CN216839516U - Bottomless steel pouring jacket cofferdam suitable for complex geological conditions under water - Google Patents

Abstract

The utility model relates to a bottomless steel jacket box cofferdam applicable to underwater complex geological conditions, which comprises a plurality of steel jacket boxes, wherein the steel jacket boxes are connected after being lowered to form a cofferdam structure with an insertion part at the bottom; each steel jacket box is formed by detachably assembling a plurality of wall plates, and the wall plates form a cavity structure after being assembled; the temporary splicing platform is built through an existing pile foundation; the limiting mechanism is positioned on the temporary assembling platform, and the steel sleeve box is assembled in a limiting space formed by the limiting mechanism; and a plurality of suspension points are arranged along the circumferential direction of the steel sleeve box, and the assembled steel sleeve box is placed through the suspension points to form the cofferdam structure. The utility model provides a cofferdam, the atress is clear and definite, and under the operating mode that draws water, the intensity of cofferdam structure, rigidity, stability homoenergetic satisfy the operation requirement, and the structural performance is superior, and the bearing capacity is done, safe and reliable.

Description

Bottomless steel pouring jacket cofferdam suitable for complex geological conditions under water

Technical Field

The utility model belongs to the technical field of the bridge construction technique and specifically relates to a no end steel pouring jacket cofferdam suitable for complicated geological conditions under water.

Background

The steel casing box cofferdam is a cofferdam form commonly used in bridge engineering, mainly plays the roles of water and soil prevention in the construction of a bridge substructure, can also be used for concrete pouring construction in a bearing platform engineering, plays a role of water prevention, and can also serve as a template for construction. The method is suitable for constructing the pier bearing platform at the position where the river shoal and river water are not too deep and the flow speed is small. The structure has the advantages of clear stress, simple structure, suitability for on-site manufacture and assembly, simple construction machine, easy construction operation and reusable cofferdam. However, the traditional steel boxed cofferdam is only suitable for shallow river talks, parts with less deep river water and small flow rate, has high requirement on a river bed and serious water seepage, is not suitable for complicated underwater geological conditions, and causes great trouble to actual construction.

SUMMERY OF THE UTILITY MODEL

The utility model provides a not enough to prior art, the utility model provides a no end steel jacket case cofferdam suitable for complicated geological conditions under water, through the portion of inserting, it is fixed in order to realize inserting of steel jacket case, it can the disect insertion riverbed, then through hanging the point, cooperation cable suspension device etc., and then can directly put the design elevation down, utilize interim assembly platform and pile foundation steel casing, ensure intensity, combine inside supporting mechanism, ensure the intensity of take the altitude, then utilize the assembly platform, pour behind the back cover concrete, make the steel jacket case and the riverbed of embedding riverbed, constitute confined interim water proof structure jointly. The cofferdam construction method has the advantages of ingenious structure technology, high construction precision and convenience in sinking, and is suitable for cofferdam construction under the condition of underwater complex geology.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a bottomless steel boxed cofferdam applicable to underwater complex geological conditions, which comprises,

the steel sleeve boxes are connected after being lowered down to form a cofferdam structure with an insertion part at the bottom;

each steel jacket box is formed by detachably assembling a plurality of wall plates, and the wall plates form a cavity structure after being assembled;

the temporary assembling platform is built through an existing pile foundation;

the limiting mechanism is positioned on the temporary assembling platform and forms a limiting space, and the steel sleeve box is assembled in the limiting space;

and a plurality of suspension points are arranged along the circumferential direction of the steel sleeve box, and the assembled steel sleeve box is placed through the suspension points to form the cofferdam structure.

As a further improvement, the utility model discloses an follow the circumference of steel jacket case is located the bottom of steel jacket case is equipped with a plurality of gear column structure, and is a plurality of gear column structure forms cofferdam structure's the portion of inserting.

As a further improvement of the present invention, the wall plate includes a panel and a frame structure provided in the panel, and the panel forms a protective layer of the frame structure.

As the utility model discloses a further improvement, every frame construction includes a plurality of vertical floor that connect gradually to and with vertical floor vertically horizontal floor, vertical floor is the I-beam, the horizontal floor that the channel-section steel structure formed set up in the upper and lower both sides of I-beam.

As the utility model discloses a further improvement, interim assembly platform is a plurality of, and the back is connected to the interim assembly platform of a plurality of, forms the inner circle structure that is located cofferdam structure inboard.

As the utility model discloses a further improvement, still including being located the steel bracket between interim assembly platform and the existing pile foundation, the steel bracket forms triangular support frame for support interim assembly platform.

As a further improvement of the utility model, still include the rail guard, the rail guard set up in the outside of steel pouring jacket, the crossbeam of rail guard bottom pass the steel pouring jacket with the steel bracket is connected.

As the utility model discloses a further improvement still transfers the mechanism including hanging, hang and transfer the mechanism and pass the support frame is hung hang transferring of some in order to realize the steel pouring jacket.

As the utility model discloses a further improvement, hang and transfer the mechanism and include power pack, power pack with the support frame is the base, drives and hangs the screw-thread steel of point connection, realizes elevating movement to realize transferring of steel jacket case.

As a further improvement, the power unit is a jack, the upper and lower of jack is equipped with first roof beam body and second roof beam body respectively, first roof beam body top is provided with the cushion through the nut, the jack is arranged in through the spike on the support frame.

Compared with the prior art, the utility model has the specific advantages that:

(1) the utility model provides a novel cofferdam form, traditional steel pouring jacket cofferdam receive the restriction of the geological conditions under the water, easily appear unable normal transfer and the serious problem of infiltration, the utility model discloses a bottomless steel pouring jacket cofferdam cancellation steel bushing bottom plate of the case, easily steel bushing box is transferred, is applicable to complicated geological conditions under water, to special geological conditions under water, still can adopt to strike and bore, machinery chisels out, means such as blasting under water. The utility model discloses no end cofferdam structural suitability is strong, has good engineering value.

(2) The utility model discloses simple structure, the atress is clear and definite, under the operating mode that draws water, the intensity of cofferdam structure, rigidity, stability homoenergetic satisfy the operation requirement, and structural performance is superior, and the bearing capacity does, safe and reliable.

(3) The utility model discloses having removed the bottom plate system and having adopted the construction of low pile cap, can having accomplished the bored pile construction in step, utilize drilling work platform and steel to protect a section of thick bamboo and provide the operation platform for the construction of bottomless steel bushing box, practiced thrift field work volume greatly, the efficiency of construction is high, and the construction speed is fast.

(4) The utility model discloses simple structure, the construction of sinking is disturbed for a short time, and the back cover concrete is direct and the riverbed contact, and the vertical atress of pouring jacket is little, and wallboard reuse rate is high, and economic nature is good, and the construction degree of difficulty is less relatively.

Drawings

FIG. 1 is a schematic structural diagram of a bottomless steel pouring jacket cofferdam applicable to complex geological conditions under water provided by the utility model;

FIG. 2 is a top view of the bottomless steel pouring jacket cofferdam applicable to complex geological conditions under water provided by the utility model;

FIG. 3 is a schematic structural view of a steel jacket box provided by the present invention;

fig. 4 is a schematic structural diagram of a gear-like structure in a steel jacket box provided by the present invention;

fig. 5 is a layout diagram of the pile foundation steel casing provided by the utility model;

fig. 6 is an assembly diagram of the pile foundation steel casing provided by the present invention;

fig. 7 is a schematic structural view of a suspension point provided by the present invention;

fig. 8 is a schematic structural view of the hanging and lowering mechanism provided by the present invention;

fig. 9 is a schematic structural view of the limiting mechanism provided by the present invention;

fig. 10 is a schematic structural view of a limiting mechanism provided by the present invention;

fig. 11 is a schematic structural view of an internal supporting mechanism provided by the present invention;

in the figure:

100. a steel jacket box; 110. a gear-like structure; 1. wall plates; 1-1, a panel; 1-2, transverse rib plates; 1-3, longitudinal rib plates; 1-4, connecting members; 2. temporarily assembling the platform; 2-1, existing pile foundations; 2-2, steel corbels; 2-3, protecting the fence; 3. a hanging and lowering mechanism; 3-1, a power unit; 3-2, supporting feet; 3-3, deformed steel bar; 3-4, a nut; 3-5, cushion blocks; 3-6, a first beam body; 3-7, a second beam body; 3-8, hanging points; 4. an internal support mechanism; 4-1-triangular stiffening plates; 5. a guidance system; 6. a limiting mechanism; 7. and (5) sealing the bottom concrete.

Detailed Description

For the utility model discloses more clearly understand, it is right below with the accompanying drawing the utility model discloses a retractable solar energy traffic light further explains for road construction, and the embodiment described herein only is used for explaining the utility model discloses to be not used for the restriction the utility model discloses.

Example 1

In the embodiment, the core structure of the bottomless steel pouring jacket cofferdam applicable to the underwater complex geological condition is mainly introduced.

Referring to fig. 1-11, the bottomless steel boxed cofferdam for underwater complex geological conditions in the embodiment comprises,

the steel sleeve boxes 100 are provided, the steel sleeve boxes 100 are provided in a plurality, and the steel sleeve boxes 100 are placed downwards and then connected to form a cofferdam structure with an insertion part at the bottom;

the steel pouring jacket comprises wall plates 1, wherein each steel pouring jacket 100 is formed by detachably assembling a plurality of the wall plates 1, and the wall plates 1 form a cavity structure after being assembled;

the temporary splicing platform 2 is built through an existing pile foundation 2-1;

the limiting mechanism 6 is positioned on the temporary assembling platform 2, the limiting mechanism 6 forms a limiting space, and the steel pouring jacket 100 is assembled in the limiting space;

and a plurality of suspension points 3-8 are arranged along the circumferential direction of the steel pouring jacket 100, and the assembled steel pouring jacket 100 is lowered through the suspension points 3-8 to form the cofferdam structure.

Compared with the prior art, the cofferdam is firstly transferred through the inserting part, the bottom plate of the steel sleeve box is cancelled, the steel sleeve box is easy to transfer, the cofferdam is suitable for complex geological conditions underwater, and means such as percussion drilling, mechanical chiseling and underwater blasting can be adopted for special geological conditions underwater. The bottomless cofferdam structure of the embodiment has strong adaptability and good engineering value.

Secondly, in this embodiment, be provided with the suspension point to the suspension of steel jacket box after assembling is transferred, in order to realize the construction of not co-altitude department, and then in the construction, steel jacket box wallboard can direct insertion riverbed, and through transferring device to design elevation, pours behind the back cover concrete, makes the steel jacket box and the riverbed of embedding riverbed, constitutes confined interim water proof structure jointly. The cofferdam construction method has the advantages of ingenious structure technology, high construction precision and convenience in sinking, and is suitable for cofferdam construction under the condition of underwater complex geology.

In addition, in the embodiment, the utility model provides a pair of no end steel pouring jacket cofferdam suitable for complicated geological conditions under water transfers at the steel pouring jacket case and accomplishes the back, pours the back cover concrete according to the design requirement, and the back cover concrete can play fine prevention infiltration effect.

Finally, in this embodiment, each steel box forms a cavity structure, and then a cavity structure, and the cofferdam structure that forms has two-layer structure at least, and then can form double-deck cofferdam, and the platform of assembling temporarily can be regarded as the assembly workstation of wallboard for its realization is assembled, then transfers etc. to the design position through hanging, then through concrete placement etc. forms cofferdam structure.

Example 2

In this embodiment, the assembly of the steel jacket box is mainly described.

Referring to fig. 4, a plurality of gear-shaped structures 110 are disposed at the bottom of the steel jacket box 100 along the circumferential direction of the steel jacket box 100, and the plurality of gear-shaped structures form an insertion portion of the cofferdam structure.

In this embodiment, compare in other structures, the gear form has certain sharp portion, and the simultaneous production and processing is easy, and then can transfer the back at the steel bushing box, disect insertion riverbed, and then it is little to sink the construction interference, and the back cover concrete is direct and riverbed contact, and the vertical atress of pouring jacket is little, and wallboard reuse rate is high, and economic nature is good, and the construction degree of difficulty is less relatively.

In particular, with reference to fig. 3, the panel 1 comprises a panel 1-1 and a frame structure arranged inside the panel 1-1, the panel 1-1 forming a protective layer of the frame structure.

In this embodiment, specifically, the pouring jacket panel divide into outer pouring jacket panel and inlayer pouring jacket panel, and outer pouring jacket panel plays supporting role, and the inlayer pouring jacket panel is vertical through the tooth's socket joggle, and joint department installation rubber gasket is full weld simultaneously, can play fine water-proof effects.

In actual construction, a plurality of wall plates 1 are assembled to form a steel sleeve box with an upper opening and a lower opening, adjacent wall plates 1 are spliced by connecting members 1-4 between the wall plates, and rubber water-insulating strips are arranged at the splicing positions. By placing the rubber water-proof strip, the sealing performance can be ensured.

Referring to the attached drawings, each framework structure comprises a plurality of longitudinal rib plates 1-3 and transverse rib plates 1-2 perpendicular to the longitudinal rib plates 1-3, the longitudinal rib plates 1-3 are I-shaped beams, and the transverse rib plates 1-2 formed by the channel steel structures are arranged on the upper side and the lower side of the I-shaped beams.

In this embodiment, the cooperation of I-beam and channel-section steel structure is used for the intensity of wallboard can increase, compares in simple plate structure, I-beam and channel-section steel structure, makes whole wallboard have certain thickness, can bear certain pressure etc. and the bearing capacity is stronger.

In order to ensure the strength, referring to fig. 4-5, the pile foundation steel casing 2-1 is provided with a plurality of steel corbels 2-2 between the temporary splicing platform 2 and the pile foundation steel casing 2-1, and the steel corbels 2-2 form a triangular support frame for supporting the temporary splicing platform 2.

Referring to fig. 2, 6 or 10, in this embodiment, there are a plurality of temporary assembling platforms 2, and after the plurality of temporary assembling platforms 2 are connected, an inner ring structure located inside the cofferdam structure is formed. In this embodiment, through forming the inner circle structure, and then in the outside of inner circle, assemble and transfer of every steel pouring jacket alone, finally in order to realize whole structure.

Referring to the attached drawings, the temporary splicing platform further comprises a steel corbel 2-2 located between the temporary splicing platform and the existing pile foundation, and the steel corbel 2-2 forms a triangular supporting frame used for supporting the temporary splicing platform 2.

In this embodiment, the increase of steel corbel for pile foundation steel protects a section of thick bamboo and assembles the platform temporarily and can be connected, and then forms integrative structure, when steel bushing case atress inwards or when moving outward, can be close to and assemble the platform temporarily, and then can realize supporting under the effect of steel corbel etc..

Further, referring to fig. 5, the steel casing box comprises guard rails 2-3, wherein the guard rails 2-3 are arranged on the outer side of the steel casing box 100, and cross beams at the bottoms of the guard rails 2-3 penetrate through the steel casing box 100 to be connected with the steel corbels 2-2.

In this embodiment, the guard rail forms external protection, and through being connected with the steel bushing box, the increase of protection intensity is realized.

Furthermore, the internal support mechanism 4 is provided with a plurality of support frames, the support frames below the bearing platform concrete are firstly removed by taking the bearing platform concrete as a reference, and then the support layers above the bearing platform concrete are gradually removed from top to bottom.

Example 3

In this embodiment, how to perform lowering and the like will be mainly described.

Referring to the attached drawings 6-8, the steel sleeve box further comprises a hanging and lowering mechanism 3, wherein the hanging and lowering mechanism 3 penetrates through the supporting frame and lifts the hanging points 3-8 to achieve the lowering of the steel sleeve box.

In this embodiment, hang and transfer the mechanism and pass inside support frame, and then can use the support of inside support frame, improve whole safety of hanging etc..

Referring to the attached drawing 8, the hanging and lowering mechanism 3 comprises a power unit 3-1, and the power unit 3-1 takes the support frame as a base to drive the deformed steel bar 3-3 connected with the suspension point 3-8 to realize lifting movement so as to lower the steel sleeve box.

Furthermore, the power unit 3-1 is a jack, a first beam body 3-6 and a second beam body 3-7 are respectively arranged above and below the jack, a cushion block 3-5 is arranged above the first beam body 3-6 through a nut, and the jack is arranged on the support frame through a supporting foot 3-2.

In this embodiment, through the increase of cushion etc. can make whole hanging transfer the mechanism and can support and install, ensured the safety problem of whole steel bushing box transfer etc. in-process.

Further, the temporary assembling platform further comprises a limiting mechanism 6 positioned between the steel pouring jacket 100 and the temporary assembling platform 2, and the limiting mechanism 6 adjusts the height position according to the assembling position change of the steel pouring jacket 100. In this embodiment, stop gear 6 makes the assembly of whole interim assembly platform 2 and steel bushing box 100 more nimble, and application range is wider.

Further, in order to adjust the position of the steel jacket box or the limiting mechanism 6, the limiting mechanism 6 and the inner wall of the steel jacket box 100 directly form a gap of 2-6 cm.

And the hanging points 3-8 are connected with a hanging and lowering mechanism 3 through deformed steel bars 3-3, and the assembled steel sleeve box is fixed through the deformed steel bars and the lowering so as to realize construction.

Example 4

In the present embodiment, a specific structure is mainly described.

Referring to the attached drawings 1-10, the bottomless steel pouring jacket cofferdam applicable to underwater complex geological conditions mainly comprises a steel pouring jacket 1, a temporary splicing platform 2, a hanging and lowering mechanism 3, an internal supporting mechanism 4, a guiding system 5, a limiting system 6 and bottom sealing concrete 7. In the specific embodiment, the underwater geological condition is complex, the bottom of the casing box needs to invade into a pebble bed and a limestone bed, and the traditional steel casing box cofferdam cannot be realized, so that the bottomless steel casing box cofferdam applicable to the underwater complex geological condition is adopted. The inner contour plane dimension of the steel sleeve box wall plate 1-1 is 16.2m multiplied by 9.5m, the same as the inner contour dimension of the bearing platform, and the height is 8 m. The steel sleeve box wall plate 1-1 is formed by combining I32a I-steel vertical ribs, 16# channel steel transverse ribs and 8mm steel. The internal supporting mechanism 4 is divided into an upper layer, a middle layer and a lower layer, and is formed by enclosing purlins and an internal supporting structure. The hanging system adopts a pile foundation steel pile casing as an existing pile foundation 2-1, a power unit 3-1 formed by downward section steel and a jack is arranged on the pile foundation steel pile casing, and a steel sleeve box is downward arranged by a finish rolling deformed steel bar 3-3 suspender with the diameter of 32mm and a hydraulic jack. The descending guide system 5 utilizes a welded steel structure on the steel casing 2-1 as plane and vertical control when the steel hanging box is descended. The steel sleeve box bottom sealing concrete 7 is marked as C30, the casting thickness is 1.2m, and the one-step casting is carried out by adopting a guide pipe method.

The wall plate 1 of the steel pouring jacket mainly comprises a pouring jacket panel 1-1, transverse rib plates 1-2, longitudinal rib plates 1-3 and connecting members 1-4, wherein the pouring jacket panel is divided into an outer layer pouring jacket panel and an inner layer pouring jacket panel, the outer layer pouring jacket panel plays a supporting role, the inner layer pouring jacket panel is vertically joggled through a tooth socket, and a joint is provided with a rubber gasket and is fully welded. All adopt the steel plate with the thickness of 8 mm. The transverse rib plates 1-2 are made of 16# channel steel and are arranged at a distance of 50cm, and the longitudinal rib plates 1-3 are made of I32a I-shaped steel and are arranged at a distance of 80-90 cm. The steel pouring jacket wallboard 1 is only vertically partitioned, and the width of each partition is 4.75-5.5 m. Each wallboard unit connecting member 1-4 adopts 16mm thick, wide 160mm band steel, connects through M22 bolted connection, places rubber water stop strip in the wallboard unit piece seam and stops the water. The bottom of the steel sleeve box wall plate 1 is in a gear shape, and the tooth space is 10 cm.

When the temporary assembling platform 2 is constructed, a double-assembling I32a type I steel bracket 2-2 with the length of 1.2m is welded at the position 50cm above the water surface of a pile foundation steel casing 2-1 along the outer side of the longitudinal axis and the transverse axis of the pile foundation steel casing 2-2, a sleeve box wall plate limiting block is welded on the bracket, 2I 12 type I steel beams and a woodworking plate are laid, the outer edge of the temporary assembling platform 2 is provided with a protective fence made of steel pipes with the diameter of 48mm and is hung with a dense mesh net, the steel sleeve box temporary assembling platform 2 is formed jointly, the protective fence 2-3 comprises an upper cross rod, a middle cross rod and a lower cross rod, the upper cross rod is 1.2m away from the platform surface, the distance between each cross rod is 0.3m, and the distance between the vertical rods is 1 m. During construction, the temporary splicing platform 2 adjusts the elevation of the bracket according to the actual water level condition.

The hanging and lower system comprises a first beam body 3-6, a second beam body 3-7, 6 75t jacks, an oil pump, phi 32 finish-rolled deformed steel bars 3-3, nuts 3-4, cushion blocks 3-5, supporting feet 3-2 of the jacks and the like which are arranged at the top of the casing, wherein 6 suspension points 3-8 are arranged on a single steel sleeve box, the steel sleeve box is connected with the hanging and lower system by the finish-rolled deformed steel bars 3-3 after the steel sleeve box is assembled, and the steel sleeve box is placed down.

In this embodiment, stop gear 6 divide into first floor spacing system and second floor spacing system, and first floor spacing system is located interim assembly platform 2, adopts I12 channel-section steel as limit stop, and the spacing system in second floor adopts I12a I-steel to weld in pile foundation steel protects a section of thick bamboo 2-1 and indulges the transverse axis outside, 2m, 6m departments apart from interim assembly platform 2 top surface respectively, and the 5cm space is left with the steel boxbox inner wall in the unloading of I-steel actual measurement.

The steel pouring jacket is provided with 3 layers of internal supporting mechanisms 4, the distance from the 1 st layer to the top of the steel pouring jacket is 0.5m, the distance from the 2 nd layer to the top of the steel pouring jacket is 2m, and the distance from the 3 rd layer to the bottom of the steel pouring jacket is 2 m; the inner supporting mechanism 4 is made of double-spliced I45a I-shaped steel, four corners overlapped by the inner supporting mechanism 4 are reinforced by triangular stiffening plates 4-1 with the side length of 30cm, and after steel sleeve boxes are spliced, the inner support is constructed from bottom to top. And after the strength of the bottom sealing concrete 7 reaches 90% of the designed strength, pumping water to remove the 3 rd inner support system 4, and gradually removing the 1 st and 2 nd inner support systems 4 from top to bottom after the construction of the bearing platform concrete is completed.

The beneficial effects of this embodiment are as follows:

(1) the utility model provides a novel cofferdam form, traditional steel pouring jacket cofferdam receive the restriction of the geological conditions under the water, easily appear unable normal transfer and the serious problem of infiltration, the utility model discloses a bottomless steel pouring jacket cofferdam cancellation steel bushing bottom plate of the case, easily steel bushing box is transferred, is applicable to complicated geological conditions under water, to special geological conditions under water, still can adopt to strike and bore, machinery chisels out, means such as blasting under water. The utility model discloses no end cofferdam structural suitability is strong, has good engineering value.

(2) The utility model discloses simple structure, the atress is clear and definite, under the operating mode that draws water, the intensity of cofferdam structure, rigidity, stability homoenergetic satisfy the operation requirement, and structural performance is superior, and the bearing capacity does, safe and reliable.

The utility model provides a pair of no end steel pouring jacket cofferdam suitable for complicated geological conditions has removed the bottom plate system and has regarded steel bushing box wall plate bottom as the gear form, does benefit to the steel pouring jacket and sinks, and steel pouring jacket wallboard can disect insertion riverbed to through transferring device to design elevation, pour the back cover concrete after, make the steel pouring jacket and the riverbed of embedding riverbed, constitute confined interim water proof structure jointly. The cofferdam construction method has the advantages of ingenious structure technology, high construction precision and convenience in sinking, and is suitable for cofferdam construction under the condition of underwater complex geology.

(3) The utility model discloses having removed the bottom plate system and having adopted the construction of low pile cap, can having accomplished the bored pile construction in step, utilize drilling work platform and steel to protect a section of thick bamboo and provide the operation platform for the construction of bottomless steel bushing box, practiced thrift field work volume greatly, the efficiency of construction is high, and the construction speed is fast.

(4) The utility model discloses simple structure, the construction of sinking is disturbed for a short time, and the back cover concrete is direct and the riverbed contact, and the vertical atress of pouring jacket is little, and wallboard reuse rate is high, and economic nature is good, and the construction degree of difficulty is less relatively.

The pouring jacket panel divide into outer pouring jacket panel and inlayer pouring jacket panel, and outer pouring jacket panel plays supporting role, and the inlayer pouring jacket panel is vertical through the tooth's socket joggle, and the joint department installation rubber gasket is full weld simultaneously, can play fine water-proof effects.

The utility model discloses in, the work progress of whole cofferdam structure as follows:

s1, excavating a riverbed at the bottom of a bearing platform by means of percussion drilling, mechanical chiseling and underwater blasting;

s2, after the river bed bottom is excavated, the external protective cylinder capable of being pulled out is completely pulled out by the crawler crane, and the steel sleeve box temporary assembling platform 2 is welded on the pile foundation steel protective cylinder. Arranging guard rails, wherein the guard rails 2-3 are composed of an upper cross bar, a middle cross bar and a lower cross bar, the distance between the upper cross bar and the platform surface is 1.2m, the distance between each cross bar is 0.3m, and the distance between the vertical rods is not more than 2 m; during construction, the construction is carried out under the conditions that the water level is low and the change is stable.

And S3, positioning, guiding and internal supporting mechanisms 4. The central axis of the set steel cofferdam is used as a reference, the inner contour position line of the steel casing box is discharged on the temporary assembling platform 2, 16# channel steel is welded on the bracket of the assembling platform as a bottom limit stop block according to lofting and the verticality measuring result of the steel casing, and the position of the bottom limit stop block is rechecked after welding is completed. Marking the positions of the steel casing cylinders 2-1 at the positions 2m and 6m away from the top surface of the assembling platform, determining the welding position of the assembling bracket of the 2 nd and 3 rd layer internal supporting mechanisms 4, and installing the 2 nd and 3 rd layer internal supporting mechanisms 4 of the steel sleeve box on the assembling bracket. The steel bushing box wall plates are positioned and assembled by taking the layer 2 and layer 3 internal supporting mechanisms 4 and the assembling platform limit stop blocks as guides, and when the steel bushing box is placed down, the bracket is cut off from the welding position of the steel casing and is used as a limiting device for placing the steel bushing box down.

And S4, assembling the steel sleeve box. And (3) assembling the steel pouring jacket wallboard by taking the internal supporting mechanism 4 of the layer 2 and the temporary assembling platform 2 limiting stopper as a guide, wherein the wallboard is hoisted block by adopting a crawler crane. Before hoisting, the blocking position lines of the side plates are firstly thrown onto the assembly platform and marked by ink lines. After the single wall plate is positioned, the inclination of the side plate and the perpendicularity of the end are checked, the wall plate 1 of the steel sleeve box is fixed and position-adjusted by using a chain block and limiting I-steel welded on a steel casing according to the field condition, accurate positioning and tight abutted seam of each unit of the steel sleeve box are ensured, after the adjacent units are hoisted, high-strength bolts are adopted for connection in time, and a rubber water stop belt is arranged at the abutted seam.

And S5, arranging the steel sleeve below the steel sleeve box. After the temporary assembling platform is assembled, the steel bushing box is erected on the top of the steel casing and is placed down. Before the lowering system is installed, a second beam body 3-7 installation notch formed by a double-spliced I45a I-steel lower carrying pole beam is cut at the top of the protective cylinder, stiffening steel plates are welded on the inner side and the outer side of the steel protective cylinder at the bottom of the notch, and the bottom of the notch is ensured to be on the same horizontal plane when the notch is cut. The supporting feet of the jack 3-1 are processed and manufactured by steel plates and I-shaped steel on site, the upper surface and the lower surface of the jack are horizontal, a round hole is formed in the center of the jack, the jack is hollow, a stiffening rib plate is vertically arranged, and the jack is placed on the lower portion of the jack. After a jack 3-1, an oil pump, a jack supporting foot 3-2, a first beam body 3-6 formed by an upper shoulder pole beam and a second beam body 3-7 formed by a lower shoulder pole beam are placed in place, a lowering system is connected with a steel sleeve box by adopting deformed steel bar 3-3 with the diameter of 32mm and a nut 3-4 which are finish-rolled, and the steel sleeve box lowering system is formed jointly. The main top piston of the jack 3-1 moves upwards, the top cross beam nut is locked when the piston is in place, the main top piston continues to move upwards for 3cm, the bottom cross beam nut is opened, the main top piston retracts downwards, the steel jacket box is lowered, and after the main top piston retracts in place, the bottom cross beam nut locks the deformed steel again, and a lowering cycle is completed. Marking on the deformed steel 3-3 in the lowering process, taking a 20cm interval as a cycle, and lowering the steel bushing box to a preset position through the action of cyclic reciprocation.

And S6, pouring the bottom sealing concrete 7. And after the steel sleeve box is put down in place, rechecking the plane position and the elevation of the steel sleeve box again. After the water flow is correct, sand bags and stones are adopted to plug gaps along the inner and outer contours of the wall plate of the casing, so that the water flow impact at the bottom is reduced. And after the gap is blocked, pouring construction of bottom sealing concrete 7 is carried out, wherein the bottom sealing concrete is constructed by adopting a conduit method. The bottom sealing concrete 7 is C30 underwater concrete, and is symmetrically constructed along the diagonal by adopting 2 guide pipes. Concrete pouring follows the sequence from the corners to the center, the corner parts are preferably ensured to be full when distributing, and the pouring is carried out according to bin division, symmetry and constant speed, and the sealing is carried out from the periphery of the bottom plate to the center.

And S7, after the bottom sealing concrete 7 reaches the design strength of 90%, dismantling the steel sleeve box and lowering the system, accurately conveying the materials to a stacking site for storage, and bearing the buoyancy load by the friction force between the bottom sealing concrete 7 and the steel sleeve box and the bond force between the bottom sealing concrete 7 and the steel casing. And manual dredging is adopted in the cofferdam, and the sludge is collected into the bucket by a shovel and lifted out by a crane. Pumping water and dredging to the top surface of the bottom sealing concrete, gradually cutting off the steel pile casing in sections, and cleaning sludge in the steel pile casing until the sludge on the pile foundation, the bottom sealing concrete and the steel casing box wall plate 1 is completely cleaned.

S8, in order to prevent the corrosion of the steel pile casing from affecting the concrete quality of the bearing platform, the steel pile casing invading the bearing platform part must be completely cut off. And after the steel casing is cut off, manually chiseling off the pile head by using an air pick, cleaning, flattening and reserving image data, wherein the pile body extends into a bearing platform by 20 cm. After the pile head is chiseled, the waste concrete and sundries in the sleeve box are cleaned, and a third party detection unit is timely informed to carry out ultrasonic detection on the pile foundation.

And S9, constructing a bearing platform steel bar and a cooling water pipe. The bearing platform steel bars are processed and manufactured in a centralized manner in a steel bar processing factory, the processed shapes and sizes of the steel bars need to meet the design and specification requirements, and the complicated detailed sizes need to be subjected to enlarging sample manufacturing. And binding the cooling water pipe on the reinforcing steel bars of the bearing platform according to design requirements while binding the reinforcing steel bars of the bearing platform. And after the cooling pipe is used, grouting and sealing holes in time, and cutting off the part extending out of the top surface of the bearing platform.

And S10, pouring concrete of the bearing platform in water and maintaining. Symmetrically distributing the materials from the transverse bridge direction of the underwater bearing platform, pouring in layers, wherein the thickness of each layer is 30cm, the thickness of the whole large surface layer of concrete needs to be uniform, the height difference is not more than 15cm, and vibrating is immediately carried out after the concrete is placed into a mold and reaches the height of each layer so as to avoid leakage vibration. The newly poured concrete surface exposed in the atmosphere is required to be timely watered and maintained, the upper surface of the concrete of the bearing platform is not protected by a steel sleeve box, the watering frequency is required to be timely adjusted according to the air temperature and the concrete pouring time of the bearing platform, and the geotextile is required to be kept in a wet state all the time in the maintenance period.

S11, dismantling the steel sleeve box. After the construction of the bearing platform is completed, the Larsen steel sheet pile is pulled out by adopting a vibration hammer, and after the pier stud is discharged, the steel boxed cofferdam can be dismantled. The dismantling sequence is that the inner support system 4 is dismantled first, and the wall plate is dismantled finally.

It is noted that, herein, relational terms such as first and second (a, b, etc.) and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. A bottomless steel boxed cofferdam applicable to underwater complex geological conditions is characterized by comprising,

the steel sleeve boxes are connected after being lowered down to form a cofferdam structure with an insertion part at the bottom;

each steel jacket box is formed by detachably assembling a plurality of wall plates, and the wall plates form a cavity structure after being assembled;

the temporary assembling platform is built through an existing pile foundation;

the limiting mechanism is positioned on the temporary assembling platform and forms a limiting space, and the steel sleeve box is assembled in the limiting space;

and a plurality of suspension points are arranged along the circumferential direction of the steel sleeve box, and the assembled steel sleeve box is lowered through the suspension points to form the cofferdam structure.

2. The bottomless steel boxed cofferdam applicable to underwater complex geological conditions according to claim 1, characterized in that a plurality of gear-like structures are arranged at the bottom of the steel boxed cofferdam along the circumferential direction of the steel boxed cofferdam, and the plurality of gear-like structures form the insertion part of the cofferdam structure.

3. The bottomless steel boxed cofferdam for underwater complex geological conditions according to claim 1, characterized in that said panels comprise panels forming a protective layer of the frame structure and the frame structure arranged inside the panels.

4. The bottomless steel boxed cofferdam applicable to underwater complex geological conditions as recited in claim 3, characterized in that each frame structure comprises a plurality of longitudinal rib plates and transverse rib plates perpendicular to the longitudinal rib plates, the longitudinal rib plates are I-beams, and the transverse rib plates formed by the channel steel structures are arranged on the upper and lower sides of the I-beams.

5. The bottomless steel boxed cofferdam applicable to underwater complex geological conditions as recited in claim 1, wherein the number of the temporary splicing platforms is several, and after the several temporary splicing platforms are connected, an inner ring structure positioned at the inner side of the cofferdam structure is formed.

6. The bottomless steel boxed cofferdam applicable to underwater complex geological conditions is characterized by further comprising steel corbels positioned between the temporary assembling platform and the existing pile foundations, wherein the steel corbels form a triangular support frame for supporting the temporary assembling platform.

7. The bottomless steel boxed cofferdam applicable to underwater complex geological conditions as recited in claim 6, further comprising a guard rail, wherein the guard rail is arranged at the outer side of the steel boxed cofferdam, and a cross beam at the bottom of the guard rail penetrates through the steel boxed cofferdam to be connected with the steel bracket.

8. The bottomless steel boxed cofferdam applicable to underwater complex geological conditions as recited in claim 6, further comprising a hanging and lowering mechanism, wherein the hanging and lowering mechanism penetrates through the supporting frame and lifts the hanging point to realize the lowering of the steel boxed cofferdam.

9. The bottomless steel boxed cofferdam applicable to underwater complex geological conditions as recited in claim 8, characterized in that the hanging and lowering mechanism comprises a power unit, the power unit takes the support frame as a base to drive the deformed steel bar connected with the suspension point to realize lifting movement, so as to realize lowering of the steel boxed cofferdam.

10. The bottomless steel boxed cofferdam applicable to underwater complex geological conditions as claimed in claim 9, wherein the power unit is a jack, a first beam body and a second beam body are respectively arranged above and below the jack, a cushion block is arranged above the first beam body through a nut, and the jack is arranged on the support frame through a supporting leg.

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