CN113914308A - Construction method combining forward circulation and reverse circulation of cast-in-situ bored pile - Google Patents
Construction method combining forward circulation and reverse circulation of cast-in-situ bored pile Download PDFInfo
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- CN113914308A CN113914308A CN202111140058.2A CN202111140058A CN113914308A CN 113914308 A CN113914308 A CN 113914308A CN 202111140058 A CN202111140058 A CN 202111140058A CN 113914308 A CN113914308 A CN 113914308A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D55/00—Endless track vehicles
- B62D55/06—Endless track vehicles with tracks without ground wheels
- B62D55/065—Multi-track vehicles, i.e. more than two tracks
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Abstract
The invention provides a construction method for combining forward circulation and reverse circulation of a bored pile, which is realized by utilizing a forward circulation system and a reverse circulation system of the bored pile, which comprise a drilling machine, a pile casing, a slurry tank, a slurry pump, a screen filtering device, a vibrating screen, a slurry receiving disc and a cyclone sand remover, and then the drilling machine, the pile casing, the slurry tank, the slurry pump, the screen filtering device, the vibrating screen, the slurry receiving disc and the cyclone sand remover are mutually connected by using pipelines and valves according to the forward circulation process and the reverse circulation process of the bored pile, and the forward circulation or the reverse circulation is started by opening the corresponding valves under different geological conditions. The cast-in-situ bored pile construction method provided by the invention can be suitable for cast-in-situ bored pile construction under complex geological conditions, the construction efficiency is improved, and the quality of formed holes is ensured.
Description
Technical Field
The invention relates to the technical field of cast-in-situ bored piles, in particular to a construction method for combining forward circulation and reverse circulation of a cast-in-situ bored pile.
Background
The development of buildings, traffic and municipal engineering such as super high-rise buildings, large-span bridges and the like enables the foundation load of the buildings to be larger and larger, higher requirements on the bearing capacity and deformation of the foundation are provided, the diameter of an engineering pile is continuously enlarged, the pile foundation is deeper and deeper, the faced geological conditions are also more and more complex, particularly in soft soil areas, the properties of upper and lower soil layers have larger differences, the existing construction requirements are difficult to meet through the original construction process, the hole forming efficiency is low, and the hole forming quality is not ideal.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
The invention mainly aims to solve the technical problems that the existing cast-in-situ bored pile construction system cannot meet the construction requirements of geological conditions at different depths, the hole forming rate is low, and the hole forming quality is not ideal.
The invention provides a construction method for combining positive circulation and reverse circulation of a cast-in-situ bored pile, which comprises the following steps of:
(1) place for arrangement
A drilling machine is in place, a pile casing is embedded near the drilling machine, a mud box is placed, then a pile hole is communicated with the pile casing through a first pipeline, the mud box is communicated with the pile casing through a third pipeline, and a second valve is arranged on the third pipeline;
then parking a sand-stone separation device to a working site, wherein the sand-stone separation device comprises a crawler-type transport vehicle, and a slurry pump, a screen filtering device, a vibrating screen, a slurry receiving disc and a cyclone desander which are arranged on the crawler-type transport vehicle, the screen filtering device and the vibrating screen are arranged adjacently, and the slurry receiving disc is arranged below the screen filtering device and the vibrating screen;
a second pipeline is arranged between the casing and the mud pump, and a first valve is arranged on the second pipeline; a fifth pipeline is connected between the slurry receiving disc and the slurry box, and a sixth valve is arranged on the fifth pipeline; a fourth pipeline is connected between the mud pump and the screen filtering device, and a fifth valve is arranged on the fourth pipeline;
the cyclone desander is erected above the vibrating screen through a bracket, and a top flow port of the cyclone desander flows into the slurry receiving disc through a seventh pipeline; a feed port of the cyclone desander is connected with the fourth pipeline between the fifth valve and the slurry pump through a sixth pipeline, and a seventh valve is arranged on the sixth pipeline; the bottom flow port of the cyclone desander flows to the vibrating screen through an eighth pipeline;
a ninth pipeline is connected to the sixth pipeline between the seventh valve and the mud pump, and an eighth valve is arranged on the ninth pipeline; a tenth pipeline is connected to the second pipeline between the first valve and the mud pump, the tenth pipeline is connected to the ninth pipeline, and a ninth valve is arranged on the tenth pipeline; the ninth pipeline is connected with a drill rod of the drilling machine;
(2) drilling for quicksand layer, pebble layer, sand layer and permeable layer
The drilling machine drills, only the first valve and the eighth valve are opened, the mud pump is started to carry out positive circulation, and the mud in positive circulation moves towards the casing → the mud pump → a drill rod of the drilling machine → a drill bit of the drilling machine → the pile hole → the casing;
(3) drilling of formations other than quicksand, pebble, sand and permeable beds
Drilling by a drilling machine, opening only the ninth valve, the fifth valve, the sixth valve and the second valve, and starting the mud pump to perform reverse circulation, wherein the reverse circulation mud moves towards the pile hole → a drill bit of the drilling machine → a drill rod of the drilling machine → the mud pump → the screen filtering device → the vibrating screen → the mud receiving disc → the mud box → the protective sleeve → the pile hole;
or the drilling machine is in a drilling state, only the ninth valve, the fifth valve, the sixth valve, the seventh valve and the second valve are opened, the direction of the reverse circulation mud is divided into two paths, the direction of the first path of mud is the pile hole → the drill bit of the drilling machine → the drill rod of the drilling machine → the mud pump → the screen filtering device → the vibrating screen → the mud receiving disc → the mud tank → the pile casing → the pile hole, and the direction of the second path of mud is the pile hole → the drill bit of the drilling machine → the drill rod of the drilling machine → the mud pump → the cyclone sand remover → the vibrating screen and the mud receiving disc → the mud tank → the pile casing.
In an alternative embodiment of the invention, the screen filtering device comprises a box body, a slurry inlet arranged at the top of the box body, a filter screen obliquely arranged in the box body and used for filtering coarse sand in slurry, and a sliding plate hinged with the bottom of the box body and used for guiding the coarse sand filtered by the filter screen to be discharged; the mud pump is connected with the mud inlet pipeline, and a mud outlet used for enabling filtered mud to flow to the vibrating screen is formed in the box body below the filter screen.
In an alternative embodiment of the present invention, the filter screen includes a first filter portion adjacent to the side of the slurry inlet, and a second filter portion adjacent to the side of the sliding plate, wherein the filter holes of the first filter portion are elongated, and the filter holes of the second filter portion are circular.
In an optional embodiment of the invention, the vibrating screen comprises a first vibrating screen and a second vibrating screen engaged with the first vibrating screen, and both the underflow port of the cyclone sand remover and the mud outlet on the box body flow to the first vibrating screen.
In an optional embodiment of the present invention, each of the first vibrating screen and the second vibrating screen is provided with a spray pipe for cleaning the screen material.
Has the advantages that: the invention provides a construction method for combining forward circulation and reverse circulation of a bored pile, which is realized by utilizing a forward circulation system and a reverse circulation system of the bored pile, which comprise a drilling machine, a pile casing, a slurry tank, a slurry pump, a screen filtering device, a vibrating screen, a slurry receiving disc and a cyclone sand remover, and then the drilling machine, the pile casing, the slurry tank, the slurry pump, the screen filtering device, the vibrating screen, the slurry receiving disc and the cyclone sand remover are mutually connected by using pipelines and valves according to the forward circulation process and the reverse circulation process of the bored pile, and the forward circulation or the reverse circulation is started by opening the corresponding valves under different geological conditions. The cast-in-situ bored pile construction method provided by the invention can be suitable for cast-in-situ bored pile construction under complex geological conditions, the construction efficiency is improved, and the quality of formed holes is ensured.
Drawings
Fig. 1 is a schematic structural diagram of a forward and reverse circulation construction system of a cast-in-situ bored pile according to the present invention.
FIG. 2 is a schematic view of the structure of a sand separating apparatus of the present invention.
Fig. 3 is a schematic structural diagram of a screen filtering device according to the present invention.
Figure 4 is a cross-sectional view of a screen filter arrangement of the present invention.
The reference numbers are as follows:
10-a drilling machine; 20-protecting the cylinder; 30-a mud tank; 40-a slurry pump; 50-screen filtration unit; 60-vibrating screen; 70-slurry receiving disc; 80-cyclone desander; 90-a first conduit; 100-pile hole; 110-a second conduit; 120-a third conduit; 130-a fourth conduit; 140-a fifth conduit; 150-a first valve; 160-a second valve; 170-a fifth valve; 180-a sixth valve; 190-a feed inlet; 200-a sixth conduit; 210-top flow port; 220-a seventh conduit; 230-underflow port; 240-an eighth conduit; 250-a seventh valve; 260-a ninth conduit; 270-an eighth valve; 280-a tenth conduit; 400-a ninth valve; 290-tracked carrier; 300-a box body; 310-a mud inlet; 320-a filter screen; 330-a sliding plate; 340-a mud outlet; 350-a first filter part; 360-a second filter part; 470-slide carriage; 370-a first vibrating screen; 380-a second vibrating screen; 390-shower pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a construction method for combining forward circulation and reverse circulation of a cast-in-situ bored pile, which combines the original forward circulation and reverse circulation construction system (see figure 1) of the cast-in-situ bored pile, wherein the method specifically comprises the following steps:
(1) place for arrangement
Referring to fig. 1, a drilling machine 10 is in place, a pile casing 20 is buried near the drilling machine 10, a mud tank 30 is placed, a pile hole 100 is communicated with the pile casing 20 through a first pipeline 90, the mud tank 30 is communicated with the pile casing 20 through a third pipeline 120, and a second valve 160 is arranged on the third pipeline 120;
then, the sand-gravel separation equipment is parked to a working site, wherein, referring to fig. 2, the sand-gravel separation equipment comprises a crawler-type transport vehicle 290, and a mud pump 40, a screen filtering device 50, a vibrating screen 60, a mud receiving disc 70 and a cyclone desander 80 which are arranged on the crawler-type transport vehicle 290, wherein the screen filtering device 50 and the vibrating screen 60 are adjacently arranged, and the mud receiving disc 70 is arranged below the screen filtering device 50 and the vibrating screen 60;
referring to fig. 1, a second pipeline 110 is arranged between the casing 20 and the mud pump 40, and a first valve 150 is arranged on the second pipeline 110; a fifth pipeline 140 is connected between the slurry receiving plate 70 and the slurry tank 30, and a sixth valve 180 is arranged on the fifth pipeline 140; a fourth pipeline 130 is connected between the mud pump 40 and the screen filtering device 50, and a fifth valve 170 is arranged on the fourth pipeline 130;
referring to fig. 2, the cyclone desander 80 is erected above the vibrating screen 60 through a bracket, and a top flow port 210 of the cyclone desander 80 flows into the slurry receiving plate 70 through a seventh pipe 220; the feed port 190 of the cyclone desander 80 is connected with the fourth pipeline 130 between the fifth valve 170 and the mud pump 40 through a sixth pipeline 200, and a seventh valve 250 is arranged on the sixth pipeline 200; the underflow port 230 of the cyclone desander 80 flows to the vibrating screen 60 through the eighth pipe 240;
referring to fig. 1, a ninth pipe 260 is connected to the sixth pipe 200 between the seventh valve 250 and the mud pump 40, and an eighth valve 270 is disposed on the ninth pipe 260; a tenth pipe 280 is connected to the second pipe 110 between the first valve 150 and the mud pump 40, the tenth pipe 280 is connected to the ninth pipe 260, and a ninth valve 400 is disposed on the tenth pipe 280; the ninth conduit 260 connects the drill rods of the drilling rig 10;
(2) drilling for quicksand layer, pebble layer, sand layer and permeable layer
Drilling by the drilling machine 10, only opening the first valve 150 and the eighth valve 270, and starting the mud pump 40 to perform a positive circulation, wherein the mud in the positive circulation moves towards the casing 20 → the mud pump 40 → the drill rod of the drilling machine 10 → the drill bit of the drilling machine 10 → the pile hole 100 → the casing 20;
(3) drilling of formations other than quicksand, pebble, sand and permeable beds
When the drilling machine 10 drills, only the ninth valve 400, the fifth valve 170, the sixth valve 180, and the second valve 160 are opened, and the mud pump 40 is started to perform a reverse circulation, in which the mud in the reverse circulation moves toward the pile hole 100 → the drill bit of the drilling machine 10 → the drill rod of the drilling machine 10 → the mud pump 40 → the screen filter 50 → the vibrating screen 60 → the mud receiving plate 70 → the mud tank 30 → the casing 20 → the pile hole 100.
Alternatively, the drilling machine 10 is drilling, and only the ninth valve 400, the fifth valve 170, the sixth valve 180, the seventh valve 250, and the second valve 160 are opened, and the reverse circulation mud is divided into two paths, the first path is the mud path of the pile hole 100 → the drill bit of the drilling machine 10 → the drill rod of the drilling machine 10 → the mud pump 40 → the mesh filter device 50 → the vibrating screen 60 → the mud receiving plate 70 → the mud tank 30 → the casing 20 → the pile hole 100, and the second path is the mud path of the pile hole 100 → the drill bit of the drilling machine 10 → the drill rod of the drilling machine 10 → the mud pump 40 → the cyclone sand remover 80 → the vibrating screen 60 and the mud receiving plate 70 → the mud tank 30 → the casing 20.
Referring to fig. 3, in an alternative embodiment of the present invention, the screen filtering apparatus 50 includes a housing 300, a slurry inlet 310 disposed at the top of the housing 300, a screen 320 disposed in the housing 300 in an inclined manner for filtering coarse sand in slurry, and a slide plate 330 hinged to the bottom of the housing 300 for guiding the coarse sand filtered by the screen 320 to be discharged; the mud pump 40 is connected to the mud inlet 310 through a pipe, and a mud outlet 340 through which filtered mud flows to the vibrating screen 60 is formed in the case 300 under the filter screen 320.
Referring to fig. 3, in an alternative embodiment of the present invention, the filter screen 320 includes a first filter portion 350 adjacent to one side of the slurry inlet 310 and a second filter portion 360 adjacent to one side of the sliding plate 330, wherein the filter holes of the first filter portion 350 are elongated and the filter holes of the second filter portion 360 are circular. In this embodiment, the main function of the elongated filtering holes of the first filtering portion 350 is to prevent the sludge eluted from the sand from blocking the filtering holes, and simultaneously reduce the contact friction to guide the washed sand to move downward quickly, and the circular filtering holes of the second filtering portion 360 can prevent the washed large sand from falling under the filtering net 320.
Referring to fig. 4, a chute 470 for guiding the slurry to the slurry outlet 340 is provided in the casing 300 below the first filter part 350. In this embodiment, the height of the mud outlet 340 from the bottom of the casing 300 is a certain height, and the side of the slide carriage 470 located at the mud outlet 340 is lower than the bottom edge of the mud outlet 340, so as to prevent the large sand falling into the casing 300 from flowing into the subsequent vibrating screen, and only allow the fine sand of small particles to flow to the vibrating screen 60, and the slide carriage 470 is mainly arranged to make the fine particles in the filtered mud finally flowing to the vibrating screen for subsequent recovery.
Referring to fig. 4, in an alternative embodiment of the present invention, a drain port is provided on a bottom plate of the case 300 under the second filter part 360, and a valve is installed on the drain port. The valve can facilitate the discharge of the slurry accumulated in the box and the cleaning of the large sand in the screen filtering device.
Referring to FIG. 2, in an alternative embodiment of the present invention, the vibrating screens 60 include a first vibrating screen 370 and a second vibrating screen 380 engaged with the first vibrating screen 370, and both the underflow opening 230 of the cyclone desander 80 and the mud outlet 340 of the box 300 are directed to the first vibrating screen 370. In this embodiment, the vibrating screen 60 is provided with 2 places which can make fine sand better separated from mud, and simultaneously, the vibrating screen can be better cleaned by matching with a spraying pipeline.
Referring to fig. 2, in an alternative embodiment of the present invention, each of the first vibrating screen 370 and the second vibrating screen 380 is provided with a spraying pipe 390 for cleaning the screen material.
In summary, the invention provides a construction method combining forward circulation and reverse circulation of a bored pile, which is realized by utilizing a forward circulation system and a reverse circulation system of the bored pile, wherein the forward circulation system and the reverse circulation system comprise a drilling machine, a pile casing, a slurry box, a slurry pump, a screen filtering device, a vibrating screen, a slurry receiving disc and a cyclone sand remover, the drilling machine, the pile casing, the slurry box, the slurry pump, the screen filtering device, the vibrating screen, the slurry receiving disc and the cyclone sand remover are connected with each other by using pipelines and valves according to the forward circulation process and the reverse circulation process of the bored pile, and the forward circulation or the reverse circulation is started by opening the corresponding valves under different geological conditions. The cast-in-situ bored pile construction method provided by the invention can be suitable for cast-in-situ bored pile construction under complex geological conditions, the construction efficiency is improved, and the quality of formed holes is ensured.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (5)
1. A construction method combining forward circulation and reverse circulation of a cast-in-situ bored pile is characterized by comprising the following steps:
(1) place for arrangement
A drilling machine is in place, a pile casing is embedded near the drilling machine, a mud box is placed, then a pile hole is communicated with the pile casing through a first pipeline, the mud box is communicated with the pile casing through a third pipeline, and a second valve is arranged on the third pipeline;
then parking a sand-stone separation device to a working site, wherein the sand-stone separation device comprises a crawler-type transport vehicle, and a slurry pump, a screen filtering device, a vibrating screen, a slurry receiving disc and a cyclone desander which are arranged on the crawler-type transport vehicle, the screen filtering device and the vibrating screen are arranged adjacently, and the slurry receiving disc is arranged below the screen filtering device and the vibrating screen;
a second pipeline is arranged between the casing and the mud pump, and a first valve is arranged on the second pipeline; a fifth pipeline is connected between the slurry receiving disc and the slurry box, and a sixth valve is arranged on the fifth pipeline; a fourth pipeline is connected between the mud pump and the screen filtering device, and a fifth valve is arranged on the fourth pipeline;
the cyclone desander is erected above the vibrating screen through a bracket, and a top flow port of the cyclone desander flows into the slurry receiving disc through a seventh pipeline; a feed port of the cyclone desander is connected with the fourth pipeline between the fifth valve and the slurry pump through a sixth pipeline, and a seventh valve is arranged on the sixth pipeline; the bottom flow port of the cyclone desander flows to the vibrating screen through an eighth pipeline;
a ninth pipeline is connected to the sixth pipeline between the seventh valve and the mud pump, and an eighth valve is arranged on the ninth pipeline; a tenth pipeline is connected to the second pipeline between the first valve and the mud pump, the tenth pipeline is connected to the ninth pipeline, and a ninth valve is arranged on the tenth pipeline; the ninth pipeline is connected with a drill rod of the drilling machine;
(2) drilling for quicksand layer, pebble layer, sand layer and permeable layer
The drilling machine drills, only the first valve and the eighth valve are opened, the mud pump is started to carry out positive circulation, and the mud in positive circulation moves towards the casing → the mud pump → a drill rod of the drilling machine → a drill bit of the drilling machine → the pile hole → the casing;
(3) drilling of formations other than quicksand, pebble, sand and permeable beds
Drilling by a drilling machine, opening only the ninth valve, the fifth valve, the sixth valve and the second valve, and starting the mud pump to perform reverse circulation, wherein the reverse circulation mud moves towards the pile hole → a drill bit of the drilling machine → a drill rod of the drilling machine → the mud pump → the screen filtering device → the vibrating screen → the mud receiving disc → the mud box → the protective sleeve → the pile hole;
or the drilling machine is in a drilling state, only the ninth valve, the fifth valve, the sixth valve, the seventh valve and the second valve are opened, the direction of the reverse circulation mud is divided into two paths, the direction of the first path of mud is the pile hole → the drill bit of the drilling machine → the drill rod of the drilling machine → the mud pump → the screen filtering device → the vibrating screen → the mud receiving disc → the mud tank → the pile casing → the pile hole, and the direction of the second path of mud is the pile hole → the drill bit of the drilling machine → the drill rod of the drilling machine → the mud pump → the cyclone sand remover → the vibrating screen and the mud receiving disc → the mud tank → the pile casing.
2. The cast-in-situ bored pile forward and backward circulation combined construction method according to claim 1, wherein the screen filtering device comprises a box body, a slurry inlet provided at the top of the box body, a screen obliquely provided in the box body for filtering coarse sand in slurry, and a slide plate hinged to the bottom of the box body for guiding the coarse sand filtered by the screen to be discharged; the mud pump is connected with the mud inlet pipeline, and a mud outlet used for enabling filtered mud to flow to the vibrating screen is formed in the box body below the filter screen.
3. The cast-in-situ bored pile forward and backward circulation combined construction method according to claim 2, wherein the filter net includes a first filter portion adjacent to the side of the slurry inlet and a second filter portion adjacent to the side of the slide plate, and the filter holes of the first filter portion are elongated and the filter holes of the second filter portion are circular.
4. The method of claim 3, wherein the vibrating screen comprises a first vibrating screen and a second vibrating screen connected with the first vibrating screen, and both the underflow port of the cyclone sand remover and the slurry outlet on the box body flow to the first vibrating screen.
5. The method for constructing the bored pile by combining the forward circulation and the reverse circulation according to claim 4, wherein each of the first vibrating screen and the second vibrating screen is provided with a spray pipe for cleaning the screen material.
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