CN113293783B - Construction method for hole leading of underwater steel cofferdam - Google Patents
Construction method for hole leading of underwater steel cofferdam Download PDFInfo
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- CN113293783B CN113293783B CN202110740451.9A CN202110740451A CN113293783B CN 113293783 B CN113293783 B CN 113293783B CN 202110740451 A CN202110740451 A CN 202110740451A CN 113293783 B CN113293783 B CN 113293783B
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- General Life Sciences & Earth Sciences (AREA)
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- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
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Abstract
The invention discloses a construction method of a guide hole of a steel cofferdam in water, which comprises the following steps: 1) building a construction steel platform (1) and a trestle (2) beside the position of the lead hole, and manufacturing a positioning box plate (3); 2) the box plate (3) is fixedly positioned; 3) leading holes; 4) forming a slot pattern by multiple hole leading; 5) pumping water in the steel sleeve (4) by a water pump; 6) and after water is pumped out, backfilling gravel into the steel sleeve (4), and pulling out the steel sleeve (4) after backfilling. The invention utilizes the positioning of the positioning box plate and adopts the matching use of related drilling machines, thereby not only improving the positioning accuracy of the steel sleeve, but also improving the efficiency of drilling a slotted hole in a rock layer, and having convenient operation and high construction safety.
Description
Technical Field
The invention relates to the technical field of hole leading construction of an underwater steel cofferdam, in particular to a hole leading construction method of an underwater steel cofferdam.
Background
In the traditional underwater steel cofferdam hole leading construction technology, channel steel is usually welded on a steel platform to serve as a guide frame, then a steel sleeve is placed in the guide frame, and a percussion drill is used for leading holes. In the construction process, the guide frame needs to be continuously disassembled and modified, time and labor are wasted, the engineering quantities of aerial hoisting and water welding are increased, and the operation safety is poor; with the driving of the steel sleeve, the lengthening of the steel sleeve also relates to overwater welding, so that the potential safety hazard of construction is further increased; in addition, a mud pit is required to be arranged in the process of punching and drilling the guide hole in water, so that the environment is adversely affected, and meanwhile, the punching and drilling construction efficiency is low and the construction period is long; no matter be the in-process that strikes and bore the hole or shake and sink the steel casing, the leading truck all can cause the disturbance, influences the construction precision, leads to the lead hole quality poor, especially to the tight, construction degree of difficulty of a project, the construction of leading hole of steel cofferdam in water that the required precision is high, these problems seem more serious to protruding.
Disclosure of Invention
The invention aims to provide a construction method for the hole leading of the underwater steel cofferdam, which has the advantages of good safety, high hole leading precision and good hole forming quality.
The technical scheme of the invention is as follows:
a construction method for a guide hole of an underwater steel cofferdam comprises the following steps:
1) building a construction steel platform and a trestle beside the position of the lead hole, and manufacturing a positioning box plate;
2) a positioning box plate is fixedly arranged between the construction steel platform and the trestle, and the positioning box plate is placed right above the position of the lead hole; the positioning box plate comprises a panel and a bottom plate which are mutually buckled, four stiffening rings are arranged in the bottom plate in parallel, the edge distance size of every two adjacent stiffening rings is the same as the diameter size of the stiffening rings, and stiffening ribs are also arranged on the bottom plate and are I-shaped steel;
3) the steel sleeve is positioned and clamped by the full-slewing drilling machine and downwards penetrates through the corresponding position of the positioning box plate, the steel sleeve is slowly pressed into the sandstone layer, and along with the pressing of the steel sleeve, when the upper end surface of the steel sleeve is close to the upper end surface of the positioning box plate, a steel sleeve is additionally arranged at the upper end of the steel sleeve, and the upper end position of the additionally arranged steel sleeve can be clamped and fixed by the full-slewing drilling machine so as to ensure continuous pressing;
4) in the pressing-in process, a rotary drilling rig is adopted to take earth in the steel sleeve at the non-lithosphere position, the steel sleeve continues to drill after taking earth, and the steel sleeve is repeatedly and continuously driven in the same way; when the rock layer is drilled, a rotary drilling rig is used for taking soil in advance, the rock layer is drilled loose, the drill bit of the rotary drilling rig is placed into the drilled hole after the soil is taken, the operation is repeated until the hole bottom is drilled, and finally the steel sleeve is pressed down along the outer edge of the drill bit until the hole bottom is reached;
5) pumping water in the steel sleeve by a water pump;
6) after water is pumped out, backfilling gravel into the steel sleeve, and pulling out the steel sleeve after backfilling;
in the step 4), the full-slewing drilling machine and the rotary excavating machine are matched for construction, when the steel casing pipe cannot drill or inclines, the rotary excavating machine is used for breaking rock layers one by one, broken stones are taken out, then the drill bit of the rotary excavating machine is placed into the drill bit of the rotary excavating machine for continuously drilling until the position of the hole bottom with the required depth is drilled, a gap between the drill bit and a soil body is used for guiding, the steel casing pipe is pressed down along the gap position, the connection between the drilling of the drill bit of the rotary excavating machine and the pressing of the steel casing pipe is pressed down once in an interval of not more than 1 meter until the hole bottom is reached; and then, translating the positioning box plate, moving the diameter distance of a stiffening ring and fixing, repeating the construction contents from the step 4) to the step 6), finally, horizontally moving the positioning box plate back by 1/2 diameter distance of the stiffening ring and fixing, repeating the construction contents from the step 4) to the step 6), and drilling a slotted hole pattern on the rock layer and backfilling for protection.
By adopting the method, the structure of the positioning box plate is simplified while the stress strength is ensured, the positioning box plate is convenient to use, the positioning box plate is welded and fixed with the trestle and the steel platform after being moved in place, the counter-force fork is arranged for matching use, equipment is subjected to back pressure by utilizing the counter weight, the equipment is prevented from being damaged due to slippage in the construction process of the full-circle slewing drilling machine, and safety accidents can be prevented; the bolt connection lengthening of the steel sleeve can be directly completed above the positioning box plate or at the top of the full-slewing drilling machine, manual hole descending and overwater welding operation are not needed, safety risks are reduced, the verticality of the steel sleeve can be guaranteed, and the hole guiding quality is safe and reliable.
In order to ensure construction safety, it is preferable that a reaction fork is provided at one side of the full slewing drilling machine, and a weight is fixedly provided to the reaction fork.
In order to facilitate connection and improve the stability of lengthened connection, preferably, in the step 3), a stepped hole is formed in the inner pipe wall of one end of the steel sleeve, a section of extension section is wound on the end face of the other end of the steel sleeve, the extension section and the pipe wall of the corresponding end of the steel sleeve form a stepped structure, a plurality of first connection holes are wound on the hole wall of the stepped hole, and second connection holes are formed in the positions, corresponding to the first connection holes, on the outer side wall of the extension section; when the two steel sleeves are connected in the vertical direction, the extension section of the lower steel sleeve extends into the step hole of the upper steel sleeve, the first connecting hole is aligned with the second connecting hole, and the first connecting hole and the second connecting hole are sequentially penetrated through by the fixing bolt from outside to inside and are tightly riveted to realize fixed connection.
In order to avoid the blocking of the guide hole and prevent the interference of later construction, and meanwhile, the marking is convenient, preferably, in the step 6), after water is pumped out, when clay is backfilled, a drill bit of a rotary excavating machine is used for compacting after each backfilling time is 1m high, gravel is backfilled to 500mm above the river bed surface, a steel sleeve is pulled out, a measuring rope is adopted for controlling the backfilling elevation, and the measurement is controlled for many times in the process.
Has the advantages that: the invention utilizes the positioning of the positioning box plate and adopts the matching use of related drilling machines, thereby not only improving the positioning accuracy of the steel sleeve, but also improving the efficiency of drilling a slotted hole in a rock layer, and having convenient operation and high construction safety.
Drawings
FIG. 1 is a schematic view of the construction state of the present invention.
Fig. 2 is a schematic structural view of the positioning box board.
Fig. 3 is a schematic view of the structure of a steel casing.
Fig. 4 is a construction effect diagram of the pilot hole of the present invention.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1 to 4, the method of use of the present invention is as follows:
1) building a construction steel platform 1 and a trestle 2 beside the position of the lead hole; manufacturing a positioning box plate 3;
2) welding and fixing a positioning box plate 3 between the construction steel platform 1 and the trestle 2, wherein the positioning box plate 3 is placed right above the position of the lead hole; the positioning box plate 3 comprises a panel 31 and a bottom plate 32 which are buckled with each other, four stiffening rings 321 are arranged in the bottom plate 32 in parallel, the edge distance of two adjacent stiffening rings 321 is the same as the diameter of the stiffening ring 321, a stiffening rib 322 is also arranged on the bottom plate 32, and the stiffening rib 322 is I-shaped steel;
3) the steel sleeve 4 is positioned and clamped by the full-slewing drilling machine and penetrates through the corresponding position of the positioning box plate 3 downwards, the steel sleeve 4 is slowly pressed into the sandstone layer, along with the pressing of the steel sleeve 4, when the upper end surface of the steel sleeve 4 is close to the upper end surface of the positioning box plate 3, the upper end of the steel sleeve 4 is additionally provided with the steel sleeve 4, and the upper end position of the additionally provided steel sleeve 4 can be clamped and fixed by the full-slewing drilling machine so as to ensure continuous pressing; it should be noted that, when two steel sleeves 4 are connected in the vertical direction, the extension section 42 of the lower steel sleeve 4 extends into the step hole 41 of the upper steel sleeve 4, and the first connection hole 411 is aligned with the second connection hole 421, and then the first connection hole 411 and the second connection hole 421 are sequentially penetrated through by a fixing bolt from outside to inside and are riveted tightly to realize fixed connection;
4) in the pressing-in process, a rotary drilling rig is adopted to take soil in the steel sleeve 4 at the non-lithosphere position, the steel sleeve 4 continues to drill after taking the soil, and the steel sleeve 4 is repeatedly and continuously driven in the same way; when the rock layer is drilled, a rotary drilling rig is used for taking soil in advance, the rock layer is drilled loose, the drill bit of the rotary drilling rig is placed into the drilled hole after the soil is taken, the operation is repeated until the hole bottom is drilled, and finally the steel sleeve 4 is pressed down along the outer edge of the drill bit until the hole bottom is reached;
5) pumping water in the steel sleeve 4 by a water pump;
6) and after the water is pumped out, backfilling gravel into the steel sleeve 4, and pulling out the steel sleeve 4 after backfilling.
In the steps, the drill bit of the rotary excavating machine is connected with the steel sleeve by downward pressing once within the interval of not more than 1 meter until the drill bit reaches the bottom of the hole; after drilling a hole, grinding the welding position, translating the positioning box plate 3, moving a diameter distance of a stiffening ring 321, welding and fixing, repeating the construction contents from the step 4) to the step 6), horizontally moving the positioning box plate 3 back by 1/2 diameter distance of the stiffening ring 321, welding and fixing, repeating the construction contents from the step 4) to the step 6), drilling a slotted hole pattern on the rock layer, and backfilling and protecting (the slotted hole pattern is shown in figure 4, wherein the solid line is the slotted hole pattern after the hole is led at the position of the stiffening ring 321, and the dotted line is the position removed during the last hole led).
And 6), after water is pumped out, compacting the gravel by using a rotary excavating machine drill bit after backfilling the gravel until the height of the gravel is 1m, pulling out the steel sleeve 4 when the gravel is backfilled to 500mm above the surface of the river bed, and controlling the backfilling elevation by using a measuring rope for multiple times in the process.
A counter-force fork 5 is arranged on one side of the full-slewing drilling machine, and a counterweight is fixedly arranged on the counter-force fork 5, so that the full-slewing drilling machine can be balanced by the counterweight, and the overturning caused by the inclination of stress can be avoided.
The undescribed parts of the present invention are consistent with the prior art, and are not described herein.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures made by using the contents of the present specification and the drawings can be directly or indirectly applied to other related technical fields, and are within the scope of the present invention.
Claims (4)
1. A construction method for a guide hole of an underwater steel cofferdam is characterized by comprising the following steps:
1) building a construction steel platform (1) and a trestle (2) beside the position of the lead hole, and manufacturing a positioning box plate (3);
2) a positioning box plate (3) is fixedly arranged between the construction steel platform (1) and the trestle (2), and the positioning box plate (3) is placed right above the position of the lead hole; the positioning box plate (3) comprises a panel (31) and a bottom plate (32) which are buckled with each other, four stiffening rings (321) are arranged in the bottom plate (32) in parallel, the edge distance size of every two adjacent stiffening rings (321) is the same as the diameter size of the stiffening rings (321), stiffening ribs (322) are further arranged on the bottom plate (32), and the stiffening ribs (322) are I-shaped steel;
3) the steel sleeve (4) is clamped by the full-slewing drilling machine in a positioning mode and penetrates through the corresponding position of the positioning box plate (3) downwards, the steel sleeve (4) is slowly pressed into the sandstone layer, along with the pressing of the steel sleeve (4), when the upper end face of the steel sleeve (4) is close to the upper end face of the positioning box plate (3), the steel sleeve (4) is additionally arranged at the upper end of the steel sleeve (4), and the upper end position of the additionally arranged steel sleeve (4) can be clamped and fixed by the full-slewing drilling machine to guarantee continuous pressing;
4) in the pressing-in process, a rotary drilling rig is adopted to take soil in the steel sleeve (4) at the non-lithosphere position, the steel sleeve (4) continues to drill after taking the soil, and the soil is repeatedly and continuously driven into the steel sleeve (4); when the rock layer is drilled, a rotary drilling rig is used for taking soil in advance, the rock layer is drilled loose, the drill bit of the rotary drilling rig is placed into the drilled hole after the soil is taken, the operation is repeated until the hole bottom is drilled, and finally the steel sleeve (4) is pressed down along the outer edge of the drill bit until the hole bottom is reached;
5) pumping water in the steel sleeve (4) by a water pump;
6) after water is pumped out, backfilling gravel into the steel sleeve (4), and pulling out the steel sleeve (4) after backfilling;
in the step 4), the full-slewing drilling machine and the rotary excavating machine are matched for construction, when the steel sleeve (4) cannot drill or inclines, the rotary excavating machine is used for breaking rock layers one by one, broken stones are taken out, then the drill bit of the rotary excavating machine is placed into the drill bit of the rotary excavating machine for continuously drilling until the position of the hole bottom with the required depth is drilled, the gap between the drill bit and the soil body is used for guiding, the steel sleeve (4) is pressed down along the gap position, the connection between the drilling of the drill bit of the rotary excavating machine and the pressing of the steel sleeve is pressed down once in an interval of not more than 1 meter until the hole bottom is reached; and then, translating the positioning boxboard (3), moving the diameter distance of a stiffening ring (321) and fixing, repeating the construction contents from the step 4) to the step 6), finally, horizontally moving the positioning boxboard (3) back by 1/2 diameter distance of the stiffening ring (321) and fixing, repeating the construction contents from the step 4) to the step 6), and drilling a slotted hole pattern on the rock layer and backfilling for protection.
2. The construction method of the pilot hole of the underwater steel cofferdam of claim 1, wherein: a counter-force fork (5) is arranged on one side of the full slewing drilling machine, and a counterweight is fixedly arranged on the counter-force fork (5).
3. The construction method of the pilot hole of the underwater steel cofferdam of claim 1, wherein: in the step 3), a step hole (41) is arranged on the inner pipe wall at one end of the steel sleeve (4), a section of extension section (42) is wound on the end face at the other end, the extension section (42) and the pipe wall at the corresponding end of the steel sleeve (4) form a step structure, a plurality of first connecting holes (411) are wound on the hole wall of the stepped hole (41), the outer side wall of the extension section (42) is provided with second connecting holes (421) corresponding to the first connecting holes (411), when two steel sleeves (4) are connected in the vertical direction, the extension section (42) of the lower end steel sleeve (4) extends into the step hole (41) of the upper end steel sleeve (4), and the first connecting hole (411) is aligned with the second connecting hole (421), and then the first connecting hole (411) and the second connecting hole (421) are sequentially penetrated through by a fixing bolt from outside to inside and are riveted tightly to realize fixed connection.
4. The construction method of the pilot hole of the underwater steel cofferdam of claim 1, wherein: and in the step 6), after water is pumped out, when gravel is backfilled, compacting the gravel by using a rotary excavating machine drill bit after the gravel is backfilled to be 1m high, backfilling the gravel to be 500mm above the surface of the river bed, pulling out the steel sleeve (4), and controlling the backfilling elevation by using a measuring rope for a plurality of times in the process.
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| CN202110740451.9A CN113293783B (en) | 2021-06-30 | 2021-06-30 | Construction method for hole leading of underwater steel cofferdam |
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| CN202110740451.9A CN113293783B (en) | 2021-06-30 | 2021-06-30 | Construction method for hole leading of underwater steel cofferdam |
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| CN113293783B true CN113293783B (en) | 2022-05-20 |
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| CN115030202A (en) * | 2022-07-20 | 2022-09-09 | 中建三局集团有限公司 | Soft-consolidation construction method for cofferdam under thin-covering-layer hard riverbed condition |
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2021
- 2021-06-30 CN CN202110740451.9A patent/CN113293783B/en active Active
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| TWM416645U (en) * | 2011-05-03 | 2011-11-21 | Boomjirlin Machinery Co Ltd | All-casing pipe with connector having double rows of bolt |
| CN108193680A (en) * | 2017-12-29 | 2018-06-22 | 中交二公局第工程有限公司 | Construction method for constructing large-diameter steel casing and three-frame type guide frame |
| CN108442395A (en) * | 2018-05-14 | 2018-08-24 | 中铁八局集团第二工程有限公司 | Latch steel pipe pile cofferdam construction method |
| CN110158624A (en) * | 2019-05-29 | 2019-08-23 | 中铁大桥局第七工程有限公司 | A kind of steel sheet pile cofferdam construction method |
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Effective date of registration: 20221202 Address after: 430000 No. 552 Guan Shan Road, Hubei, Wuhan Patentee after: CHINA CONSTRUCTION THIRD CONSTRUCTION ENGINEERING Co.,Ltd. Patentee after: CHINA CONSTRUCTION THIRD ENGINEERING BUREAU GREEN INDUSTRY INVESTMENT Co.,Ltd. Address before: 430074 No. 552 Guan Shan Road, Hubei, Wuhan Patentee before: CHINA CONSTRUCTION THIRD CONSTRUCTION ENGINEERING Co.,Ltd. |
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