Reservoir area deepwater covering-layer-free weir-first pile-second construction device

Abstract

The utility model relates to a reservoir area deepwater covering-layer-free weir-first pile-second construction device which is characterized in that a cofferdam drilling platform is arranged at the top in a double-wall steel cofferdam, and inner wall anchoring points are arranged on the inner wall of the double-wall steel cofferdam; positioning steel casings are arranged at four corners in the double-wall steel cofferdam, pile foundation steel casings are further arranged in the double-wall steel cofferdam in a driving mode, cofferdam positioning and lifting systems are arranged at the tops of the positioning steel casings, and the cofferdam positioning and lifting systems are fixedly connected with inner wall anchoring points through steel strands. The double-wall steel cofferdam has the advantages that the cofferdam positioning and lifting system is arranged on the steel casing in the double-wall steel cofferdam, and the cofferdam lowering and lifting system is arranged on the pile foundation steel casing so as to meet the requirements for lifting and lowering the double-wall steel cofferdam in the steel casing driving process or after pile foundation construction is completed, and the double-wall steel cofferdam is efficient and convenient to use; the launching wharf comprises an assembling site and a gliding ramp, and the operation space of hoisting machinery and the like required by cofferdam assembling is met.

Description

Technical Field

[0001] The utility model belongs to the field of deepwater foundation construction, in particular to a weir-first-and-piles-later construction device for deepwater reservoir areas without covering layers. Background Art

[0002] Double-wall steel cofferdam is a double-layer steel shell structure made of vertical angle steel reinforcement and several layers of circular horizontal trusses welded together. It is suitable for deep-water foundation construction, and its strength, rigidity, structural stability and impermeability should meet the requirements of the specification during its service life.

[0003] According to the order of bored pile construction, the construction of steel cofferdams can be generally divided into two methods: "first piles and then weirs" and "first weirs and then piles". "First piles and then weirs" means drilling piles first and then constructing the cofferdam, and "first weirs and then piles" means assembling and sinking the cofferdam first and then constructing bored piles. The existing double-walled steel cofferdam construction method is usually to first build a trestle construction platform, then process and manufacture the double-walled steel cofferdam in blocks, install the assembly platform on the steel casing, assemble the blocks in situ or weld and assemble them at the assembly site, and then use a gantry crane to lift the double-walled steel cofferdam onto a transport ship. The transport ship then transports the double-walled steel cofferdam to the vicinity of the installation location, and uses floating cranes and other methods to initially position the double-walled steel cofferdam, and then uses methods such as pouring wall cabin concrete or injecting water to control the elevation of the cofferdam top until the double-walled steel cofferdam sinks to the designed elevation and completes subsequent construction.

[0004] The existing double-wall steel cofferdam construction requires the use of large mechanical equipment such as gantry cranes and floating cranes. The on-site welding and hoisting workload is large, the construction restrictions are many, the cost is high, and the construction period is long, so there is still room for improvement. Utility Model Content

[0005] The utility model aims to overcome the shortcomings of the prior art and provide a weir-first-and-piles construction method for deep water reservoirs without covering layers.

[0006] This deep-water reservoir area without covering layer first weir then pile construction device includes: launching dock, trestle platform and cofferdam drilling platform;

[0007] There is a sliding ramp on the water side of the launching dock, and a rear anchor on the shore side. Air bags are placed on the sliding ramp. The trestle platform extends to the edge of the designed position of the double-walled steel cofferdam, and several winch traction systems are arranged on the trestle platform.

[0008] The cofferdam drilling platform is set at the top of the double-walled steel cofferdam, and the inner wall of the double-walled steel cofferdam is provided with inner wall anchoring points; positioning steel casings are set at the four corners of the double-walled steel cofferdam, and pile foundation steel casings are also driven into the double-walled steel cofferdam. A cofferdam positioning lifting system is set on the top of the positioning steel casing, and the cofferdam positioning lifting system is fixedly connected to the inner wall anchoring points through steel strands.

[0009] Preferably, the launching dock includes an assembly site and a sliding ramp, the sliding ramp is arranged on the water side of the assembly site, and a rear-pull anchor is arranged on the shore side of the assembly site. The rear-pull anchor is connected to the double-walled steel cofferdam by cables to temporarily fix the double-walled steel cofferdam on the assembly site.

[0010] Preferably, the airbag is cylindrical, and the length direction of the airbag is perpendicular to the inclination direction of the sliding ramp, and is used to cushion under the double-walled steel cofferdam when the double-walled steel cofferdam slides down.

[0011] Preferably, a bottom plate anchoring point is provided on the bottom plate of the double-walled steel cofferdam. After the cofferdam positioning and lifting system is removed, a cofferdam lowering and lifting system is provided on the top of the pile foundation steel casing. The cofferdam lowering and lifting system is fixedly connected to the inner wall anchoring point and the bottom plate anchoring point by steel strands.

[0012] Preferably, underwater bottom sealing concrete is poured on the inner bottom of the double-walled steel cofferdam, a concrete leveling layer is poured on the surface of the underwater bottom sealing concrete, and a counter-pressure corbel is welded on the steel casing at a height corresponding to the concrete leveling layer.

[0013] Preferably, a casing parallel connection is provided between the pile foundation steel casings, and the cofferdam drilling platform falls above the casing parallel connection.

[0014] The beneficial effects of the utility model are:

[0015] 1) The utility model arranges a cofferdam positioning and lifting system on the steel casing in the double-walled steel cofferdam, and arranges a cofferdam lowering and lifting system on the pile foundation steel casing, so as to meet the need of lifting and lowering the double-walled steel cofferdam during the steel casing installation process or after the pile foundation construction is completed, which is efficient and convenient.

[0016] 2) The utility model proposes a launching dock, including an assembly site and a sliding ramp, which meets the working space for lifting machinery and the like required for assembling the cofferdam, can ensure the assembly accuracy, improve the assembly quality and construction efficiency, and the double-walled steel cofferdam slides into the water without the need for large-scale mechanical equipment such as gantry cranes and floating cranes, so the lifting workload is small; at the same time, by arranging air bags, the sliding of the assembled double-walled steel cofferdam is facilitated, and corresponding rear-pull anchors are provided to make it safer.

[0017] 3) The utility model utilizes the winch traction system and the concrete block anchor traction system on the trestle platform to achieve the initial positioning of the double-wall steel cofferdam, which provides convenience for the subsequent construction of the steel casing and pile foundation and improves safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the plan layout of the launching dock;

[0019] Figure 2 This is a schematic diagram of anchoring and positioning of the cofferdam;

[0020] Figure 3This is a schematic diagram of inserting and driving the four-corner positioning steel casing;

[0021] Figure 4 Schematic diagram of the lifting system for cofferdam positioning;

[0022] Figure 5 Side view of the lifting system for positioning the cofferdam;

[0023] Figure 6 This is a schematic diagram of the lifting system for lowering the cofferdam;

[0024] Figure 7 Side view of the hoisting system for lowering the cofferdam.

[0025] Explanation of the accompanying reference numerals: post-pull ground anchor 01, cable 02, double-wall steel cofferdam 03, assembly site 04, sliding ramp 05, airbag 06, winch traction system 07, concrete block anchor traction system 08, trestle platform 09, cofferdam positioning and lifting system 10, casing inter-connection 11, inner wall anchorage point 12, cofferdam drilling platform 13, cofferdam lowering and lifting system 14, counter-pressure corbel 15, bottom plate anchorage point 16, concrete leveling layer 17, underwater bottom sealing concrete 18. DETAILED DESCRIPTION

[0026] The utility model is further described below in conjunction with the embodiments. The description of the following embodiments is only used to help understand the utility model. It should be pointed out that for ordinary people in this technical field, the utility model can also be modified in some ways without departing from the principle of the utility model, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

[0027] Embodiment 1

[0028] As an example, Figures 1 to 7 As shown, this deep water reservoir without covering layer first weir then pile construction device includes: launching dock, trestle platform 09 and cofferdam drilling platform 13;

[0029] A sliding ramp 05 is provided on the water side of the launching wharf. The launching wharf includes an assembly site 04 and a sliding ramp 05. The sliding ramp 05 is provided on the water side of the assembly site 04. A rear pull anchor 01 is provided on the shore side of the assembly site 04. The rear pull anchor 01 is connected to the double-walled steel cofferdam 03 through a cable 02, so that the double-walled steel cofferdam 03 is temporarily fixed on the launching wharf.

[0030] Assembly site 04 and downhill slope 05 need to be filled and leveled, hardened with C25 concrete, and set with longitudinal slopes of 2% and 5% respectively.

[0031] An airbag 06 is placed on the sliding ramp 05; the airbag 06 is cylindrical, and the length direction of the airbag 06 is perpendicular to the inclination direction of the sliding ramp 05, and is used to cushion under the double-walled steel cofferdam 03 when the double-walled steel cofferdam 03 slides down.

[0032] The trestle platform 09 extends to the edge of the designed position of the double-walled steel cofferdam 03 , and a plurality of winch traction systems 07 are arranged on the trestle platform 09 , which are used for initial positioning of the double-walled steel cofferdam 03 .

[0033] The top of the double-walled steel cofferdam 03 is flush with the top of the trestle platform 09; positioning steel casings are provided at the four corners of the double-walled steel cofferdam 03, and pile foundation steel casings are also driven into the double-walled steel cofferdam 03.

[0034] The inner wall of the double-walled steel cofferdam 03 is provided with an inner wall anchor point 12 for connecting the cofferdam positioning lifting system 10 or the cofferdam lowering lifting system 14. The cofferdam positioning lifting system 10 is arranged on the top of the positioning steel casing. The bottom plate of the double-walled steel cofferdam 03 is provided with a bottom plate anchor point 16 for connecting the cofferdam lowering lifting system 14.

[0035] Embodiment 2

[0036] As another embodiment, the second embodiment is proposed on the basis of the first embodiment. During the construction of the deep water reservoir without covering layer, the weir-first-pile-later construction device is:

[0037] An airbag 06 is placed on the sliding ramp 05, and the rear-pull anchor 01 is connected to the double-walled steel cofferdam 03 through the cable 02; the double-walled steel cofferdam 03 is controlled to enter the water along the sliding ramp 05 by the rear-pull anchor 01 and the cable 02; the sliding progress of the double-walled steel cofferdam 03 is controlled by the rear-pull anchor 01 and the cable 02. After the double-walled steel cofferdam 03 is assembled on the assembly platform 04, the airbags 06 are arranged on the assembly platform 04 and the sliding ramp 05. A small number of airbags 06 conflict with the position of the steel piers. After the airbags 06 are inflated, the steel piers are removed and then arranged.

[0038] The winch traction system 07 is used to pull the double-walled steel cofferdam 03 to one side against the fender of the pier platform 09. At the same time, the other direction of the double-walled steel cofferdam 03 is connected to the concrete block anchor traction system 08. The concrete block anchor traction system 08 reasonably selects concrete block anchors or Hall anchors according to the geological conditions of the riverbed or seabed. A winch is installed on the double-walled steel cofferdam 03 to tighten the steel wire rope of the concrete block anchor traction system 08 to complete the initial positioning of the double-walled steel cofferdam 03.

[0039] The bottom plate of the double-walled steel cofferdam 03 is opened, and the top surface of the double-walled steel cofferdam 03 is flush with the top surface of the trestle platform 09. The positioning steel casings are inserted and driven into the four corners of the double-walled steel cofferdam 03 by using a crawler crane or a floating crane. The cofferdam positioning lifting system 10 is installed on the positioning steel casings at the four corners of the double-walled steel cofferdam 03, which is used to lift the double-walled steel cofferdam 03 as a whole to accurately position the plane of the double-walled steel cofferdam 03, and adjust the water depth of the wall cabin of the double-walled steel cofferdam 03 according to the real-time water level to ensure that the force on a single lifting point does not exceed the design limit. In this embodiment, the limit value of the cofferdam positioning lifting system 10 in the stressed state is 50t.

[0040] After the other steel casings are inserted, the cofferdam is lifted by the cofferdam positioning and lifting system 10, and the inter-casing flat joint 11 is welded at the designed elevation on the casing, so that the cofferdam drilling platform 13 provided on the double-wall steel cofferdam 03 falls on the inter-casing flat joint 11.

[0041] Relying on the pile foundation steel casing, the cofferdam is erected and the lifting system 14 is lowered, and then the parallel connection 11 between the casings is cut off, and then underwater bottom sealing concrete 18 is poured at the bottom of the double-walled steel cofferdam 03.

[0042] When pouring the underwater bottom sealing concrete 18, a certain thickness of 30 cm is reserved for the subsequent construction of the concrete leveling layer 17. After the strength of the underwater bottom sealing concrete 18 reaches the requirement, the inside of the double-walled steel cofferdam 03 is pumped out, and then the back pressure bracket 15 is welded on the steel casing, and then the concrete leveling layer 17 is poured on the underwater bottom sealing concrete 18.

[0043] It should be noted that the parts in this embodiment that are the same or similar to those in the second embodiment can be referenced to each other and will not be described in detail in this application.

[0044] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

Claims

1. A weir-first-and-pile-later construction device for deep water reservoirs without covering layers, characterized in that: include: launching docks, trestle platforms and cofferdam drilling platforms; There is a sliding ramp on the water side of the launching dock, and a rear anchor on the shore side. Air bags are placed on the sliding ramp. The trestle platform extends to the edge of the designed position of the double-walled steel cofferdam, and several winch traction systems are arranged on the trestle platform. The cofferdam drilling platform is set at the top of the double-walled steel cofferdam, and the inner wall of the double-walled steel cofferdam is provided with inner wall anchoring points; positioning steel casings are set at the four corners of the double-walled steel cofferdam, and pile foundation steel casings are also driven into the double-walled steel cofferdam. A cofferdam positioning lifting system is set on the top of the positioning steel casing, and the cofferdam positioning lifting system is fixedly connected to the inner wall anchoring points through steel strands.

2. The weir-first-and-pile-later construction device for deep water reservoirs without covering layers according to claim 1 is characterized in that: The launching dock includes an assembly site and a sliding ramp. The sliding ramp is located on the water side of the assembly site. A rear-pull anchor is provided on the shore side of the assembly site. The rear-pull anchor is connected to the double-walled steel cofferdam through cables to temporarily fix the double-walled steel cofferdam on the assembly site.

3. The weir-first-and-pile-later construction device for deep water reservoir without covering layer according to claim 1 is characterized in that: The airbag is cylindrical, and the length direction of the airbag is perpendicular to the inclination direction of the sliding ramp. It is used to cushion under the double-walled steel cofferdam when the double-walled steel cofferdam slides down.

4. The weir-first-and-pile-later construction device for deep water reservoir without covering layer according to claim 1 is characterized in that: The bottom plate of the double-walled steel cofferdam is provided with a bottom plate anchoring point. After the cofferdam positioning and lifting system is removed, a cofferdam lowering and lifting system is provided on the top of the pile foundation steel casing. The cofferdam lowering and lifting system is fixedly connected to the inner wall anchoring point and the bottom plate anchoring point by steel strands.

5. The weir-first-and-pile-later construction device for deep water reservoir without covering layer according to claim 1 is characterized in that: The inner bottom of the double-walled steel cofferdam is poured with underwater bottom concrete, the surface of the underwater bottom concrete is poured with a cast concrete leveling layer, and a counter-pressure corbel is welded on the steel casing at a height corresponding to the concrete leveling layer.

6. The weir-first-and-pile-later construction device for deep water reservoir without covering layer according to claim 1 is characterized in that: There are parallel connections between the steel casings of the pile foundation, and the cofferdam drilling platform is located above the parallel connections between the casings.

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