A cofferdam construction method for shortening construction period

Abstract

The application discloses a cofferdam method capable of shortening construction period, relates to the technical field of bridge construction, and comprises the following steps: S1, riverbed cleaning and foundation pile construction; S2, steel cofferdam construction; S3, preparation work for installation; S4, cofferdam installation; and S5, reinstallation. The cofferdam method capable of shortening construction period shortens the waiting time for steel cofferdam construction by simultaneously performing the riverbed cleaning, the steel pipe pile construction and the steel cofferdam construction, realizes the modularized steel cofferdam construction in a factory, realizes the assembly at a wharf, reduces the transportation difficulty, facilitates the timely replacement of damaged parts, and realizes the accurate adjustment of the cofferdam installation by utilizing the unique concrete pouring mode and the water injection of a circulating pump. The cofferdam installation method not only shortens the construction period of the cofferdam, reduces the construction cost, but also improves the installation accuracy and guarantees the installation quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building bridge construction, in particular to a cofferdam construction method for shortening construction period. BACKGROUND

[0002] In the field of building engineering technology, underwater operation is often involved. Because of the high risk and difficulty of underwater construction, in order to reduce underwater operation, the cofferdam method is often used to convert the underwater construction to dry operation conditions, and then the cofferdam is removed.

[0003] The existing cofferdam method is time-consuming and laborious, and is accompanied by danger, which makes it difficult for workers to construct, and it is not easy to adjust the balance of the cofferdam during installation, resulting in that the cofferdam construction is difficult to meet the standards. Therefore, we propose a cofferdam construction method for shortening construction period. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a cofferdam construction method for shortening construction period, which solves the problems raised in the background art.

[0005] To achieve the above purpose, the present application is implemented by the following technical scheme, a cofferdam construction method for shortening construction period, comprising the following steps:

[0006] S1, cleaning of riverbed and foundation pile construction

[0007] The mud in the construction area is sucked out by the mud suction machine, and the steel pipe pile is deeply buried in the matrix form in the water bottom, and then the limiting identification piece is installed in the steel pipe pile;

[0008] S2, construction of steel cofferdam

[0009] The modular steel cofferdam is constructed in the factory, and the modular steel cofferdam is spliced and assembled at the wharf, and then the limiting sleeve matched with the limiting identification piece installed in the steel pipe pile is installed on the inner wall of the steel cofferdam, and the steel cofferdam spliced into a whole is lifted by the gantry crane, placed on the deck barge and transported to the installation area;

[0010] S3, preparation work for installation

[0011] When the deck barge is used to transport the steel cofferdam to the installation area, the riverbed under the steel pipe pile is cleaned according to the size of the steel cofferdam and is excavated 8-12m under the riverbed under the steel pipe pile, then the whole steel cofferdam is lifted and placed by the hoisting equipment, and when the steel cofferdam is stationary, the lifting work is carried out, and the steel cofferdam is lifted to the upper side of the steel pipe pile and aligned, and the installation work is completed;

[0012] S4, cofferdam installation

[0013] The hoisting equipment aligns the steel cofferdam to the matrix steel pipe pile and drops it down, so that the steel cofferdam is initially installed by gravity sinking, then concrete is cast at the edge of the steel cofferdam, and then the concrete is dried, and then the hoisting equipment is used to adjust the installation position and angle again and the hydraulic rod is used to fine-tune, so that the position is accurately connected;

[0014] S5, reinstallation

[0015] After the installation position and angle are adjusted again and fine-tuned by the hydraulic rod, the circulating pump is used to pump water into the steel cofferdam, so that the steel cofferdam is installed by gravity lifting and sinking, and the circulating pump is stopped when the steel cofferdam is 1.8-2.2m away from the water, the steel cofferdam is adjusted, then it is adjusted again when it sinks to 0.3-0.7m, and finally the circulating pump is used to pump water into the steel cofferdam to make the bottom pin in the steel cofferdam inserted into the riverbed to complete the installation of the steel cofferdam.

[0016] Further, the pre-embedded depth of the steel pipe pile during the cleaning and foundation pile construction of the riverbed in step S1 is greater than the depth of the silt on the surface of the riverbed.

[0017] Further, the construction time of the factory-built modular steel cofferdam is synchronized with the cleaning and foundation pile construction time of the riverbed during the construction of the steel cofferdam in step S2.

[0018] Further, the hoisting equipment lifts the entire steel cofferdam and stands still for 15s during the preparation work of the installation in step S3.

[0019] Further, the concrete cast at the edge of the steel cofferdam is first cast from both sides to the middle crossbar during the cofferdam installation in step S4, so as to divide the inside of the steel cofferdam into separate spaces.

[0020] Further, the adjustment of the steel cofferdam in step S5 uses a circulating pump to inject water into the separate spaces in the steel cofferdam to control the balance of the steel cofferdam, so that the installation of the steel cofferdam meets the construction requirements.

[0021] Further, the steel cofferdam comprises a bottom fence, an embedded groove, an upper fence, an inner clamping block, and a water-absorbing expansion rubber, the inner wall of the bottom fence is provided with the embedded groove, the top of the bottom fence is provided with the upper fence, the bottom inner wall of the upper fence is provided with the inner clamping block, and the outer surface of the inner clamping block is provided with the water-absorbing expansion rubber.

[0022] Further, the steel cofferdam further comprises a casting seat and a connecting clamping block, the casting seat is connected to the inner wall of the upper fence and extends downward, the bottom of the casting seat is provided with the connecting clamping block, and the lower part of the casting seat is provided with a placement block.

[0023] The application provides a cofferdam construction method capable of shortening construction period, which has the following beneficial effects: the cofferdam method capable of shortening construction period adopts the construction of the steel cofferdam while the riverbed is cleaned and the steel pipe pile is constructed, the waiting time for the construction of the steel cofferdam is shortened, the modularized steel cofferdam is constructed in a factory, the steel cofferdam is assembled at the wharf, the transportation difficulty is reduced, the damaged parts are conveniently replaced in time, the unique pouring mode of the concrete is utilized, the water injection of the circulating pump is utilized, the installation of the cofferdam is facilitated, and the accurate adjustment of the cofferdam installation is realized, the cofferdam installation method not only shortens the construction period of the cofferdam and reduces the construction cost, but also improves the installation accuracy and guarantees the installation quality.

[0024] The application provides a cofferdam construction method capable of shortening construction period, which utilizes the setting of the spliced steel cofferdam to facilitate the segmented construction of the steel cofferdam, so that the situation that the steel cofferdam needs to be recast when a part is damaged is avoided, the mutual splicing between the bottom fence and the upper fence is utilized to facilitate the assembly process at the wharf, the water-absorbing and swelling rubber is wrapped on the outer surface of the inner clamping block, the friction coefficient between the bottom fence and the upper fence is improved, the connection firmness is improved, the water-absorbing and swelling rubber is prepared from a hydrophilic component and a rubber matrix through physical blending or chemical grafting, the volume and mass of the water-absorbing and swelling rubber can be expanded by several times, so that the connection gap between the inner clamping block and the embedded groove is filled, the clamping between the pouring seat and the placement block is utilized to further improve the connection firmness, the inner part of the pouring seat needs to be filled with concrete during installation, so that the connection firmness between the bottom fence and the upper fence is improved by gravity, and the connection firmness is improved by the influence of gravity in water. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 A cofferdam method capable of shortening construction period;

[0026] Figure 2 A cofferdam construction structure schematic view of the cofferdam method capable of shortening construction period;

[0027] Figure 3 A Figure 2 An enlarged view of A in FIG. 1.

[0028] REFERENCE NUMERALS

[0029] 1, steel cofferdam; 101, bottom fence; 102, embedded groove; 103, placement block; 104, upper fence; 105, inner clamping block; 106, water-absorbing and swelling rubber; 107, pouring seat; 108, connecting clamping block. DETAILED DESCRIPTION

[0030] A cofferdam construction method capable of shortening construction period, comprising the following steps:

[0031] S1, riverbed cleaning and foundation pile construction

[0032] The silt in the construction area is sucked out by a suction dredger, and steel pipe piles are deeply buried in the water bottom in a matrix form, and then a limiting identification element is installed in the steel pipe pile, wherein the pre-buried depth of the steel pipe pile is greater than the depth of the silt on the riverbed surface;

[0033] S2, construction of a steel cofferdam

[0034] While the riverbed is cleaned and the foundation pile is constructed, the factory constructs a modular steel cofferdam, and the modular steel cofferdam is assembled at the wharf, then a limiting sleeve matched with the limiting identification element installed in the steel pipe pile is installed on the inner wall of the steel cofferdam, and the steel cofferdam assembled as a whole is lifted by a gantry crane, placed on a deck barge, and transported to the installation area;

[0035] S3, preparation for installation

[0036] When the steel cofferdam is transported to the installation area on the deck barge, the riverbed under the steel pipe pile is cleaned according to the size of the steel cofferdam and is excavated 8-12 m deep, then the entire steel cofferdam is lifted and rested for 15 s using hoisting equipment, and when the steel cofferdam is stationary, the lifting work is performed, and the steel cofferdam is lifted to be aligned above the steel pipe pile, and the installation work is completed;

[0037] S4, cofferdam installation

[0038] The hoisting equipment lowers the steel cofferdam to align with the matrix-shaped steel pipe pile, so that the steel cofferdam sinks due to gravity to complete the preliminary installation work, then concrete is poured at the edge of the steel cofferdam, the concrete is poured from both sides first and then to the middle crossbar, so as to separate the interior of the steel cofferdam into individual spaces, then the concrete is dried, and then the installation position and angle are adjusted again using hoisting equipment and fine-tuned using a hydraulic rod, so as to realize precise butt joint;

[0039] S5, defense treatment

[0040] After the installation position and angle are adjusted again using hoisting equipment and fine-tuned using a hydraulic rod, water is pumped into the interior of the steel cofferdam using a circulating pump, so that the steel cofferdam is installed by lifting and sinking, and the work of the circulating pump is stopped when the steel cofferdam is 1.8-2.2 m away from the water, so as to adjust the steel cofferdam, water is injected into the individual spaces in the interior of the steel cofferdam using the circulating pump, so as to control the balance of the steel cofferdam, so that the installation of the steel cofferdam meets the construction requirements, then the adjustment is performed again when the sinking depth is 0.3-0.7 m, so as to ensure the horizontal installation of the steel cofferdam, and finally the circulating pump works again to pump water into the interior of the steel cofferdam, so that the bottom pins in the interior of the steel cofferdam are inserted into the interior of the riverbed to complete the installation of the steel cofferdam.

[0041] Please refer to Figures 2-3The steel cofferdam 1 comprises a bottom fence 101, an embedded groove 102, a setting block 103, an upper fence 104, an inner clamping block 105 and a water-absorbing expansion rubber 106, the embedded groove 102 is arranged on the inner wall of the bottom fence 101, the upper fence 104 is arranged on the top of the bottom fence 101, the inner clamping block 105 is arranged on the inner wall of the bottom of the upper fence 104, the water-absorbing expansion rubber 106 is arranged on the outer surface of the inner clamping block 105, the steel cofferdam 1 further comprises a pouring seat 107 and a connecting clamping block 108, the pouring seat 107 is connected to the inner wall of the upper fence 104 and extends downward, the connecting clamping block 108 is arranged on the bottom of the pouring seat 107, and the setting block 103 is arranged below the pouring seat 107, and the clamping between the pouring seat 107 and the setting block 103 further improves the firmness of the connection;

[0042] Specific operations are as follows, the mutual splicing of the bottom fence 101 and the upper fence 104 facilitates the on-site assembly efficiency of the equipment, and the water-absorbing expansion rubber 106 is wrapped on the outer surface of the inner clamping block 105 in the process of mutual clamping of the bottom fence 101 and the upper fence 104, which can not only improve the friction coefficient between the bottom fence 101 and the upper fence 104 and further improve the firmness of the connection, but also the water-absorbing expansion rubber 106 is prepared by physical blending or chemical grafting of a hydrophilic component and a rubber matrix, and after water absorption, the volume and mass of the water-absorbing expansion rubber 106 can be expanded by several times, so as to fill the connection gap between the inner clamping block 105 and the embedded groove 102, and the clamping between the pouring seat 107 and the setting block 103 further improves the firmness of the connection, and the inside of the pouring seat 107 needs to be filled with concrete during installation, so that the firmness of the connection between the bottom fence 101 and the upper fence 104 can be improved by gravity, and the firmness of the connection can also be improved in water which is also affected by gravity.

[0043] In summary, the cofferdam method which can shorten the construction period comprises the following specific steps:

[0044] S1, riverbed cleaning and pile building: use a mud suction machine to suck out the silt in the construction area, and embed steel pipe piles in a matrix shape into the water bottom, then install a limiting identification piece in the steel pipe pile, wherein the pre-buried depth of the steel pipe pile is greater than the depth of the silt on the riverbed surface;

[0045] S2, building a steel cofferdam: while the riverbed is cleaned and the piles are built, a modular steel cofferdam is built in the factory, and the modular steel cofferdam is spliced and assembled at the wharf, and the remaining steel cofferdam is left on both sides of the site for installation, then a limiting sleeve that is matched with the limiting identification piece installed in the steel pipe pile is installed on the inner wall of the steel cofferdam, and the steel cofferdam spliced into a whole is lifted by a gantry crane and placed on a deck barge, and the deck barge transports the steel cofferdam to the installation area;

[0046] S3, preparation for installation: when the deck barge is used to transport the steel cofferdam to the installation area, the riverbed under the steel pipe pile is cleaned according to the size of the steel cofferdam, and the riverbed under the steel pipe pile is excavated 8-12m in a process of first inclination and then flattening, then the sludge in the excavated area is sucked out with a mud suction machine, the accumulation of silt in the installation area is reduced, so that the steel cofferdam can be placed at the bottom of the riverbed, the firmness of the installation is improved, then the whole steel cofferdam is lifted by the lifting equipment and placed for 12-18s to observe whether there is anything unusual, when the steel cofferdam is stable and stationary, the subsequent lifting work is carried out, then the steel cofferdam is lifted to the upper side of the steel pipe pile and aligned again, and then placed and stabilized for a while, and the installation work is completed;

[0047] S4, cofferdam installation: the lifting equipment lowers the steel cofferdam to the matrix-shaped steel pipe pile, so that the steel cofferdam is placed outside the steel pipe pile due to gravity and completes the preliminary installation work, then the concrete is poured at the edge of the steel cofferdam, the concrete is poured from both sides to the middle crossbar, the inside of the steel cofferdam is divided into separate spaces, then the concrete is dried, then the installation position and angle are adjusted again by the lifting equipment, and the hydraulic rod is used for fine adjustment, the installation gap is reduced, the position is accurately connected, and the installation work is completed.

[0048] S5, defense treatment: after the installation position and angle are adjusted again by the lifting equipment and the hydraulic rod is used for fine adjustment, the water is pumped into the steel cofferdam by the circulating pump, so that the steel cofferdam is installed by lifting the gravity, and the circulating pump stops working when the steel cofferdam is 1.8-2.2m away from the water, the steel cofferdam is adjusted, the water is injected into the separate spaces in the steel cofferdam by the circulating pump to control the balance of the steel cofferdam, so that the installation of the steel cofferdam meets the construction requirements, then the adjustment is carried out again when it is sunk to 0.3-0.7m, the horizontal installation of the steel cofferdam is ensured, and finally the circulating pump works again to pump water into the steel cofferdam, so that the bottom pin in the steel cofferdam is inserted into the riverbed to complete the installation of the steel cofferdam.

Claims

1. A method for constructing a cofferdam with a shortened construction period, characterized in that, Includes the following steps: S1. Riverbed dredging and foundation pile construction The silt in the construction area was sucked out using a sludge suction machine, and the steel pipe piles were buried deep into the water in a matrix pattern. Limiting markers were then installed in the steel pipe piles. S2, Construct a steel cofferdam Modular steel cofferdams are constructed in the factory and assembled at the dock. Then, limit sleeves that match the limit markers installed in the steel pipe piles are installed on the inner wall of the steel cofferdam. The assembled steel cofferdam is then lifted by a gantry crane, placed on a deck barge, and transported to the installation area. S3. Installation Preparations When transporting the steel cofferdam to the installation area using a deck barge, the riverbed below the steel pipe piles is cleared according to the size of the steel cofferdam and the riverbed below the steel pipe piles is excavated 8-12m. Then, the entire steel cofferdam is lifted and placed still. After the steel cofferdam is still, the lifting work is carried out, and the steel cofferdam is lifted above the steel pipe piles and aligned for installation. S4, Cofferdam Installation The hoisting equipment lowers the steel cofferdam to the matrix of steel pipe piles, allowing the steel cofferdam to sink under gravity and complete the initial installation. Then, concrete is poured around the edges of the steel cofferdam, and the concrete is allowed to dry. The hoisting equipment is then used to readjust the installation position and angle, and hydraulic rods are used to make fine adjustments to achieve precise alignment. S5, Reinstall After the installation position and angle are readjusted using hoisting equipment and fine-tuned using hydraulic rods, water is pumped into the steel cofferdam using a circulating pump, causing the steel cofferdam to be lifted by gravity and sink for installation. The circulating pump is stopped when the steel cofferdam is 1.8-2.2m below the water surface, and the steel cofferdam is adjusted. Then, when it sinks to 0.3-0.7m, it is adjusted again to ensure that the steel cofferdam is installed horizontally. Finally, the circulating pump is turned on again to pump water into the steel cofferdam so that the bottom pins inside the steel cofferdam are inserted into the riverbed to complete the installation of the steel cofferdam. The steel cofferdam includes a bottom fence (101), an embedding groove (102), an upper fence (104), an inner locking block (105), and a water-absorbing and expanding rubber (106). The embedding groove (102) is provided on the inner wall of the bottom fence (101), the upper fence (104) is provided on the top of the bottom fence (101), and the inner locking block (105) is provided on the bottom inner wall of the upper fence (104). The water-absorbing and expanding rubber (106) is provided on the outer surface of the inner locking block (105). The steel cofferdam also includes a casting base (107) and a connecting block (108). The casting base (107) is connected to the inner wall of the upper fence (104) and extends downward. The connecting block (108) is provided at the bottom of the casting base (107), and a placement block (103) is provided below the casting base (107).

2. The cofferdam construction method for shortening the construction period according to claim 1, characterized in that: In step S1, during the riverbed cleaning and foundation pile construction process, the pre-embedding depth of the steel pipe piles is greater than the depth of the silt on the riverbed surface.

3. The cofferdam construction method for shortening the construction period according to claim 1, characterized in that: In step S2, the construction of the steel cofferdam is carried out in a synchronized manner with the dredging of the riverbed and the construction of the foundation piles.

4. The cofferdam construction method for shortening the construction period according to claim 1, characterized in that: During the preparatory work for installation in step S3, the hoisting equipment lifts the entire steel cofferdam and holds it still for 15 seconds.

5. The cofferdam construction method for shortening the construction period according to claim 1, characterized in that: In step S4, during the installation of the cofferdam, the concrete poured at the edge of the steel cofferdam first goes from the two side edges to the middle horizontal bar, thus dividing the interior of the steel cofferdam into separate spaces.

6. The cofferdam construction method for shortening the construction period according to claim 1, characterized in that: During the reinstallation process in step S5, the steel cofferdam is adjusted by using a circulating pump to inject water into the separate spaces inside the steel cofferdam to control its balance, ensuring that the installation of the steel cofferdam meets the construction requirements.

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