mast and are respectively hingedly connected with the side supports of the bottom mast and the two upper supports of the chassis support;

The power head is placed in front of the mast, and it is respectively placed on the two guide rails of the mast through the two guide frames of the reduction box; The protective cylinders are respectively fixed on the outer sides of the two guide frames; the butt joint is fixed on the lower end of the output shaft of the power head; a multi-section drill pipe and a drill bit are sequentially connected below the butt joint, and during the forward rotation process of the power head Lock the upper joint and the butt joint of the drill pipe, the lower joint of the upper section of the drill pipe and the upper joint of the lower section of the drill pipe, until the last section of the drill pipe and the external drill bit are locked; operate the power head along the mast The two guide rails go down, and the multi-section drill pipes and drill bits connected to the joints pass through the bottom flange ring of the bottom mast, the inner cavity of the rotary reducer, and the through hole of the backing plate, and then enter the bottom layer and drill to the design. Required hole depth;

The lifting oil cylinders are respectively arranged in the manner of passing through two guide shields of the power head, and the cylinder ends and the piston rods are hingedly installed with the bottom of the guide shields and the mast side ear seats on both sides of the mast of the bottom section;

The rotary reducer is fixedly mounted on the lower end face of the bottom flange ring of the bottom mast of the mast;

The backing plate of the drill rod dismantling device is fixedly mounted on the rotary ring of the lower end face of the rotary reducer, and the four guide blocks of the backing plate are located in the inner cavity of the rotary reducer; the four guiding blocks of the backing plate are rectangular in shape. The arrangement is arranged on the end face other than the through hole;

After the multi-section drill pipe reaches the hole-forming depth required by the design, the power head is turned off to stop the forward rotation of the multi-section drill pipe, and the inner bayonet of the short fork plate is aligned with the upper part of the lower section of the drill pipe. The joint slot of the joint is inserted, and after passing through the inner cavity of the rotary reducer, it is placed in the area enclosed by the four guide blocks on the backing plate, and the lower section of drill pipe is locked; The inner bayonet is inserted into the joint notch of the butt joint of the power head, and its handle is placed at the upper end face of the bottom flange ring of the bottom section of the mast to lock the joint.

According to the present invention, two or three spreader fork bases of the spreader arm are provided.

The present invention can also be that the lifting oil cylinder adopts the type of multi-section telescopic hydraulic cylinder.

In the present invention, the thickness of the short fork plate is greater than the height of the four guide blocks of the backing plate.

In addition, the present invention provides the construction method of the above-mentioned self-propelled drilling rig, comprising the following steps:

1) Install the self-propelled drilling rig in place, a) Clean up the construction site, ensure that the construction area is flat and avoid high-voltage cables; b) Move the crawler chassis on which the mast, slewing reducer and pad are installed to the construction area, and use a crane to remove Install two struts after the mast is vertical, and install the power head and lifting cylinder in front of the mast; connect the extension cylinder of the outrigger, the hydraulic hose of the lifting cylinder, connect the power cable of the power head, and inject the external grouting system The grouting pipeline is firmly connected with the grouting port of the power head; c) Manipulate the self-propelled drilling rig to move to the drilling station, open the extension arm of the crawler chassis to the outside, and lock it with the crawler chassis through each connecting rod; The extension cylinder of the leg is supported on the ground;

2) The drill pipe of the self-propelled drilling rig is connected with the drill bit, a) Control the lifting cylinder to make the power head go up along the two guide rails of the mast, lift the drill pipe to the butt joint at the lower end of the output shaft of the power head, and control the positive direction of the power head Rotate, the right-handed conical outer thread of the upper joint of the first section of drill pipe enters the right-handed conical inner thread of the opposite joint to complete the fixed connection between the first section of the drill pipe and the output shaft of the power head; b) Control the lifting cylinder to continue to lift The power head is used to hoist the drill bit to the bottom of the lower joint of the first section of the drill pipe, and control the power head to rotate in the forward direction to complete the fixed connection between the drill bit and the first section of the drill pipe above;

3) Self-propelled drilling rig digs into the soil, a) Manipulate the power head and the lifting cylinder to make the power head and its connected first section of drill pipe and drill bit rotate forward along the side of the mast while descending until the first section of drill pipe and drill bit are in turn. After passing through the bottom flange ring of the bottom mast, the inner cavity of the rotary reducer, and the through hole of the backing plate, it enters the soil layer for drilling; b) Turn off the power head to stop the forward rotation of the first section of the drill pipe and the drill bit, and move the short fork The plate enters the area enclosed by the four guide blocks on the backing plate from the inner cavity of the rotary reducer, and the inner bayonet of the short fork plate is aligned with the joint slot of the upper joint of the first section of drill pipe to insert and lock; The fork plate is placed on the end face of the bottom flange ring of the mast of the bottom section of the mast, and the inner bayonet of the long fork plate is aligned with the joint notch of the butt joint of the power head to be inserted and locked; c) Operate the rotary reducer to rotate in the reverse direction, The first section of drill pipe rotates in reverse with the rotary reducer, and the long fork plate rotates with the butt joint until its handle reaches the mast; The external thread is loosened from the conical internal thread of the butt joint, the long fork plate is pulled out from the joint slot of the butt joint, and the power head is operated to go up the mast, and the butt joint is completely disengaged from the first section of the drill pipe with the power head. The rotary reducer and the bottom flange ring of the bottom mast stay at a certain height; d) Lift and erect the second section of drill pipe that needs to be connected to the bottom of the power head. The joint and the lower joint are respectively aligned with the upper joint of the opposite joint and the first section of the drill pipe below, and the power head is controlled to rotate forward while going down, and the conical inner thread of the opposite joint enters the cone of the upper joint of the additional drill pipe section. The outer thread and the conical inner thread of the lower joint of the drill pipe of the second section to be added enter into the conical outer thread of the upper joint of the drill pipe of the first section below. The plate is taken out from the backing plate; e) Operate the power head and the lifting oil cylinder to make the power head and its connected two-section drill pipe and drill bit go down into the soil while rotating in the forward direction, until the second section of the drill pipe is connected in turn. After passing through the bottom flange ring of the bottom mast, the inner cavity of the rotary reducer, and the through hole of the backing plate, it enters the soil layer, and the drill pipe (8) and the drill bit are drilled and cut continuously, and finally the hole forming depth required by the design is reached. ;

4) Self-propelled drilling rig stirs grouting, a) Operates the power head and the lifting cylinder to make the power head and its connected multi-section drill pipe and drill bit move upward while rotating forward. During the lifting process of the drill bit, start the external grouting system to The cement slurry is injected into the hole through the grouting pipeline, the output shaft of the power head, the multi-section drill pipe and the drill bit, and the soil is fully stirred in situ; b) When the first section of the drill pipe fixed to the butt joint of the power head is exposed to form a hole , turn off the power head and the external grouting system, and remove the drill pipe according to b) and c) in step 3), until all the drill pipes and drill bits are taken out from the hole;

5) The cast-in-place pile is left to stand for maintenance, and the self-propelled drilling rig is operated to leave the hole-forming station. The mixture of cement slurry and in-situ soil in the hole is allowed to stand for maintenance as required to form a cement-in-place pile.

The present invention can also be that, in step 4), after the first section of drill pipe is removed from the power head, the power head and the lifting cylinder are operated to make the power head descend to the second section of the drill pipe, and the output shaft The butt joint is fixedly connected with the upper joint of the second section of the drill pipe below; the power head and the lifting cylinder are operated again to make the power head and its connected drill pipes and drill bits of the second section and above rotate forward while moving upwards. When the drill pipes and drill bits of the second section and above are rotated and lifted, the external grouting system is operated to inject the cement slurry into the holes until the drill pipes and drill bits of the second section and above are all raised to the ground; in this way, all the drill pipes are completed. And the lift-up and disassembly of the drill.

Description of drawings

Fig. 1 is the structural representation of the self-propelled drilling rig of the present invention;

Fig. 2 is the top view of Fig. 1;

Fig. 3 is A-A sectional view in Fig. 1;

Fig. 4 is B-B sectional view in Fig. 3;

Fig. 5 is the structural representation of the long fork plate of the drill pipe dismantling device in the self-propelled drilling rig of the present invention;

Fig. 6 is the structural representation of the power head in the self-propelled drilling rig of the present invention;

FIG. 7 is a plan view of FIG. 6 .

Detailed ways

The self-propelled drilling rig of the present invention will be further described with reference to the accompanying drawings 1-7.

A self-propelled drilling rig includes a crawler chassis 1, a mast 2, a power head 3, a lifting cylinder 4, two struts 5, a rotary reducer 6, a drill pipe disassembly device, and a multi-section drill with an upper joint 82 and a lower joint 83. Rod 8, drill bit 9 including upper joint 82, crawler chassis 1 includes chassis bracket 11 including front end support 112, two upper supports 115, four corner supports 113 and four side supports 114, four Connecting rod 12, four extension arms 13 and four outriggers 14; mast 2 includes bottom section mast 21 including bottom flange ring 211, mast lower support 212, two lower guide rails 213 and mast side lugs 215, including two The upper mast 21' of two upper guide rails 213'; the power head 3 includes a reduction box 31, an output shaft 32, a butt joint 33 with a joint slot 331, two guide frames 34 and two guides respectively located at the rear end of the reduction box Protective barrel 35; drill pipe dismantling device includes short fork plate 71 with inner bayonet 712, long fork plate 72 with handle 725 with inner bayonet 712 and backing plate 73 with four guide blocks 731; upper joint 82 of drill pipe 8 It includes a joint slot 331 and a right-handed conical external thread; the lower joint 83 of the drill rod 8 includes a joint slot 331 and a right-handed conical internal thread; the upper joint 82 of the drill bit 9 includes a joint slot 331 and a right-handed conical external thread; wherein :

The chassis bracket 11 of the crawler chassis 1 is a rectangular frame member; the front end support 112 is arranged in the center of the front end of the chassis bracket 11; the upper support 115 is arranged on the upper end surface of the chassis bracket 11 in a left-right symmetrical manner; The corner supports 113 are arranged at the four corners of the chassis bracket 11; the side brackets 114 are arranged in two groups on the left and right sides of the chassis bracket 11; The two setting methods are connected to the chassis bracket 11, one end of which is hingedly installed on each corner support 113 of the chassis bracket 11, and the other end is fixed with the legs 14; The levelness of the crawler chassis 1 and its chassis support 11 is required, so as to improve the verticality of the drilling rig to form piles, and to ensure the construction quality of the cast-in-place piles and foundation reinforcement. The connecting rods 12 are hingedly connected with each side support 114 of the chassis bracket 11 and the spreader fork 131 of each extension arm 13 ; two or three spreader forks 131 of the extension arm 13 are provided. In this way, when each extension arm 13 expands outward along the side support 114 of the chassis bracket 11, the connecting rod 12 is hingedly installed with the extension arm fork 131 at different positions on the extension arm 13, which can adapt to different surrounding venue spaces and satisfy the The chassis bracket 11 of the crawler chassis 1 meets the overall stability requirements of the self-propelled drilling rig.

The mast 2 is fixedly mounted on the front of the mainframe chassis 1, and is hingedly connected to the front end support 112 of the main frame 11 through the lower mast 212 of the bottom mast 21; the upper mast 21' is fixedly mounted on the bottom mast 21; after the bottom mast 21 and the upper mast 21' are butted, their lower guide rails 213 and upper guide rails 213' constitute the guide rail of the mast 2; the bottom flange ring 211 of the bottom mast 21 is arranged in a vertical manner at its bottom.

The struts 5 are arranged on two sides of the bottom mast 21 and are respectively hingedly connected to the side supports 25 of the bottom mast 21 and the two upper supports 115 of the chassis bracket 11 . Generally, after the bottom mast 21 of the mast 2 is erected backwards along the front end support 112 in the center of the front end of the chassis bracket 11, the two ends of the strut 5 are respectively connected to the side support 25 of the mast 2 and the upper support of the chassis support 11. 115 is hinged and locked.

The power head 3 is placed in front of the mast 2, and it is respectively placed on the two guide rails of the mast 2 through the two guide frames 34 of the reduction box 31; The guide casing 35 is fixed on the outer side of the two guide frames 34 respectively; the butt joint 33 is fixed on the lower end of the output shaft 32 of the power head; During the forward rotation of the power head 3, the upper joint 82 of the drill pipe 8 and the butt joint 33, the lower joint 83 of the drill pipe 8 of the upper section and the drill pipe 8 of the lower section are connected together. The upper joint 82 is locked with the drill bit 9 until the last section of the drill pipe 8; the power head 3 is operated to go down along the two guide rails of the mast 2, and the multi-section drill pipe 8 and the drill bit 9 connected to the joint 33 pass through the bottom section in turn The bottom flange ring 211 of the mast 21, the inner cavity of the rotary reducer 6, and the through hole 732 of the backing plate are then drilled down into the bottom layer to the hole depth required by the design.

The lifting cylinders 4 are respectively arranged in the manner of passing through the two guide casings 35 of the power head 3 , and the cylinder end and the piston rod are respectively hinged to the bottom of the guide casing 35 and the mast side ear seats 215 on both sides of the bottom mast 21 . Install. The lifting oil cylinder 4 adopts the type of multi-section telescopic hydraulic cylinder. In this way, the travel requirement of the power head moving up and down along the guide rail of the mast is effectively met.

The rotary reducer 6 is fixedly mounted on the lower end surface of the bottom flange ring 211 of the bottom section mast 21 of the mast 2 .

The backing plate 73 of the drill rod dismantling device is fixedly mounted on the rotary ring of the lower end face of the rotary reducer 6, and the four guide blocks 731 of the backing plate are located in the inner cavity of the rotary reducer 6; When the speed reducer 6 is turned off, the backing plate 73 rotates together with the turning circle of the turning speed reducer 6 . The four guide blocks 731 of the backing plate 73 are arranged in a rectangular arrangement on the end surface outside the through hole; the short fork plate 71 is placed on the backing plate 73 after passing through the inner cavity of the rotary reducer 6 In the area enclosed by the guide blocks 731 ; the thickness of the short fork plate 71 is greater than the height of the four guide blocks 731 of the backing plate 73 . The long fork plate 72 is placed on the upper end surface of the bottom flange ring 211 of the bottom mast 21 .

After the multi-section drill rod 8 reaches the hole-forming depth required by the design, the power head 3 is turned off to stop the forward rotation of the multi-section drill rod 8, and the inner bayonet 712 of the short fork plate 71 is aligned with the lower hole. The joint notch 331 of the upper joint 82 of a section of drill pipe 8 is inserted, and after passing through the inner cavity of the rotary reducer 6, it is placed in the area enclosed by the four guide blocks 731 on the backing plate 73, The drill rod 8 is locked; the inner bayonet 712 of the long fork plate 72 is aligned with the joint notch 331 of the butt joint 33 of the power head 3, and the handle 725 is placed on the bottom of the mast 21 of the bottom section of the mast 2. On the upper end face of the flange ring 211, the pair of joints 33 is locked.

In conjunction with accompanying drawing 1-7, utilize the construction method of self-propelled drilling rig, comprising the following steps:

Step 1: Self-propelled rig installed in place

a) Clean up the construction site, ensure that the construction area is flat and avoid high-voltage cables; b) Move the crawler chassis 1 on which the mast 2, the slewing reducer 6 and the backing plate 73 are installed to the construction area, and use a crane to lift the mast 2 upright Install two struts 5, install the power head 3 and the lifting cylinder 4 in front of the mast 2; connect the extension cylinder of the outrigger 14 and the hydraulic hose of the lifting cylinder 4, connect the power cable of the power head 3, and connect the external The grouting pipeline of the grouting system is firmly connected with the grouting port of the power head 3; c) Manipulate the self-propelled drilling rig to move to the drilling station, open the extension arm 13 of the crawler chassis 1 to the outside, and pass the connecting rods 12 to separate Locked with the crawler chassis 1; the extension cylinders that operate the outriggers 14 are supported on the ground.

Step 2: Drill pipe and drill bit connection of self-propelled drilling rig

a) Operate the lifting cylinder 4 to make the power head 3 go up along the two guide rails of the mast 2, lift the first section of drill pipe 8 to the butt joint 33 at the lower end of the output shaft 32) of the power head 3, and operate the power head 3 forward Rotating, the right-handed conical external thread of the upper joint 82 of the first section of drill pipe 8 enters the right-handed conical internal thread of the opposite joint 33 to complete the fixed connection between the first section of the drill pipe 8 and the output shaft 32 of the power head 3; b) Operate the lifting cylinder 4 to continue to lift the power head 3, lift the drill bit 9 to the bottom of the lower joint 83 of the first section of drill pipe 8, operate the power head 3 to rotate in the forward direction, and complete the fixation of the drill head 9 and the first section of the drill pipe 8 above. connect.

Step 3: Self-propelled drilling rig digging into the soil

a) Operate the power head 3 and the lifting cylinder 4 to make the power head 3 and its connected first section of drill pipe 8 and drill bit 9 rotate in the forward direction along the mast 2 while descending until the first section of drill pipe 8 and the drill bit pass through in turn The bottom flange ring 211 of the bottom mast 21, the inner cavity of the rotary reducer 6, and the through hole 732 of the backing plate enter the soil layer for drilling; b) Turn off the power head 3 to stop the forward rotation of the first section of drill pipe 8 and drill bit 9 , put the short fork plate 71 from passing through the inner cavity of the rotary reducer 6 into the area enclosed by the four guide blocks 731 on the backing plate 73, and the inner bayonet 712 of the short fork plate is aligned with the upper part of the first section of the drill pipe 8 The joint notch 331 of the joint 82 is inserted and locked; the long fork plate 72 is placed on the end face of the bottom flange ring 211 of the bottom section of the mast 21 of the mast 2, and the inner bayonet 712 of the long fork plate is aligned with the butt joint of the power head 3 The joint slot 331 of 33 is inserted and locked; c) Operate the rotary reducer 6 to rotate in the reverse direction, the first section of drill pipe 8 rotates in the opposite direction with the rotary reducer 6, and the long fork plate 72 rotates with the butt joint 33 until its handle 725 reaches the mast Stop at 2:00; the reverse rotation of the rotary reducer 6 drives the short fork plate 71 and the conical external thread of the upper joint 82 of the first section of the drill pipe 8 to loosen from the conical internal thread of the butt joint 33, and the long fork plate 72 is removed from the opposite The joint notch 331 of the joint 33 is pulled out, the power head 3 is operated to go up the mast 2, the butt joint 33 is completely disengaged from the first section of drill pipe 8, and is separated from the rotary reducer 6 and the bottom flange ring of the bottom section of the mast 21 211, stay at a certain height; d) lift and erect the second section of drill pipe 8 that needs to be connected to the bottom of the power head 3, and the upper joint 82 and the lower joint 83 of the second section of the drill pipe are aligned respectively To the joint 33 and the upper joint 82 of the first section of drill pipe 8 below, operate the power head 3 to rotate in the forward direction, and the conical inner thread of the joint 33 enters the conical outer surface of the upper joint 82 of the second section of the drill pipe 8 to be attached. Thread, the conical inner thread of the lower joint 83 of the drill pipe 8 of the second section to be connected enters into the conical outer thread of the upper joint 82 of the drill pipe 8 of the first section below, and the conical external thread of the upper joint 82 of the drill pipe 8 of the first section is completely tightened, and the addition of the drill pipe 8 of the second section is completed. , take out the short fork plate 71 from the backing plate 73; e) operate the power head 3 and the lifting cylinder 4 to make the power head 3 and its connected second drill pipe 8 and drill bit 9 rotate forward while descending into the soil for drilling. , until the connected second drill pipe 8 passes through the bottom flange ring 211 of the bottom mast 21, the inner cavity of the rotary reducer 6, and the through hole 732 of the backing plate and then enters the soil layer. 8 and drill bit 9 drill down and cut, and finally reach the hole forming depth required by the design.

Step 4: Self-propelled drilling rig mixing and grouting

a) Operate the power head 3 to lift the oil cylinder 4 to make the power head 3 and its connected multi-section drill pipe 8 and drill bit 9 move upward while rotating forward. During the lifting process of the drill bit 9, start the external grouting system to pass the cement slurry through the The slurry pipeline, the output shaft 32 of the power head 3, the multi-section drill pipe 8 and the drill bit 9 are injected into holes and the soil is fully stirred in situ; b) When the first section of the drill pipe 8 is fixed with the butt joint 33 of the power head 3 When the hole forming is exposed, turn off the power head 3 and the external grouting system, and remove the first section of drill pipe according to b) and c) in step 3), and so on, until all the drill pipe 8 and the drill bit 9 are taken out from the hole forming.

When the first section of drill pipe 8 is removed from the power head 3, operate the power head 3 and the lifting cylinder 4 to make the power head 3 descend to the second section of the drill pipe 8, and connect the butt joint 33 at the output shaft 32 with the lower one. The upper joint 82 of the second section of the drill pipe 8 is fixedly connected; the power head 3 and the lifting cylinder 4 are operated again, so that the power head 3 and the drill pipe 8 and the drill bit 9 of the second section and above connected to it are rotated forward and upward, When the drill pipe 8 and the drill bit 9 of the second section and above are rotated and lifted, the external grouting system is operated to inject the cement slurry into the hole until the drill pipe 8 and the drill bit 9 of the second section and above are all raised to the ground; , to complete the lifting and dismantling of all drill rods 8 and drill bits.

Step 5: Static maintenance of cast-in-place piles

Operate the self-propelled drilling rig to leave the hole-forming station, and the mixture of cement slurry and in-situ soil in the hole-forming hole will form a cement cast-in-place pile after standing and curing as required.

The self-propelled drilling rig and its construction method of the invention have the characteristics of convenient movement, simple structure, convenient docking and disassembly, reliable hole formation, etc., and can realize fast drilling and stirring construction in the construction area with limited height and limited surrounding environment, and improve the perfusion in the low headroom area. Operational efficiency of pile construction and foundation reinforcement treatment.

Various changes and improvements can also be made to the present invention without departing from the general concept of the present invention, but as long as they are the same or equivalent to the present invention, they also belong to the protection scope of the present invention.

Claims (6)

1. The utility model provides a from walking rig, includes track chassis (1), mast (2), unit head (3), lift cylinder (4), two vaulting poles (5), slewing reducer (6), drilling rod dismounting device, multisection have drilling rod (8) of top connection (82) and lower clutch (83), contain drill bit (9) of top connection (82) wherein:

the crawler chassis (1) comprises a chassis support (11) comprising a front end support (112), two upper supports (115), four corner supports (113) and four side supports (114), four connecting rods (12), four extending arms (13) and four supporting legs (14);

the mast (2) comprises a bottom section mast (21) comprising a bottom flange ring (211), a mast lower support (212), two lower guide rails (213) and a mast side lug seat (215), and an upper mast (21 ') comprising two upper guide rails (213');

the power head (3) comprises a reduction gearbox (31), an output shaft (32), a butt joint (33) with a joint notch (331) and right-handed conical external threads, two guide frames (34) and two guide protective cylinders (35) which are respectively positioned at the rear end part of the reduction gearbox;

the drill rod dismounting device comprises a short fork plate (71) with an inner bayonet (712), a long fork plate (72) with the inner bayonet (712) and a handle (725), and a backing plate (73) with four guide blocks (731);

the upper joint (82) of the drill rod (8) comprises a joint notch (331) and a right-hand conical external thread; the lower joint (83) of the drill rod (8) comprises a joint notch (331) and a right-handed conical internal thread;

the upper joint (82) of the drill bit (9) comprises a joint notch (331) and a right-handed conical external thread;

the method is characterized in that:

the chassis support (11) of the crawler chassis (1) is a rectangular frame component; the front end support (112) is arranged in the center of the front end part of the chassis support (11); the upper support (115) is arranged on the upper end surface of the chassis support (11) in a left-right symmetrical mode; the corner supports (113) are arranged at four corners of the chassis support (11); the side supports (114) are arranged on the left side surface and the right side surface of the chassis support (11) in a mode of two groups; the extension arms (13) are connected with the chassis support (11) in a mode of respectively arranging a front side and a rear side, one end of each extension arm is respectively hinged to each corner support (113) of the chassis support (11), and the other end of each extension arm is fixedly provided with a supporting leg (14); the connecting rods (12) are respectively hinged with the side supports (114) of the chassis support (11) and the arm spreading fork seats (131) of the extending arms (13);

the mast (2) is fixedly arranged in front of the main machine chassis (1) and is hinged with the front end support (112) of the main machine frame (11) through a mast lower support (212) of the bottom section mast (21); the upper mast (21') is fixedly arranged above the bottom section mast (21); after the bottom section mast (21) and the upper mast (21 ') are butted, a lower guide rail (213) and an upper guide rail (213') of the bottom section mast (21) and the upper mast form a guide rail of the mast (2); the bottom flange ring (211) of the bottom section mast (21) is vertically arranged at the bottom of the bottom section mast;

the stay bar (5) is arranged on two sides of the bottom section mast (21) and is respectively hinged with the side support (25) of the bottom section mast (21) and the two upper supports (115) of the chassis support (11);

the power head (3) is arranged in front of the mast (2) and is respectively arranged on two guide rails of the mast (2) through two guide frames (34) of the reduction gearbox (31); a guide frame (34) of the power head (3) is fixedly arranged above the left side and the right side of the rear side of the reduction box (31); the guide protective cylinders (35) are respectively and fixedly arranged at the outer sides of the two guide frames (34); the butt joint (33) is fixedly arranged at the lower end of an output shaft (32) of the power head; a plurality of sections of drill rods (8) and drill bits (9) are additionally connected below the butt joint (33) in sequence, and an upper joint (82) of the drill rod (8) and the butt joint (33), a lower joint (83) of the drill rod (8) above the butt joint and an upper joint (82) of the drill rod (8) below the butt joint, and the drill bit (9) are locked until the last section of drill rod (4) is locked; the power head (3) is operated to move downwards along the two guide rails of the mast (2), and a plurality of sections of drill rods (8) and drill bits (9) connected with the butt joint (33) sequentially pass through a bottom flange ring (211) of the bottom section mast (21), an inner cavity of the slewing reducer (6) and a base plate through hole (732) and then enter a bottom layer to drill to a hole forming depth required by the design;

the lifting oil cylinder (4) is respectively arranged in a mode of penetrating through two guide protective cylinders (35) of the power head (3), and a cylinder barrel end and a piston rod of the lifting oil cylinder are respectively hinged with the bottoms of the guide protective cylinders (35) and mast side ear seats (215) at two sides of a bottom section mast (21);

the slewing reducer (6) is fixedly arranged on the lower end face of a bottom flange ring (211) of a bottom section mast (21) of the mast (2);

a backing plate (73) of the drill rod dismounting device is fixedly arranged on a rotary ring on the lower end surface of the rotary speed reducer (6), and four guide blocks (731) of the backing plate are positioned in an inner cavity of the rotary speed reducer (6); the four guide blocks (731) of the backing plate (73) are arranged on the end surface outside the through hole in a rectangular arrangement mode;

after the multiple sections of drill rods (8) reach the hole forming depth required by the design along with the drill bit (9), closing the power head (3) to stop the forward rotation of the multiple sections of drill rods (8), inserting the inner bayonet (712) of the short fork plate (71) into the joint notch (331) of the upper joint (82) of the lower section of drill rods (8), placing the short fork plate in an area surrounded by four guide blocks (731) on the backing plate (73) after penetrating through the inner cavity of the slewing reducer (6), and locking the lower section of drill rods (8); the inner bayonet (712) of the long fork plate (72) is inserted in alignment with the joint notch (331) of the butt joint (33) of the power head (3), and the handle (725) of the long fork plate is placed at the upper end face of the bottom flange ring (211) of the bottom section mast (21) of the mast (2), so that the butt joint (33) is locked.

2. The self-propelled drilling machine according to claim 1, characterized in that two, or three, spreader-arm prongs (131) of the extension arm (13) are provided.

3. Self-propelled drilling machine according to claim 1, characterized in that the lift cylinder (4) is in the form of a multi-joint telescopic cylinder.

4. The self-walking drill rig according to claim 1, characterized in that the thickness of the short fork plate (71) is larger than the height of the four guide blocks (731) of the tie plate (73).

5. A construction method using the self-walking drilling machine of any one of claims 1 to 4, comprising the steps of:

1) from the rig of walking installation in place

a) Cleaning a construction site, ensuring the site of the construction area to be flat and avoiding high-voltage cables;

b) moving a crawler chassis (1) provided with a mast (2), a slewing reducer (6) and a base plate (73) to a construction area, erecting the mast (2) by using a crane, then installing two support rods (5), and installing a power head (3) and a lifting oil cylinder (4) in front of the mast (2); a hydraulic hose of an extension oil cylinder and a lifting oil cylinder (4) of the supporting leg (14) is connected, a power cable of the power head (3) is connected, and a grouting pipeline of an external grouting system is firmly connected with a grout feeding port of the power head (3);

c) the self-walking drilling machine is operated to move to a drilling station, an extending arm (13) of the crawler chassis (1) is opened outwards and is respectively locked with the crawler chassis (1) through each connecting rod (12); the extending oil cylinder of the control supporting leg (14) is supported on the ground;

2) drill rod and bit connection from a walking rig

a) Operating the lifting oil cylinder (4) to enable the power head (3) to move upwards along two guide rails of the mast (2), hoisting a first section of drill rod (8) at a butt joint (33) at the lower end of an output shaft (32) of the power head (3), operating the power head (3) to rotate forwards, and enabling a right-handed conical external thread of an upper joint (82) of the first section of drill rod (8) to enter a right-handed conical internal thread of the butt joint (33) to complete fixed connection of the first section of drill rod (8) and the output shaft (32) of the power head (3);

b) operating the lifting oil cylinder (4) to continuously lift the power head (3), hoisting the drill bit (9) to the position below a lower joint (83) of the first section of drill rod (8), and operating the power head (3) to rotate in the forward direction to complete the fixed connection of the drill bit (9) and the first section of drill rod (8);

3) self-walking drilling machine for digging into soil

a) The power head (3) and the lifting oil cylinder (4) are operated to enable the power head (3) and a first section of drill rod (8) and a drill bit connected with the power head to rotate in the positive direction along the mast (2) and move downwards until the first section of drill rod (8) and the drill bit (9) sequentially penetrate through a bottom flange ring (211) of a bottom section of mast (21), an inner cavity of a rotary speed reducer (6) and a base plate through hole (732) and then enter a soil layer to drill;

b) the power head (3) is closed to enable the first section of drill rod (8) and the drill bit to stop rotating forwards, a short fork plate (71) enters an area surrounded by four guide blocks (731) on a backing plate (73) from an inner cavity penetrating through a rotary speed reducer (6), and an inner bayonet (712) of the short fork plate is inserted into a connector notch (331) of an upper connector (82) of the first section of drill rod (8) and then locked; placing a long fork plate (72) on the end surface of a bottom flange ring (211) of a bottom section mast (21) of the mast (2), wherein an inner bayonet (712) of the long fork plate is aligned with a connector notch (331) of a butt connector (33) of the power head (3) and locked after being inserted;

c) the slewing reducer (6) is operated to rotate reversely, the first section of drill rod (4) rotates reversely along with the slewing reducer (6), and the long fork plate (72) rotates along with the butt joint (33) until the handle (725) of the long fork plate reaches the mast (2); the slewing reducer (6) rotates reversely to drive the short fork plate (71) and the conical external thread of the upper joint (82) of the first section of drill rod (4) to loosen from the conical internal thread of the butt joint (33), the long fork plate (72) is pulled out from the joint notch (331) of the butt joint (33), the power head (3) is operated to move upwards along the mast (2), the butt joint (33) is completely separated from the first section of drill rod (8) along with the power head (3), leaves the slewing reducer (6) and a bottom flange ring (211) of the bottom section of mast (21) and stays at a certain height position;

d) hoisting and erecting a second section of drill rod (8) to be additionally connected below the power head (3), wherein an upper joint (82) and a lower joint (83) of the second section of drill rod are respectively aligned with the butt joint (33) and an upper joint (82) of a first section of drill rod (8) below, operating the power head (3) to move downwards while rotating forwards, and completing the additional connection of the second section of drill rod (8) after the conical internal thread of the butt joint (33) enters the conical external thread of the upper joint (82) of the additionally connected second section of drill rod (8) and the conical internal thread of the lower joint (83) of the additionally connected second section of drill rod (8) enters the conical external thread of the upper joint (82) of the first section of drill rod (8) below and is completely fastened, and taking out the short fork plate (71) from the backing plate (73);

e) operating the power head (3) and the lifting oil cylinder (4), enabling the power head (3) and two sections of drill rods (8) and a drill bit (9) connected with the power head to perform downward earth boring drilling while rotating in the positive direction until the second section of drill rods (8) which are continuously connected penetrate through a bottom flange ring (211) of a bottom section mast (21), an inner cavity of a rotary speed reducer (6) and a base plate through hole (732) and enter a soil layer, and finally achieving the hole forming depth required by design through downward boring cutting of the drill rods (8) and the drill bit (9) which are continuously connected;

4) stirring grouting from self-walking drilling machine

a) Operating the power head (3) and the lifting oil cylinder (4), enabling the power head (3) and a plurality of sections of drill rods (8) and drill bits (9) connected with the power head to rotate in the forward direction and move upwards, and starting an external grouting system to inject cement slurry into a pore through a grouting pipeline, an output shaft (32) of the power head (3), the plurality of sections of drill rods (8) and the drill bits (9) in the lifting process of the drill bits (9) to be fully stirred with in-situ soil;

b) when a first section of drill rod (8) fixedly mounted with a butt joint (33) of the power head (3) is exposed out of the formed hole, closing the power head (3) and an external grouting system, and detaching the first section of drill rod (8) according to steps b) and c) in step 3), and thus, taking all the drill rods (8) and the drill bits (9) out of the formed hole;

5) standing maintenance of cast-in-place pile

And operating the self-walking drilling machine to leave a pore-forming station, and standing and maintaining the mixture of the cement slurry and the in-situ soil in the pore-forming station according to the requirement to form the cement cast-in-place pile.

6. The construction method of the self-walking drilling machine according to claim 5, characterized in that in step 4), after the first section of drill rod (8) is detached from the power head (3), the power head (3) and the lifting cylinder (4) are operated to make the power head (3) descend to the second section of drill rod (2), and the butt joint (33) at the output shaft (32) is fixedly connected with the upper joint (82) of the second section of drill rod (8) below; operating the power head (3) and the lifting oil cylinder (4) again to enable the power head (3) and a second section and above of drill rods (8) connected with the power head to rotate in the forward direction and move upwards at the same time, and operating an external grouting system to inject cement slurry into the holes when the second section and above of drill rods (8) and the drill rods rotate and lift upwards at the same time until the second section and above of drill rods (8) and the drill bits (9) are all lifted out of the ground; thus, the lifting and the disassembly of all the drill rods (8) and the drill bits are completed.

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