CN1202318C

CN1202318C - Method and apparatus for pile making by boring and pumping mass concrete and rotation jetting slurry

Info

Publication number: CN1202318C
Application number: CN 03110899
Authority: CN
Inventors: 刘润郊
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-01-15
Filing date: 2003-01-15
Publication date: 2005-05-18
Anticipated expiration: 2023-01-15
Also published as: CN1439776A

Abstract

The present invention discloses a method and device for making a pile by boring and pumping mass concrete and jetting slurry in rotation, which relates to a method for making a pile and a device used by the method. In the method, high-pressure medium is jetted to a hole wall at the bottom of a pile hole by a jet nozzle arranged below a grout-jetting pipe of a drilling tool after drilling is up to design elevation; the drilling tool is rotated and moved up and down at the same time of jetting. The device is provided with a rotary slurry transfusing and concrete injecting device (4) above the drilling tool (1). A slurry transfusing pipe (2) is fixedly connected to the drilling tool (1). The jet nozzle (3) on the lower end of the slurry transfusing pipe (2) is arranged below the lowest section blade (1-1) of the drilling tool (1). The jet nozzle (3) is close to one side of a drill plate shoulder (8), and is shorter than the shoulder (8) on the transverse direction. The method solves the problem of the poor pile forming quality of the existing pile forming method. The device of the present invention has the advantages of simple structure, easy operation, high construction speed and good sealing performance.

Description

The borehole pump pouring large flow concrete rotary grout-jet expands end piling method and pile making device

Technical field: the present invention relates to a kind of piling method and this method equipment therefor.

Background technology: at present, round this construction machine of concrete pump, people develop multiple under weak, complex geological condition the piling method and the pile making device of (as: groundwater table height, sand buried regions are thick, stream mould situations such as soil).That Chinese patent ZL93120168.3 has announced is a kind of " superfluidity concrete and method for filling thereof and the used rig of this method ", and Chinese patent ZL9621018108 has announced and a kind ofly " has been used for the pile-forming drilling machine on the injecting concrete castinplace pile.The bearing capacity of above-mentioned two patent institute piles is lower.For overcoming the low problem of above-mentioned bearing capacity of single pile, I have developed a kind of " borehole pump pouring large flow concrete hole-bottom grout-jetting bottom expanding pile forming device; its patent No.: ZL01248919.0; this technology is after the boring end; use an interior Grout-jetting pipe vectored injection cement paste of drilling rod to expand the end before the injecting concrete, then carry out pile operations such as injecting concrete, insertion reinforcing cage.Chinese patent ZL01211476.6 has announced " auger stem center pump-injecting concrete and bottom-grouting-enlarged device, but with regard to diagram that its manual is addressed, its machinery does not guarantee the requirement of its technology.And some other hole-bottom grout-jetting method exists pile quality poor, the problem of pile making device sealing difference.

Summary of the invention: the present invention is that a kind of borehole pump pouring large flow concrete rotary grout-jet expands end piling method and pile making device, and this method solves the problem of existing piling method pile quality difference, this device solves the problem of existing pile making device sealing difference.Piling method of the present invention is: holing to design elevation, using the hole wall inject high pressure medium of the jet blower of the Grout-jetting pipe below that is installed on the drilling tool to bottom, stake hole, making drilling tool rotate also play up and down when spraying.Described high-pressure medium is a cement paste, and its water/binder ratio is 1: 0.4-0.5.The pressure of penetrating slurry is at 8-20MPa.Penetrating the slurry amount is the long-pending 15%-25% of pile body.Drilling tool is when the inject high pressure medium, and the height of play is in 2 meters apart from bottom, stake hole up and down.Finish and expand after the end penetrates slurry, Grout-jetting pipe connects airduct and air compressor machine with snap joint immediately, starts air compressor machine and press wind in Grout-jetting pipe, in order to avoid in follow-up notes concrete operation Grout-jetting pipe is stopped up.After penetrating slurry and finishing drilling tool lifted from the height of 0.5m-1m at the bottom of the hole, and start concrete pump injecting concrete in the stake hole.The degree of falling of spoiling of the concrete that institute's pump is irritated is 18-23cm, drilling tool is carried on pump concrete limit, limit, and make drill bit be embedded in 1.5m-3m in the concrete, putting forward the speed of drilling tool can grasp according to the amount of pumping into of concrete, is generally carrying to 2/3 when long, and concrete flows out the aperture along the hole between hole wall and the drilling tool blade, and (outflow is muddy water, impurity etc. earlier, then be pure concrete), at this moment carry the drilling speed degree and suitably accelerate, propose to should be full hole concrete in the drilling tool metapore, insert then or reinforcing cage pile to the design elevation is gone in shake.Since concrete spoil that degree of falling is big, permeability is strong, the stake after the construction is the pile crown concrete 0.5-2m that can sink sometimes, meet the mud scum above the concrete to be disposed behind the special circumstances pile after, add concrete to place, stake aperture; If after the concrete initial set, find above-mentioned situation, in the time of just can only waiting to dig cushion cap plane pile crown pile crown has been connect.Pile making device of the present invention is equipped with the defeated slurry of rotation and annotates concrete device 4 above drilling tool 1, on drilling tool 1, be fixedly connected with feed pipe for mortar 2, the jet blower 3 of feed pipe for mortar 2 lower ends is located at the below of next joint blade 1-1 of drilling tool 1, and jet blower 3 is near drill bit plate shoulder 8 one sides, and laterally is shorter than shoulder 8.The defeated slurry of rotation annotate concrete device 4 be installed in unit head 5 above or below, feed pipe for mortar 2 is fixed on the inwall or outer wall of drilling tool 1.During boring, because nozzle is provided in a side of following (back) of bit blades, with spitball or other article beyond the Great Wall, hole when design elevation is penetrated slurry, before the boring because pump pressure is big, obstruction on the nozzle together sprays with cement paste, the cement paste of ejection forms a line, and sprays hole wall with the drill bit rotation, is sprayed the silt particle major part that cuts off and is transported on the hole by blade, another part is residual at the bottom of the hole, and this part silt particle has been stirred into cement mortar by cement paste and drill bit.During injecting concrete, hole base space moment when this part cement mortar is waited to reach intensity, is the top bearing stratum of stake end by the mass concrete squeeze pack, thus, this process reform original geological conditions, improved the endurance on ground, thereby increased bearing capacity of pile tip.When injecting concrete, drill bit and drilling tool will be embedded in 1.5-3m place in the concrete all the time, can prevent the quality of hole wall collapse influence stake like this; Connect airduct simultaneously, and press wind in Grout-jetting pipe, the cement mortar that can prevent from like this to reflux is got into Grout-jetting pipe, and it is blocked.The defeated slurry of the rotation of pile making device of the present invention is annotated the requirement that concrete device 4 had both satisfied high-pressure slip-casting, does not influence the notes concrete again.Advantage simple in structure, easy to operate, that speed of application is fast, sealing is good that pile making device of the present invention has.The pressure of the gunite of 8-20MPa can make a hole base diameter increase in the piling method of the present invention, thereby reaches the requirement that improves pile capacity; The grouting amount of the long-pending 15%-25% of pile body is to inject scope through the best that experiment obtains; The expulsion pressure of cement paste and slurry are measured and then can be made that the bottom diameter is excessive influences each other when excessive, and make between each disturbance excessive; Cement paste injection rate and pressure too small then inoperative (by existing design specifications, three times of power of stake) then cause waste when excessive.Piling method of the present invention is widely used, and it does not select geological conditions, but viscosity is big, the equal pile of sandy soil, boulder bed.With the inventive method became stake safety, reliable, bearing capacity of single pile is high, overall cost is low, and is economical and practical.Piling method of the present invention has also that speed of application is fast, the advantage of noiselessness, nuisanceless, compliance with environmental protection requirements.

Description of drawings: Fig. 1 is the structural representation of pile making device in the specific embodiment one, Fig. 2 is the structural representation that the defeated slurry of rotation is annotated concrete device 4 in the specific embodiment one, Fig. 3 is the structural representation that the defeated slurry of rotation is annotated concrete device 4 in the specific embodiment two, Fig. 4 is the A-A sectional view of Fig. 3, and Fig. 5 is the structural representation of the specific embodiment three.

The specific embodiment one: the piling method of present embodiment is: 1, hole to design elevation; 2, the jet blower 3 by being installed in the playpipe below on the drilling tool is to the hole wall inject high pressure cement paste of bottom, stake hole, when spraying, make drilling tool rotate also play up and down, the water/binder ratio of gunite is 1: 0.4-0.5, penetrating slurry pressure is 15MPa, penetrate the slurry amount and be pile body long-pending 25%, drilling tool is when the inject high pressure medium, and the height of play is in 2 meters apart from bottom, stake hole up and down; 3, finish and penetrate slurry back Grout-jetting pipe and connect airduct and air compressor machine, and start air compressor machine and in Grout-jetting pipe, press wind with snap joint; 4, when pressing wind, drilling tool is lifted from the height of 0.5m at the bottom of the hole, and start concrete pump injecting concrete in the stake hole; 5, after the pump concrete finishes, close air compressor machine, and insert reinforcing cage to the stake hole.The pile making device of present embodiment is made up of injecting concrete pipe 6, drilling tool 1, the defeated slurry notes of rotation concrete device 4, feed pipe for mortar 2, unit head 5.Feed pipe for mortar 2 is fixed on the inwall of drilling tool 1, feed pipe for mortar 2 bottoms are three-port structure, the end of the side pipe 2-1 of threeway is a jet blower 3, and the end of the lower end arm 2-2 of threeway is provided with removable plug 2-3, like this can be regularly or pull down plug 2-3 cleaning feed pipe for mortar 2 during plugging.Jet blower 3 is located at the below of next joint blade 1-1 of drilling tool 1, and jet blower 3 is near drill bit plate shoulder 8 one sides, and laterally is shorter than shoulder 8.The defeated slurry of rotation is annotated the top that concrete device 4 is arranged on unit head 5, the defeated slurry of this rotation annotate concrete device 4 by adpting flange 4-1, the two ends flanged (FLGD) sealing short tube 4-2 that is connected with injecting concrete pipe 6, with the fixedly connected short tube support 4-3 of unit head 5 shells, lower flange 4-4, the interior pipe 4-5, the annular flower stand 4-6 that are connected with the power transmission shaft 5-1 of the interior logical concrete of unit head 5, seal concrete glue and seal 4-7, rotary packing ring 4-8 and form; The upper end of interior pipe 4-5 is connected with injecting concrete pipe 6, fixedlys connected with lower flange 4-4 in the lower end of interior pipe 4-5, the outside of pipe 4-5 in sealing short tube 4-2 and short tube support 4-3 are set in from top to bottom; The upper and lower side of sealing short tube 4-2 is fixedlyed connected with short tube support 4-3 with adpting flange 4-1 respectively, is provided with envelope concrete glue envelope 4-7 between sealing short tube 4-2 and interior pipe 4-5; The centre of pipe 4-5 and short tube support 4-3 in flower stand 4-6 is arranged on, the upper and lower of flower stand 4-6 is equipped with rotary packing ring 4-8, along the circumferential direction be provided with a plurality of through hole 4-9 at flower stand 4-6, there is the cavity 4-10 of defeated slurry in the outside in the flower stand 4-6, on the tube wall of short tube support 4-3, have the accessibke porosity 4-12 that feed pipe for mortar 4-11 is connected with cavity 4-10 outside making, on interior pipe 4-5 tube wall, have the inner via hole 4-13 that feed pipe for mortar 2 is connected with cavity 4-10.Above-mentioned sealing short tube 4-2 and envelope concrete glue envelope 4-7 have guaranteed the sealing of concrete when drilling tool rotates.The outer end of outer feed pipe for mortar 4-11 also is equipped with and is used to connect more the change planes snap joint 7 of airduct of pneumatics.

The specific embodiment two: what present embodiment and the specific embodiment one were different is, the defeated slurry of rotation is annotated the below that concrete device 4 is arranged on unit head 5, the upper flange 4-14 that the defeated slurry notes of this rotation concrete device 4 is connected by the drive flange with unit head 5, the lower flange 4-15, the transmission tube 4-16 that are connected with the drilling rod 1-2 of drilling tool 1, sleeve pipe 4-17, rotary packing ring 4-19, bearing 4-20, on carry on the back cap 4-21 and lower back cap 4-22 forms; Last back of the body cap 4-21 and lower back cap 4-22 are embedded in respectively among the groove 4-23 of upper flange 4-14 and lower flange 4-15 upper and lower end face, last back of the body cap 4-21 and lower back cap 4-22 are threaded with the upper and lower side of transmission tube 4-16 respectively, at the external surface of transmission tube 4-16 the six square tube wall 4-24 that match with the hexagonal internal bore of upper flange 4-14 and lower flange 4-15 are arranged; Sleeve pipe 4-17 is set in the outside of the cylindrical section 4-25 of transmission tube 4-16, is provided with bearing 4-20 between sleeve pipe 4-17 and upper flange 4-14 and the lower flange 4-15; The toroidal cavity 4-26 that defeated slurry is arranged in the inboard of sleeve pipe 4-17, the upper and lower of cavity 4-26 is respectively equipped with rotary packing ring 4-19, on overcoat 4-17, have the accessibke porosity 4-28 that feed pipe for mortar 4-11 communicates with cavity 4-26 outside making, on transmission tube 4-16, have the inner via hole 4-29 that feed pipe for mortar 2 is communicated with cavity 4-26.Because rotating spray device 4 is arranged on the below of unit head 5, therefore effectively solved the leakage problem of concrete.Other composition is identical with the specific embodiment one with annexation.

The specific embodiment three: what present embodiment and the specific embodiment one, two were different is: 2 fens upper slurry-conveying tube 2-4 of feed pipe for mortar and lower slurry-conveying tube 2-5, the upper slurry-conveying tube 2-4 that is connected with the defeated slurry notes of rotation concrete device 4 is located in the drilling tool 1, lower slurry-conveying tube 2-5 is fixed on the outside of the drilling rod 1-2 of drilling tool 1, and the lower end one bend pipe 2-6 of upper slurry-conveying tube 2-4 is connected with the upper end of lower slurry-conveying tube 2-5.Other composition is identical with the specific embodiment one, two with annexation.

Claims

1, the borehole pump pouring large flow concrete rotary grout-jet expands end piling method, it is characterized in that holing to design elevation, with the hole wall inject high pressure medium of the jet blower that is installed in the Grout-jetting pipe below on the drilling tool, when spraying, make drilling tool rotate also play up and down to bottom, stake hole.

2, borehole pump pouring large flow concrete rotary grout-jet according to claim 1 expands end piling method, it is characterized in that described high-pressure medium is a cement paste, and its water/binder ratio is 1: 0.4-0.5; The pressure of penetrating slurry is at 8-20MPa; Penetrating the slurry amount is the long-pending 15%-25% of pile body; Drilling tool is when the inject high pressure medium, and the height of play is in 2 meters apart from bottom, stake hole up and down.

3, borehole pump pouring large flow concrete rotary grout-jet according to claim 1 expands end piling method, it is characterized in that finishing expanding after the end penetrates slurry, and Grout-jetting pipe connects airduct and air compressor machine with snap joint immediately, starts air compressor machine and press wind in Grout-jetting pipe.

4, borehole pump pouring large flow concrete rotary grout-jet according to claim 1 expands end piling method, it is characterized in that pump concrete limit, limit carries drilling tool, and makes drill bit be embedded in 1.5m-3m in the concrete.

5, borehole pump pouring large flow concrete rotary grout-jet bottom expanding pile forming device, it is characterized in that in the top of drilling tool (1) the defeated slurry of rotation being installed annotates concrete device (4), on drilling tool (1), be fixedly connected with feed pipe for mortar (2), the jet blower (3) of feed pipe for mortar (2) lower end is located at the below of next joint blade (1-1) of drilling tool (1), and close drill bit plate shoulder (8) one sides of jet blower (3), and laterally be shorter than shoulder (8).

6, borehole pump pouring large flow concrete rotary grout-jet bottom expanding pile forming device according to claim 5, it is characterized in that feed pipe for mortar (2) bottom is a three-port structure, the end of the side pipe of threeway (2-1) is jet blower (3), and the end of the lower end arm (2-2) of threeway is provided with removable plug (2-3).

7, borehole pump pouring large flow concrete rotary grout-jet bottom expanding pile forming device according to claim 5, it is characterized in that rotating defeated slurry and annotate the top that concrete device (4) is arranged on unit head (5), the defeated slurry of this rotation is annotated concrete device (4) by the adpting flange (4-1) that is connected with injecting concrete pipe (6), the flanged (FLGD) sealing short tubes in two ends (4-2), the short tube support (4-3) of fixedlying connected with unit head (5) shell, the lower flange (44) that is connected with the power transmission shaft (5-1) of logical concrete in the unit head (5), interior pipe (4-5), annular flower stand (4-6), envelope concrete glue envelope (4-7), rotary packing ring (4-8) is formed; The upper end of interior pipe (4-5) is connected with injecting concrete pipe (6), fixedlys connected with lower flange (4-4) in the lower end of interior pipe (4-5), and sealing short tube (4-2) and short tube support (4-3) are set in the outside of interior pipe (4-5) from top to bottom; The upper and lower side of sealing short tube (4-2) is fixedlyed connected with short tube support (4-3) with adpting flange (4-1) respectively, is provided with envelope concrete glue envelope (4-7) between sealing short tube (4-2) and interior pipe (4-5); Flower stand (4-6) is arranged on the centre of interior pipe (4-5) and short tube support (4-3), the upper and lower of flower stand (4-6) is equipped with rotary packing ring (4-8), along the circumferential direction be provided with a plurality of through holes (4-9) at flower stand (4-6), there is the cavity (4-10) of defeated slurry in the outside in the flower stand (4-6), on the tube wall of short tube support (4-3), have the accessibke porosity (4-12) that feed pipe for mortar (4-11) is connected with cavity (4-10) outside making, on interior pipe (4-5) tube wall, have the inner via hole (4-13) that feed pipe for mortar (2) is connected with cavity (4-10).

8, borehole pump pouring large flow concrete rotary grout-jet bottom expanding pile forming device according to claim 5, it is characterized in that rotating defeated slurry and annotate the below that concrete devices (4) are arranged on unit head (5), the upper flange (4-14) that the defeated slurry notes concrete devices of this rotation (4) are connected by the drive flange with unit head (5), the lower flange (4-15) that is connected with the drilling rod (1-2) of drilling tool (1), transmission tube (4-16), sleeve pipe (4-17), rotary packing ring (4-19), bearing (4-20), on carry on the back cap (4-21) and lower back cap (4-22) is formed; Last back of the body cap (4-21) and lower back cap (4-22) are embedded in respectively in the groove (4-23) of upper flange (4-14) and lower flange (4-15) upper and lower end face, last back of the body cap (4-21) and lower back cap (4-22) are threaded with the upper and lower side of transmission tube (4-16) respectively, at the external surface of transmission tube (4-16) the six square tube walls (4-24) that match with the hexagonal internal bore of upper flange (4-14) and lower flange (4-15) are arranged; Sleeve pipe (4-17) is set in the outside of the cylindrical section (4-25) of transmission tube (4-16), is provided with bearing (4-20) between sleeve pipe (4-17) and upper flange (4-14) and the lower flange (4-15); The toroidal cavity (4-26) that defeated slurry is arranged in the inboard of sleeve pipe (4-17), the upper and lower of cavity (4-26) is respectively equipped with rotary packing ring (4-19), on overcoat (4-17), have the accessibke porosity (4-28) that feed pipe for mortar (4-11) communicates with cavity (4-26) outside making, on transmission tube (4-16), have the inner via hole (4-29) that feed pipe for mortar (2) is communicated with cavity (4-26).

9, borehole pump pouring large flow concrete rotary grout-jet bottom expanding pile forming device according to claim 5 is characterized in that feed pipe for mortar (2) is fixed on the inwall of drilling tool (1).

10, borehole pump pouring large flow concrete rotary grout-jet bottom expanding pile forming device according to claim 5, it is characterized in that feed pipe for mortar (2) divides upper slurry-conveying tube (2-4) and lower slurry-conveying tube (2-5), the upper slurry-conveying tube (2-4) that is connected with the defeated slurry notes concrete devices of rotation (4) is located in the drilling tool (1), lower slurry-conveying tube (2-5) is fixed on the outside of the drilling rod (1-2) of drilling tool (1), and lower end one bend pipe (2-6) of upper slurry-conveying tube (2-4) is connected with the upper end of lower slurry-conveying tube (2-5).