Composite cofferdam structure for deepwater channel expanding excavation construction

Abstract

The utility model provides a deepwater channel expanding excavation construction composite cofferdam structure. The deepwater channel expanding excavation construction composite cofferdam structure comprises a composite cofferdam structure body arranged on a channel and located on the periphery of a to-be-excavated area. The composite cofferdam structure comprises inner side lock catch steel pipe piles located on the inner side, outer side lock catch steel pipe piles are arranged on the outer sides of the inner side lock catch steel pipe piles, and a first inclined inner side lock catch steel pipe pile and a second inclined inner side lock catch steel pipe pile are arranged between the two ends of each inner side lock catch steel pipe pile and an embankment correspondingly. A first oblique outer side lock catch steel pipe pile and a second oblique outer side lock catch steel pipe pile are arranged between the two ends of the outer side lock catch steel pipe pile and the embankment correspondingly. The cofferdam structure can be suitable for deepwater channel expanding excavation construction under the complex stratum condition, has good structural stability and water sealing performance, and not only can guarantee construction safety during deepwater channel expanding excavation construction, but also can guarantee traffic safety of an existing channel; in addition, the construction efficiency of channel expanding excavation construction is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of channel excavation construction, in particular to a composite cofferdam structure for deep-water channel expansion and excavation construction. Background Art

[0002] At present, construction cofferdams are required in channel excavation construction to provide a corresponding construction environment for subsequent procedures. Especially in channel expansion construction projects, not only the complex water environment but also the navigation requirements must be considered, which makes the implementation of cofferdams more difficult. At present, the commonly used cofferdam structures in channel expansion construction are steel sheet pile cofferdams and steel pipe pile cofferdams. However, steel sheet pile cofferdams are generally suitable for shallow water depths and cannot be used as cofferdams for deep-water channel expansion construction. Steel pipe pile cofferdams can be used as deep-water construction cofferdams, but due to the certain gap between the steel pipes, the cofferdam is easily deformed under the action of water pressure, which makes it more difficult to seal the water. The water sealing layer needs to be repaired many times during the implementation process, which leads to increased costs. Utility Model Content

[0003] In response to the problems existing in the above-mentioned conventional methods, the present invention aims to provide a composite cofferdam structure for deep-water channel excavation construction. This cofferdam structure can be applied to deep-water channel excavation construction under complex geological conditions, and has good structural stability and water-sealing performance. It can not only ensure construction safety during deep-water channel excavation construction, but also ensure the safety of traffic in existing channels. In addition, it can effectively improve the construction efficiency of channel excavation construction.

[0004] In order to achieve the above technical features, the purpose of the present utility model is achieved as follows: a composite cofferdam structure for deepwater channel expansion and excavation construction, comprising a composite cofferdam structure arranged on the channel and located outside the proposed excavation area;

[0005] The composite cofferdam structure includes an inner locking steel pipe pile located on the inner side, an outer locking steel pipe pile is arranged on the outer side of the inner locking steel pipe pile, a first oblique inner locking steel pipe pile and a second oblique inner locking steel pipe pile are respectively arranged between the two ends of the inner locking steel pipe pile and the embankment, and a first oblique outer locking steel pipe pile and a second oblique outer locking steel pipe pile are respectively arranged between the two ends of the outer locking steel pipe pile and the embankment.

[0006] The inner locking steel pipe pile, the outer locking steel pipe pile, the first oblique inner locking steel pipe pile, the first oblique outer locking steel pipe pile, the second oblique inner locking steel pipe pile and the second oblique outer locking steel pipe pile all adopt the same structural form and respectively include a main steel pipe, a locking pipe with a notch is welded and fixed on the outer wall of the main steel pipe, and a locking plate is symmetrically welded and fixed on the other side of the outer wall of the main steel pipe; adjacent main steel pipes are locked together by the locking pipe and the locking plate.

[0007] The lock pipe is made of a steel pipe, and the lock plate is made of an I-shaped steel.

[0008] During installation, one end of the lock plate is inserted into the inside of the lock pipe from the gap.

[0009] The gap in the inside of the lock pipe is filled with a lock pipe filler, which is made of clay, sawdust or a compressible plastic strip.

[0010] Symmetrical outer and inner reinforcing ribs are welded to the upper outer wall of the inner and outer lock steel pipe piles, the first and second oblique inner and outer lock steel pipe piles, and the second oblique inner and outer lock steel pipe piles, and pin holes are formed in the inner reinforcing ribs at certain intervals. Crossed scissors are hinged between the inner reinforcing ribs between the inner and outer lock steel pipe piles, and the two ends of the scissors are hinged to the corresponding pin holes through pins, and the ends of the pins are provided with safety cards.

[0011] The bottom end of the main steel pipe is embedded in the inside of the pile hole, the pile hole sequentially passes through the cover layer, the permeable layer and the impermeable layer of the waterway, and the pile hole penetrates into the impermeable layer by at least 5m;

[0012] The gap between the main steel pipe and the pile hole is closed by clay.

[0013] The cavity between the inner and outer lock steel pipe piles is filled with a pile filler.

[0014] The pile filler is clay.

[0015] Pulling holes are provided on the outer reinforcing ribs at certain intervals, and pulling anchor devices are connected to the pulling holes.

[0016] The pulling anchor device includes a pulling line, one end of which is connected to the pulling hole, and the other end is connected to a ground anchor arranged on the natural foundation. An adjusting device for adjusting the tension degree is arranged in the middle of the pulling line.

[0017] A tension sensor is arranged in the adjusting device, which senses the influence of water level change on the pulling line, avoids the fracture of the pulling line due to excessive stress or the instability of the cofferdam due to insufficient stress, adjusts the tension of the pulling line through the adjusting device, and controls the tension within a suitable threshold.

[0018] A pressure top walkway plate is arranged on the top of the inner and outer lock steel pipe piles, the first and second oblique inner and outer lock steel pipe piles, and the second oblique inner and outer lock steel pipe piles.

[0019] The interior of the main steel pipe is provided with a steel pipe filling material, which is made of sand pebbles or gravel.

[0020] The utility model has the advantages of:

[0021] 1. The cofferdam structure can be applied to deep water channel excavation construction under complex stratum conditions, has good structural stability and water sealing performance, can ensure construction safety during deep water channel excavation construction, and also ensures the safety of existing waterways; in addition, the construction efficiency of channel excavation construction is effectively improved.

[0022] 2. The lock steel pipe pile can realize reliable lock connection between adjacent main steel pipes, thereby ensuring the reliability of the connection between the adjacent main steel pipes, and also ensuring the sealing performance of the corresponding inner lock steel pipe pile and outer lock steel pipe pile, and simplifying the installation process and improving the installation efficiency.

[0023] 3. The arrangement of the scissors brace enhances the connection strength and stability between the inner lock steel pipe pile and the outer lock steel pipe pile.

[0024] 4. The cofferdam has good water sealing performance, and can resist the buoyancy generated by water pumping in the foundation pit.

[0025] 5. The use of the anchor pulling device effectively enhances the stability and reliability of the composite cofferdam structure.

[0026] 6. The adjusting device enhances the anchoring reliability of the entire composite cofferdam structure.

[0027] 7. The top pressing walkway plate can also be a prefabricated plate with a limiting device, the top pressing device connects the lock steel pipe piles integrally through the limiting device, increases the overall rigidity, and the walkway plate can form a passageway as a passageway in the construction process.

[0028] 8. The steel pipe filling material increases the overall overturning resistance of the cofferdam. BRIEF DESCRIPTION OF DRAWINGS

[0029] The utility model will be further described below in combination with the drawings and examples.

[0030] Figure 1 It is a plan view of the composite cofferdam structure for deep water channel excavation construction of the utility model.

[0031] Figure 2 It is an elevation view of the composite cofferdam structure for deep water channel excavation construction of the utility model.

[0032] Figure 3 It is a schematic view of the scissors brace and the reinforcing rib connecting device of the utility model.

[0033] Figure 4 This is a schematic diagram of the structure of the locking steel pipe pile unit of the utility model.

[0034] Figure 5 This is a diagram of the pile hole excavation process in the construction method of the composite cofferdam structure for deep-water channel expansion construction in this utility model.

[0035] Figure 6 This is a diagram of the pile hole backfilling process in the construction method of the composite cofferdam structure for deep-water channel expansion construction in this utility model.

[0036] Figure 7 This is a diagram of the piling and fixing process of locking steel pipe piles in the construction method of the composite cofferdam structure for deep-water channel expansion and excavation in this utility model.

[0037] Figure 8 This is a diagram showing the installation process of the scissors brace in the construction method of the composite cofferdam structure for deep-water channel expansion construction in this utility model.

[0038] Figure 9 This is a diagram of the filling process between the locking steel pipe piles and the installation process of the top-pressed walkway plate in the construction method of the composite cofferdam structure for deep-water channel expansion construction in this utility model.

[0039] In the figure: first oblique inner locking steel pipe pile 1, first oblique outer locking steel pipe pile 2, embankment 3, inner locking steel pipe pile 4, outer locking steel pipe pile 5, planned excavation area 6, second oblique inner locking steel pipe pile 7, second oblique outer locking steel pipe pile 8, channel 9, structure 10, top pressure walkway plate 11, outer reinforcing rib 12, guy wire hole 32, adjustment device 14, ground anchor 15, inner reinforcing rib 16, scissors brace 17, inter-pile filling 18, pile hole 19, clay 20, cover layer 21, permeable layer 22, impermeable layer 23, steel pipe filling material 24, pin shaft hole 25, locking plate 26, main steel pipe 27, locking pipe 28, locking pipe filling 29, composite cofferdam structure 30, gap 31, guy wire hole 32 DETAILED DESCRIPTION

[0040] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0041] Example 1:

[0042] See also Figures 1-9The utility model provides a kind of deep water channel dredging construction composite cofferdam structure, including being set in channel 9 and located the composite cofferdam structure 30 of peripheral proposed excavation area 6;The composite cofferdam structure 30 includes inside locking steel pipe pile 4 located inside, the outside of inside locking steel pipe pile 4 is provided with outside locking steel pipe pile 5, and the both ends of inside locking steel pipe pile 4 are respectively provided with first oblique inside locking steel pipe pile 1 and second oblique inside locking steel pipe pile 7 between bank 3, and the both ends of outside locking steel pipe pile 5 are respectively provided with first oblique outside locking steel pipe pile 2 and second oblique outside locking steel pipe pile 8 between bank 3.This cofferdam structure can be suitable for deep water channel dredging construction under complex stratum condition, with good structural stability and water sealing performance, not only can ensure the construction safety during deep water channel dredging construction, but also ensure the traffic safety of existing channel;In addition, effectively improve the construction efficiency of channel dredging construction.

[0043] Further, the inside locking steel pipe pile 4, the outside locking steel pipe pile 5, the first oblique inside locking steel pipe pile 1, the first oblique outside locking steel pipe pile 2, the second oblique inside locking steel pipe pile 7 and the second oblique outside locking steel pipe pile 8 all adopt the same structure form, and respectively include main steel pipe 27, the outside wall of main steel pipe 27 is welded and fixed with the locking pipe 28 with notch 31, and the other side of the outside wall of main steel pipe 27 is symmetrically welded and fixed with locking plate 26;Adjacent main steel pipes 27 are locked and matched between locking pipe 28 and locking plate 26.By adopting the above-mentioned locking steel pipe pile, reliable locking connection between adjacent main steel pipes 27 can be realized, thereby ensuring the reliability of the connection between adjacent main steel pipes 27, and at the same time ensuring the sealing performance of the corresponding inside locking steel pipe pile 4 and outside locking steel pipe pile 5, while simplifying the installation process and improving the installation efficiency.

[0044] Further, the locking pipe 28 is made of steel pipe cutting, and the locking plate 26 is made of I-beam cutting.

[0045] Further, when installing, one end of the locking plate 26 is inserted into the inside of the locking pipe 28 from the notch 31.

[0046] The locking steel pipe pile is drilled by rotary drilling, vibrated into a pile, closed by clay, and must be buried below the impermeable layer.

[0047] Further, the gap in the inside of the locking pipe 28 is filled with locking pipe filler 29, and the locking pipe filler 29 is made of clay, sawdust or compressible plastic strip.

[0048] Further, the outer reinforcing ribs 12 and the inner reinforcing ribs 16 are symmetrically welded and fixed on the upper outer wall of the inner locking steel pipe pile 4, the outer locking steel pipe pile 5, the first inclined inner locking steel pipe pile 1, the first inclined outer locking steel pipe pile 2, the second inclined inner locking steel pipe pile 7 and the second inclined outer locking steel pipe pile 8, the pin shaft holes 25 are processed on the inner reinforcing ribs 16 at certain intervals, the scissors braces 17 arranged in cross are hinged between the inner reinforcing ribs 16 located between the inner locking steel pipe pile 4 and the outer locking steel pipe pile 5, the two ends of the scissors braces 17 are hinged and connected with the corresponding pin shaft holes 25, and the end of the pin shaft is provided with a safety card. Through the arrangement of the scissors braces 17, the connection strength and stability between the inner locking steel pipe pile 4 and the outer locking steel pipe pile 5 are enhanced.

[0049] Further, the bottom end of the main steel pipe 27 is embedded in the inside of the pile hole 19, the pile hole 19 sequentially penetrates the cover layer 21, the water permeable layer 22 and the impermeable layer 23 of the channel 9, and the pile hole 19 penetrates into the inside of the impermeable layer 23 by at least 5m. Through the above-mentioned depth arrangement, the seepage at the bottom is prevented.

[0050] Further, the gap between the main steel pipe 27 and the pile hole 19 is closed by the clay 20. The clay 20 ensures that the cofferdam has good water sealing performance, and at the same time resists the buoyancy generated by the water pumping in the foundation pit.

[0051] Further, the cavity between the inner locking steel pipe pile 4 and the outer locking steel pipe pile 5 is filled with the pile filling 18. The pile filling 18 ensures that the cofferdam has good water sealing performance, and at the same time resists the buoyancy generated by the water pumping in the foundation pit.

[0052] Further, the pile filling 18 adopts clay. The sealing effect is ensured by using clay.

[0053] Further, the outer reinforcing ribs 12 are provided with the pull line holes 32 at certain intervals, the pull anchor device is connected on the pull line hole 32; the pull anchor device comprises the pull line 13, one end of the pull line 13 is connected with the pull line hole 32, the other end is connected with the ground anchor 15 arranged on the natural foundation, and the adjusting device 14 for adjusting the tension degree is arranged in the middle of the pull line 13. The stability and reliability of the composite cofferdam structure 30 are effectively enhanced by using the pull anchor device.

[0054] Further, the adjusting device 14 is provided with a tension sensor inside, the influence of water level change on the pull line 13 is sensed through the tension sensor, the stress of the pull line 13 is avoided to be broken or the stress is avoided to be too small to cause the instability of the cofferdam, the tension of the pull line 13 is adjusted through the adjusting device 14, the tension is avoided to be too large or too small, and the tension is controlled within a suitable threshold. The anchoring reliability of the whole composite cofferdam structure 30 is enhanced through the above-mentioned adjusting device 14.

[0055] Furthermore, a top-pressing walkway plate 11 is provided on top of the inner locking steel pipe pile 4, the outer locking steel pipe pile 5, the first oblique inner locking steel pipe pile 1, the first oblique outer locking steel pipe pile 2, the second oblique inner locking steel pipe pile 7, and the second oblique outer locking steel pipe pile 8. The top-pressing walkway plate 11 can also be a prefabricated plate with a limiting device. The top-pressing device connects the locking steel pipe piles as a whole through the limiting device to increase the overall rigidity. At the same time, the walkway plate can form a passage as a passage during the construction process.

[0056] Furthermore, a steel pipe filler 24 is provided inside the main steel pipe 27. The steel pipe filler 24 is made of sand, pebbles or gravel. The steel pipe filler 24 increases the overall resistance of the cofferdam to overturning force.

[0057] Example 2:

[0058] A construction method for a composite cofferdam structure for deepwater channel expansion and excavation, comprising the following steps:

[0059] Step 1, excavation of pile hole 19:

[0060] Set up the guide frame, use the rotary drilling rig to drill the foundation of the channel 9, and ensure that the depth of the pile hole 19 finally formed must enter a certain depth inside the impermeable layer 23;

[0061] Step 2, backfilling of pile hole 19:

[0062] The clay 20 is transported to the vicinity of the opening of the pile hole 19 by ship, and then the clay 20 is backfilled into the pile hole 19;

[0063] Step 3: Piling and fixing of locking steel pipe piles:

[0064] The locking steel pipe piles are prefabricated in advance at the arrangement side, and the locking steel pipe piles are driven in by a vibration hammer suspended by a lifting device, using the vibration pile-making process;

[0065] Step 4, installation of scissors support 17:

[0066] The outer reinforcement ribs 12 are fixed on the outer side of the locking steel pipe piles, and the inner reinforcement ribs 16 are fixed on the inner side of the locking steel pipe piles. Then, the scissor braces 17 are hinged between the inner reinforcement ribs 16 through the pin shaft, thereby connecting all the locking steel pipe piles into a whole.

[0067] Step 5, installation of anchor device:

[0068] Connect an anchor device to the outer reinforcement rib 12 of the locking steel pipe pile;

[0069] Step 6, filling of locking steel pipe piles:

[0070] After all the locking steel pipe piles are fixed, the interior of the main steel pipe 27 is backfilled with steel pipe filling 24, and the interior of the locking pipe 28 is backfilled with locking pipe filling 29;

[0071] Step 7, filling between locking steel pipe piles:

[0072] The interior between the inner locking steel pipe pile 4 and the outer locking steel pipe pile 5 is filled with pile filling 18;

[0073] Step 8, installation of the capping walkway plate 11:

[0074] The capping walkway plate 11 is fixedly installed on the top of the locking steel pipe pile;

[0075] Step 9, pumping of the foundation pit:

[0076] After the entire composite cofferdam structure 30 and the embankment 3 are sealed, the interior of the closed area of the foundation pit is pumped until a water-free construction area is formed, creating a water-free environment for the proposed excavation area 6.

Claims

1. A composite cofferdam structure for deepwater channel expansion and construction, characterized in that: It includes a composite cofferdam structure (30) arranged on the waterway (9) and located outside the proposed excavation area (6); The composite cofferdam structure (30) comprises an inner locking steel pipe pile (4) located on the inner side, an outer locking steel pipe pile (5) is arranged on the outer side of the inner locking steel pipe pile (4), a first oblique inner locking steel pipe pile (1) and a second oblique inner locking steel pipe pile (7) are respectively arranged between the two ends of the inner locking steel pipe pile (4) and the embankment (3), and a first oblique outer locking steel pipe pile (2) and a second oblique outer locking steel pipe pile (8) are respectively arranged between the two ends of the outer locking steel pipe pile (5) and the embankment (3).

2. A composite cofferdam structure for deepwater channel expansion construction according to claim 1, characterized in that: The inner locking steel pipe pile (4), the outer locking steel pipe pile (5), the first oblique inner locking steel pipe pile (1), the first oblique outer locking steel pipe pile (2), the second oblique inner locking steel pipe pile (7) and the second oblique outer locking steel pipe pile (8) all adopt the same structural form and respectively include a main steel pipe (27), a locking pipe (28) with a notch (31) is welded and fixed on the outer wall of the main steel pipe (27), and a locking plate (26) is symmetrically welded and fixed on the other side of the outer wall of the main steel pipe (27); adjacent main steel pipes (27) are locked and matched between the locking pipe (28) and the locking plate (26).

3. The composite cofferdam structure for deepwater channel expansion construction according to claim 2, characterized in that: The locking tube (28) is made by cutting a steel pipe, and the locking plate (26) is made by cutting an I-beam; During installation, one end of the locking plate (26) is inserted into the interior of the locking tube (28) through the notch (31); The internal space of the locking tube (28) is filled with a locking tube filler (29), and the locking tube filler (29) is made of clay, sawdust or compressible plastic strips.

4. The composite cofferdam structure for deepwater channel expansion construction according to claim 2, characterized in that: Outer reinforcement ribs (12) and inner reinforcement ribs (16) are symmetrically welded and fixed on the upper outer walls of the inner locking steel pipe pile (4), the outer locking steel pipe pile (5), the first oblique inner locking steel pipe pile (1), the first oblique outer locking steel pipe pile (2), the second oblique inner locking steel pipe pile (7) and the second oblique outer locking steel pipe pile (8), the inner reinforcement ribs (16) are processed with pin holes (25) at certain intervals, and cross-arranged scissor struts (17) are hinged between the inner reinforcement ribs (16) located between the inner locking steel pipe pile (4) and the outer locking steel pipe pile (5), and the two ends of the scissor struts (17) are hingedly connected to the corresponding pin holes (25) through pins, and the ends of the pins are provided with safety cards.

5. The composite cofferdam structure for deepwater channel expansion construction according to claim 2, characterized in that: The bottom end of the main steel pipe (27) is buried inside the pile hole (19), and the pile hole (19) sequentially passes through the covering layer (21), the permeable layer (22) and the impermeable layer (23) of the waterway (9), and the pile hole (19) penetrates into the impermeable layer (23) by at least 5m; The gap between the main steel pipe (27) and the pile hole (19) is sealed by clay (20).

6. The composite cofferdam structure for deepwater channel expansion construction according to claim 2, characterized in that: The cavity between the inner locking steel pipe pile (4) and the outer locking steel pipe pile (5) is filled with an inter-pile filler (18); The inter-pile filling material (18) is made of clay.

7. The composite cofferdam structure for deepwater channel expansion construction according to claim 4, characterized in that: The outer reinforcing rib (12) is provided with wire holes (32) at regular intervals, and the wire holes (32) are connected to anchor devices; The anchoring device includes a tension wire (13), one end of the tension wire (13) is connected to the tension wire hole (32), and the other end is connected to the ground anchor (15) set on the natural foundation, and an adjustment device (14) for adjusting the tension degree is set in the middle of the tension wire (13); A tension sensor is provided inside the regulating device (14), and the tension sensor senses the influence of water level changes on the pull line (13), thereby preventing the pull line (13) from breaking due to excessive stress or from becoming unstable due to insufficient stress. The tension of the pull line (13) is adjusted by the regulating device (14), thereby preventing the tension from exceeding the standard or being too insufficient, and controlling the tension within a suitable threshold.

8. The composite cofferdam structure for deepwater channel expansion construction according to claim 2, characterized in that: A top-pressing walkway plate (11) is provided on the tops of the inner locking steel pipe pile (4), the outer locking steel pipe pile (5), the first oblique inner locking steel pipe pile (1), the first oblique outer locking steel pipe pile (2), the second oblique inner locking steel pipe pile (7) and the second oblique outer locking steel pipe pile (8).

9. The composite cofferdam structure for deepwater channel expansion construction according to claim 2, characterized in that: A steel pipe filler (24) is provided inside the main steel pipe (27), and the steel pipe filler (24) is made of sand, pebbles or gravel.

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