CN109183829B

CN109183829B - Construction method of large-height-difference small-clear-distance underwater bearing platform

Info

Publication number: CN109183829B
Application number: CN201810885584.3A
Authority: CN
Inventors: 胡义新; 马琼锋; 陈丹; 刘宁波; 朱虎; 王路; 张俊光; 李送根; 戴威; 颜松
Original assignee: CCCC Second Harbor Engineering Co
Current assignee: CCCC Second Harbor Engineering Co; CCCC Wuhan Harbour Engineering Design and Research Institute Co Ltd
Priority date: 2018-08-06
Filing date: 2018-08-06
Publication date: 2020-11-06
Anticipated expiration: 2038-08-06
Also published as: CN109183829A

Abstract

The invention discloses a construction method of a large-altitude-difference small-clear-distance underwater bearing platform, which is suitable for two or more adjacent bearing platforms and comprises the following steps: s1, arranging a drilling platform, sinking a steel pile casing, and performing cast-in-situ bored pile construction; s2, arranging a guide device on the steel casing, and dismantling the drilling platform beam system; and S3, inserting and driving steel sheet piles of the bearing platform with large burial depth on the upstream face by taking the guide device as a guide, inserting and driving steel sheet piles of the adjacent bearing platform with shallow burial depth, ensuring that the steel sheet piles are folded by the lock catches, and respectively sealing the partition plates and the two adjacent cofferdam systems into a ring, so that the adjacent bearing platforms are surrounded by the same steel sheet pile and are partitioned by the partition plates. The steel sheet pile cofferdam has the advantages of being suitable for the situations that a plurality of bearing platforms are close in distance, the geological conditions of adjacent bearing platforms are different greatly, and the bearing platforms have different elevations, simple in structure and low in cost, and can be widely applied to the technical field of steel sheet pile cofferdams.

Description

Construction method of large-height-difference small-clear-distance underwater bearing platform

Technical Field

The invention relates to the technical field of bearing platform construction. More particularly, the invention relates to a construction method of a large-altitude-difference small-clear-distance underwater bearing platform.

Background

In the bridge foundation construction, for adjacent multiple bearing platforms, the traditional cofferdam structure mode is that the arrangement construction is carried out according to the size of the bearing platform and the height of the construction water level, and generally, a single bearing platform is arranged, the arrangement construction of one bearing platform and the other bearing platform is carried out after the construction is finished, the construction period is long, and the investment of materials, machinery and personnel is large.

In bridge foundation construction, for adjacent multiple bearing platforms, a traditional large buried depth cofferdam construction method usually adopts double-arm steel cofferdam construction or steel sheet pile cofferdam construction, but the double-arm steel cofferdam is large in investment and low in economical efficiency; the steel sheet pile cofferdam usually adopts 2 methods aiming at large burial depth: separate construction, namely constructing a bearing platform with deeper buried depth, removing cofferdam sheet piles around the bearing platform after the pier body is drained, constructing an adjacent bearing platform, and continuously inserting and driving steel sheet piles, wherein the steps are circulated in such a way that the lower part foundation construction is completed only when all the pier bodies are drained, the process is repeated, the construction period is long, and the cost is high; integral construction: the integral cofferdam construction is adopted for the adjacent bearing platforms, the adjacent bearing platforms are inserted and beaten once to form a ring and are sealed, the bearing platform sheet pile with large burial depth is used as a reference standard, the height difference of the adjacent bearing platforms is large, the square amount of bottom sealing concrete is large, the sludge absorption amount of the integral cofferdam is large, the construction period is long, the sheet pile investment is large, the cost is high, and the construction difficulty is large.

Disclosure of Invention

An object of the present invention is to solve at least the above problems and to provide at least the advantages described later.

The invention also aims to provide a construction method of the underwater bearing platform with large height difference and small clear distance, which is suitable for two or more adjacent bearing platforms and comprises the following steps:

s1, arranging a drilling platform, sinking a steel pile casing, and performing cast-in-situ bored pile construction;

s2, arranging a guide device on the steel casing, and dismantling the drilling platform beam system;

s3, inserting and driving steel sheet piles of a bearing platform with large embedding depth on the upstream face by taking the guide device as a guide, and then inserting and driving steel sheet piles of an adjacent bearing platform with shallow embedding depth to ensure that the steel sheet piles are folded by the lock catches, and the partition plates and the two adjacent cofferdam systems are respectively sealed into a ring, so that the adjacent bearing platforms are surrounded by the same steel sheet pile and are partitioned by the partition plates;

s4, carrying out water excavation in the sub-chambers of the cofferdam respectively, and mounting supporting enclosing purlins and inner supports layer by layer;

s5, excavating the cofferdam sub-compartments with water to the bottoms of foundation pits with different elevations respectively, and pouring bottom sealing concrete respectively;

s6, pumping water in the cofferdam to the outside of the cofferdam after the bottom sealing concrete meets the strength requirement;

s7, cutting off the steel casing, and carrying out bearing platform construction;

s8, after the bearing platform and the pier body are drained, constructing the foundation of the adjacent bearing platform;

and S9, after all the bearing platform foundations and pier bodies are drained, balancing the inner water head and the outer water head when the cofferdam is removed, and removing the steel sheet piles one by one to be installed on the side parts of the bearing platforms.

Preferably, the cofferdam comprises:

the steel sheet piles are inserted into the peripheries of all the bearing platforms for one circle, and all the bearing platform circles are arranged in the steel sheet piles;

a plurality of partition plates are arranged between any two adjacent bearing platforms and used for isolating bottom sealing concrete between the adjacent bearing platforms, and the plurality of partition plates are matched with a circle of steel sheet piles to isolate each bearing platform into an independent sub-cabin;

and the inner wall of each compartment is provided with a plurality of layers of supporting enclosing purlins from top to bottom.

Preferably, the partition plate is a steel sheet pile.

Preferably, the separator includes:

the partition plate comprises a partition plate body, a pair of square plates with the same height as the partition plate body are hinged to two ends of the partition plate body in the length direction, and a layer of wear-resistant rubber is attached to the outer walls of the square plates;

for any pair of the square plates, the square plates are respectively connected with one vertical side surface of the partition plate body through a horizontally arranged adjusting device;

the adjusting device comprises a first screw, a pair of first sleeves, two pairs of stop blocks and a pair of sealing plugs;

the first sleeves are of a tubular structure with one closed end and are provided with internal threads, the open ends of the pair of first sleeves are respectively screwed at the two ends of the first screw rod through the internal threads, the closed ends of the pair of first sleeves are respectively hinged with the square plate and the partition plate body, and the first sleeves are provided with a plurality of through holes communicated with the inner cavities of the first sleeves;

the rotation directions of external threads at two ends of the first screw rod are opposite, two end faces of the first screw rod are recessed to form a coaxial round blind hole, one end of a spring is coaxially fixed at the hole bottom of the round blind hole, a circular plate is coaxially fixed at the other end of the spring, one side of the circular plate, which is far away from the spring, is coaxially provided with a cylindrical sponge, and the outer diameter of the cylindrical sponge is slightly larger than the diameter of the first screw rod;

the two pairs of stop blocks are cuboid, each pair of stop blocks corresponds to one round blind hole, the pair of stop blocks are oppositely arranged in the corresponding round blind holes, and the inner side ends of the stop blocks are hinged with the inner walls of the round blind holes through hinges;

the pair of sealing plugs are respectively arranged at the outer ends of the pair of round blind holes and seal the round blind holes;

when the sealing plug seals the round blind hole, the spring is in a non-deformation state; when the pair of stop blocks rotate to the length direction of the stop blocks is vertical to the hole wall of the round blind hole, the round plate can be clamped at the outer side of the stop blocks; when the length directions of the pair of stop blocks are parallel to the hole walls of the round blind holes, the pair of stop blocks do not interfere the circular plate to extend out of or into the round blind holes.

Preferably, the inner support comprises:

the rotation directions of the external threads at the two ends of the second screw rod are opposite;

a pair of second sleeves which are cylindrical and have internal threads, wherein one ends of the second sleeves are respectively in threaded connection with two ends of the second screw;

the other ends of the second sleeves, which are far away from the screw rods, are oppositely hinged to the supporting purlin.

The invention at least comprises the following beneficial effects:

the cofferdam structure form has popularization and use values under certain conditions, can be widely applied to construction of adjacent bearing platforms, is particularly suitable for bearing platforms with large height difference and small clear distance, and has the conditions that the geological conditions of the adjacent bearing platforms are greatly different and have different elevations.

Secondly, the novelty of the structure of the invention: the invention has the advantages of simple structure, economic investment, stable and reliable structure, large bearing capacity and flexible turnover, reduces the installation and disassembly of the steel sheet pile, reduces the personnel investment and shortens the construction period. The cofferdam has the advantages of simple and novel structural form, superior mechanical property, high stability, less times of installation and disassembly, less investment of personnel and materials and cost saving.

Thirdly, the invention has strong pertinence: the cofferdam structure is strong in pertinence and suitable for foundation construction of the underwater bearing platform with large height difference and small clear distance.

Fourthly, the economy of the bay of the invention: the intermediate bulkhead plate has stronger integrity, plays a role in differential construction and isolation, the thickness of each self-bottom-sealing concrete of adjacent bearing platform foundations is poured according to the difference of respective water head, the mud absorption amount of the bearing platform area is constructed according to the difference of respective needs, and the sheet piles are different in length according to the difference of the water head difference and the height difference of the respective bearing platform, so that the material investment is reduced, and the cost is reduced.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

FIG. 1 is a top view of a structure of the present invention;

FIG. 2 is a front view of the structure of the present invention;

FIG. 3 is a schematic view of the connection between the square plate and the steel sheet pile according to the present invention;

FIG. 4 is a view showing the connection between the separator body and the square plates at both ends thereof according to the present invention;

FIG. 5 is an enlarged view taken at A of FIG. 3 according to the present invention;

FIG. 6 is an enlarged view of FIG. 3 at B according to the present invention;

FIG. 7 is a schematic structural view of a first screw according to the present invention;

FIG. 8 is a diagram illustrating a state where a pair of stoppers according to the present invention are rotated to be perpendicular to the wall of a circular blind hole;

FIG. 9 is a schematic view of an adjustment device according to the present invention;

FIG. 10 is an enlarged view at C of FIG. 7;

fig. 11-17 are construction flow charts of the first embodiment.

Description of reference numerals: 1. supporting enclosing purlin, 2, steel sheet pile, 3, partition board, 4, bottom sealing concrete, 5, inner support, 6, partition board body, 7, square plate, 8, adjusting device, 9, first screw rod, 10, first sleeve, 11, spring, 12, circular plate, 13, sponge, 14, sealing plug, 15, stop block, 16, round blind hole, 17 and hinge.

Detailed Description

The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.

It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

As shown in fig. 1-17, the present invention provides a method for constructing a large-height-difference small-clearance underwater platform, which is suitable for two or more adjacent platforms, comprising the following steps:

In this solution, the partition may be a steel sheet pile. The large height difference is that the difference of the bottom elevations of two adjacent bearing platforms is large, if the two adjacent bearing platforms are integrally constructed, the measure quantity is large, and the water level differences of the two bearing platforms are different, so that the shape selection lengths of the steel sheet piles are different. The small clear distance means that the distance between two adjacent bearing platforms is smaller, the distance is small enough to beat one row when inserting and beating the steel sheet piles between the two bearing platforms, and if two rows are beaten, no manual operation space exists between the two rows of steel sheet piles. Step S4 follows the principle that dredging should follow layering, symmetry, slow unloading. The guiding device is a single-side purlin enclosing support or a double-side cofferdam support, and is the prior art and is not described herein any more.

In another technical solution, the cofferdam includes:

the steel sheet piles 2 are inserted into the peripheries of all the bearing platforms for one circle, and all the bearing platforms are arranged in the steel sheet piles;

a plurality of partition plates 3 are arranged between any two adjacent bearing platforms, each partition plate 3 is used for isolating bottom sealing concrete 4 between the adjacent bearing platforms, and the plurality of partition plates 3 are matched with the steel sheet piles 2 to isolate each bearing platform into an independent subdivision;

and supporting enclosing purlins 1, wherein the inner wall of each compartment is provided with a plurality of layers of supporting enclosing purlins 1 from top to bottom.

In the technical scheme, the unequal-length steel sheet pile cofferdam with the compartments mainly aims at the construction of a plurality of adjacent bearing platforms. In the embodiment shown in fig. 1-2, two bearing platforms are integrally included in a circle formed by enclosing steel sheet piles, a layer of partition plate 3 is arranged between the adjacent bearing platforms to isolate bottom-sealing concrete 4, and the two bearing platforms can be synchronously constructed without mutual influence, so that the defects that the adjacent bearing platforms have different elevations, short distance, inconsistent thickness of the bottom-sealing concrete 4, large investment in materials, machinery and personnel during one-by-one construction and the like are overcome. The invention simplifies the structural form of foundation construction, fully utilizes resources, reduces construction measures, saves cost and shortens construction period. The steel sheet pile fence is a closed loop fence formed by connecting a plurality of steel sheet piles 2 through buckles, all bearing platforms are arranged in the fence in a surrounding mode, and the partition plates are arranged between the adjacent bearing platforms to enable the bearing platforms to be mutually independent.

The concrete construction method is that after steel sheet pile fences are erected, a partition plate 3 is additionally arranged in the middle of an adjacent bearing platform, a supporting surrounding purlin 1 and an inner support 5 are installed, bottom sealing concrete 4 with different thicknesses is poured according to the elevation and the geological condition of the respective bearing platform after mud is sucked from the bottom of the enclosing purlin, and then water is pumped to install a template to carry out bearing platform construction. The inserting depth of the partition plate is determined according to the inserting depth of the steel sheet piles of the adjacent bearing platforms separated by the partition plate, and is consistent with the depth of the steel sheet pile with the deeper depth.

In another technical scheme, the partition plate 3 is a steel sheet pile.

In this kind of technical scheme, the steel sheet pile convenient for draw materials, but when baffle and two cushion cap outlying steel sheet piles fold, need welding, shutoff, but underwater welding cost is higher, and is inconvenient moreover.

In another solution, the partition 3 comprises:

the partition board comprises a partition board body 6, wherein a pair of square boards 7 equal in height to the partition board body are hinged to two ends of the partition board body in the length direction, and a layer of wear-resistant rubber is attached to the outer walls of the square boards 7;

for any pair of the square plates 7, the square plates are respectively connected with a vertical side surface of the clapboard body 6 through a horizontally arranged adjusting device 8;

the adjusting device 8 comprises a first screw 9, a pair of first sleeves 10, two pairs of stop blocks 15 and a pair of sealing plugs 14;

the first sleeves 10 are of a tubular structure with one closed end and are provided with internal threads, the open ends of the first sleeves 10 are respectively screwed at the two ends of the first screw rod 9 through the internal threads, the closed ends of the first sleeves 10 are respectively hinged with the square plate 7 and the partition plate body 6, and the first sleeves 10 are provided with a plurality of through holes communicated with the inner cavities of the first sleeves;

the turning directions of the external threads at two ends of the first screw rod 9 are opposite, two end faces of the first screw rod 9 are recessed to form a coaxial round blind hole 16, one end of a spring 11 is coaxially fixed at the bottom of the round blind hole 16, a round plate 12 is coaxially fixed at the other end of the spring 11, a cylindrical sponge 13 is coaxially arranged on one side of the round plate 12, which is far away from the spring 11, the outer diameter of the cylindrical sponge 13 is slightly larger than the diameter of the first screw rod 9, the outer wall of the sponge 13 is in a thread shape, and the thread-shaped outer wall of the sponge 13 is matched with the internal thread of the first sleeve 10;

the two pairs of the stop blocks 15 are cuboid, each pair of the stop blocks corresponds to one round blind hole 16, the pair of the stop blocks 15 are oppositely arranged in the corresponding round blind holes 16, and the inner side ends of the stop blocks 15 are hinged with the inner walls of the round blind holes 16 through hinges 17;

a pair of the sealing plugs 14 which are respectively arranged at the outer ends of the pair of round blind holes 16 and seal the same;

when the sealing plug 14 seals the round blind hole, the spring 11 is in a non-deformation state; when the pair of stoppers 15 rotate to the length direction of the stoppers is vertical to the hole wall of the round blind hole 16, the round plate 12 can be clamped at the outer side of the stoppers; when the length direction of the pair of stoppers 15 is parallel to the hole wall of the round blind hole 16, the pair of stoppers do not interfere with the circular plate 12 to extend out of or into the round blind hole.

In this kind of technical scheme, after the construction of steel sheet pile 2 is accomplished, according to the position of two bearing platform fold department's steel sheet pile 2, the angle of square slab 7 and baffle body 6 has been adjusted, guarantee to beat at baffle body 6 and insert the completion back, two pairs of square slabs 7 and baffle body 6 can separate into two completely independent bays with two bearing platform's peripheral steel sheet pile 2, saved underwater welding's process, and, the leakproofness has been guaranteed through the outside rubber of square slab 7, and when the angle of square slab 7 and baffle 3 that actually need and the angle of calculation had the error, still can better sealing.

Moreover, a sponge 13 is arranged, when the first screw 9 is constructed underwater, the round blind hole 16 is sealed by the sealing plug 14 as shown in fig. 7, water is prevented from entering the round blind hole 16, after the construction is completed, the sealing plug 14 is opened, the sponge 13 protrudes out of the round blind hole 16 as shown in fig. 8, then two ends of the first screw 9 are connected with the sleeve, the first screw 9 is rotated, the sponge 13 absorbs moisture in the sleeve, the depth of the first screw 9 penetrating into the first sleeve 10 cannot be adjusted when the mode is rusted to cause repeated use, and therefore the angle between the square plate 7 and the partition plate body 6 is adjusted, and sealing cannot be achieved. If lubrication is necessary, the sponge 13 is wetted with a lubricating oil, and the interiors of the first screw 9 and the first sleeve 10 are lubricated and coated. The adjusting device and the supporting enclosing purlin 1 are arranged in different horizontal planes in a staggered mode. Generally, the adjusting device is arranged above the elevation of the guide frame, if the adjusting device is designed below the guide frame, the first screw rod of the adjusting device needs to be taken down before inserting and beating the partition body so as to avoid the guide frame, and the first screw rod of the adjusting device is installed after the partition body is inserted and beaten in place. When the pair of stoppers 15 rotate to the length direction thereof is perpendicular to the hole wall of the round blind hole 16, as shown in fig. 8; when the length direction of the pair of stoppers 15 is parallel to the hole wall of the round blind hole 16, as shown in fig. 7. In the case shown in fig. 7, for any one of the stoppers, the inner vertical end face of the stopper is abutted against and fixed to the blade of one hinge 17, the other blade of the hinge 17 is abutted against and fixed to the inner wall of the round blind hole adjacent to the stopper, and the pair of blades is in a vertical state as shown in fig. 10. The outer diameter of the sponge 13 is slightly larger than the diameter of the first screw 9, which means that the outer diameter of the sponge is larger than that of the screw when the sponge is in a non-compression state, and the outer diameter of the sponge is generally 2-3cm larger than that of the screw.

In another aspect, the inner support 5 includes:

In this kind of technical scheme, with interior support 5 design for the integrated configuration of a pair of second sleeve and second screw rod, interior support 5 structure is the same with adjusting device 8's structure, see fig. 9, after supporting the installation of enclosing purlin, the spiro union second screw rod one end to one of them second sleeve inside, with the other end of second screw rod facing another second sleeve, then revolve the other end of second screw rod to another second sleeve in, can, this kind of mode simple structure, and with low costs, can dismantle, the length of interior support is adjustable, can be applicable to the cofferdam of different widths.

Example one

Taking two adjacent bearing platforms as an example, the two bearing platforms are a gallery bridge bearing platform and a main pier bearing platform respectively, and the construction process comprises the following steps: s1, arranging a drilling platform, sinking a steel pile casing, and performing cast-in-situ bored pile construction;

s3, inserting and driving the steel sheet piles by taking the guide device as a guide, and performing the following steps from the first step to the fifth step:

the method comprises the following steps: the gallery bridge cushion cap steel sheet pile is inserted to the cisoid, promptly: along the river trend, firstly inserting and digging two sides of a cofferdam of a gallery bridge bearing platform; as shown in fig. 11;

step two: inserting and driving the steel sheet pile of the main pier bearing platform in the forward direction, namely: inserting and driving steel sheet piles on two sides of a cofferdam of a main pier bearing platform along the river trend; as shown in fig. 12;

step three: the gallery bridge cushion cap upper reaches steel sheet pile closes up, promptly: perpendicular to the river trend, inserting and constructing steel sheet piles on one side of the upstream of the gallery bridge bearing platform, and folding the steel sheet piles with the steel sheet piles on the two sides in the first step; as shown in fig. 13;

step four: the upstream steel sheet pile of main pier cap folds, promptly: perpendicular to the river trend, inserting and driving the steel sheet piles on one side of the upstream of the main pier bearing platform, folding the steel sheet piles with the steel sheet piles on the two sides in the step one, and carrying out closed-loop subdivision on the gallery bridge bearing platform; the steel sheet piles inserted and driven in the step are the partition plates; as shown in fig. 14;

step five: and (3) closing the downstream steel sheet piles of the main pier cap, namely: perpendicular to the river trend, inserting and driving the steel sheet piles on one side of the downstream of the main pier bearing platform, and folding the steel sheet piles on the two sides in the second step to divide the main pier bearing platform into closed loops; as shown in fig. 15;

s4, carrying out water excavation in the sub-chambers of the cofferdam respectively, and mounting a supporting surrounding purlin 1 (shown in figure 16) and an inner support 5 (shown in figure 17) layer by layer;

While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.

Claims

1. A construction method of a large-height-difference small-clear-distance underwater bearing platform is characterized in that the construction method is suitable for two or more adjacent bearing platforms, and comprises the following steps:

s9, after all the bearing platform foundations and pier bodies are drained, when the cofferdam is dismantled, balancing the internal and external water heads, and removing the steel sheet piles one by one to be installed on the side parts of the bearing platforms;

wherein, the cofferdam includes:

supporting enclosing purlins, wherein the inner wall of each compartment is provided with a plurality of layers of supporting enclosing purlins from top to bottom;

the separator includes:

2. The method as claimed in claim 1, wherein the partition is a steel sheet pile.

3. The method of constructing a high-altitude-difference small-clearance underwater cap as claimed in claim 1, wherein said inner support comprises: