CN111608173B - Construction method and device for bare rock drilled pile on deep water steep slope - Google Patents
Construction method and device for bare rock drilled pile on deep water steep slope Download PDFInfo
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- CN111608173B CN111608173B CN202010498265.4A CN202010498265A CN111608173B CN 111608173 B CN111608173 B CN 111608173B CN 202010498265 A CN202010498265 A CN 202010498265A CN 111608173 B CN111608173 B CN 111608173B
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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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/08—Sinking workpieces into water or soil inasmuch as not provided for elsewhere
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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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
- E02D27/14—Pile framings, i.e. piles assembled to form the substructure
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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
- E02D5/66—Mould-pipes or other moulds
- E02D5/68—Mould-pipes or other moulds for making bulkheads or elements thereof
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/23—Dune restoration or creation; Cliff stabilisation
Abstract
The invention provides a construction method and a device for a bare rock drilled pile on a deep water steep slope, and belongs to the technical field of underwater foundation construction. According to the invention, the solid tube cofferdam is placed into the cofferdam embedded groove and then is clamped on the bare rock after the cofferdam embedded groove is formed in the bare rock of the abrupt slope, so that the solid tube cofferdam can be prevented from sliding or tipping, the solid tube cofferdam and the pile casing can be conveniently and quickly positioned, the subsequent construction efficiency is improved, the shape of the lower part of the solid tube cofferdam is adjusted according to the form of the bare rock, the lower part of the solid tube cofferdam can be further ensured to be matched with the bare rock more tightly due to local conditions, the poured underwater concrete is prevented from being excessively leaked, and the material saving is facilitated; and then, by pouring underwater concrete, firmly and integrally consolidating the fixed tube cofferdam, the pile casing and the bare rock, the pile casing is firmly fixed on the bare rock, so that the subsequent drilling pile driving is possible, the construction difficulty is reduced, and the safe and quick construction of the bare rock foundation of the deep water steep slope is realized.
Description
Technical Field
The invention belongs to the technical field of underwater foundation construction, and particularly relates to a construction method and device for a bare rock drilled pile on a deep water steep slope.
Background
In engineering, a bridge foundation with the water depth of more than 5-6 m is generally called as a deepwater foundation. In the section with deep water level across the river reach, steep rock slope appears at the river bottom and less soil is covered, and the high pier bearing platform is difficult to build. The main reason is that before the high pier bearing platform is built, drilling piles (also called as drilling cast-in-place piles) need to be arranged at the bottom of a river, then the high pier bearing platform is poured on the drilling piles, and if a protection cylinder is directly inserted into an underwater rock steep slope section, the protection cylinder is difficult to support and stabilize due to the influence of the steep slope, and the situations of relative sliding and even overturning occur, so the drilling operation difficulty is high; if adopt traditional pouring jacket cofferdam construction, because of rock mountain region height and low and rise under water, the cofferdam can't be fixed in the bare rock abrupt slope, also slides easily and can produce great space, easily leads to the back cover concrete to spill, the condition that the quantity is many and extravagant appears, because the space is too big so that be difficult to the back cover even, simultaneously because the concrete dead weight is great, leads to sliding of cofferdam more easily.
Disclosure of Invention
The invention aims to provide a construction method and a device for a deep-water steep slope bare rock bored pile, and aims to solve the technical problem that foundation construction is difficult in a deep-water steep slope bare rock environment in the prior art.
In order to realize the purpose, the invention adopts the technical scheme that: the construction method of the bare rock drilled pile on the deep water steep slope comprises the following steps:
A. surveying and mapping the form of the bare rock of the part to be constructed, and arranging a vertical cofferdam embedded groove at least at the upper part of the bare rock according to the cross section shape of the solid-tube cofferdam;
B. prefabricating a pile casing, a solid casing cofferdam and a hanging box cofferdam, so that the shape of the bottom of the solid casing cofferdam is matched with the shape of the lower part of the bare rock and the shape of a cofferdam embedded groove;
C. assembling and fixing the pile casings in the solid casing cofferdam, and lowering the pile casings and the solid casing cofferdam to the bare rock so that the corresponding part at the lower part of the solid casing cofferdam enters the cofferdam embedded groove;
D. pouring underwater concrete between the solid tube cofferdam and the pile casing and in the cofferdam embedded groove, and consolidating the solid tube cofferdam, the pile casing and the bare rock into a whole;
E. and (4) erecting a fixed platform at the upper part of the pile casing and driving a drilled pile.
In an embodiment of the present invention, in the step a, the step of forming the vertical cofferdam embedding groove includes:
the position of seting up the cofferdam embedding groove is fixed a position, utilizes floating platform and percussion drill vertical to beat on the bare rock and establishes the cofferdam embedding groove, and the cofferdam embedding groove is overlooked to being the U type, separates the part bare rock on the abrupt slope and rock mass on every side, forms the lug that can be held in solid section of thick bamboo cofferdam to carry on spacingly to solid section of thick bamboo cofferdam, prevent solid section of thick bamboo cofferdam from sliding downwards along the abrupt slope.
In one embodiment of the invention, the solid tube cofferdam is of an inner-outer double-wall structure, the inner wall and the outer wall are divided into a plurality of closed compartments arranged around the axis of the solid tube cofferdam by vertical clapboards, the pile casing is provided with a plurality of sections which can be connected end to end, and the step C comprises the following steps:
the method comprises the steps of firstly connecting a solid tube cofferdam with a section of pile casing on a floating platform, then controlling the solid tube cofferdam to sink and adjust balance in a mode of injecting water and discharging water into a closed compartment, and simultaneously connecting the rest sections of pile casings with a first section of pile casing until the corresponding part of the lower part of the solid tube cofferdam enters a cofferdam embedded groove.
In an embodiment of the present invention, the apparatus for constructing a bare rock bored pile in a deep water steep slope further comprises the steps of:
F. and (3) removing the fixed platform, installing a hanging box cofferdam on the upper part of the pile casing, draining water in the hanging box cofferdam, treating the top of the bored pile, and pouring a high pile cap and a vertical pier in the hanging box cofferdam.
In one embodiment of the present invention, in step F, the step of installing a hanging box cofferdam on the upper portion of the casing includes:
and (3) presetting a positive bracket on the upper part of the protective sleeve, lowering the hanging box cofferdam along the protective sleeve until the bottom of the hanging box cofferdam is supported on the positive bracket, mounting a reverse bracket on the protective sleeve to be matched with the positive bracket to fix the bottom of the hanging box cofferdam, and pouring underwater concrete between the bottom of the hanging box cofferdam and the protective sleeve for bottom sealing.
In order to achieve the purpose, the invention adopts the following technical scheme: the construction device comprises a pile casing and a solid casing cofferdam, wherein the pile casing is vertically arranged underwater, and the lower end of the pile casing extends to the underwater bare rock to assist in driving the drilled pile; the solid barrel cofferdam is arranged at the lower end of the pile casing and fixedly connected with the pile casing, one side of the lower end is embedded in a cofferdam embedding groove which is preset on underwater bare rock, and the other side of the lower end is attached to the surface of the underwater bare rock.
In one embodiment of the invention, a plurality of pile casings are arranged in the solid casing cofferdam, and the solid casing cofferdam and the pile casings are fixedly connected through connecting columns; and a space for filling concrete is arranged between the solid tube cofferdam and the pile casing.
In one embodiment of the invention, each side wall of the solid tube cofferdam comprises a supporting framework, an outer wall plate, an inner wall plate, a blade foot and a plurality of partition plates, wherein the outer wall plate is arranged outside the supporting framework; the inner wall plate is arranged at the inner side of the supporting framework; the cutting edge is arranged at the lower part of the supporting framework, is respectively connected with the outer wall plate and the inner wall plate in a sealing way and is used for supporting on bare rock; the partition boards are vertically arranged between the outer wall board and the inner wall board and are used for dividing the space between the outer wall board and the inner wall board into a plurality of closed partitions.
In an embodiment of the invention, the construction device for the bare rock bored pile in the deep water steep slope further comprises a suspension box cofferdam, and the suspension box cofferdam is arranged at the upper end of the pile casing and is fixedly connected with the pile casing.
In one embodiment of the invention, the hanging box cofferdam comprises double layers of side walls and a bottom plate, the pile casing is provided with a positive bracket positioned below the bottom plate of the hanging box cofferdam and a negative bracket positioned above the bottom plate of the hanging box cofferdam, and the positive bracket are matched to limit and fix the hanging box cofferdam.
The construction method of the bare rock drilled pile on the deep water steep slope has the beneficial effects that: compared with the prior art, the invention can provide an effective impetus by utilizing the bare rock by arranging the cofferdam embedded groove on the bare rock of the steep slope and then placing the solid cofferdam into the cofferdam embedded groove and then clamping the solid cofferdam on the bare rock, thereby avoiding the sliding or tipping of the solid cofferdam, ensuring the stability of the solid cofferdam, facilitating the rapid positioning of the solid cofferdam and the pile casing, reducing the limitation on the subsequent construction strength, leading the subsequent construction to be carried out in a high-strength and rapid way, improving the subsequent construction efficiency, embedding the bare rock in part of the solid cofferdam, being beneficial to reducing the clearance range between the lower part of the solid cofferdam and the bare rock, simultaneously adjusting the shape of the lower part of the solid cofferdam according to the form of the bare rock, and further ensuring the lower part of the solid cofferdam to be matched with the bare rock more tightly according to local conditions, avoiding the excessive poured underwater concrete, is beneficial to saving materials; and then, pouring underwater concrete, filling gaps between the solid tube cofferdam and the pile casing and the cofferdam embedded groove, firmly and integrally consolidating the solid tube cofferdam, the pile casing and the bare rock, and firmly fixing the pile casing on the bare rock, so that the subsequent drilling pile driving is possible, the construction difficulty is favorably reduced, and the safe and rapid construction of the bare rock foundation of the deep water steep slope is realized.
The construction device for the bare rock drilled pile on the deep water steep slope has the beneficial effects that: compared with the prior art, the lower end of the solid tube cofferdam can be embedded into a cofferdam embedded groove preset on underwater bare rock and attached to the surface of the underwater bare rock, the protective tube is temporarily fixed on the bare rock, the protective tube is firmly fixed on the bare rock by combining the subsequent underwater concrete pouring and the bare rock, so that the subsequent drilling pile driving is possible, the construction difficulty is reduced, and the safe and quick construction of the deep water steep slope bare rock foundation is realized.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic vertical sectional view of a construction device for a bare rock bored pile in a deep water steep slope according to an embodiment of the present invention;
FIG. 2 is a schematic view of the view direction A-A in FIG. 1;
FIG. 3 is a schematic view of the view direction B-B in FIG. 1;
FIG. 4 is a schematic cross-sectional view taken along line C-C of FIG. 2;
fig. 5 is a schematic structural diagram of a connecting column of the device for constructing a bare rock bored pile in a deep water steep slope according to the embodiment of the present invention.
Wherein, in the figures, the respective reference numerals:
10. protecting the cylinder; 11. correcting a corbel; 12. a counter bracket; 13. connecting columns;
20. fixing a barrel cofferdam; 21. a support framework; 22. an outer wall panel;
23. an inner wall panel; 24. a blade foot; 25. a partition panel;
30. hanging a box cofferdam; 40. a fixed platform; 50. underwater concrete;
60. bare rock wire; 61. a cofferdam embedded groove; 70. and (6) drilling a pile.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The construction method and the device for the bare rock drilled pile in the deep water steep slope provided by the invention are explained.
The invention provides a construction method of a deep water steep slope bare rock drilled pile, which comprises the following steps:
A. surveying and mapping the form of the bare rock of the part to be constructed, and arranging a vertical cofferdam embedding groove 61 at least at the upper part of the bare rock according to the cross section shape of the solid-tube cofferdam 10;
B. prefabricating a pile casing 10, a solid casing cofferdam 20 and a hanging box cofferdam 30, so that the shape of the bottom of the solid casing cofferdam 20 is matched with the shape of the lower part of the bare rock and the shape of a cofferdam embedded groove 61;
C. assembling and fixing the pile casing 10 in the solid casing cofferdam 20, and lowering the pile casing 10 and the solid casing cofferdam 20 to the bare rock, so that the corresponding part at the lower part of the solid casing cofferdam 20 enters the cofferdam embedded groove 61;
D. pouring underwater concrete between the solid tube cofferdam 20 and the pile casing 10 and in the cofferdam embedded groove 61, and consolidating the solid tube cofferdam 20, the pile casing 10 and the bare rock into a whole;
E. and (3) building a fixed platform 40 at the upper part of the pile casing 10 and driving a bored pile.
Compared with the prior art, the construction method of the open rock bored pile of the deep water steep slope has the advantages that the fixed tube cofferdam 20 is placed into the cofferdam embedded groove 61 and then is clamped on the open rock after the cofferdam embedded groove 61 is formed on the open rock of the steep slope, an effective acting point can be provided by the open rock, the fixed tube cofferdam 20 is prevented from sliding or tipping, the stability of the fixed tube cofferdam 20 is ensured, the fixed tube cofferdam 20 and the pile casing 10 are convenient to rapidly position, the limitation on the subsequent construction strength is reduced, the subsequent construction can be carried out in a high-strength manner and a rapid manner, the subsequent construction efficiency is improved, the gap range between the lower part of the fixed tube cofferdam 20 and the open rock is favorably reduced due to the fact that the lower part of the fixed tube cofferdam 20 is embedded into the open rock, the shape of the lower part of the fixed tube cofferdam 20 is adjusted according to the form of the open rock, the lower part of the fixed tube cofferdam 20 can be more tightly matched with the open rock due to local conditions, the poured underwater concrete is prevented from being excessively leaked, and the material is saved; and then, pouring underwater concrete, filling the gap between the solid tube cofferdam 20 and the pile casing 10 and the cofferdam embedding groove 61, firmly and integrally consolidating the solid tube cofferdam 20, the pile casing 10 and the bare rock, and firmly fixing the pile casing 10 on the bare rock, so that the subsequent drilling pile driving is possible, the construction difficulty is favorably reduced, and the safe and quick construction of the deep water steep slope bare rock foundation is realized.
As a specific embodiment of the device for constructing a bare rock bored pile in a deep water steep slope provided by the present invention, in the step a, the step of providing the vertical cofferdam embedded groove 61 includes:
the position of seting up cofferdam embedded groove 61 is fixed a position, utilizes floating platform and strike to bore on the bare rock vertically to beat and establish cofferdam embedded groove 61, and cofferdam embedded groove 61 looks from top to be the U type, separates the part bare rock on the abrupt slope with rock mass on every side, forms the lug that can be held in solid section of thick bamboo cofferdam 20 to carry on spacingly to solid section of thick bamboo cofferdam 20, prevent solid section of thick bamboo cofferdam 20 and slide downwards along the abrupt slope.
As a specific implementation manner of the construction device for the bare rock drilled pile in the deep water steep slope, provided by the invention, the solid barrel cofferdam 20 is of an inner and outer double-wall structure, the inner and outer walls are divided into a plurality of closed compartments arranged around the axis of the solid barrel cofferdam 20 by vertical partition plates, the pile casing 10 is provided with a plurality of sections which can be connected end to end, and the step C comprises the following steps:
firstly, connecting a solid tube cofferdam 20 with a section of pile casing 10 on a floating platform, controlling the solid tube cofferdam 20 to sink and adjust balance by injecting water and discharging water into a closed compartment, and simultaneously connecting the rest sections of pile casings 10 with a first section of pile casing 10 until the corresponding part of the lower part of the solid tube cofferdam 20 enters a cofferdam embedding groove 61.
As a specific embodiment of the device for constructing the bare rock drilled pile on the deep water steep slope provided by the invention, in the step a, the step of pouring the underwater concrete comprises the following steps:
pouring underwater concrete into the solid tube cofferdam 20, pressing the solid tube cofferdam 20, pouring the underwater concrete into the cofferdam embedded groove 61 (namely, two sides of the solid tube cofferdam 20), sealing the solid tube cofferdam 20 in the cofferdam embedded groove 61, and finally pouring the underwater concrete between the solid tube cofferdam 20 and the pile casing 10.
Before pouring the underwater concrete between the solid tube cofferdam 20 and the pile casing 10, a diver can be sent to observe the contact condition of the edge foot of the solid tube cofferdam 20 and the bare rock, block stones are filled in the position where the edge foot and the bare rock have larger gaps to shield the gaps or partially shield the gaps, and then the underwater concrete is poured to avoid excessive leakage of the underwater concrete.
During construction of steep bare rocks having terrains such as gullies, since the shape and the edge feet of the lower end of the solid tube cofferdam 20 manufactured according to the form of the gully often have deviation, which may cause difficulty in manufacturing or lowering in place, one or more hinged rods may be arranged at the positions of the edge feet of the solid tube cofferdam 20 corresponding to the gully, and the free ends of the hinged rods are obliquely lapped at the gully after the solid tube cofferdam 20 is in place, so as to form a fence structure, thereby preventing excessive outflow of underwater concrete. If necessary, the block stones can be filled, so that the block stones are propped against the fence structure, and the gully is further blocked.
As a specific embodiment of the deep water steep slope bare rock bored pile construction device provided by the present invention, the deep water steep slope bare rock bored pile construction device further includes the steps of:
F. and (3) removing the fixed platform 40, installing a hanging box cofferdam 30 on the upper part of the pile casing 10, draining water in the hanging box cofferdam 30, treating the top of the bored pile, and pouring a high pile cap and a vertical pier in the hanging box cofferdam 30.
As a specific embodiment of the device for constructing a bare rock bored pile in a deep water steep slope according to the present invention, in step F, the step of installing a hanging box cofferdam 30 on the casing 10 includes:
a front bracket 11 is preset on the upper portion of the casing 10, the hanging box cofferdam 30 is placed down along the casing 10 until the bottom of the hanging box cofferdam 30 is abutted to the front bracket 11, a reverse bracket 12 is installed on the casing 10 to be matched with the front bracket 11 to fix the bottom of the hanging box cofferdam 30, and then underwater concrete is poured between the bottom of the hanging box cofferdam 30 and the casing 10 for bottom sealing.
Referring to fig. 1, fig. 2 and fig. 4 together, the apparatus for constructing a bare rock bored pile in a deep water steep slope according to the present invention includes a casing 10 and a solid-tube cofferdam 20, wherein the casing 10 is vertically disposed under water and has a lower end extending to a bare rock under water to assist in driving the bored pile; the solid tube cofferdam 20 is arranged at the lower end of the pile casing 10 and is fixedly connected with the pile casing 10, one side of the lower end is embedded in a cofferdam embedding groove 61 which is preset on underwater bare rock, and the other side of the lower end is attached to the surface of the underwater bare rock.
Compared with the prior art, the construction device for the deep water steep slope bare rock bored pile provided by the invention has the advantages that the lower end of the solid barrel cofferdam 20 can be embedded into the cofferdam embedded groove 61 pre-arranged on the underwater bare rock and attached to the surface of the underwater bare rock, the pile casing 10 is temporarily fixed on the bare rock, the pile casing 10 is firmly fixed on the bare rock by combining the subsequent underwater concrete pouring and the bare rock, the subsequent bored pile can be driven, the construction difficulty is favorably reduced, and the safe and rapid construction of the deep water steep slope bare rock foundation is realized.
Referring to fig. 1, fig. 2, fig. 4 and fig. 5, as a specific embodiment of the apparatus for constructing a bare rock bored pile in a deep water steep slope, according to the present invention, a plurality of pile casings 10 are provided in a solid casing cofferdam 20, and the solid casing cofferdam 20 and the pile casings 10 are fixedly connected by a connecting column 13; a space for filling concrete is arranged between the solid tube cofferdam 20 and the pile casing 10.
Each side wall of the fixed tube cofferdam 20 comprises a supporting framework 21, an outer wall plate 22, an inner wall plate 23, a blade foot 24 and a plurality of partition plates 25, wherein the outer wall plate 22 is arranged on the outer side of the supporting framework 21; the inner wall plate 23 is arranged at the inner side of the supporting framework 21; the cutting edge 24 is arranged at the lower part of the supporting framework 21, is respectively connected with the outer wall plate 22 and the inner wall plate 23 in a sealing way and is used for supporting on bare rock; the plurality of partition boards 25 are vertically arranged between the outer wall board 22 and the inner wall board 23, and are used for dividing the space between the outer wall board 22 and the inner wall board 23 into a plurality of closed partitions.
The plurality of closed compartments are arranged around the axis of the solid tube cofferdam 20, certain water is injected into different closed compartments when the solid tube cofferdam 20 is lowered on the water surface so as to ensure that the solid tube cofferdam 20 keeps vertical (correct posture) water entering, and when the solid tube cofferdam 20 sinks, river water enters from the upper part and completely fills the closed compartments to avoid the solid tube cofferdam 20 from floating.
Referring to fig. 1, 3 and 5, as an embodiment of the apparatus for constructing a bare rock bored pile in a deep water steep slope according to the present invention, the apparatus further includes a hanging box cofferdam 30, and the hanging box cofferdam 30 is disposed at the upper end of the casing 10 and is fixedly connected to the casing 10.
The side wall structure of the hanging box cofferdam 30 can be a double-layer structure similar to the solid tube cofferdam 20, and comprises a supporting framework 21, an outer wall plate 22, an inner wall plate 23, a bottom plate and a plurality of compartment partition plates 25, wherein the outer wall plate 22 is arranged on the outer side of the supporting framework 21; the inner wall plate 23 is arranged at the inner side of the supporting framework 21; the bottom plate is arranged at the lower part of the support framework 21, is respectively connected with the outer wall plate 22 and the inner wall plate 23 in a sealing way, and is used for being connected with the pile casing 10; the plurality of partition boards 25 are vertically arranged between the outer wall board 22 and the inner wall board 23, and are used for dividing the space between the outer wall board 22 and the inner wall board 23 into a plurality of closed partitions. The bottom plate can be a connecting column 13, the connecting column 13 is used for firstly connecting the hanging box cofferdam 30 with the pile casing 10, and then the underwater concrete is paved on the connecting column 13.
The hanging box cofferdam 30 comprises double-layer side walls and a bottom plate, a positive bracket 11 used for being located below the bottom plate of the hanging box cofferdam 30 and a reverse bracket 12 used for being located above the bottom plate of the hanging box cofferdam 30 are arranged on the pile casing 10, and the positive bracket 11 is matched with the positive bracket 11 to limit and fix the hanging box cofferdam 30.
The construction method and the device for the bare rock bored pile in the deep water steep slope provided by the invention are explained by a specific embodiment.
Because the mountains at the water bottom of the water area to be constructed are criss-cross in height, in the water area constructed on the pier, a diver carries a positioning instrument to dive and check the water bottom topography, so that the height and the coordinates of the mountains contacted with the water bottom after the solid tube cofferdam sinks are obtained, and the position coordinates of the U-shaped groove capable of accommodating the solid tube cofferdam is determined;
digging a U-shaped groove capable of accommodating the fixed tube cofferdam to be lowered down by utilizing the floating platform and the percussion drill in mountains and mountains at the water bottom;
the fixed cofferdam is prefabricated in a factory, the fixed cofferdam and the pile casings are assembled and firmly connected by using equipment such as a floating platform and the like, the fixed cofferdam and the pile casings are placed downwards and the pile casings 10 are lengthened, before the pile casings 10 are lengthened into water, the positions of the designed elevations of the hanging box cofferdam corresponding to the pile casings 10 are welded with the right corbels 11, and 4 right corbels 11 are welded on each pile casing 10 in 4 different directions;
the double-wall sleeve box arranged in the U-shaped groove is provided with equal-height edge feet 24, and the rest positions adjust the height of the edge feet 24 at the bottom of the solid tube cofferdam according to the shape of the underwater ground, so that the solid tube cofferdam can be matched with the curve of the underwater mountain after sinking;
the suspension box cofferdam is prefabricated in advance in a factory;
cleaning a riverbed at the sinking position of the jacket; and (3) installing the 1 st section (bottom section) double-wall solid cylinder cofferdam and the pile casing 10, and after the 1 st section is installed, performing water tightness inspection, and inspecting each splicing part in detail to ensure that the cabin is well sealed. And after the water tightness test is qualified, putting the 1 st section of double-wall solid tube cofferdam into water, continuously splicing and assembling other sections such as the 2 nd section, the 3 rd section and the like on the cofferdam, and lengthening the protective tube 10. After each section is installed, a water tightness test is required;
after the assembly of the solid tube cofferdams is finished, symmetrically injecting water into the cabins, wherein the water level difference between two adjacent cabins is not more than 3m, so that equal-height blade feet 24 of the solid tube cofferdam sink to a pre-drilled U-shaped groove, the rest blade feet 24 sink to a designed elevation, the solid tube cofferdam is placed to the bottom of the U-shaped groove, the double-wall inner cavity of the solid tube cofferdam at the U-shaped groove, the gap between the solid tube cofferdam and the rock wall at the U-shaped groove and the concrete in the gap between the inner wall of the solid tube cofferdam and the pile casing 10 are sequentially poured underwater, and the pile casing is fixed by utilizing the solid tube cofferdam;
erecting a fixed platform 40 by utilizing the pile casing 10 extending out of the water surface to finish the construction of the cast-in-situ bored pile;
dismantling the fixed platform 40, erecting a supporting structure by using the pile casing 10, assembling a double-wall steel sleeve box cofferdam, lowering the double-wall steel sleeve box cofferdam to a positive bracket 11 welded on the pile casing 10 in advance, and welding a reverse bracket 12 underwater above the upper part of the positive bracket 11 in contact with a bottom plate of the hanging box cofferdam to limit the floating movement of the hanging box cofferdam;
and (5) diving the diver to block the gap between the protective sleeve 10 and the hanging box cofferdam, and pouring concrete underwater to finish bottom sealing. Pumping water in the cofferdam of the suspension box to form a high pile cap construction dry environment;
chiseling pile heads, erecting a bearing platform template in the suspension box cofferdam, binding bearing platform steel bars, pouring high pile bearing platform concrete, and finishing maintenance;
erecting a pier body template, binding pier body reinforcing steel bars, pouring pier body concrete, and finishing maintenance
And dismantling the recyclable double-wall steel hanging box cofferdam to complete the bridge foundation construction.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. A construction method of a deep water steep slope bare rock drilled pile is characterized by being used in a deep water steep slope bare rock environment and comprising the following steps:
A. surveying and mapping the form of bare rock at a part to be constructed, and arranging a vertical cofferdam embedded groove (61) at least at the upper part of the bare rock according to the cross section shape of the solid-tube cofferdam (20);
B. prefabricating a pile casing (10), a solid casing cofferdam (20) and a suspension box cofferdam (30), and enabling the bottom shape of the solid casing cofferdam (20) to be matched with the lower shape of the bare rocks and the shape of the cofferdam embedded groove (61);
C. assembling and fixing the pile casings (10) in the solid casing cofferdam (20), lowering the pile casings (10) and the solid casing cofferdam (20) to the bare rock, and enabling the corresponding parts of the lower part of the solid casing cofferdam (20) to enter the cofferdam embedded groove (61);
D. firstly sending a diver to observe the contact condition of the cutting edge of the solid tube cofferdam and the bare rock, filling block stones at the position where the cutting edge has a larger gap with the bare rock to shield or partially shield the gap, pouring underwater concrete between the solid tube cofferdam (20) and the pile casing (10) and in the cofferdam embedded groove (61), and consolidating the solid tube cofferdam (20), the pile casing (10) and the bare rock into a whole;
E. a fixed platform (40) is erected at the upper part of the pile casing (10), and a drilled pile is driven;
in the step A, the step of arranging a vertical cofferdam embedded groove (61) comprises the following steps:
the cofferdam embedded groove (61) is positioned, the cofferdam embedded groove (61) is vertically arranged on the bare rock by using a floating platform and a percussion drill, the cofferdam embedded groove (61) is U-shaped in the overlooking direction, part of the bare rock on the steep slope is separated from the surrounding rock mass, and a bump capable of being contained in the solid tube cofferdam (20) is formed so as to limit the solid tube cofferdam (20) and prevent the solid tube cofferdam (20) from sliding downwards along the steep slope;
the solid tube cofferdam (20) is of an inner-outer double-wall structure, the inner wall and the outer wall are separated into a plurality of closed compartments arranged around the axis of the solid tube cofferdam (20) by vertical partition plates, the pile casing (10) is provided with a plurality of sections which can be connected end to end, and the step C comprises the following steps:
firstly, connecting a fixed-barrel cofferdam (20) with one section of the pile casing (10) on a floating platform, controlling the fixed-barrel cofferdam (20) to sink and adjust balance in a mode of injecting water and discharging water into the closed compartment, and simultaneously connecting the rest sections of pile casings (10) with a first section of pile casing (10) until the corresponding part at the lower part of the fixed-barrel cofferdam (20) enters a cofferdam embedding groove (61);
the construction device for the deepwater steep slope bare rock drilled pile further comprises the following steps:
F. dismantling the fixed platform (40), installing a hanging box cofferdam (30) at the upper part of the pile casing (10), draining water in the hanging box cofferdam (30), treating the top of the bored pile, and pouring a high pile cap and a vertical pier in the hanging box cofferdam (30);
in the step F, the step of installing the hanging box cofferdam (30) on the upper part of the pile casing (10) comprises the following steps:
presetting a positive corbel (11) on the upper part of a pile casing (10), lowering a hanging box cofferdam (30) along the pile casing (10) until the bottom of the hanging box cofferdam (30) is abutted against the positive corbel (11), then installing a reverse corbel (12) on the pile casing (10) to be matched with the positive corbel (11) to fix the bottom of the hanging box cofferdam (30), and then pouring underwater concrete between the bottom of the hanging box cofferdam (30) and the pile casing (10) for bottom sealing;
wherein, bare rock bored concrete pile construction equipment in deep water abrupt slope includes:
the pile casing (10) is vertically arranged underwater, and the lower end of the pile casing extends to an underwater bare rock to assist in driving a drilled pile;
the fixed barrel cofferdam (20) is arranged at the lower end of the pile casing (10) and is fixedly connected with the pile casing (10), one side of the lower end is embedded in a cofferdam embedding groove (61) preset on underwater bare rock, and the other side of the lower end is attached to the surface of the underwater bare rock;
a plurality of pile casings (10) are arranged in the solid casing cofferdam (20), and the solid casing cofferdam (20) is fixedly connected with the pile casings (10) through a connecting column (13); a space for filling concrete is arranged between the fixed cylinder cofferdam (20) and the pile casing (10);
each side wall of the solid tube cofferdam (20) comprises:
a support skeleton (21);
an outer wall plate (22) provided outside the support frame (21);
an inner wall plate (23) provided inside the support frame (21);
the cutting edge (24) is arranged at the lower part of the supporting framework (21), is respectively connected with the outer wall plate (22) and the inner wall plate (23) in a sealing way, and is used for supporting on bare rock; and
the partition boards (25) are vertically arranged between the outer wall board (22) and the inner wall board (23) and are used for dividing the space between the outer wall board (22) and the inner wall board (23) into a plurality of closed partitions;
the construction device for the bare rock drilled pile on the deep water steep slope further comprises a hanging box cofferdam (30), wherein the hanging box cofferdam (30) is arranged at the upper end of the pile casing (10) and is fixedly connected with the pile casing (10);
the suspension box cofferdam (30) comprises a double-layer side wall and a double-layer bottom plate, a pile casing (10) is provided with a bracket (11) below the bottom plate of the suspension box cofferdam (30) and a reverse bracket (12) above the bottom plate of the suspension box cofferdam (30), and the bracket (11) is matched with the bracket (11) to limit and fix the suspension box cofferdam (30).
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| CN113216231A (en) * | 2021-04-28 | 2021-08-06 | 湖南常德路桥建设集团有限公司 | Hanging box cofferdam structure and deepwater bearing platform construction method applying same |
| CN113684848B (en) * | 2021-09-03 | 2023-01-31 | 安徽省公路桥梁工程有限公司 | Construction process of steel cofferdam with deep water steep undulating rock surface |
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| JP2001323476A (en) * | 2000-03-06 | 2001-11-22 | Takami Kogyo:Kk | Cofferdam constuction method and cofferdam structural body |
| CN101429761A (en) * | 2008-11-18 | 2009-05-13 | 中铁大桥局集团第二工程有限公司 | Deep sea bare rock pier protection barrel, positioning pile, underwater cofferdam integrated platform and construction method |
| CN106968176A (en) * | 2017-03-24 | 2017-07-21 | 中建三局基础设施工程有限公司 | A kind of embedding batholith foundation construction of bridge deepwater |
| CN109113086B (en) * | 2018-10-24 | 2019-08-20 | 湖北工业大学 | A kind of steel reinforced concrete combined cofferdam construction method in deep water exposed bedrock riverbed area |
| DE202018005260U1 (en) * | 2018-11-13 | 2018-11-28 | Matthäi Wasserbau GmbH & Co. KG | Construction pit enclosures and apparatus and system for constructing a construction pit enclosure in the area of water-side borehole outlet points |
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