Construction structure of complex riverbed steel pipe pile combined cofferdam

Abstract

The utility model relates to a construction structure of a complex riverbed steel pipe pile combined cofferdam. According to the scheme, the construction structure comprises a grooving guide frame and a drilling platform; the heightening steel casing system is welded on the steel casing; the assembled insertion type section steel hanging system comprises a top supporting frame formed by splicing a plurality of layers of ring beams, inner supports, a plurality of pieces of second section steel and a plurality of pieces of third section steel, hanging devices installed at the ends of the second section steel and the ends of the third section steel and hanging rods penetrating through the first layer of ring beams, and the assembled insertion type section steel hanging system is hung above a steel casing through the hanging rods. A hollow hydraulic jack; the multi-layer guide frame system comprises inner side guide frames and two layers of outer side guide frames erected on Bailey beams of a trestle and brackets welded to steel pipe piles, and the inner side guide frames are two layers of ring beams in hanging; the movable guide frame is located above the multi-layer guide frame system; a water stop wall; a precipitation well; an inner support efficient support changing device position; and prefabricating a bottom sealing concrete bottom plate.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge engineering, in particular to a complex riverbed steel pipe pile combined cofferdam construction structure. Background Art

[0002] With the development and construction of long-span bridges, more and more bridge foundation projects need to be constructed under conditions of large water level changes and complex geological conditions, and must be carried out in a waterless environment. The construction method generally used in bridge foundation construction is to build temporary maintenance structures to form a water-proof environment. Temporary retaining structures generally use steel sheet pile cofferdams, steel pipe pile cofferdams, steel box cofferdams and other types. The form of the cofferdam needs to be determined based on factors such as climate and water level characteristics and stratum lithology. Especially for construction conditions with complex geological lithology and frequent water level changes, the use of conventional steel pipe pile cofferdam construction methods is prone to problems such as low construction efficiency and difficulty.

[0003] Therefore, there is an urgent need for a steel pipe pile combined cofferdam construction structure that can provide a complex riverbed to meet the needs of constructing steel pipe pile cofferdams in complex construction environments. Utility Model Content

[0004] The purpose of this application is to provide a complex riverbed steel pipe pile combined cofferdam construction structure in order to solve the above problems existing in the prior art.

[0005] In order to achieve the above application purpose, the present application adopts the following technical solutions: The complex riverbed steel pipe pile combined cofferdam construction structure includes a groove guide frame and a drilling platform, and also includes:

[0006] The height-connecting steel casing system is welded to the steel casing and fixed for the second time by pouring concrete to achieve the height connection of the steel casing;

[0007] Assemble the inserted steel hanging system, including a multi-layer ring beam, an inner support, a top support frame formed by splicing multiple second steels and multiple third steels, a suspension device installed at the ends of the second steel and the third steel, and a hanger passing through the first ring beam, and hanging above the steel casing through the hanger;

[0008] Hollow hydraulic jack, used to lower the ring beam;

[0009] The multi-layer guide frame system includes an inner guide frame and two outer guide frames mounted on the Bailey beam of the trestle and the braces welded on the steel pipe piles. The inner guide frame is a two-layer ring beam in the hanging;

[0010] A movable guide frame located above the multi-layer guide frame system;

[0011] The water stop wall is formed by pouring underwater concrete inside and outside the cofferdam after the steel pipe piles are driven;

[0012] The dewatering well is set in the steel pipe pile to drain the water inside the steel pipe and cofferdam;

[0013] Internal support efficient support replacement device, used to shift the horizontal or diagonal support of the assembled plug-in steel suspension system;

[0014] Prefabricated bottom concrete slab is used as the bottom cover of the cofferdam.

[0015] Furthermore, the connecting steel casing system includes a first steel section, a receiving steel plate, and a circular steel plate support. The bottom of the first steel section is connected to the receiving steel plate, and the connection is strengthened by stiffening ribs. The circular steel plate support is welded to the top of the first steel section, and the connection is strengthened by stiffening ribs. The receiving steel plate connected to the first steel section is welded in the steel casing. The first steel section and the receiving steel plate built into the steel casing are poured with concrete to fix the connecting steel casing system on the steel casing.

[0016] Furthermore, a slot is provided at the bottom of the movable guide frame, which fits the ring beam and the top of the outer guide frame, and a semicircular groove is provided on the inner side of the movable guide frame, and a lock is provided in the groove to control the direction.

[0017] Furthermore, the precipitation well includes a well pipe, a drainage pipe, clay balls, clay, gravel, a filter and a water pump. The clay balls, clay and gravel are filled in the well pipe in sequence from top to bottom. The well pipe extends out of the steel pipe piles and passes through the waterproof layer. A filter is arranged at the bottom of the well pipe.

[0018] Furthermore, the inner support efficient support replacement device is fixed to the inner support end in the form of a hoop, the upper hoop and the lower hoop are integrated, and the outer diameter of the lower hoop is larger than that of the upper hoop.

[0019] Furthermore, two support bars connected by a reinforcement plate are provided at the bottom of the lower hoop, and the two support bars are distributed on the upper and lower sides of the ring beam. Two double support bars are provided on each side, and a first limiting plate is provided at the end of the support bar. A second limiting plate and two vertical pulleys are installed on both sides of the vertical pulley through a second pin shaft. The first pin shaft passes through the second limiting plate to fix the vertical pulley to the end of the support bar, and guide wheels are installed on both sides of the vertical pulley on the upper part of the ring beam.

[0020] Furthermore, an inclined rod is provided at the bottom of the lower clamp, which is distributed on both sides of the inner support. A support plate is provided at the end of the inclined rod, and three horizontal pulleys are installed on the support plate. A connecting rod is longitudinally provided on the support bar at the upper part of the ring beam and distributed at both ends of the support bar, and a pull rod is horizontally provided on the upper part of the connecting rod.

[0021] Furthermore, the prefabricated bottom sealing concrete bottom plate is composed of a first prefabricated bottom plate, a second prefabricated bottom plate and a third prefabricated bottom plate, and each prefabricated bottom sealing concrete bottom plate is provided with lifting ears around the top.

[0022] Compared with the prior art, the beneficial effects of the utility model are:

[0023] 1. Aiming at the situation of steel pipe piles being driven into hard rock, the utility model adopts the technology of impact drilling and grooved concrete water stop wall to drive the steel pipe piles, thus reducing the construction difficulty;

[0024] 2. The utility model adopts the hole-drawing bag sand pile replacement technology to avoid rapid erosion of sand filling and improve the stability of steel pipe piles;

[0025] 3. The utility model adopts a movable guide device to repeatedly and continuously drive steel pipe piles, thereby improving the speed and accuracy of driving steel pipe piles;

[0026] 4. The utility model is provided with an efficient internal support replacement device, which efficiently completes the support system conversion and solves the risks caused by the removal of the internal support;

[0027] 5. The utility model adopts an inserted steel hanging system, and realizes the maximum utilization of the steel casing by the reverse method of first internal support and then cofferdam;

[0028] 6. The utility model adopts a multi-layer guide frame system to accurately control the driving direction of steel pipe piles, thereby improving the construction quality of steel cofferdams;

[0029] 7. The utility model utilizes prefabricated assembled bottom sealing concrete to complete the bottom sealing of the cofferdam, thus simplifying the on-site construction steps and accelerating the construction efficiency.

[0030] 8. This utility model adopts the technology of built-in dewatering well with steel pipe piles, external blocking and internal dewatering without bottom sealing, which realizes the rapid dewatering of the cofferdam and reduces the difficulty of construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is the plan view of steel pipe pile driving;

[0032] Figure 2 This is the side view of the inserted steel section high hanging system;

[0033] Figure 3 It is the cross-section of the steel pipe pile composite cofferdam;

[0034] Figure 4 is a cross-sectional view of the installation of the movable guide frame;

[0035] Figure 5 It is a stereogram of the installation of the movable guide frame;

[0036] Figure 6 This is a schematic diagram of bag filling construction;

[0037] Figure 7 This is the structural diagram of the built-in dewatering well in steel pipe piles;

[0038] Figure 8 It is a side view of the inner support replacement device;

[0039] Fig. 9 It is the internal support that is replaced with the plan view of the device;

[0040] Fig.10 It is a three-dimensional diagram of the precast concrete base plate.

[0041] In the figure, 1, steel pipe pile; 2, hole forming; 3, ring beam; 4, outer guide frame; 5, movable guide frame; 6, high steel casing system; 7, first steel; 8, receiving steel plate; 9, round steel plate support; 10, concrete; 11, stiffening rib; 12, second steel; 13, third steel; 14, connection system; 15, suspension device; 16, steel casing; 17, bracket; 18, suspension rod; 19, high-strength nut; 20, hollow hydraulic jack; 21, water stop wall; 22, precipitation well; 23, lock mouth; 24, annular cloth bag; 25, well pipe; 26, drainage pipe; 27, Clay ball; 28. Clay; 29. ​​Gravel; 30. Filter; 31. Water pump; 32. Inner support; 33. Upper clamp; 34. Lower clamp; 35. Support bar; 36. Reinforcement plate; 37. First limit plate; 38. First pin; 39. Second limit plate; 40. Second pin; 41. Vertical pulley; 42. Guide wheel; 43. Horizontal pulley; 44. Diagonal rod; 45. Support plate; 46. Connecting rod; 47. Pull rod; 48. First precast base plate; 49. Second precast base plate; 50. Third precast base plate; 51. Lifting ear; 52. Precast bottom concrete base plate. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of this application.

[0043] Those skilled in the art should understand that, in the disclosure of the present application, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present application.

[0044] Example 1

[0045] like Figure 1-10 As shown, the complex riverbed steel pipe pile combined cofferdam construction structure includes a groove guide frame and a drilling platform. The groove guide frame and the drilling platform are both existing technologies, and their structures and principles are not described here. They also include:

[0046] The height-connecting steel casing system 6 is welded to the steel casing 16 and fixed for a second time by pouring concrete 10 to achieve the height connection of the steel casing 16;

[0047] Assemble the inserted steel hanging system, including a multi-layer ring beam 3, an inner support 32, a plurality of second steels 12, a plurality of third steels 13 spliced ​​together to form a top support frame, a suspension device 15 installed at the ends of the second steels 12 and the third steels 13, and a hanger 18 passing through the first ring beam 3, and hanging above the steel casing 16 through the hanger 18;

[0048] A hollow hydraulic jack 20, used for lowering the ring beam 3;

[0049] The multi-layer guide frame system includes an inner guide frame and two outer guide frames 4 mounted on the Bailey beam of the trestle and the brace legs 17 welded on the steel pipe piles, and the inner guide frame is a two-layer ring beam 3 in the hanging;

[0050] A movable guide frame 5, located above the multi-layer guide frame system, for the steel pipe piles 1;

[0051] The water stop wall 21 is formed by pouring underwater concrete inside and outside the cofferdam after the steel pipe pile 1 is driven;

[0052] A dewatering well 22 is provided in the steel pipe pile 1 and is used to drain the water inside the steel pipe and the cofferdam;

[0053] Internal support efficient support replacement device, used to shift the horizontal or diagonal support of the assembled plug-in steel suspension system;

[0054] The prefabricated bottom sealing concrete bottom plate 52 is used as the bottom sealing of the cofferdam.

[0055] Example 2

[0056] Through the construction structure construction of Example 1, the specific steps include:

[0057] Step 1: Impact drill groove and hole: first set up the groove guide frame, lower the steel casing with crawler crane, use impact drill to break the hard rock and make a groove. Figure 6 As shown, the annular cloth bags 24 filled with sand are lowered one by one to prevent the rapid current from scouring the sand filling.

[0058] Step 2, connecting the steel casing: weld the first steel 7, the receiving steel plate 8, and the circular steel plate 9 to form a connecting steel casing system 6, weld the connecting steel casing system 6 to the steel casing 16, and then use concrete pouring 10 to perform secondary reinforcement to complete the connecting of the steel casing 16.

[0059] Specifically, Figure 1-2As shown, the connecting steel casing system 6 includes a first steel section 7, a receiving steel plate 8, and a circular steel plate support 9. The bottom of the first steel section 7 is connected to the receiving steel plate 8 by welding, and the connection is strengthened by stiffening ribs 11. The circular steel plate support 9 is welded to the top of the first steel section 7, and the connection is also strengthened by stiffening ribs 11. The receiving steel plate 8 connected to the first steel section 7 is welded to the steel casing 16, and then the first steel section 7 and the receiving steel plate 8 built into the steel casing 16 are poured with concrete 10 to fix the connecting steel casing system 6 on the steel casing 16.

[0060] Step 3: Assemble the inserted steel hanging system: Assemble the first ring beam 3 and the inner support 32 on the drilling platform, and then use the connection system 14 to install the second ring beam 3, and then horizontally set the second steel 12 on the circular steel support plate 9, and then vertically set the third steel 13 on the second steel 12 to form a top support frame. The ends of the second steel 12 and the third steel 13 are both installed with suspension devices 15, and the suspension rod 18 passes through the first ring beam 3, is tightened with a high-strength nut 19, and is hung above the steel casing 16 to complete the inserted steel hanging system;

[0061] Step 4: Lowering the ring beam: After dismantling the drilling platform, use the hollow hydraulic jack 20 to lower the ring beam to the specified position.

[0062] Step 5: Setting up the guide frame: Use the two layers of ring beams 3 as the inner guide frame, weld the brackets 17 on the Bailey beams and steel pipe piles of the trestle, set up the two layers of outer guide frames 4, and form a multi-layer guide frame system.

[0063] Step 6: Driving steel pipe piles: Place the movable guide frame 5 directly above the inner and outer guide frames, and drive the steel pipe piles 1 in the guide frames in sequence along the direction of the movable guide frame 5 until they are closed. After all the steel pipe piles 1 are driven, Figure 3 As shown, underwater concrete is poured inside and outside the cofferdam to form a water stop wall 21, and then a dewatering well 22 is set in the steel pipe pile 1.

[0064] Specifically, Figure 4-5 As shown, a slot is provided at the bottom of the movable guide frame 5, which fits the ring beam 3 and the top of the outer guide frame 4, and is placed on the inner and outer guide frames. A semicircular groove is provided on the inner side of the movable guide frame 5, and a lock 23 is provided in the groove to control the direction. The steel pipe pile 1 is inserted downward close to the movable guide frame 5;

[0065] Specifically, Figure 7 As shown, a dewatering well 22 is arranged inside the steel pipe pile. The dewatering well 22 comprises a well pipe 25, a drainage pipe 26, clay balls 27, clay 28, gravel 29, a filter screen 30 and a water pump 31. The clay balls 27, clay 28 and gravel 29 are filled with the filling materials from top to bottom in sequence. The well pipe 25 extends out of the steel pipe pile 1 and passes through the waterproof layer. A filter screen 30 is arranged at the bottom of the well pipe 25 to filter silt, sediment and the like.

[0066] Step 7: Installation and replacement of internal supports: Install the suspended internal supports on the driven steel pipe piles, use the internal support efficient replacement device to shift one of the horizontal or diagonal supports, and improve the bearing capacity of the internal support through system conversion.

[0067] Specifically, Figure 8-9 As shown, the inner support efficient support replacement device is fixed to the end of the inner support 32 in the form of a hoop, the upper hoop 33 and the lower hoop 34 are integrated, and the outer diameter of the lower hoop 34 is larger than the upper hoop 33. The two support bars 35 are connected by a reinforcing plate 36, and then the double-jointed support bars 35 are set at the bottom of the lower hoop 34, distributed on the upper and lower sides of the ring beam 3, and two double-jointed support bars 35 are set on each side. A first limit plate 37 is set at the end of the support bar 35, and a second limit plate 39 is installed on both sides of the vertical pulley 41 through a second pin shaft 40 and the two vertical pulleys 41 are connected, and then the first pin shaft 38 passes through the second limit plate 39, so that the vertical pulley 41 is fixed to the end of the support bar 35, and guide wheels 42 are installed on both sides of the vertical pulley 41 on the upper part of the ring beam 3. An oblique rod 44 is arranged at the bottom of the lower hoop 34, distributed on both sides of the inner support 32, a support plate 45 is arranged at the end of the oblique rod 44, and a second limit plate 39 is installed on both sides of the horizontal pulley 43 through a second pin shaft 40 to connect the three horizontal pulleys 43. A connecting rod 46 is longitudinally arranged on the upper support bar 35 of the ring beam 3 and distributed at both ends of the support bar 35, and a pull rod 47 is transversely arranged on the upper part of the connecting rod 46.

[0068] Step 8, cofferdam bottom sealing: drain the water inside the steel pipe and the cofferdam through the precipitation well 22 in the steel pipe pile 1, install the third ring beam 3, and then hang the prefabricated bottom sealing concrete bottom plate 52 designed by block assembly, and complete the overall assembly by pouring wet joint process;

[0069] Specifically, Fig.10 As shown, the prefabricated bottom concrete slab 52 is composed of a first prefabricated bottom slab 48, a second prefabricated bottom slab 49 and a third prefabricated bottom slab 50. Lifting ears 51 are arranged around the top of each prefabricated bottom concrete slab 52, and a crane is used to lower the prefabricated bottom concrete slabs in sequence.

[0070] The parts not described in detail in this application are prior art, so this application does not describe them in detail.

[0071] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0072] Although this article uses more professional terms, it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of this application; interpreting them as any additional restrictions is contrary to the spirit of this application.

[0073] The present application is not limited to the above-mentioned optimal implementation mode. Anyone can derive other forms of products under the inspiration of the present application. However, no matter what changes are made in the shape or structure, any technical solution that is the same or similar to that of the present application falls within the protection scope of the present application.

Claims

1. A complex riverbed steel pipe pile combined cofferdam construction structure, including a groove guide frame and a drilling platform, characterized in that: Also includes: The steel casing system (6) is welded to the steel casing (16) and fixed for a second time by pouring concrete (10) to achieve the height connection of the steel casing (16); An assembled plug-in steel hanging system comprises a multi-layer ring beam (3), an inner support (32), a plurality of second steels (12), a top support frame formed by splicing a plurality of third steels (13), a hanging device (15) installed at the ends of the second steels (12) and the third steels (13), and a hanging rod (18) passing through the first ring beam (3), and hanging above the steel casing (16) through the hanging rod (18); A hollow hydraulic jack (20) for lowering the ring beam (3); The multi-layer guide frame system comprises an inner guide frame and two outer guide frames (4) mounted on the Bailey beam of the trestle and the braces (17) welded on the steel pipe piles, wherein the inner guide frame is a two-layer ring beam (3) in the hanging; A movable guide frame (5) is located above the multi-layer guide frame system; The water stop wall (21) is formed by pouring underwater concrete inside and outside the cofferdam after the steel pipe piles (1) are driven in. A drainage well (22) is provided in the steel pipe pile (1) and is used to drain water from the steel pipe and the cofferdam; Internal support efficient support replacement device, used to shift the horizontal or diagonal support of the assembled plug-in steel suspension system; The prefabricated bottom sealing concrete bottom plate (52) is used as the bottom sealing of the cofferdam.

2. The complex riverbed steel pipe pile combined cofferdam construction structure according to claim 1 is characterized in that: The connecting steel casing system (6) comprises a first steel section (7), a receiving steel plate (8), and a circular steel plate support (9); the bottom of the first steel section (7) is connected to the receiving steel plate (8), and the connection is strengthened by a stiffening rib (11); the circular steel plate support (9) is welded to the top of the first steel section (7), and the connection is strengthened by a stiffening rib (11); the receiving steel plate (8) connected to the first steel section (7) is welded to the steel casing (16); the first steel section (7) and the receiving steel plate (8) built into the steel casing (16) are poured with concrete (10) to fix the connecting steel casing system (6) to the steel casing (16).

3. The complex riverbed steel pipe pile combined cofferdam construction structure according to claim 1 is characterized in that: The movable guide frame (5) has a slot at its lower portion, the slot being fitted with the ring beam (3) and the top of the outer guide frame (4), and a semicircular groove is provided on the inner side of the movable guide frame (5), a locking opening (23) is provided in the groove for controlling the direction.

4. The complex riverbed steel pipe pile combined cofferdam construction structure according to claim 1 is characterized in that: The precipitation well (22) comprises a well pipe (25), a drainage pipe (26), clay balls (27), clay (28), gravel (29), a filter screen (30) and a water pump (31). The clay balls (27), clay (28) and gravel (29) are sequentially filled in the well pipe (25) from top to bottom. The well pipe (25) extends out of the steel pipe pile (1) and passes through the waterproof layer. The filter screen (30) is arranged at the bottom of the well pipe (25).

5. The complex riverbed steel pipe pile combined cofferdam construction structure according to claim 1 is characterized in that: The inner support efficient support replacement device is fixed to the end of the inner support (32) in the form of a hoop, the upper hoop (33) and the lower hoop (34) are integrated, and the outer diameter of the lower hoop (34) is larger than that of the upper hoop (33).

6. The complex riverbed steel pipe pile combined cofferdam construction structure according to claim 5 is characterized in that: Two support bars (35) connected by a reinforcing plate (36) are provided at the bottom of the lower hoop (34), and the two support bars (35) are distributed on the upper and lower sides of the ring beam (3), and two double support bars (35) are provided on each side. A first limiting plate (37) is provided at the end of the support bar (35), and a second limiting plate (39) and two vertical pulleys (41) are installed on both sides of the vertical pulley (41) through a second pin shaft (40), and the first pin shaft (38) passes through the second limiting plate (39) to fix the vertical pulley (41) to the end of the support bar (35), and guide wheels (42) are installed on both sides of the vertical pulley (41) on the upper part of the ring beam (3).

7. The complex riverbed steel pipe pile combined cofferdam construction structure according to claim 6 is characterized in that: The bottom of the lower hoop (34) is provided with an inclined rod (44), and the inclined rod (44) is distributed on both sides of the inner support (32). The end of the inclined rod (44) is provided with a support plate (45), and three horizontal pulleys (43) are installed on the support plate (45). The support bar (35) on the upper part of the ring beam (3) is longitudinally provided with a connecting rod (46) and distributed at both ends of the support bar (35). A pull rod (47) is transversely provided on the upper part of the connecting rod (46).

8. The complex riverbed steel pipe pile combined cofferdam construction structure according to any one of claims 1 to 7, characterized in that: The prefabricated bottom sealing concrete bottom plate (52) is composed of a first prefabricated bottom plate (48), a second prefabricated bottom plate (49) and a third prefabricated bottom plate (50), and each prefabricated bottom sealing concrete bottom plate (52) is provided with hanging ears (51) around the top.

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