Synchronous lowering construction structure and method for combined type double-wall steel cofferdam

Abstract

The invention relates to a combined type double-wall steel cofferdam synchronous lowering construction structure and method, and relates to the technical field of bridge construction.The construction structure comprises a foundation pile set and a steel cofferdam, the steel cofferdam is arranged on the outer side of the foundation pile set in a surrounding mode, the steel cofferdam is of a layered structure and combined, and the steel cofferdam is divided into a lower section, a middle section and an upper section in the vertical direction and is sequentially erected upwards; the lower section is hung on the outer side of the foundation pile set and lifted and lowered through the intelligent program control synchronous lifting and lowering system, floating-state heightening of the middle section and the upper section is sequentially conducted through the combined steel cofferdam floating-state balance heightening technology, and guide sliding rails are arranged on the inner side of the middle section and the inner side of the upper section correspondingly. The guiding sliding rail abuts against the foundation pile and is in sliding guiding with the foundation pile. The descending of the middle section and the upper section is realized, the descending work efficiency of the steel cofferdam is accelerated, the sections are stably and accurately descended, and the cofferdam uniformly sinks and falls into a bed.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to a combined double-wall steel cofferdam synchronous lowering construction structure and method. Background Art

[0002] With the rapid development of my country's bridge industry, the construction scale of cross-river bridges has been expanding. In the construction of underwater bridge piers, cofferdam construction has the characteristics of simple assembly, high safety, strong controllability and cost saving in terms of technology, and is widely used in the construction of underwater bridge piers.

[0003] In the prior art, the method for lowering steel cofferdams in deepwater bare rock areas generally adopts manual lowering with jacks. Due to the large size of the steel cofferdam, it is difficult to lower it in one go, the lowering speed is slow, and the balance of the cofferdam body is difficult to control during the lowering process, which poses great risks to construction safety and quality. Summary of the invention

[0004] In order to improve the problems in the steel cofferdam lowering construction process in the above-mentioned background technology, the present invention provides a combined double-wall steel cofferdam synchronous lowering construction structure and method.

[0005] The invention provides a combined double-wall steel cofferdam synchronous lowering construction structure and method using the following technical solutions: A combined double-wall steel cofferdam synchronous lowering construction structure comprises a foundation pile group and a steel cofferdam, wherein the foundation pile group comprises foundation piles distributed in a matrix and the lower ends of the foundation piles extend underwater, and the steel cofferdam is arranged outside the foundation pile group. The steel cofferdam adopts a layered structure and is combined, and is divided into a lower segment, a middle segment and an upper segment in the vertical direction and are successively erected upward, the lower segment is suspended outside the foundation pile group and is lifted and lowered by an intelligent program-controlled synchronous lifting and lowering system, and guide rails are arranged on the inner sides of the middle segment and the upper segment, and the guide rails abut against the foundation piles and slide and guide the foundation piles.

[0006] Preferably, the intelligent program-controlled synchronous lifting and lowering system includes a load-bearing frame installed on the foundation piles, and hanging legs installed on the inner wall of the steel cofferdam, and multiple lifting pump stations and jacks are evenly installed on the load-bearing frame. The jacks extend steel strands and are connected to the hanging legs. Displacement sensors are arranged at the bottom of the hanging legs, and the displacement sensors and the lifting pump stations are both communicatively connected to the external master control platform.

[0007] Preferably, the jack uses a through-type jack, and the lifting pump station provides jack output power and is set corresponding to the number of jacks.

[0008] Preferably, the steel cofferdam comprises two sets of steel plate structures arranged in parallel, and the two sets of steel plate structures are separated to form a compartment.

[0009] Preferably, the cross section of the steel cofferdam is a rounded rectangular structure with arcs on both sides.

[0010] A method for synchronously lowering a combined double-wall steel cofferdam is provided, and a construction structure for synchronously lowering a combined double-wall steel cofferdam is constructed, comprising the following steps: Step 1: Process the compartment structures of the upper, middle and lower sections of the steel cofferdam and transport them to the construction site; Step 2: erecting a construction platform for the lower segment and assembling and welding the lower segment; preferably, in step 2, the construction platform includes a support frame erected on the foundation piles, and a steel plate is fixed on the outer edge of the support frame to form a support structure for supporting the lower segment; Step 3: Install the intelligent program-controlled synchronous lifting and lowering system, use the foundation piles as the load-bearing foundation, set up the load-bearing frame on the foundation piles, install multiple lifting pump stations and jacks on the load-bearing frame, and extend the steel strands from the jacks to hang the lower segment; Step 4: Measure the height data of each block of the lower section, and adjust the oil pressure of each lifting pump station according to the height data to achieve synchronous lifting and lowering displacement of each block of the lower section; Step 5: Use the combined steel cofferdam floating balance heightening technology to sequentially raise the middle and upper segments. When a block is set up above the lower segment, pump out the water in the corresponding bottom compartment that is equivalent to the weight of the block, and mark it on the steel cofferdam with the calculated scale. Step 6: Use the double-layer lowering guide device construction technology to lower the middle section and the upper section. During the lowering process, guide rails are installed on the inner side of the middle section and the upper section of the steel cofferdam. The guide rails abut against the steel casing, and the steel cofferdam is sunk close to the steel casing by the action of water flow. Step 7: Pour concrete and inject water into the compartment synchronously and symmetrically, and the cofferdam sinks evenly and falls to the bed.

[0011] In summary, the present invention has the following beneficial technical effects: 1. The present invention aims at the synchronous lowering construction of a combined double-wall steel cofferdam, divides the steel cofferdam into a lower section, a middle section and an upper section in the vertical direction and erects them upward in sequence, the lower section is suspended and lifted and lowered by an intelligent program-controlled synchronous lifting and lowering system, the middle section and the upper section are connected in a floating state using the combined steel cofferdam floating balance connection technology, and the lowering of the middle section and the upper section is achieved in conjunction with the double-layer lowering guide device construction technology. Under the premise of ensuring the construction quality and safety, the efficiency of the steel cofferdam lowering is greatly accelerated, and the block splicing of the large-volume steel cofferdam is achieved, and the segmented and accurate lowering is achieved.

[0012] 2. The intelligent program-controlled synchronous lifting and lowering system proposed in the present invention uses the height data of each block of the lower segment measured by the displacement sensor to adjust the oil pressure of each lifting pump station to achieve the purpose of synchronous lifting and lowering of each block of the lower segment; the combined steel cofferdam floating balance connection technology proposed in the present invention draws out water equivalent to the weight of the block in the corresponding bottom section compartment when the block is erected above the lower segment, ensuring the relative balance of the steel cofferdam during the connection process, and cooperating with the guide rails on the inner side of the middle segment and the upper segment to realize the accurate lowering of the steel cofferdam. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic plan view of a construction platform according to an embodiment of the present invention; Figure 2 2 is a schematic elevation diagram of an intelligent program-controlled synchronous lifting and lowering system according to an embodiment of the present invention; Figure 3 is a schematic elevation diagram of the installation of the middle segment of an embodiment of the present invention; Figure 4 is a schematic elevation diagram of the installation of the upper segment of an embodiment of the present invention; Figure 5 is a plan view of a guide rail according to an embodiment of the present invention; Figure 6 1 is a schematic elevation view of a guide rail according to an embodiment of the present invention.

[0014] Explanation of the reference numerals in the accompanying drawings: 1. foundation pile group; 2. steel cofferdam; 3. foundation pile; 4. lower section; 5. middle section; 6. upper section; 7. intelligent program-controlled synchronous lifting and lowering system; 8. guide rail; 9. load-bearing frame; 10. hanging leg; 11. lifting pump station; 12. jack; 13. displacement sensor; 14. master control platform; 15. steel plate structure; 16. compartment; 17. block; 18. construction platform; 19. support frame; 20. steel strand. DETAILED DESCRIPTION

[0015] The following combination Figure 1-Figure 6 The present invention is described in further detail.

[0016] The embodiment of the invention discloses a combined double-wall steel cofferdam synchronous lowering construction structure and method.

[0017] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6A combined double-wall steel cofferdam synchronous lowering construction structure includes a foundation pile group 1 and a steel cofferdam 2. The foundation pile group 1 includes foundation piles 3 distributed in a matrix and the lower ends of the foundation piles 3 extend underwater. The steel cofferdam 2 is arranged outside the foundation pile group 1. The steel cofferdam 2 adopts a layered structure and is combined. It is divided into a lower segment 4, a middle segment 5 and an upper segment 6 in the vertical direction and is successively erected upward. The lower segment 4 is suspended outside the foundation pile group 1 and is lifted and lowered by an intelligent program-controlled synchronous lifting and lowering system 7. Guide rails 8 are arranged on the inner sides of the middle segment 5 and the upper segment 6. The guide rails 8 abut against the foundation piles 3 and slide and guide the foundation piles 3.

[0018] Reference Figure 2 The intelligent program-controlled synchronous lifting and lowering system 7 includes a load-bearing frame 9 installed on the foundation pile 3, and a hanging leg 10 installed on the inner wall of the steel cofferdam 2. A plurality of lifting pump stations 11 and jacks 12 are evenly installed on the load-bearing frame 9. The jacks 12 extend out of the steel strand 20 and are connected to the hanging legs 10. A displacement sensor 13 is arranged at the bottom of the hanging leg 10. The displacement sensor 13 and the lifting pump station 11 are both communicatively connected to the external master control platform 14.

[0019] Reference Figure 2 The jack 12 uses a through-type jack, and the lifting pump station 11 provides output power for the jack 12 and is set corresponding to the number of the jacks 12.

[0020] Reference Figure 4 The steel cofferdam 2 includes two sets of steel plate structures 15 arranged in parallel, and the two sets of steel plate structures 15 are separated and form a compartment 16.

[0021] Reference Figure 1 , Figure 5 The cross section of the steel cofferdam 2 is a rounded rectangular structure with arcs on both sides, which has stronger stress resistance.

[0022] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 A method for synchronously lowering a combined double-wall steel cofferdam is disclosed, wherein a combined double-wall steel cofferdam synchronously lowering construction structure is constructed, comprising the following steps: Step 1: Process the compartment 16 structure of each block 17 of the upper segment 6, the middle segment 5 and the lower segment 4 of the steel cofferdam 2 and transport them to the construction site; Step 2: Setting up the construction platform 18 of the lower segment 4 and assembling and welding the lower segment 4; In step 2, the construction platform 18 includes a support frame 19 erected on the foundation pile 3, and a 10 mm steel plate is fixed on the outer edge of the support frame 19 to form a support structure for supporting the lower segment 4; Step 3: Install the intelligent program-controlled synchronous lifting and lowering system 7, use the foundation pile 3 as the load-bearing foundation, set up the load-bearing frame 9 on the foundation pile 3, install multiple lifting pump stations 11 and jacks 12 on the load-bearing frame 9, the jacks 12 use through-type jacks, the lifting pump station 11 provides the jacks 12 with output power, and the lower segment 4 is suspended by extending high-strength steel strands through 8 120t jacks 12; Step 4: Measure the height data of each block 17 of the lower segment 4, and adjust the oil pressure of each lifting pump station 11 according to the height data to achieve synchronous lifting and lowering displacement of each block 17 of the lower segment 4; Step 5: dismantle the intelligent program-controlled synchronous lifting and lowering system 7, and assemble and weld the blocks 17 of the middle section 5 and the upper section 6. The floating connection of the middle section 5 and the upper section 6 is carried out in sequence through the combined steel cofferdam 2 floating balance connection technology. Each block 17 is set up above the lower section 4. In order to maintain the balance of the steel cofferdam 2, the water equivalent to the weight of the block 17 in the corresponding bottom compartment 16 is pumped out, and the water is marked on the steel cofferdam 2 with the calculated scale to ensure the relative balance of the steel cofferdam 2 during the connection process. Step 6: Use the double-layer lowering guide device construction technology to lower the middle section 5 and the upper section 6. Lower the middle section 5 and the upper section 6 in turn. During the lowering process, install the guide rails 8 inside the middle section 5 and the upper section 6 of the steel cofferdam 2. The guide rails 8 are mainly distributed in the arc section of the middle section 5 and the upper section 6, and also exist in the middle position on both sides of the middle section 5 and the upper section 6. The guide rails 8 abut the steel casing, and use the effect of water flow to make the steel cofferdam 2 sink close to the steel casing to achieve precise installation; Step 7: Pour concrete and inject water synchronously and symmetrically in the compartment 16, and the cofferdam sinks evenly and falls to the bed.

[0023] The implementation principle of a combined double-wall steel cofferdam synchronous lowering construction structure and method according to an embodiment of the present invention is as follows: first, a construction platform for the lower segment 4 is set up, and after the intelligent program-controlled synchronous lifting and lowering system 7 is installed, the lower segment 4 is lowered, and then the floating balance of the middle segment 5 is connected to the height, and the guide slide rail 8 is installed on the inner side of the middle segment 5 to achieve water injection and lowering of the middle segment 5, and then the floating balance of the upper segment 6 is connected to the height, and the guide slide rail 8 is installed on the inner side of the upper segment 6 to achieve water injection and lowering of the upper segment 6, and finally, concrete is poured at the blade foot of the steel cofferdam 2 to achieve the cofferdam landing.

[0024] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A combined double-wall steel cofferdam synchronous lowering construction structure, characterized in that: The invention comprises a foundation pile group (1) and a steel cofferdam (2), wherein the foundation pile group (1) comprises foundation piles (3) arranged in a matrix and the lower ends of the foundation piles (3) extend underwater, the steel cofferdam (2) is arranged outside the foundation pile group (1), the steel cofferdam (2) adopts a layered structure and is combined, and is divided into a lower segment (4), a middle segment (5) and an upper segment (6) in the vertical direction and are successively erected upwards, the lower segment (4) is suspended outside the foundation pile group (1) and is lifted and lowered by an intelligent program-controlled synchronous lifting and lowering system (7), and guide rails (8) are arranged inside the middle segment (5) and the upper segment (6), and the guide rails (8) abut against the foundation piles (3) and are slidably guided with the foundation piles (3).

2. A combined double-wall steel cofferdam synchronous lowering construction structure according to claim 1, characterized in that: The intelligent program-controlled synchronous lifting and lowering system (7) comprises a load-bearing frame (9) installed on a foundation pile (3), and a hanging leg (10) installed on the inner wall of a steel cofferdam (2), a plurality of lifting pump stations (11) and jacks (12) are evenly installed on the load-bearing frame (9), the jacks (12) extend steel strands and are connected to the hanging legs (10), a displacement sensor (13) is arranged at the bottom of the hanging legs (10), and the displacement sensor (13) and the lifting pump station (11) are both communicatively connected to an external master control platform (14).

3. A combined double-wall steel cofferdam synchronous lowering construction structure according to claim 2, characterized in that: The jack (12) uses a through-type jack, and the lifting pump station (11) provides output power for the jack (12) and is set corresponding to the number of the jacks (12).

4. The combined double-wall steel cofferdam synchronous lowering construction structure according to claim 1 is characterized in that: The steel cofferdam (2) comprises two sets of steel plate structures (15) arranged in parallel, and the two sets of steel plate structures (15) are separated to form a compartment (16).

5. The combined double-wall steel cofferdam synchronous lowering construction structure according to claim 1 is characterized in that: The cross section of the steel cofferdam (2) is a rounded rectangular structure with arcs on both sides.

6. A method for synchronously lowering a combined double-walled steel cofferdam, which is to construct a combined double-walled steel cofferdam synchronously lowering construction structure according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1: Processing the compartment (16) structure of each segment (17) of the upper segment (6), middle segment (5) and lower segment (4) of the steel cofferdam (2) and transporting it to the construction site; Step 2: Setting up the construction platform (18) of the lower segment (4) and assembling and welding the lower segment (4); Step 3: Install an intelligent program-controlled synchronous lifting and lowering system (7), use the foundation pile (3) as a load-bearing foundation, set up a load-bearing frame (9) on the foundation pile (3), install multiple lifting pump stations (11) and jacks (12) on the load-bearing frame (9), and extend the steel strand (20) from the jack (12) to suspend the lower segment (4); Step 4: measuring the height data of each block (17) of the lower segment (4), and adjusting the oil pressure of each lifting pump station (11) according to the height data to achieve synchronous lifting and lowering displacement of each block (17) of the lower segment (4); Step 5: The middle section (5) and the upper section (6) are connected in floating state in sequence by using the floating balanced connection technology of the combined steel cofferdam (2). Each time a section block (17) is set up above the lower section (4), water equivalent to the weight of the section block (17) in the corresponding bottom section compartment (16) is pumped out and marked on the steel cofferdam (2) with the calculated scale; Step 6: Use the double-layer lowering guide device construction technology to lower the middle section (5) and the upper section (6). During the lowering process, guide rails (8) are installed inside the middle section (5) and the upper section (6) of the steel cofferdam (2). The guide rails (8) abut against the steel casing, and the steel cofferdam (2) is sunk close to the steel casing by the action of water flow. Step 7: Pour concrete and inject water synchronously and symmetrically in the compartment (16), and the cofferdam sinks evenly and falls to the bed.

7. A method for synchronously lowering a combined double-walled steel cofferdam according to claim 6, characterized in that: In step 2, the construction platform (18) includes a support frame (19) erected on the foundation pile (3), and a steel plate is fixed on the outer edge of the support frame (19) to form a support structure for supporting the lower segment (4).

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