CN114411787B - Well point dewatering method for steel cofferdam in water - Google Patents
Well point dewatering method for steel cofferdam in water Download PDFInfo
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- CN114411787B CN114411787B CN202210125684.2A CN202210125684A CN114411787B CN 114411787 B CN114411787 B CN 114411787B CN 202210125684 A CN202210125684 A CN 202210125684A CN 114411787 B CN114411787 B CN 114411787B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/02—Restraining of open water
- E02D19/04—Restraining of open water by coffer-dams, e.g. made of sheet piles
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Abstract
The invention discloses a method for lowering water steel cofferdam well points, which comprises the steps of preparing a positioning device, installing the positioning device on a temporary construction platform during construction, positioning the positioning device right above a drill hole, vertically inserting a well pipe unit into the positioning device, inserting the lower end of the well pipe unit into the drill hole, and then temporarily fixing the well pipe unit by the positioning device; vertically inserting a well pipe unit into the positioning device from top to bottom, aligning and communicating ports of adjacent well pipe units, welding and stabilizing the joints of the adjacent well pipe units, releasing the welded and stabilized well pipe by the positioning device, inserting the lower end of the uppermost well pipe unit into the drill hole, and temporarily fixing the well pipe by the positioning device; the steps are repeated until the lower end of the well pipe is inserted to the designed elevation, and the well pipe unit shaking prevention device has the effect of improving the shaking problem of the well pipe unit.
Description
Technical Field
The invention relates to the field of well point dewatering, in particular to a well point dewatering method for a steel cofferdam in water.
Background
With the development of bridge construction, a large number of large-span bridges spanning rivers, rivers and sea are constructed, the deepwater foundation bearing platform is a control project of large projects, the construction is often not easy to control due to the influence of natural conditions and technical reasons, the construction progress is seriously influenced, and the deepwater foundation bearing platform steel cofferdam bottom sealing construction technology is the key of success and failure of bridge construction.
The dewatering wells are arranged outside the cofferdam to reduce the water head pressure and reduce the back cover thickness, the cofferdam can be applied to deep water foundations of shallow sea silt water-rich strata and projects with similar geological conditions, and the water pumping and drainage are simultaneously carried out through the plurality of dewatering wells at the periphery of the cofferdam, so that the water level elevation of confined water below the back cover concrete of the cofferdam is effectively reduced, and the water head pressure at the bottom of a foundation pit is reduced.
In the related technology, the well pipe is a main component of the dewatering well, the well pipe is formed by welding a plurality of sections and is hoisted into a borehole in a whole section by adopting a tower crane or a crane.
With respect to the related art among the above, the inventors consider that the following drawbacks exist: because the well pipe is long and small in rigidity, the well pipe is easy to shake greatly in a hoisting mode, so that the risk of collision with other equipment exists, and an improvement space is provided.
Disclosure of Invention
The invention provides a method for lowering water steel cofferdam well points in water in order to reduce the shaking probability in the process of lowering a well casing.
The invention provides a well point dewatering method for a steel cofferdam in water, which adopts the following technical scheme:
a well point dewatering method for a steel cofferdam in water comprises the following steps:
s1: early preparation: transporting the pile casing, the well pipe units, the positioning device and the drilling machine to a construction site, and building a temporary construction platform at the periphery of the cofferdam;
s2: positioning and mounting: marking is done at the on-site well logging position, and a drilling machine is arranged on a temporary construction platform;
s3: and (3) casing construction: inserting and drilling a casing to a well position;
s4: drilling to form a hole: drilling a hole at the well site;
s5: construction of well pipes: installing a positioning device on the temporary construction platform, wherein the positioning device is positioned right above the drill hole, vertically inserting the well pipe unit into the positioning device, inserting the lower end of the well pipe unit into the drill hole, and then temporarily fixing the well pipe unit by the positioning device;
s6: well pipe welding: vertically inserting a well pipe unit into the positioning device from top to bottom, aligning and communicating ports of adjacent well pipe units, welding and stabilizing the joints of the adjacent well pipe units, releasing the welded and stabilized well pipe by the positioning device, inserting the lower end of the uppermost well pipe unit into the drill hole, and temporarily fixing the well pipe by the positioning device;
s7: repeating S5 and S6 until the lower end of the well pipe is inserted to the designed depth;
s8: filling and cementing wells: filling the filter material into a gap between the inner wall of the pile casing and the outer wall of the well pipe;
s9: and (7) precipitation construction.
Through adopting above-mentioned technical scheme, the well casing unit is transferred the operation and is gone on in turn with the weldment work of adjacent well casing unit to make the well casing segmentation get into in the drilling, replaced traditional integral hoisting's mode, positioner plays the effect of location and interim fixed, has not only improved the rocking problem that well casing hoist and mount process produced, has still accomplished weldment work, is favorable to improving the efficiency of construction.
Preferably, in S5, the positioning device includes a frame and two parallel conveying rollers horizontally and rotatably connected in the frame, the two conveying rollers are provided with a plurality of baffles circumferentially distributed on the outer circumferential surfaces of the conveying rollers, the frame is provided with a driving member for driving the two conveying rollers to synchronously and reversely rotate, the two sides of the well pipe unit are provided with a plurality of positioning strips, and the positioning strips on the same side are distributed along the length direction of the well pipe unit; when the well pipe is positioned, the well pipe unit is vertically inserted between two conveying rollers, baffles of the two conveying rollers are respectively abutted against the lower end faces of the positioning strips on two sides of the well pipe unit, and the well pipe unit is supported; when the well pipe is lowered, the driving part drives the conveying roller to rotate and drives the baffle plates on two sides of the well pipe unit to swing downwards, and the well pipe unit moves downwards and is inserted into the drill hole.
Through adopting above-mentioned technical scheme, make the baffle of two conveying rollers prop up the well casing unit jointly, play the effect of interim fixed well casing unit, the driving piece orders about the synchronous reverse rotation of conveying roller, make the baffle lower hem, thereby realize the function that the well casing moved down, because the separation blade circumference of every conveying roller distributes in the conveying roller outer peripheral face, and the location strip of well casing unit distributes along well casing unit length direction, when making the baffle be close to well casing department and taking one's place, all there is a horizontal bar that corresponds to be located this baffle top, so that when the baffle of below released the well casing unit, the well casing unit can in time be accepted to the baffle that is located the top, be favorable to stably transferring the well casing unit.
Preferably, the driving part comprises a motor and two gears, the two gears are respectively and fixedly sleeved on the two conveying rollers, and the two gears are in meshing transmission.
Through adopting above-mentioned technical scheme, under the drive of motor and the meshing transmission of gear, be favorable to realizing the synchronous reverse function of conveying roller.
Preferably, the frame is provided with a positioning ring, the positioning ring is positioned above the two conveying rollers, and when the well pipe unit is inserted into the positioning ring, the well pipe unit is positioned between the two conveying rollers.
By adopting the technical scheme, the positioning ring has the function of positioning the conveying roller so as to facilitate the vertical lowering operation of the well pipe and the butt joint operation of the adjacent well pipe units.
Preferably, the supporting surface of the baffle plate is provided with a clamping groove, the clamping groove extends along the radial direction of the conveying roller, one end of the clamping groove, which is far away from the conveying roller, is provided with an opening, and when the baffle plate supports the corresponding positioning strip, the positioning strip is clamped in the clamping groove.
By adopting the technical scheme, the clamping groove has a limiting effect on the positioning strip, and is favorable for keeping the vertical state of the well pipe unit in the rotating process of the conveying roller.
Preferably, two vertical grooves which are opposite to each other are formed in the inner side wall of the positioning ring, the vertical grooves are vertically extended and are provided with openings at two ends, and when the well pipe unit penetrates through the positioning ring, the positioning strips on two sides of the well pipe unit are respectively connected to the vertical grooves on two sides of the positioning ring in a sliding mode.
Through adopting above-mentioned technical scheme, erect the groove and play limiting displacement to the location strip to reduce well tubular unit and transferring the in-process and take place pivoted probability, be favorable to improving the welding quality between the adjacent well tubular unit.
Preferably, the frame is provided with a welding platform, and the welding platform is located between the positioning ring and the conveying roller.
By adopting the technical scheme, an operator can conveniently weld the interfaces of the adjacent well pipe units on the welding platform.
Preferably, a through hole for the well pipe unit to pass through is vertically penetrated in the middle of the welding platform.
By adopting the technical scheme, the welding operation can be conveniently carried out by constructors on the peripheral side of the well pipe.
Drawings
Fig. 1 is a schematic view of the overall structure of a positioning device in a method for dewatering a well point of a steel cofferdam in water according to an embodiment of the present application.
Fig. 2 is an enlarged schematic view at a in fig. 1.
Fig. 3 is an enlarged schematic view at B in fig. 1.
Description of reference numerals: 1. a frame; 11. positioning rings; 111. a vertical slot; 12. welding a platform; 121. a through hole; 2. a well pipe unit; 21. a positioning bar; 3. a motor; 4. a conveying roller; 41. a baffle plate; 42. a card slot; 5. a gear; 6. and (7) protecting the cylinder.
Detailed Description
The present invention is described in further detail below with reference to figures 1-3.
The embodiment of the invention discloses a well point dewatering method for a steel cofferdam in water. Referring to fig. 1, a method for dewatering a well point of a steel cofferdam in water comprises the following steps:
s1: early preparation: and (4) transporting the pile casing 6, the well pipe units 2, the positioning device and the drilling machine to a construction site, and building a temporary construction platform on the periphery of the cofferdam.
S2: positioning and mounting: the well position is measured and marked on the construction site according to the dewatering well plane layout drawing and the site condition, if the well point is provided with an obstacle, the position of the hole position can be properly adjusted to be beneficial to drilling, and if the ground obstacle is not easy to clear or influenced by other construction conditions, the well position can not be properly adjusted when the original well position is arranged.
After the well position is adjusted, digging a well hole and burying the mouth protecting pipe, inserting the bottom opening of the mouth protecting pipe into an original soil layer when the mouth protecting pipe is inserted and punched, sealing the outside of the pipe by using cohesive soil to prevent the outside of the pipe from returning grout during construction, and enabling the upper part of the mouth protecting pipe to be 0.10-0.30 m higher than the ground.
And then, mounting the drilling machine on a temporary construction platform, wherein when the drilling machine is mounted, in order to ensure the verticality of the hole, the machine platform is horizontally mounted on the temporary construction platform, the hook is aligned with the center of the hole, three points of the hook, the turntable and the center of the hole form a line, the hole is tightly closed, two drill collars are arranged at the joint of the drill bit and the drill rod, and the bent drill rod cannot be put into the hole.
S3: and (3) construction of a pile casing 6: and (3) inserting and drilling the pile casing 6 to the well position, wherein the pile casing 6 is tracked by adopting a ∅ 820 steel pipe, and the pile casing 6 is inserted and drilled again if the pile casing cannot be utilized by comprehensively considering the original construction platform or trestle tubular pile according to the actual situation on site.
S4: drilling to form a hole: and (3) drilling at the well position, wherein a reverse circulation drilling machine is adopted for drilling, the mud proportion is controlled to be 1.10-1.15 in the drilling process, the hole cleaning and slurry changing operation is carried out after the hole is drilled to the designed depth, and the mud proportion is adjusted to be 1.05 when the hole cleaning and slurry changing are carried out.
S5: construction of well pipes: the positioning device is installed on a temporary construction platform, the positioning device is located right above a drill hole, the well pipe unit 2 is vertically inserted into the positioning device, the lower end of the well pipe unit 2 is inserted into the drill hole, and then the positioning device fixes the well pipe unit 2 temporarily.
Referring to fig. 1 and 2, in the present embodiment, the positioning device includes a frame 1 mounted on the temporary construction platform and two conveying rollers 4 horizontally and rotatably connected in the frame 1 and parallel to each other. A plurality of baffles 41 are fixed on the two conveying rollers 4, and the baffles 41 are circumferentially distributed on the outer peripheral surfaces of the conveying rollers 4. A gap is present between the two feed rollers 4.
In addition, a driving part is installed on the machine frame 1, the driving part comprises a motor 3 and two gears 5, the motor 3 is fixed on the outer side of the machine frame 1, and an output shaft of the motor 3 is coaxially connected to one of the conveying rollers 4. Two gears 5 and two conveying rollers 4 one-to-one, two gears 5 are respectively fixed to be connected on the outer peripheral surface of the corresponding conveying roller 4 in a sleeved mode, the two gears 5 are meshed for transmission, and the purpose of synchronous reverse motion of the conveying rollers 4 is achieved under the driving of the motor 3 and the transmission of the gears 5.
A plurality of positioning strips 21 are fixed on both sides of the well pipe unit 2, the positioning strips 21 are vertical to the well pipe unit 2, and the positioning strips 21 on the same side of the well pipe unit 2 are distributed at equal intervals along the length direction of the well pipe unit 2; when the well pipe is positioned, the well pipe unit 2 is vertically inserted into a gap between two conveying rollers 4, and the baffle plates 41 of the two conveying rollers 4 are respectively abutted against the lower end faces of the positioning bars 21 on both sides of the well pipe unit 2, so that the well pipe unit 2 is supported and temporarily fixed.
When transferring the well casing, starter motor 3, motor 3 orders about two synchronous antiport of conveying roller 4 to the baffle 41 that drives to be close to 2 both sides of well casing unit down swings, and well casing unit 2 moves down and inserts in the drilling under self action of gravity. Because baffle 41 circumference of every conveying roller 4 distributes in the conveying roller 4 outer peripheral face, and well tubular unit 2's location strip 21 distributes along well tubular unit 2 length direction, when making baffle 41 be close to well casing department and taking one's place, all have a location strip 21 that corresponds to be located this baffle 41 top, so that when baffle 41 lower hem and lower well tubular unit 2 in the below, the baffle 41 that is located the top can in time accept well tubular unit 2's location strip 21, be favorable to stably lowering well tubular unit 2.
For the steadiness when improving and transferring, regarding the terminal surface of baffle 41 and 21 butt of location strip as the holding surface of baffle 41, draw-in groove 42 has been seted up to the holding surface of baffle 41, and draw-in groove 42 is along conveying roller 4's radial extension, and the one end opening setting of conveying roller 4 is kept away from to draw-in groove 42, when baffle 41 propped the location strip 21 that corresponds, location strip 21 joint is in draw-in groove 42, when baffle 41 continued to put down, and location strip 21 can slide in draw-in groove 42, is favorable to well casing unit 2 to move down steadily.
S6: well pipe welding: referring to fig. 1 and 3, in order to improve the welding quality, a positioning ring 11 is fixed at the upper end of the frame 1, the axis of the positioning ring 11 is vertical, and the positioning ring 11 is positioned above the conveying roller 4. And two vertical grooves 111 which are opposite to each other are formed in the inner side wall of the positioning ring 11, the vertical grooves 111 are vertically extended, and two ends of each vertical groove are opened, when the well pipe unit 2 penetrates through the positioning ring 11, the positioning strips 21 on two sides of the well pipe unit 2 are respectively connected to the vertical grooves 111 on two sides of the positioning ring 11 in a sliding mode, and therefore the well pipe unit 2 is prevented from rotating.
When the well pipe is lengthened, one well pipe unit 2 is vertically inserted into the positioning device from top to bottom along the axis of the positioning ring 11, the positioning strip 21 slides to the corresponding vertical groove 111, and the ports of the adjacent well pipe units 2 are aligned and communicated.
It is emphasized that the vertical slots 111 of the spacer 11 are in the same vertical plane as the snap-in slots 42 of the retainer 41, so that the quality of the connection between adjacent well tubular units 2 is improved by the positioning effect of the positioning bars 21.
In order to facilitate welding work of constructors, a horizontal welding platform 12 is fixed on the frame 1, and the welding platform 12 is positioned between the positioning ring 11 and the conveying roller 4. A through hole 121 for the well pipe unit 2 to pass through and the positioning bar 21 to pass through is vertically penetrated in the middle of the welding platform 12, so that a constructor can perform welding operation on the peripheral side of the well pipe.
After the constructor welds the kneck of adjacent well pipe unit 2 firmly, start motor 3 again, continue to release the well pipe that the welding is firm, make the well pipe unit 2 lower extreme that is located the top insert in the drilling, then motor 3 stop operation, make the well pipe firm in positioner temporarily.
S7: and repeating S5 and S6 until the lower end of the well pipe is inserted to the designed depth.
S8: filling and cementing wells: after the well casing is put well, the sand filter material is backfilled immediately, the filter material is filled into the gap between the inner wall of the casing 6 and the outer wall of the well casing along the periphery of the well casing, and the top surface height of the filter material layer is measured along with the filling.
S9: dewatering construction: and after the filter material is backfilled, washing the well by using a submersible pump within 8 hours until well water washing reaches the standard requirement, stopping washing the well if the well water contains the filter material during well washing, checking reasons, processing, reporting to waste if necessary, and sealing the well according to the well sealing requirement. Before the operation of precipitation begins, survey static water level, make the experimental operation of productive pumping, verify whether the precipitation scheme can satisfy the design requirement, verify simultaneously that circuit system is normal, check equipment such as electronic box and cable conductor, ensure that precipitation work can continuously go on.
After the pumping test of each dewatering well is finished, the working conditions of the cable and the generator 3 are combed and checked in the system, and all the pumps are started to pump water comprehensively after all the pumps are normal. Pumping water of the dewatering well is started for 8/10 of the cofferdam uniformly, and the water is increased and decreased reasonably according to the water level reduction condition. And starting the water level precipitation work in the cofferdam when the precipitation well pumps water, controlling the difference between the internal water head and the external water head of the cofferdam within 5m when precipitation starts, and lowering the water level in the cofferdam to the elevation position of the bottom of the bearing platform after precipitation data of the precipitation well is normal.
After the precipitation well starts precipitation, the automatic induction detection system is adopted to detect the water level in each precipitation well and the observation well-logging water level in the cofferdam in real time. Monitoring the water level change condition every day, checking equipment, a drainage ditch, pumped water and sand, and the like. And according to the water level observation condition, the operation of the dewatering well is dynamically regulated and controlled by combining the foundation pit excavation condition, and the safety and controllability of the cofferdam and the bottom sealing structure are ensured.
The above are all preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (7)
1. A well point dewatering method for a steel cofferdam in water is characterized by comprising the following steps: the method comprises the following steps:
s1: early preparation: the pile casing (6), the well pipe units (2), the positioning device and the drilling machine are transported to a construction site, and a temporary construction platform is built on the periphery of the cofferdam;
s2: positioning and mounting: marking is done at the on-site well logging position, and a drilling machine is arranged on a temporary construction platform;
s3: and (3) casing construction: inserting the casing (6) to the well position;
s4: drilling to form a hole: drilling a hole at the well site;
s5: construction of well pipes: installing a positioning device on a temporary construction platform, wherein the positioning device is positioned right above a drill hole, vertically inserting a well pipe unit (2) into the positioning device, inserting the lower end of the well pipe unit (2) into the drill hole, and then temporarily fixing the well pipe unit (2) by the positioning device;
s6: well pipe welding: vertically inserting a well pipe unit (2) into the positioning device from top to bottom, aligning and communicating ports of the adjacent well pipe units (2), then welding and stabilizing the interface of the adjacent well pipe units (2), then releasing the welded and stabilized well pipe by the positioning device, inserting the lower end of the uppermost well pipe unit (2) into the drill hole, and then temporarily fixing the well pipe by the positioning device;
s7: repeating the operation until the lower end of the well pipe is inserted to the designed depth;
s8: filling and cementing wells: filling the filter material into a gap between the inner wall of the casing (6) and the outer wall of the well pipe;
s9: dewatering construction;
in the S5, the positioning device comprises a rack (1) and two conveying rollers (4) which are horizontally and rotatably connected in the rack (1) and are parallel to each other, a plurality of baffles (41) are arranged on the two conveying rollers (4), the plurality of baffles (41) are circumferentially distributed on the outer peripheral surfaces of the conveying rollers (4), a driving piece for driving the two conveying rollers (4) to synchronously and reversely rotate is arranged on the rack (1), a plurality of positioning strips (21) are arranged on two sides of the well pipe unit (2), and the plurality of positioning strips (21) on the same side are distributed along the length direction of the well pipe unit (2); when the well pipe is positioned, the well pipe unit (2) is vertically inserted between two conveying rollers (4), baffle plates (41) of the two conveying rollers (4) are respectively abutted against the lower end faces of positioning strips (21) on two sides of the well pipe unit (2), and the well pipe unit (2) is supported; when the well pipe is lowered, the driving piece drives the conveying roller (4) to rotate and drives the baffle (41) to swing downwards, and the well pipe unit (2) moves downwards and is inserted into the drill hole.
2. The method for dewatering the well points of the steel cofferdam in the water according to claim 1, characterized in that: the driving piece comprises a motor (3) and two gears (5), the two gears (5) are respectively fixedly sleeved on the two conveying rollers (4), and the two gears (5) are in meshing transmission; an output shaft of the motor (3) is coaxially connected with one of the conveying rollers (4).
3. The method for dewatering the well points of the steel cofferdam in the water according to claim 1, characterized in that: the well pipe unit is characterized in that the rack (1) is provided with a positioning ring (11), the positioning ring (11) is positioned above the two conveying rollers (4), and when the well pipe unit (2) is inserted into the positioning ring (11), the well pipe unit (2) is positioned between the two conveying rollers (4).
4. The method for dewatering the well point of the steel cofferdam in the water according to claim 1, characterized in that: the clamping groove (42) is formed in the supporting surface of the baffle (41), the clamping groove (42) extends along the radial direction of the conveying roller (4), the clamping groove (42) is arranged at the position, away from the opening of one end of the conveying roller (4), of the clamping groove (42), and when the baffle (41) supports the corresponding positioning strip (21), the positioning strip (21) is clamped in the clamping groove (42).
5. The method for dewatering the well points of the steel cofferdam in water according to claim 3, characterized in that: two vertical grooves (111) which are opposite to each other are formed in the inner side wall of the positioning ring (11), the vertical grooves (111) are vertically extended, two ends of each vertical groove are open, and when the well pipe unit (2) penetrates through the positioning ring (11), the positioning strips (21) on two sides of the well pipe unit (2) are respectively connected to the vertical grooves (111) on two sides of the positioning ring (11) in a sliding mode.
6. The method for dewatering the well points of the steel cofferdam in water according to claim 3, characterized in that: frame (1) is provided with welded platform (12), welded platform (12) are located between position circle (11) and conveying roller (4).
7. The method for dewatering the well points of the steel cofferdam in water according to claim 6, characterized in that: and a through hole (121) for the well pipe unit (2) to pass through is vertically penetrated in the middle of the welding platform (12).
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110042852A (en) * | 2019-03-27 | 2019-07-23 | 中和华丰建设有限责任公司 | A kind of construction method of deep-well point dewatering |
| WO2021196657A1 (en) * | 2020-04-03 | 2021-10-07 | 山东大学 | Novel fabricated anchorage structure serving as both dewatering well and support, and construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110042852A (en) * | 2019-03-27 | 2019-07-23 | 中和华丰建设有限责任公司 | A kind of construction method of deep-well point dewatering |
| WO2021196657A1 (en) * | 2020-04-03 | 2021-10-07 | 山东大学 | Novel fabricated anchorage structure serving as both dewatering well and support, and construction method |
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