Integrated construction process of wading bridge cofferdam

Abstract

The application provides a wading bridge cofferdam integrated construction process and belongs to the field of building construction.The technical scheme is as follows: S1, erecting a construction road; S2, using the road to insert and drive a lock steel pipe pile cofferdam, a Larsen IV steel sheet pile cofferdam, a water pipe culvert cofferdam, and erecting a construction platform, inserting and driving a Larsen VI steel sheet pile cofferdam to form a slurry pool; S3, erecting a water convenient bridge; S4, on the construction platform, carrying out bridge pile foundation construction, drilling and piling; S5, backfilling a foundation pit and removing the lock steel pipe pile cofferdam; S6, in other bridge construction stages, removing the construction platform and the water pipe culvert after the completion of the bridge upper bent cap construction, leaving a staggered lane; S7, removing the construction road, using an excavator to return the silt on the upper part of the opposite pull support to the river channel, and removing the opposite pull support.The application has the beneficial effects that the foundation pit, the construction platform, the road and the slurry pool are in close contact and exchange with the river channel through the steel cofferdam, and the pollution to the river channel in the construction process is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of building construction, and in particular to a cofferdam integrated construction process for a bridge over water. BACKGROUND

[0002] With the continuous improvement of bridge construction level in China, the proportion of river-crossing bridges is gradually increasing, and most of the pile caps of water bridges need to be constructed with the aid of steel cofferdams. The cofferdam refers to a temporary enclosure structure built for the construction of permanent water conservancy facilities. Its function is to prevent water and soil from entering the construction site of the building, so as to drain water, excavate the foundation pit, and build the building in the cofferdam.

[0003] Generally, it is mainly used in hydraulic structures, and in addition to being part of the formal building, the cofferdam is generally removed after use. The cofferdam is higher than the highest water level that may occur during the construction period. At present, the existing cofferdam construction process is complex, inconvenient to install and remove, and cannot be used twice, causing resource waste, and polluting the river water, which cannot meet the green environmental protection requirements. SUMMARY

[0004] The purpose of the present application is to provide a cofferdam integrated construction process for a bridge over water, which closely contacts and exchanges the foundation pit, construction platform, access road and mud pool with the river, and avoids pollution of the river during construction.

[0005] The present application is achieved by the following measures:

[0006] A cofferdam integrated construction process for a bridge over water, characterized in that the construction process comprises the following steps:

[0007] S1, erecting a construction access road, inserting and driving the access road by a ship or a water excavator, and using sand blowing to build an island, using a pump to pump out the river mud and fill the access road, setting a 20mm fine rolled thread steel counter-pulling support 0.5m above the river water level, setting a plane according to the calculation without using other fillers, reducing the cost and pollution;

[0008] S2, using the access road to insert and drive a lock buckle steel pipe pile cofferdam, a Larsen IV steel sheet pile cofferdam, and a water pipe culvert cofferdam, and erecting a construction platform, inserting and driving a Larsen VI steel sheet pile cofferdam to form a mud pool;

[0009] S3, erecting a water access bridge;

[0010] S4. On the construction platform, the bridge pile foundation is constructed by drilling piles and excavating the foundation pit. Two internal supports are used. The first internal support uses 609*12mm bracing and corner bracing. The walers are made of double 700*300 H-beams. The second internal support uses pressure bearings. The pier cap and bridge piers are constructed, and the mud pit is removed. After drilling is completed, mud is transported by sewage pump and clean water is replaced at the same time. After the water quality meets the standards, the mud pit cofferdam is removed.

[0011] S5. Backfill the foundation pit and dismantle the locking steel pipe pile cofferdam;

[0012] S6. During other construction phases of the bridge, after the construction of the superstructure of the bridge is completed, the construction platform and the water culvert will be removed, leaving the passing lane.

[0013] S7. Demolish the construction access road and use an excavator to return the silt above the tie rod to the river channel; dismantle the tie rod and use a silt pump to extract the lower layer of silt, return the silt to the water, and restore the landform.

[0014] The invention also has the following specific features:

[0015] The temporary bridge over the water comprises several steel pipe piles, on which Bailey bridges are installed, and on which bridge decks are installed.

[0016] The bridge deck is equipped with temporary bridge railings.

[0017] Preferably, in water depths of 0-3m, membrane bag cofferdams can be used instead of filler material, with on-site river sand.

[0018] Preferably, the interlocking steel pipe pile cofferdam is a cofferdam for bridge foundation construction; the Larssen IV steel sheet pile is a cofferdam for construction access roads, mud pits, and passing lanes; the Larssen VI steel sheet pile is a cofferdam for the construction platform; the mud pit is used during the pile formation process of bored cast-in-place piles, where an impact device or winch lifts the drill bit to impact and form a hole. The drilling cuttings are suspended by the mud, ensuring that the drill bit impacts the new soil layer at the bottom of the hole each time. The mud pit and the borehole form a liquid circulation system; the construction platform is the space for bridge pile foundation construction; the access road is for transportation during bridge construction; the temporary bridge over water is a passage connecting the foundation construction of other bridges in the water; the culvert cofferdam is the support space for the culvert; the tie rod is the support for the access road cofferdam; the steel pipe pile is the main load-bearing component of the temporary bridge; the Bailey bridge is the load-bearing beam of the temporary bridge; the temporary bridge railing is to ensure the safety of people and vehicles and prevent falls or collisions; and the bridge deck is the driving lane deck of the temporary bridge.

[0019] The beneficial effects of this invention are: by using a steel cofferdam to ensure close contact and exchange between the foundation pit, construction platform, access road and mud pit and the river, pollution of the river during construction is avoided. Attached Figure Description

[0020] Fig. 1 Structure diagram of the embodiment of the present application.

[0021] Fig. 2 Structure diagram of the water bridge of the embodiment of the present application.

[0022] Fig. 3 Structure diagram of the water bridge of the embodiment of the present application.

[0023] Wherein, the reference signs are: 1, lock steel pipe pile cofferdam; 2, Larsen IV steel sheet pile cofferdam; 3, Larsen VI steel sheet pile cofferdam; 4, slurry pool; 5, construction platform; 7, water bridge; 8, water pipe culvert cofferdam; 9, counter-bracing; 10, steel pipe pile; 11, Bailey frame; 12, bridge guardrail; 13, bridge deck. DETAILED DESCRIPTION

[0024] In order to clearly illustrate the technical features of the present application, the present application will be described in detail below through specific embodiments.

[0025] Reference Figs. 1-3 , a water bridge cofferdam integrated construction process, the construction process comprises the following steps:

[0026] S1, erecting a construction road, inserting and driving the road by a ship or a water excavator, and building an island by blowing sand, using a pump to pump out the silt in the river to fill the road, setting a 20mm fine rolled thread steel counter-bracing 9 above the river water level by 0.5m, setting a plane according to the calculation, without using other fillers, reducing the cost and pollution;

[0027] S2, inserting and driving the lock steel pipe pile 10 cofferdam 1, Larsen IV steel sheet pile cofferdam 2, water pipe culvert cofferdam 8, and erecting a construction platform 5, and inserting and driving the Larsen VI steel sheet pile cofferdam 3 to form a slurry pool 4;

[0028] S3, erecting a water bridge 7;

[0029] S4, on the construction platform 5, bridge pile foundation construction, drilling pile, excavating foundation pit, adopting two-way internal support form, the first way internal support adopts 609*12mm counter-bracing and angle support, the surrounding purlin adopts double-spliced 700*300 H-shaped steel, the second way internal support adopts pressure support form, constructing pile cap and bridge pier column, and removing the slurry pool 4, after the drilling is completed, the slurry is transported by a sewage pump, and the clean water is replaced, and the slurry pool 4 cofferdam is removed after the water quality reaches the standard;

[0030] S5, backfilling the foundation pit and removing the lock steel pipe pile 10 cofferdam 1;

[0031] S6, bridge other construction stage, removing the construction platform 5 and the water pipe culvert after the bridge upper bent cap construction is completed, leaving the wrong lane;

[0032] S7, remove the construction road, the upper part of the sand on the pull support 9 is returned to the river channel by excavator; remove the pull support 9, and the lower layer of sand is pumped out by the sand pump and returned to the water to restore the topography.

[0033] The water bridge 7 comprises a plurality of steel pipe piles 10, a plurality of steel pipe piles 10 are provided with a Bailey frame 11, and the Bailey frame 11 is provided with a bridge deck 13.

[0034] The bridge deck 13 is provided with a bridge guardrail 12.

[0035] Preferably, the membrane bag cofferdam can be used instead of the filler in the water depth of 0-3m.

[0036] Preferably, the lock steel pipe pile 10 cofferdam 1 is a cofferdam for bridge foundation construction, the Larsen IV steel sheet pile is a cofferdam for construction road, mud pool 4 and passing lane, the Larsen VI steel sheet pile is a cofferdam for construction platform 5, the mud pool 4 is used for lifting the drill bit by the impact device or winch during the pile forming process of the cast-in-place pile, and the drill bit is impacted to form a hole. The drill slurry is suspended in the mud, so that the drill bit can impact the new soil layer at the bottom of the hole each time. The mud pool 4 and the drill hole form a liquid circulation system, the construction platform 5 is a space for bridge pile foundation construction, the road is a transportation in the process of bridge construction, the water bridge 7 is a channel for connecting other bridge foundation construction in water, the water pipe culvert cofferdam 8 is a supporting space for the water pipe culvert, the pull support 9 is a support for the cofferdam of the road, the steel pipe pile 10 is a main force component of the bridge, the Bailey frame 11 is a force beam of the bridge, the bridge guardrail 12 is used to ensure the safety of people and vehicles, prevent falling or collision, and the bridge deck 13 is a driving lane of the bridge.

[0037] The technical features not described in the application can be realized by or using the prior art, and will not be repeated here. Of course, the above description is not a limitation of the application, and the application is not limited to the above examples. Changes, modifications, additions or replacements made by ordinary skilled in the art within the scope of the application should also be within the protection scope of the application.

Claims

1. A construction process for integrating a wading bridge cofferdam, characterized in that, The construction process includes the following steps: S1. Construct a temporary access road. Use boats or water excavators to drive the access road and use sand blowing to build islands. Use pumps to pump out the silt from the river channel to fill the access road. Set 20mm precision rolled threaded steel tie supports 0.5m above the river water level. S2. Use the access road to drive interlocking steel pipe pile cofferdam, Larssen IV steel sheet pile cofferdam, and water passage culvert cofferdam, and build a construction platform to drive Larssen VI steel sheet pile cofferdam to form a mud pool. S3. Construct a temporary bridge over the water; S4. On the construction platform, the bridge pile foundation is constructed by drilling piles and excavating the foundation pit. Two internal supports are used. The first internal support uses 609*12mm bracing and corner bracing. The walers are made of double 700*300 H-beams. The second internal support uses pressure bearings. The pier cap and bridge piers are constructed, and the mud pit is removed. After drilling is completed, mud is transported by sewage pump and clean water is replaced at the same time. After the water quality meets the standards, the mud pit cofferdam is removed. S5. Backfill the foundation pit and dismantle the locking steel pipe pile cofferdam; S6. During other construction phases of the bridge, after the construction of the bridge superstructure is completed, the construction platform and water culvert will be removed, leaving a passing lane. S7. Demolish the construction access road and use an excavator to return the silt above the tie rod to the river channel; dismantle the tie rod and use a silt pump to extract the lower layer of silt, return the silt to the water, and restore the landform. The temporary bridge over the water includes a number of steel pipe piles, on which Bailey bridges are installed, and on which bridge decks are installed. The bridge deck is equipped with temporary bridge railings.

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