A rapid construction method of a steel pipe pile cofferdam

Abstract

The application provides a kind of steel pipe pile cofferdam rapid construction method, comprising the following steps: steel pipe pile, surrounding purlin, internal support and force transmission element are made in rear field;Installation is assembled when cofferdam is used to assemble corbel;The surrounding purlin and internal support are assembled into integral frame type on the assembled corbel, the force transmission element is hung on the assembled surrounding purlin away from the side of the sliding groove, and the lowering system is set;The assembled corbel internal support is synchronously lowered to the design position through the lowering system after the assembled corbel is removed;Steel pipe pile is inserted and driven into position along the sliding groove and is closed, and the cofferdam is compact and does not leak water through the grouting pipe reserved in the steel pipe pile;The cofferdam is underwater bottom sealing, and the construction platform is pumped after reaching the design strength.The steel pipe pile and the force transmission element are closely attached, the cofferdam has good integrity, high accuracy, reliable stress, and does not need to set the inserted guide, and the construction period, quality, safety and economy are significantly improved.

Description

Technical Field

[0001] This invention relates to the field of steel pipe pile cofferdam construction technology, specifically a rapid construction method for steel pipe pile cofferdams. Background Technology

[0002] Currently, for the construction of deep-water (greater than 20 meters) interlocking steel pipe pile cofferdams, the general procedure is to first assemble the integral frame waler and internal supports, then lower the waler internal supports to the designed position using a lowering system, and finally drive the interlocking steel pipe piles to close the gap. After the underwater bottom seal reaches sufficient strength, water is pumped down to each layer of waler to install the force transmission components between the waler and the steel pipe piles on-site, completing the construction of the interlocking steel pipe pile cofferdam. However, this traditional construction method suffers from several drawbacks. Because the size of the gap between the waler and the steel pipe piles cannot be precisely controlled, it requires on-site measurement of the gap size, cutting force transmission components to the appropriate dimensions, and then welding them between the waler and the steel pipe piles. This makes the installation of the force transmission components difficult, as a tight fit between the waler and the steel pipe piles is impossible. Furthermore, the construction period is long, and these force transmission components cannot be reused, resulting in poor economic efficiency. Summary of the Invention

[0003] In view of the above-mentioned prior art, the present invention proposes a rapid construction method for steel pipe pile cofferdams.

[0004] This invention provides a rapid construction method for steel pipe pile cofferdams, comprising the following steps:

[0005] S1. According to the dimensions required in the drawings, steel pipe piles, walers, internal supports and force transmission components are manufactured in the back-end; one side of the force transmission component is provided with a sliding groove, and the outer side of the steel pipe pile is provided with a slider, which can be slidably connected with the sliding groove.

[0006] S2. After the on-site bored pile construction is completed, the drilling platform is dismantled and the assembly brackets used for assembling the cofferdam are installed.

[0007] S3. Transport the steel pipe piles, walers, internal supports and force transmission components that have been processed and manufactured in the back-end to the site. Assemble the walers and internal supports into an integral frame according to the design drawings on the assembly brackets set in step 2. Hang the side of the force transmission component away from the slide on the assembled walers and set up the lowering system.

[0008] S4. Dismantle the assembled corbels and simultaneously lower the overall frame-type waler internal support to the designed position using the lowering system;

[0009] S5. Align the slider of the steel pipe pile with the groove of the force transmission component, drive the steel pipe pile into place along the groove and close the dam, and grout through the grouting pipe reserved in the steel pipe pile to make the cofferdam tight and leak-proof.

[0010] S6. The bottom of the cofferdam is sealed underwater. After the design strength is reached, the pier is constructed by pumping water and the system is converted to construct the pier body.

[0011] Preferably, in S1, the steel pipe pile is a lock-joint steel pipe pile.

[0012] Preferably, in S2, the assembled bracket is a pull-out assembled bracket.

[0013] Preferably, the pull-out assembly bracket is installed on the steel casing.

[0014] Preferably, in S3, the lowering system has a lowering guide mechanism.

[0015] Preferably, in S5, if hard rock is encountered that is difficult to penetrate, a groove is milled in advance.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. This invention changes the installation method of force transmission components from installing them after driving steel pipe piles to pre-hanging them on the waler and installing them together with the internal supports of the overall frame waler. Each layer of the force transmission component is equipped with a continuous sliding groove. Then, with the help of the sliding groove of the force transmission component, the steel pipe piles with sliders are driven into place. The steel pipe piles are closely attached to the force transmission components, resulting in good overall cofferdam integrity, high accuracy, and reliable force bearing. Moreover, there is no need to set up additional driving guides, which significantly improves the construction period, quality, safety, and economy.

[0018] 2. This invention features a force-transmitting component with a sliding groove, pre-installed on the waler. This component can be pre-fabricated according to the dimensions of the waler and steel pipe piles, ensuring high precision and reliable installation quality. It avoids the uncontrollable quality of on-site welding of the force-transmitting component later, saves on-site installation time, and guarantees the bearing capacity between the interlocking steel pipe piles and the inner support of the waler. It is convenient and efficient to construct. Furthermore, the force-transmitting component can be recycled and reused, making it highly applicable and economically beneficial.

[0019] 3. In this invention, the assembled bracket is installed on the slotted steel casing, which is simple to fix. Compared with the original method of welding and assembling the cofferdam structure first and then cutting and lowering the cofferdam, it saves on-site welding and cutting time, and the operation is safe, convenient and reliable.

[0020] 4. In this invention, after the bottom of the steel pipe pile cofferdam is sealed, water is pumped out. The steel pipe pile deforms and closely adheres to the force transmission component, which then transmits the force to the inner support of the waler. The cofferdam has good integrity, high consistency with the calculation model, clear and reliable force transmission, and high construction quality and safety reliability. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the force transmission component in an embodiment of the present invention.

[0022] Figure 2-5 This is a schematic diagram illustrating an embodiment of the present invention.

[0023] In the diagram: 1. Steel pipe pile; 2. Waler; 3. Internal support; 4. Force transmission component; 5. Slide groove; 6. Sliding block; 7. Steel casing; 8. Assembled bracket; 9. Lowering system; 10. Pipe cap. Detailed Implementation

[0024] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific illustrations. Example

[0025] A rapid construction method for steel pipe pile cofferdams includes the following steps:

[0026] S1. According to the dimensions specified in the drawings, fabricate steel pipe piles 1, walers 2, internal supports 3, and force transmission components 4 in the back-end; Figure 1 As shown, the force transmission component 4 is welded from steel plates and manufactured according to the dimensions of the steel pipe pile 1 and the waler 2. The contact portion with the steel pipe pile 1 is arc-shaped, allowing it to fit snugly against the pile. The contact portion with the waler 2 is equipped with hooks to hang on the upper flange of the waler 2. A C-shaped steel continuous sliding groove 5 is vertically provided in the middle of the arc-shaped side of the force transmission component 4, which can limit the insertion of the steel pipe pile 1, improving insertion accuracy. The entire force transmission component 4 can withstand and transmit a load of at least 1000KN. Figure 2 As shown, a slider 6 is provided on the outer side of the steel pipe pile 1. The slider 6 can be slidably connected with the groove 5 to limit the steel pipe pile 1 for driving.

[0027] Among them, the steel pipe pile 1 adopts φ720×14mm interlocking steel pipe piles with a length of 27m; it adopts four layers of walers 2 and internal supports 3. The first layer of walers adopts 2HM588×300mm steel, and the remaining layers adopt 2HN900×300mm steel; the force transmission component 4 is welded from 12mm steel plates. One side is arc-shaped and fits with the steel pipe pile 1, and the other side is equipped with hooks to hang on the upper flange of the waler 2. The middle is reinforced with stiffening plates, and the stiffening plates are equipped with finished C-shaped steel through-length sliding grooves 5. The steel structure is made of Q235B structure.

[0028] S2. After the on-site bored pile construction is completed, the drilling platform is dismantled, such as... Figure 3 As shown, the pull-out assembly bracket 8 is used when installing the cofferdam on the steel casing 7. The assembly bracket 8 is made of double-section steel, placed on the pre-grooved steel casing 7, and simply fixed. Compared with the original triangular assembly bracket, the pull-out assembly bracket 8 has a simple and convenient structure. At the same time, compared with the original method of welding the bracket to assemble the cofferdam structure and then cutting it down to lower the cofferdam, this step can save on-site welding and cutting time, and the operation is safe, convenient, and reliable.

[0029] Among them, the assembled bracket 8 is made of 2HN900×300mm steel. The steel casing 7 has a slot (640×920mm) that is slightly larger than the double-section steel at the corresponding position. The steel casing 7 is reinforced around the slot. The assembled bracket 8 is placed on the slotted steel casing 7 and simply fixed for assembling the waler 2. In this way, after the overall frame waler internal support is assembled, the lowering system 9 is installed and lifted slightly, and the assembled bracket 8 can be pulled out to lower the waler internal support.

[0030] S3, such as Figure 2 , 3 As shown, the steel pipe piles 1, walers 2, inner supports 3 and force transmission components 4, which are processed and manufactured in the back-end, are transported to the site. The walers 2 and inner supports 3 are assembled into an integral frame on the assembly brackets 8 set in step 2 according to the design drawings. The force transmission components 4 are pre-hung on the assembled walers 2. A lowering system 9 is set up, which has a lowering guide mechanism.

[0031] S4, such as Figure 4 As shown, the bracket 8 is quickly pulled out and dismantled, and the overall frame-type waler internal support is simultaneously lowered to the design position through the lowering system 9. The lowering system 9 uses 2HN900×300mm steel sections inserted into the slotted steel casing 7, and a lowering guide mechanism is arranged around the perimeter, including 8 lowering lifting points. Each lowering lifting point is equipped with a 150T through-hole jack and a φ80 precision rolled threaded steel bar. The overall frame-type waler internal support is lowered to the design position simultaneously through the 8 lowering lifting points.

[0032] S5, such as Figure 2 , 5 As shown, the slider 6 of the steel pipe pile 1 is aligned with the groove 5 of the force transmission component 4. The steel pipe pile 1 is driven into place along the groove 5 using a pile driving equipment and then closed. If hard rock or other objects are difficult to drive, the groove can be milled in advance. Grouting is then performed through the grouting pipe reserved in the steel pipe pile 1 to make the cofferdam dense and leak-proof.

[0033] Among them, the piling equipment drives steel pipe piles 1 along the force transmission component 4, starting from the long side of the cofferdam and driving to the short side, and accurately measuring the size of the closure piles to complete the closure of the entire cofferdam.

[0034] S6, such as Figure 5 As shown, the grouting is carried out by pre-reserved grouting pipes of steel pipe pile 1 to make the cofferdam tight and leak-proof around the perimeter. Then, the bottom is sealed underwater to ensure that the bottom is leak-proof. At this time, the cofferdam can be pumped out to make the interior of the cofferdam a waterless environment, and then the pier cap 10 can be constructed, and the system can be converted to construct the pier body.

[0035] This invention first lowers the integral frame-type waler inner support with force transmission component 4, and then drives steel pipe piles to close the cofferdam. The force transmission component 4 is set between the waler 2 and the steel pipe pile 1. The pre-installed force transmission component 4 can be made according to the size of the waler 2 and the steel pipe pile 1, with high precision and reliable installation quality. It avoids the uncontrollable quality of the later on-site welding of the force transmission component 4, and saves on-site installation time. It ensures the bearing capacity between the interlocking steel pipe pile and the waler inner support, making construction convenient and efficient. In addition, the force transmission component 4 can be recycled and reused, with strong applicability and significant economic benefits.

[0036] The above are merely embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structures made using the contents of the present invention specification and drawings, whether directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of the present invention.

Claims

1. A method for quickly constructing a steel pipe pile cofferdam, characterized in that, The method comprises the following steps: S1, according to the size of the drawing, the rear field is made of steel pipe pile, surrounding purlin, internal support and force transmission member; one side of the force transmission member is provided with a sliding groove, and the outer side of the steel pipe pile is provided with a sliding block, and the sliding block is slidably connected with the sliding groove; S2, after the construction of the field bored pile is completed, the drilling platform is removed, and the assembly bracket used for assembling the cofferdam is installed; S3, the steel pipe pile, surrounding purlin, internal support and force transmission member processed in the rear field are transported to the field, and the surrounding purlin and internal support are assembled into an integral frame type according to the design drawing on the assembly bracket set in step S2, the force transmission member is hung on the assembled surrounding purlin away from the sliding groove, and a lowering system is arranged; S4, the assembly bracket is removed, and the integral frame type surrounding purlin and internal support are lowered synchronously to the designed position through the lowering system; S5, the sliding block of the steel pipe pile is aligned with the sliding groove of the force transmission member, the steel pipe pile is inserted and driven into place along the sliding groove and is closed, grouting is carried out through the grouting pipe reserved in the steel pipe pile to make the cofferdam around the cofferdam compact and not leak water; S6, the bottom of the cofferdam is sealed underwater, the bearing platform is constructed after the design strength is reached, and the system is converted to construct the pier body.

2. The steel pipe pile cofferdam rapid construction method according to claim 1, characterized by, In S1, the steel pipe pile is a lock pipe pile.

3. The method of claim 1, wherein the steel pipe pile cofferdam is constructed by using a plurality of steel pipe piles, and the plurality of steel pipe piles are connected to each other by a plurality of connecting members. In S2, the assembly bracket is a pull-out type assembly bracket.

4. The steel pipe pile cofferdam rapid construction method according to claim 3, characterized by, The pull-out type assembly bracket is installed on the steel casing.

5. The method of claim 1-4, wherein the steel pipe pile cofferdam is constructed rapidly by the steps of: In S3, the lowering system has a lowering guide mechanism.

6. The method of claim 1-4, wherein the steel pipe pile cofferdam is constructed rapidly by the steps of: In S5, if hard rock is encountered and it is difficult to insert and drive, a groove is milled in advance.

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