Steel hanging box construction method

Abstract

The present application relates to a hanging box construction method, comprising: constructing steel pipe piles; connecting extension casings to the tops of steel casings; passing support legs through the extension casings, hoisting cross beams and lowering same onto the support legs; mounting bottom plates on the cross beams; mounting a cofferdam cylinder, mounting supports and steel cables; lowering a cofferdam: removing the cross beams and the support legs, and moving the steel cables to lower the bottom plates and the cofferdam cylinder along the steel casings; after same are lowered to a fixed position, welding and fixing anti-shear keys onto the steel casings; removing the extension casings, the steel cables and the supports; pumping out water from the cofferdam cylinder; mounting formworks on the bottom plates, tying steel bars and pouring concrete; and removing the cofferdam cylinder, side bottom plates and a middle bottom plate.

Description

Steel hanging box construction method

[0001] The present application claims priority to the Chinese patent application No. 202411721023.1, filed on November 28, 2024, and entitled "Circular detachable steel-mix bottom plate steel hanging box construction method", the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application belongs to the technical field of underwater foundation construction, in particular relates to a steel hanging box construction method. BACKGROUND

[0003] The steel-mix bottom plate steel hanging box is a cofferdam technology used for high-pile cap construction in the construction of a cross-sea bridge. It is mainly used for the construction of a high-pile cap. The high-pile cap is a pile foundation structure composed of a plurality of piles and a cap on the top of the water surface. The pile and the cap are mostly made of steel cable concrete and are widely used in bridge foundation engineering.

[0004] The current steel-mix bottom plate steel hanging box construction method uses steel-mix bottom plate and cylindrical structures during the construction process. It is mainly used to form a cofferdam and can pass through the concrete inside to form a cap. However, in the prior art, after the construction is completed and the cap is formed, the steel-mix bottom plate is located at the bottom of the cap, causing waste and increasing costs. SUMMARY

[0005] In view of some deficiencies in the prior art, the present application provides a steel hanging box construction method, which can solve the technical problem of high cost in the prior art.

[0006] The steel hanging box construction method provided by the present application comprises:

[0007] S100, steel pipe pile construction: installing a steel casing and injecting concrete into it;

[0008] S200, installing a high-connection casing: connecting a high-connection casing to the top of each steel casing;

[0009] S300, installing a cross beam: passing a support foot through each high-connection casing; lifting a cross beam and lowering it from top to bottom onto the corresponding support foot;

[0010] S400, installing an integral bottom plate:

[0011] The concrete bottom plate is respectively sleeved into each high-connection casing from top to bottom, and the number of concrete bottom plates is equal to the number of high-connection casings / steel casings;

[0012] The middle bottom plate is inserted between the two adjacent high-connection casings and located between the concrete bottom plates; and the middle bottom plate is spliced with the concrete bottom plates;

[0013] The two side bottom plates are respectively arranged on the two sides of the middle bottom plate to splice the two sides of the middle bottom plate; each side bottom plate has a receiving cavity capable of receiving the concrete bottom plate and splicing the concrete bottom plate;

[0014] The concrete bottom plate, the middle bottom plate and the side bottom plate are spliced into the integral bottom plate and are located on the cross beam;

[0015] S500, installing the cofferdam cylinder and the support and the steel cable: hoisting the cofferdam cylinder and sleeving the cofferdam cylinder into the high connection cylinder from top to bottom, connecting the bottom of the cofferdam cylinder with the integral bottom plate, fixing the support to the top end of the high connection cylinder, and connecting the bottom of the steel cable with the integral bottom plate;

[0016] S600, lowering the cofferdam: removing the cross beam and the support foot; moving the steel cable to lower the integral bottom plate and the cofferdam cylinder along the steel cylinder; and welding and fixing the anti-shear force key on the integral bottom plate with the steel cylinder after being lowered to a fixed position;

[0017] S700, removing the high connection cylinder, the steel cable and the support;

[0018] S800, draining water: pumping out the water in the cofferdam cylinder;

[0019] S900, construction of the pile cap: installing a formwork on the integral bottom plate and installing a steel bar in the formwork to pour concrete;

[0020] S1000, removing:

[0021] The cofferdam cylinder is hoisted and removed from bottom to top;

[0022] The side bottom plate is pulled out in the horizontal direction away from the middle bottom plate;

[0023] The middle bottom plate is pulled out in the horizontal direction from between the steel cylinders.

[0024] In an embodiment, the edge of the concrete bottom plate is outwardly convex with a first clamping strip, and the two sides of the middle bottom plate in the width direction are each provided with a first clamping groove; the first clamping strip can be partially clamped into the first clamping groove;

[0025] The side bottom plate is provided with a second clamping groove on the side used to contact the concrete bottom plate; the side bottom plate is provided with a convex second clamping strip on the side used to contact the middle bottom plate; the first clamping strip can be partially clamped into the second clamping groove; and the second clamping strip can be clamped into the first clamping groove.

[0026] In an embodiment, the integral bottom plate is a circular plate.

[0027] In an embodiment, the integral bottom plate is selected in at least one of the following schemes:

[0028] The first scheme: the middle bottom plate and the side bottom plate are both steel plates; and the concrete bottom plate is a reinforced concrete bottom plate;

[0029] The second scheme is that the concrete bottom plate, the middle bottom plate and the side bottom plate are all reinforced concrete bottom plates.

[0030] In an embodiment, the volume of the middle bottom plate and the side bottom plate are both greater than the total volume of the concrete bottom plate; the total volume of the concrete bottom plate is less than 25% of the total volume of the overall bottom plate, preferably less than 20%.

[0031] In an embodiment, alternatively, the step S500 is: installing the cofferdam cylinder and installing the support and the steel cable: hoisting the cofferdam cylinder and sleeving it into the high-connection cylinder from top to bottom, connecting the bottom of the cofferdam cylinder with the overall bottom plate; fixing the support to the top end of the high-connection cylinder, movably connecting the steel cable with the support, connecting the bottom of the steel cable with the crossbeam; the S600, lowering the cofferdam: removing the support foot; moving the steel cable, so that the crossbeam, the overall bottom plate and the cofferdam cylinder are lowered along the high-connection cylinder / steel cylinder; after being lowered to the fixed position, welding and fixing the anti-shear key with the steel cylinder.

[0032] In an embodiment, the step S100 specifically comprises:

[0033] According to the construction drawing, the holes are punched in the water bottom, the steel cylinder is hoisted and inserted into the corresponding hole from top to bottom, the concrete is poured into the steel cylinder and is waited to solidify.

[0034] In an embodiment, the step S300 comprises a step S310 of installing the support foot; specifically, the support foot is passed through the corresponding hole on the high-connection cylinder; the length of the support foot extending out of the high-connection cylinder on both ends is ensured to be close; the above steps are repeated until the support foot is installed on each high-connection cylinder.

[0035] In an embodiment, after the step S310, there is a step S320 of placing the crossbeam on the support foot: the crossbeam is hoisted by the hoisting equipment, and the crossbeam is ensured to be in a horizontal state; the crossbeam is adjusted, so that the length direction of the crossbeam is perpendicular to the length direction of the support foot; the crossbeam is placed on one side of the high-connection cylinder and above the end of the support foot; the crossbeam is lowered, so that the crossbeam is placed above the support foot.

[0036] In an embodiment, the step S400 more specifically comprises:

[0037] S410, installing the concrete bottom plate: hoisting the concrete bottom plate and sleeving it into the steel cylinder from top to bottom;

[0038] S420, installing the middle bottom plate: hoisting the middle bottom plate, inserting the middle bottom plate into the corresponding two steel cylinders from top to bottom or in a horizontal direction; lowering the middle bottom plate, so that the middle bottom plate falls on the crossbeam; the two sides of the middle bottom plate in the width direction are attached to the side of the concrete bottom plate facing it.

[0039] In an embodiment, the step S400 more specifically comprises:

[0040] S430, installing the side bottom plate: lifting the side bottom plate, aligning the accommodating cavity with the concrete bottom plate from top to bottom or from horizontal direction to the side edge of the middle bottom plate; lowering the side bottom plate on the crossbeam; and tightly attaching the side bottom plate to the concrete bottom plate and the middle bottom plate.

[0041] In an embodiment, the step S700 specifically comprises: manually separating the steel cable from the integral bottom plate; connecting the lifting device to the high-connection pile, lifting the high-connection pile and moving it out.

[0042] In an embodiment, the step S800 comprises a step S810 of: arranging a waterproof membrane bag between the concrete bottom plate and the steel pile, and injecting mortar into the waterproof membrane bag.

[0043] In an embodiment, the step S810 is followed by a step S820 comprising: connecting the input end of the water pumping device to the cofferdam, starting the water pumping device to pump out the water in the cofferdam; manually observing whether there is a water leakage point, and manually filling and sealing if there is a water leakage point.

[0044] In an embodiment, the step S100 is preceded by a step S000 comprising: placing the grouting device, the punching device, the lifting device, the steel pile, the high-connection pile, the supporting foot, the crossbeam, the concrete bottom plate, the middle bottom plate, the side bottom plate and the cofferdam in the construction area.

[0045] The construction method provided by at least one embodiment of the present application divides the integral bottom plate into the concrete bottom plate, the middle bottom plate and the side bottom plate, and the middle bottom plate and the side bottom plate can be removed and reused after construction. The construction cost is saved, and the concrete bottom plate, the middle bottom plate and the side bottom plate are easy and fast to install, thereby improving the construction efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0046] Fig. 1 is a front view of the construction method of an embodiment after the step S300;

[0047] Fig. 2 is a top view of the construction method after the step S300;

[0048] Fig. 3 is a top view of the construction method after the step S400;

[0049] Fig. 4 is an exploded view of the integral bottom plate;

[0050] Fig. 5 is a front view of the construction method after the step S500;

[0051] Fig. 6 is a partial enlarged view of Fig. 5;

[0052] Fig. 7 is a front view of the construction method after the step S900;

[0053] Fig. 8 is a construction flowchart of the construction method of an embodiment.

[0054] In the figure: 100 steel casing; 200 high connection casing; 201 perforation; 300 support foot; 400 crossbeam; 567 integral bottom plate; 500 concrete bottom plate; 501 first clamping strip, 502 through hole; 600 middle bottom plate; 601 first clamping groove; 700 side bottom plate; 701 second clamping groove; 702 second clamping strip; 703 accommodating cavity; 800 cofferdam cylinder; 900 support, 901 upper support, 902 lower support; 110 steel cable, 111 upper nut, 112 lower nut; 120 corbel; 130 counter shear key; 140 jack; 150 support column; 160 pile cap. DETAILED DESCRIPTION

[0055] The technical solutions of the present application will be described in detail below in conjunction with the specific embodiments. However, it should be understood that the elements, structures and features in one embodiment can be beneficially combined into other embodiments without further description.

[0056] In the description of the present application, it should be understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features.

[0057] In the description of the present application, it should be understood that the terms "upper", "lower", "bottom", "inner" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in Figure 5, and are only for the purpose of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0058] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0059] As shown in FIG. 1-8, the first embodiment of the present application provides a construction method of a circular detachable steel-concrete bottom plate (hereinafter referred to as the construction method); the steel hanging box comprises a steel casing 100, a high-connection casing 200, a support leg 300, a cross beam 400, a concrete bottom plate 500, a middle bottom plate 600, two side bottom plates 700 and a cofferdam 800. The number of the steel casing 100 is at least two. The number of the high-connection casing 200 is the same as that of the steel casing 100, and the high-connection casing 200 is connected to the top of the steel casing 100. The support leg 300 is connected to the high-connection casing 200, and the cross beam 400 is arranged on the top of the support leg 300. The number of the concrete bottom plate 500 is the same as that of the steel casing 100, and the concrete bottom plate 500 is sleeved on the corresponding steel casing 100; the concrete bottom plate 500 is arranged on the top of the cross beam 400. The middle bottom plate 600 is arranged on the cross beam 400, and the two sides of the middle bottom plate 600 are attached to the corresponding two concrete bottom plates 500. The side bottom plate 700 is arranged on the cross beam 400, and the side edge of the side bottom plate 700 is attached to the side edge of the middle bottom plate 600. The side bottom plate 700 is provided with a receiving cavity 703 for accommodating the concrete bottom plate 500. The middle bottom plate 600, the side bottom plate 700 and the concrete bottom plate 500 are spliced to form an integral bottom plate 567; and the cofferdam 800 is arranged on the integral bottom plate 567.

[0060] According to the above scheme, the integral bottom plate 567 is divided into the concrete bottom plate 500, the middle bottom plate 600 and the side bottom plate 700, and the middle bottom plate 600 and the side bottom plate 700 can be removed and reused after construction. The construction cost is saved, and the concrete bottom plate 500, the middle bottom plate 600 and the side bottom plate 700 are easy and fast to install, thereby improving the construction efficiency.

[0061] In an embodiment, the high-connection casing 200 is provided with a through hole 201, and the support leg 300 is arranged to pass through the through hole 201, and the length direction of the support leg 300 is perpendicular to the length direction of the high-connection casing 200. The installation of the support leg 300 is facilitated, and the support leg 300 can pass through the high-connection casing 200 vertically, thereby providing a stable support structure for the cross beam 400 and enhancing the overall stability.

[0062] In an embodiment, the steel casing 100 and the high-connection casing 200 can be regarded as a whole. In another embodiment, the steel casing 100 and the high-connection casing 200 can be regarded as two separate bodies, wherein the high-connection casing 200 is detachably connected to the top of the steel casing 100, and serves as an upward extension of the steel casing 100. When the two are detachably connected, the high-connection casing 200 is mainly used for the early construction, and can be removed and recycled after the construction is completed, thereby saving the cost. In addition, since the through hole 201 is arranged on the high-connection casing 200, the hole can be drilled in advance, which is different from drilling the hole on the steel casing 100 at the construction site. By rotating the high-connection casing 200, the direction of the through hole 201 can be controlled, thereby facilitating the subsequent installation of the support leg 300 and the cross beam 400.

[0063] In an embodiment, there are four steel casings 100, each located at a corner of a rectangle; each four steel casings 100 can be regarded as a unit. There are four crossbeams 400, which are arranged substantially horizontally and substantially parallel to each other; the crossbeams 400 are arranged on the support legs 300 extending out of the high-connection casings 200. The number and position of the steel casings 100 and the crossbeams 400 are designed so that the suspended box structure has better stability and load-bearing capacity in a rectangular layout, and is suitable for large pile cap construction.

[0064] In an embodiment, the bottom plate 567 is provided with corbels 120; the end of the corbel 120 is provided with a counter shear key 130. During construction, the counter shear key 130 can be welded with the steel casing 100 or the high-connection casing 200, and the connection between the bottom plate 567 and the steel casing 100 or the high-connection casing 200 is achieved through the corbel and the counter shear key.

[0065] More specifically, the corbel 120 is a supporting leg between the high-connection casing 200 / steel casing 100 and the bottom plate 567, which is made of steel and can be a steel plate or a steel column. The upper end of the corbel 120 is connected to the high-connection casing 200 / steel casing 100 through the counter shear key 130, and the lower end is connected to the overall bottom plate 567 (concrete bottom plate 500); the two ends can be connected by welding.

[0066] In an embodiment, the high-connection casing 200 is provided with a support 900 above the bottom plate 567; at least one steel cable 110 is arranged through the support 900, and the lower end of the steel cable 110 is connected to the bottom plate 567. The steel cable 110 is used to realize the lifting and adjusting function of the bottom plate 567 and the cofferdam 800, and facilitates accurate control during construction. In an alternative embodiment, the high-connection casing 200 is provided with a support 900 above; the steel cable 110 is movably arranged through the support 900, and the lower end is connected to the crossbeam 400 through the bottom plate 567.

[0067] More specifically, as shown in FIG. 5, the support 900 includes an upper support 901 and a lower support 902 arranged in an upper and lower manner; the lower support 902 is provided with a jack 140 and a support column 150 capable of supporting the upper support 901. The steel cable 110 can be selected from a precision rolled threaded steel bar, which is arranged through the upper support 901 and the lower support 902, and an upper nut 111 and a lower nut 112 are arranged above each support 901, 902 and are threadedly connected with the steel cable 110. By adjusting the jack 140, the upper nut 111 and the lower nut 112, the steel cable 110 can be gradually moved downward, so that the bottom plate 567 and / or the crossbeam 400 can be moved downward.

[0068] In an embodiment, the concrete bottom plate 500 has a through hole 502. The concrete bottom plate 500 is sleeved on the high-connection pile casing 200 or the steel pile casing 100 through the through hole 502. The total volume of the concrete bottom plate 500 (i.e. the volume of all the concrete bottom plates 500 on the same whole bottom plate is added up) is less than 25% of the total volume of the whole bottom plate 567, even less than 20%, for example, can be 23%, 21%, 19%, 18%, etc.

[0069] The construction method comprises a step S000 for preparation for construction.

[0070] Specifically, the step S000 comprises placing the grouting equipment, the drilling equipment, the hoisting equipment, the steel pile casing 100, the high-connection pile casing 200, the support foot 300, the cross beam 400, the concrete bottom plate 500, the middle bottom plate 600, the side bottom plate 700 and the cofferdam 800 in the construction area; wherein the construction area is a water area, the grouting equipment, the drilling equipment and the hoisting equipment are all conventional equipment in the field of underwater foundation construction technology, which respectively provide the functions of grouting concrete, underwater drilling and hoisting each device / equipment. If the construction position is close to the shore, each of the above-mentioned equipment / parts is moved and placed on the shore of the construction area. If the construction position is far away from the shore, each of the above-mentioned equipment / parts is moved and placed on the construction ship, and the construction ship is moved to the construction area. It is worth noting that the hoisting equipment can be integrated on the construction ship, i.e. the construction ship is provided with the hoisting equipment.

[0071] The step S000 is followed by a step S100 for a steel pipe pile construction step. The steel pipe pile construction step comprises installing the steel pile casing 100 and injecting concrete.

[0072] Specifically, the step S100 comprises drilling holes on the water bottom according to the construction drawings, hoisting the steel pile casing 100 and inserting it into the corresponding hole from top to bottom, and injecting concrete into the steel pile casing 100 through the grouting equipment and waiting for solidification. The installation of the steel pile casing 100 and the concrete injection step ensure the foundation stability of the construction method and provide a solid foundation for subsequent construction.

[0073] Further, the step S100 comprises a step S110 for underwater drilling; specifically, four drill holes are drilled in sequence at the construction position in the construction area by using the drilling equipment according to the drawings.

[0074] The step S100 further comprises a step S120 located after the step S110. Specifically, the hoisting cable of the hoisting equipment is connected to one end of the steel pile casing 100 by using the hoisting equipment. The steel pile casing 100 is hoisted to ensure that the steel pile casing 100 is vertically arranged. The bottom end of the steel pile casing 100 is aligned with the corresponding drill hole. The steel pile casing 100 is lowered to insert the bottom end of the steel pile casing 100 into the drill hole. The above steps are repeated until all the steel pile casings 100 are inserted into the water bottom.

[0075] Further, after the steel casing 100 is inserted into the seabed, the steel casing 100 can be inserted to a specified depth by a piling device in step S120. The height of the top end of the steel casing 100 can be observed by a total station or a measuring scale.

[0076] In an embodiment, after step S100, step S200 is performed to install the riser casing 200. That is, the riser casing 200 is connected to the top of the steel casing 100.

[0077] Specifically, in step S200, the lifting cable of the hoisting device is connected to one end of the riser casing 200. The riser casing 200 is hoisted to ensure that the riser casing 200 is vertically arranged. The bottom end of the riser casing 200 is aligned with the top end of the corresponding steel casing 100. The riser casing 200 is lowered to abut the top end of the steel casing 100. The steel casing 100 and the riser casing 200 are connected. The above steps are repeated until all the riser casings 200 are connected to the steel casings 100.

[0078] Before the steel casing 100 and the riser casing 200 are connected, step S200 further includes manually rotating the riser casing 200 to ensure that the directions of the perforations 201 on each riser casing 200 are parallel. This operation enables the subsequent support legs 300 to be parallel to each other, and further facilitates the parallel arrangement of the crossbeams 400.

[0079] The connection between the riser casing 200 and the steel casing 100 can be a buckle, a slot, or the like, or can be a plug-in connection. These are connection methods known to those skilled in the art.

[0080] In an embodiment, after step S200, step S300 is performed to install the crossbeams 400. Specifically, the support legs 300 are inserted through the riser casings 200. The crossbeams 400 are hoisted and lowered onto the corresponding support legs 300 from top to bottom, so that each crossbeam 400 is arranged horizontally and substantially parallel to each other.

[0081] In a specific embodiment, step S300 includes step S310, which is performed to install the support legs 300. Specifically, the support legs 300 are manually inserted through the perforations 201 on the corresponding riser casings 200. The lengths of the support legs 300 extending out of the riser casings 200 at both ends are ensured to be approximately equal. The above steps are repeated until the support legs 300 are installed on each riser casing 200. In this application, because the directions of the perforations are ensured to be parallel in step S200, after the support legs 300 are installed in step S300, the support legs 300 are parallel to each other and have substantially equal heights.

[0082] Step S300 further comprises step S320 after step S310, which is to place the cross beam 400 on the support leg 300. Specifically, the cross beam 400 is hoisted by hoisting equipment to ensure that the cross beam 400 is in a horizontal state. The cross beam 400 is adjusted so that the length direction of the cross beam 400 is perpendicular to the length direction of the support leg 300 and also perpendicular to the length direction of the steel casing 100, as shown in FIG. 1. The cross beam 400 is placed on one side of the height-joining casing 200 and above the end of the corresponding support leg 300. The cross beam 400 is lowered so that the cross beam 400 is placed above the support leg 300. The above steps are repeated until all the cross beams 400 are placed on the support legs 300; as shown in FIGS. 1 and 2.

[0083] In an embodiment, step S300 is followed by step S400, which is to install the integral bottom plate 567.

[0084] Step S400 is to place the concrete bottom plate 500 into the corresponding height-joining casing 200 from top to bottom; to insert the middle bottom plate 600 between the corresponding two steel casings 100 and between the corresponding concrete bottom plates 500; and to place the two side bottom plates 700 on both sides of the middle bottom plate 600.

[0085] In a specific embodiment, step S400 comprises step S410, which is to install the concrete bottom plate 500. The concrete bottom plate 500 is hoisted and placed into the corresponding height-joining casing 200 from top to bottom. More specifically, the concrete bottom plate 500 is hoisted by hoisting equipment and moved to the top of the height-joining casing 200. The through hole 502 on the concrete bottom plate 500 is aligned with the height-joining casing 200 below it. The concrete bottom plate 500 is lowered so that the through hole 502 is placed into the height-joining casing 200. The lowering of the concrete bottom plate 500 continues until the concrete bottom plate 500 is placed above the cross beam 400. The above steps are repeated until the concrete bottom plate 500 is installed on each height-joining casing 200.

[0086] Step S400 further comprises step S420 after step S410, which is to install the middle bottom plate 600. Specifically, the middle bottom plate 600 is hoisted and inserted into the corresponding two steel casings 100 / height-joining casings 200 from top to bottom or horizontally; the middle bottom plate 600 is lowered to fall on the cross beam 400; and the two sides of the middle bottom plate 600 in the width direction are attached to the sides of the concrete bottom plate 500 facing them. The length direction of the middle bottom plate 600 (perpendicular to the width direction) is approximately perpendicular to the length direction of each cross beam 400 to be placed on each cross beam 400; as shown in FIG. 3. The detailed design of the bottom plate installation step ensures the accurate installation and splicing of the concrete bottom plate 500, the middle bottom plate 600, and the side bottom plate 700, and improves the integrity and stability of the bottom plate as a whole.

[0087] Step S400 further comprises step S430 after step S420, which is to install the side bottom plate 700. Specifically, the side bottom plate 700 is hoisted, and the side bottom plate 700 is moved from top to bottom or from horizontal direction to the side edge of the middle bottom plate 600, the accommodating cavity 703 is aligned with the concrete bottom plate 500, so that the concrete bottom plate 500 is located in the accommodating cavity 703; the side bottom plate 700 is lowered, and the side bottom plate 700 is placed on the cross beam 400; the side bottom plate 700 is tightly attached with the concrete bottom plate 500 and the middle bottom plate 600, and the overall bottom plate 567 located on the cross beam 400 is formed. The detailed description of the side bottom plate 700 installation step ensures the tight attachment of the side bottom plate 700 with the middle bottom plate 600 and the concrete bottom plate 500, and further enhances the integrity and load-bearing capacity of the bottom plate. At the same time, it is also convenient for quick and accurate operation during disassembly.

[0088] In addition, the step S420 and the step S430 can be exchanged in order, that is, the side bottom plate 700 can be installed first, and then the middle bottom plate 600 is installed, so as to realize the splicing of the overall bottom plate 567.

[0089] In an embodiment, the two sides of the middle bottom plate 600 in the width direction can be outwardly protruding with clamping strips. The side of the side bottom plate 700 facing the middle bottom plate 600 is provided with an inwardly recessed clamping groove. The clamping strip is used for clamping with the clamping groove, so as to realize the connection of the middle bottom plate 600 and the side bottom plate 700. And also provides a seal, reduces the possibility of water seepage. Therefore, the step S430 specifically is that the side bottom plate 700 is hoisted, and the side bottom plate 700 is moved from top to bottom or from horizontal direction to the side edge of the middle bottom plate 600, the accommodating cavity 703 is aligned with the concrete bottom plate 500; the side bottom plate 700 is lowered, and the side bottom plate 700 is placed on the cross beam 400. The side bottom plate 700 is horizontally pushed to move the side bottom plate 700 to the direction of the middle bottom plate 600, so that the clamping strip is clamped into the clamping groove, and the concrete bottom plate 500 enters the accommodating cavity 703. The two sides of the middle bottom plate 600 in the width direction are attached with the side of the concrete bottom plate 500 facing it. The detailed design of the bottom plate installation step ensures the accurate installation and splicing of the concrete bottom plate 500, the middle bottom plate 600 and the side bottom plate 700, and improves the integrity and stability of the bottom plate.

[0090] In an alternative embodiment, in order to make the concrete bottom plate 500, the middle bottom plate 600 and the side bottom plate 700 quickly and stably connected. As shown in FIG. 4, the edge of the concrete bottom plate 500 is outwardly protruding with a first clamping strip 501. The middle bottom plate 600 is provided with a first clamping groove 601 on both sides in the width direction, and the first clamping groove 601 penetrates through both sides along the length direction of the middle bottom plate 600. Therefore, in step S420, the specific steps are as follows: hoisting the middle bottom plate 600, placing the middle bottom plate 600 on one side of the steel casing 100; manually aligning the first clamping groove 601 on the middle bottom plate 600 with the corresponding first clamping strip 501. Moving the middle bottom plate 600 horizontally to make the first clamping strip 501 clamped into the first clamping groove 601 until the middle bottom plate 600 reaches the construction position. That is, the middle bottom plate 600 is inserted between the corresponding two high casing 200 in the horizontal direction, and is clamped with the concrete bottom plate 500.

[0091] Further, the side of the side bottom plate 700 used to contact the concrete bottom plate 500 can be provided with a second clamping groove 701. And the side of the side bottom plate 700 used to contact the middle bottom plate 600 can be provided with a protruding second clamping strip 702. Then, in step S430, hoist the side bottom plate 700, and lower the side bottom plate 700 from above or horizontally close to the side edge of the middle bottom plate 600. The accommodation cavity 703 is aligned with the concrete bottom plate 500 and the side bottom plate 700 is placed on the cross beam 400. Move the side bottom plate 700 horizontally to move the side bottom plate 700 towards the middle bottom plate 600, so that the first clamping strip 501 on the concrete bottom plate 500 is clamped into the second clamping groove 701 of the side bottom plate 700, and the second clamping strip 702 on the side bottom plate 700 is clamped into the first clamping groove 601 of the middle bottom plate 600. Through the design of the first clamping strip 501, the first clamping groove 601, the second clamping groove 701 and the second clamping strip 702, the stability of the connection between the middle bottom plate 600, the side bottom plate 700 and the concrete bottom plate 500 is improved, and the waterproof performance is also provided to avoid water leakage.

[0092] In summary, the adjacent concrete bottom plate 500, middle bottom plate 600 and side bottom plate 700 can be connected through the clamping structure. In an embodiment, the clamping structure includes a protruding clamping strip provided on one of the bottom plates, and a recessed clamping groove provided on the other adjacent bottom plate.

[0093] It is conceivable that, in order to further improve the waterproof performance, sealing strips can be provided on the first clamping strip 501, the first clamping groove 601, the second clamping groove 701 and the second clamping strip 702. Or after clamping, foaming glue for water blocking can be sprayed in the gap between the clamping strip and the clamping groove to achieve sealing.

[0094] In an embodiment, the first clamping strip 501 can be a magnetic member (e.g. a magnet), which facilitates the alignment and connection of the first clamping groove 601 and the second clamping groove 701 during installation. Moreover, through magnetic attraction, the concrete bottom plate 500, the middle bottom plate 600 and the side bottom plate 700 are connected more closely, avoiding water leakage. At this time, at least the clamping grooves 601, 602 contain metal, for example, the middle bottom plate 600 and the side bottom plate 700 are both steel plates, or both are reinforced concrete plates, and the clamping grooves contain steel bars.

[0095] Step S400 is followed by step S500, which is to install the cofferdam cylinder 800 and install the support 900 and the steel cable 110.

[0096] Specifically, step S500 is to hoist the cofferdam cylinder 800 by hoisting equipment, place the cofferdam cylinder 800 above the height-joining cylinder 200, and from top to bottom, sleeve into the height-joining cylinder 200, connect the bottom of the cofferdam cylinder 800 with the integral bottom plate (side bottom plate 700); fix the support 900 to the top end of the height-joining cylinder 200, and connect the bottom of the steel cable 110 with the integral bottom plate 567 (or the concrete bottom plate 500).

[0097] When the steel cable 110 is connected with the cross beam 400, step S500 is to hoist the cofferdam cylinder 800 by hoisting equipment, place the cofferdam cylinder 800 above the height-joining cylinder 200, and from top to bottom, sleeve into the height-joining cylinder 200, connect the bottom of the cofferdam cylinder 800 with the integral bottom plate 567 (or the side bottom plate 700); fix the support 900 to the top end of the height-joining cylinder 200; the steel cable 110 is movably connected with the support 900, and is fixed by sleeving the upper nut 111 and the lower nut 112 on the steel cable 110, wherein the upper nut 111 is above the upper support 901, and the lower nut 112 is above the lower support 902; the lower end of the steel cable 110 passes through the concrete bottom plate 500 and is fixedly connected with the cross beam 400, so as to be able to lower the cross beam 400 and the cofferdam cylinder 800 and the bottom plate 567 located thereon.

[0098] In an embodiment, the cofferdam cylinder 800 is divided into a plurality of cofferdam plates. Further, the specific steps of step S500 are to hoist the cofferdam plate by hoisting equipment, and connect the bottom of the cofferdam plate with the bottom plate 567. Repeat the above steps, and ensure that the cofferdam plate is adjacent to and connected with the previous cofferdam plate. Until all cofferdam plates are spliced to form a ring-shaped cofferdam cylinder 800. The cofferdam cylinder 800 and the bottom plate 567 together form a cofferdam. In addition, a sealing ring is arranged between the cofferdam cylinder 800 and the bottom plate 567 to achieve water-blocking sealing and prevent external water from entering the cofferdam.

[0099] Step S500 is followed by step S600, which is to lower the cofferdam.

[0100] In one embodiment, step S600 is specifically removing the cross beam 400 and the support leg 300 (while removing the counter shear key 130 between the bracket 120 and the high connection cylinder 200, so that the bottom plate 567 and the high connection cylinder 200 can move relatively); moving the steel cable 110 relative to the support 900, so that the bottom plate 567 and the cofferdam cylinder 800 are lowered along the high connection cylinder 200 / steel cylinder 100; after being lowered to the fixed position, the counter shear key 130 is welded and fixed with the steel cylinder 100, so that the bracket 120 is supported between the bottom plate 567 and the steel cylinder 100. In this embodiment, the bottom plate 567 is the force bearing part of the steel cable 110.

[0101] In another embodiment, when the steel cable 110 is connected with the cross beam 400, step S600 is specifically removing the support leg 300, while removing the counter shear key 130 between the bracket 120 and the high connection cylinder 200, so that the bottom plate 567 and the high connection cylinder 200 can move relatively; moving the steel cable 110 relative to the support 900, so that the cross beam 400, the bottom plate 567 and the cofferdam cylinder 800 are lowered along the high connection cylinder 200 / steel cylinder 100; after being lowered to the fixed position, the counter shear key 130 is welded and fixed with the steel cylinder 100, so that the bracket 120 is supported between the bottom plate and the steel cylinder 100. In this embodiment, the cross beam 400 is the force bearing part of the steel cable 110.

[0102] When the steel cable 110 is a finished rolled threaded steel bar, the specific operation of moving the steel cable 110 is: loosening the upper nut 111, tightening the lower nut 112, and then using the jack 140 to move the upper support 901 upward to leave the support column 150; after rising to a certain height H, the upper nut 111 is tightened, the lower nut 112 is loosened, and the jack 140 is retracted downward, so that the upper support 901 falls back to contact the support column 150 and is supported by it; in this process, the threaded steel bar moves downward by a height of H; repeating the above steps, the threaded steel bar gradually moves downward, and the cofferdam reaches the fixed height; then the upper nut 111 and the lower nut 112 are tightened at the same time, and the height is locked.

[0103] In an embodiment, step S600 is followed by step S700, which is removing the riser 200, the steel cable 110, and the support 900. Step S700 can be manually separating the steel cable 110 from the bottom plate 567 or the beam 400. Connecting the hoisting device to the riser 200, hoisting the riser 200 and moving it out. With the riser 200, the cofferdam can be initially placed on the riser 200, so as to be high enough away from the water surface to meet the dry construction condition. As the cofferdam is lowered, the cofferdam is placed on the steel casing 100 and finally partially in the water, at which time the riser 200 is removed; such arrangement and operation, firstly, can make the steel casing 100 as short as possible, low in cost and low in piling difficulty, and will not cut off the excess steel casing 100 after the completion of construction, saving construction time; secondly, the riser 200 can be recycled, saving economic cost; thirdly, the openings of the support feet 300 are located on the riser 200 and can rotate relative to the steel casing 100, without the need for on-site construction of punching.

[0104] In an embodiment, step S700 is followed by step S800, which is draining water. Specifically, water in the cofferdam 800 is pumped out.

[0105] Step S800 can include step S810, which is sealing. Specifically, a waterproof membrane bag is arranged between the concrete bottom plate 500 and the steel casing 100, and mortar is injected into the waterproof membrane bag. Through the waterproof membrane bag and the injection of mortar, water is effectively prevented from seeping from the gap between the concrete bottom plate 500 and the steel casing 100, ensuring the smooth progress of subsequent water drainage.

[0106] Step S800 can also include step S820 after step S810; which is pumping water. Specifically, the input end of the water pumping device is connected to the cofferdam 800, and the water pumping device is started to pump out the water in the cofferdam 800. Artificially observe whether there are water leakage points, if there are water leakage, manually fill and seal.

[0107] In an embodiment, step S800 is followed by step S900, which is pile cap 160 construction. Step S900 can be installing a formwork on the bottom plate, installing a steel reinforcement cage in the formwork, and pouring concrete.

[0108] Further, step S900 specifically includes hoisting the formwork by a hoisting device and placing the formwork on the bottom plate 567 from top to bottom. Adjusting the position of the formwork. Hoisting the steel reinforcement cage, placing the steel reinforcement cage in the formwork and adjusting the position. Pouring concrete in the formwork by a pouring device. Waiting for the concrete to solidify to form the pile cap 160.

[0109] In one embodiment, step S900 is followed by step S1000, which is disassembly. In step S1000, the cofferdam cylinder 800 is lifted out from bottom to top; the side bottom plate 700 is pulled out horizontally away from the middle bottom plate 600; and the middle bottom plate 600 is pulled out horizontally from between the steel casings 100.

[0110] Further, in step S1000, the cofferdam plates are connected by hoisting equipment and are taken out one by one. Then the side bottom plate 700 is translated away from the middle bottom plate 600 and is taken out. The middle bottom plate 600 is pulled out horizontally along its length.

[0111] The bottom plate 567 is divided into the concrete bottom plate 500, the middle bottom plate 600, and the side bottom plate 700. After construction, the middle bottom plate 600 and the side bottom plate 700 can be disassembled and reused, saving costs. Preferably, the overall bottom plate 567 is circular. In some embodiments, the middle bottom plate 600 and the side bottom plate 700 are both steel plates, which occupy a large volume and have a large weight in the bottom plate 567. By reusing the steel plates, the economic benefits are very high. In other embodiments, the concrete bottom plate 500, the middle bottom plate 600, and the side bottom plate 700 are all reinforced concrete bottom plates. By reusing the middle bottom plate 600 and the side bottom plate 700, the economic benefits are also quite objective. In addition, since the middle bottom plate 600 and the side bottom plate 700 can be reused, when the bottom plate 567 is made, its size (e.g., diameter) can be large enough to meet the requirements of pile caps of various sizes, and the use frequency is high, without causing waste of the bottom plate. For example, when the diameter of the pile cap 160 is 5-10 meters, the bottom plate 567 with a diameter of 11 meters can be used, and the pile cap 160 can also be set in different shapes, such as a cylinder, a cube, a cuboid, etc.

[0112] From the description of the embodiments of the construction method of the present application, it can be seen that the present application has at least one or more of the following advantages:

[0113] 1. The bottom plate 567 is divided into the concrete bottom plate 500, the middle bottom plate 600, and the side bottom plate 700. After construction, the middle bottom plate 600 and the side bottom plate 700 can be disassembled and reused. This saves construction costs, and the concrete bottom plate 500, the middle bottom plate 600, and the side bottom plate 700 are easy and fast to install, improving construction efficiency.

[0114] 2. Through the design of the first clamping strip 501, the first clamping groove 601, the second clamping groove 701, and the second clamping strip 702, the stability of the connection between the middle bottom plate 600, the side bottom plate 700, and the concrete bottom plate 500 is improved, and waterproof performance is also provided to avoid water leakage.

[0115] 3. The high-rise casing 200 can be reused, avoiding waste of the casing and saving construction time.

[0116] It should be noted that the various embodiments described in the specification are intended to be exemplary only and that the scope of the application is not limited to the embodiments described in the specification. The same parts in different embodiments are identified with the same reference numerals.

[0117] The embodiments described above are merely preferred embodiments of the present application, and are not intended to limit the scope of the present application. Any modification and improvement made by those skilled in the art to the technical solutions of the present application without departing from the design spirit of the present application shall fall within the protection scope of the present application.

Claims

1. A method of construction of a steel suspended box, wherein, Comprise: S100, steel pipe pile construction: install steel casing and pour concrete therein; S200, install high connection casing: connect high connection casing on top of each steel casing respectively; S300, install crossbeam: pass support foot through high connection casing; hoist crossbeam and drop it onto support foot from top to bottom; S400, install integral bottom plate; Pour concrete bottom plate into each high connection casing from top to bottom respectively, the number of concrete bottom plates is equal to the number of high connection casings; Insert middle bottom plate between two adjacent high connection casings and between concrete bottom plates; make middle bottom plate and concrete bottom plate fit together; Place two side bottom plates on both sides of middle bottom plate respectively and fit them with both sides of middle bottom plate; each side bottom plate has accommodating cavity which can accommodate concrete bottom plate and fit with it; Concrete bottom plate, middle bottom plate and side bottom plate fit together as integral bottom plate and are located on crossbeam; S500, install cofferdam casing and install support and steel cable: hoist cofferdam casing and insert it into high connection casing from top to bottom, connect cofferdam casing bottom with integral bottom plate; fix support to top end of high connection casing and connect steel cable bottom with integral bottom plate; S600, lower cofferdam: remove crossbeam and support foot; move steel cable to make integral bottom plate and cofferdam casing descend along steel casing; weld and fix anti-shear key on integral bottom plate with steel casing after descending to fixed position; S700, remove high connection casing, steel cable and support; S800, drainage: remove water in cofferdam casing; S900, construction of pile cap: install formwork on integral bottom plate and install steel reinforcement in formwork to pour concrete; S1000, removal: Hoist and remove cofferdam casing from bottom to top; Remove side bottom plate from middle bottom plate in horizontal direction; Remove middle bottom plate from between steel casings in horizontal direction.

2. The construction method according to claim 1, wherein S100 specifically comprises: drilling holes in water bottom according to construction drawing, hoisting steel casing and inserting it into corresponding hole from top to bottom, pouring concrete in steel casing and waiting for solidification; S300 comprises S310, which is to install support foot; pass support foot through hole on high connection casing; ensure that the length of each support foot extending out of high connection casing is close; repeat the above steps until support foot is installed on each high connection casing; S320 is to place crossbeam on support foot after S310: hoist crossbeam by hoisting equipment to ensure that crossbeam is in horizontal state; adjust crossbeam to make the length direction of crossbeam perpendicular to the length direction of support foot; place crossbeam on one side of high connection casing and above end of support foot; lower crossbeam to place it above support foot.

3. The construction method of claim 1, wherein, S400 more specifically comprises: S410, install concrete bottom plate: hoist concrete bottom plate and insert it into high connection casing from top to bottom; S420, install middle bottom plate: hoist middle bottom plate, insert it into two high connection casings from top to bottom or in horizontal direction; lower middle bottom plate to make it fall on crossbeam; fit both sides of middle bottom plate in width direction with one side of concrete bottom plate facing it; S430, installing the side bottom plate: lifting the side bottom plate, aligning the accommodating cavity with the concrete bottom plate from top to bottom or from horizontal direction to the side edge of the middle bottom plate; lowering the side bottom plate to the cross beam; tightly attaching the side bottom plate to the concrete bottom plate and the middle bottom plate.

4. The construction method of claim 1, wherein, Step S700 comprises: separating the steel cable from the integral bottom plate; connecting the lifting device to the high-connection pile, lifting the high-connection pile and moving it out.

5. The construction method of claim 1, wherein, Step S800 comprises step S810: arranging a waterproof membrane bag between the concrete bottom plate and the steel pile, and injecting mortar into the waterproof membrane bag; Step S810 is followed by step S820, comprising: connecting the input end of the water pumping device to the cofferdam, and starting the water pumping device to pump out the water in the cofferdam; Artificial observation whether there is a leakage point, if there is a leakage, artificial filling sealing.

6. The construction method of claim 1, wherein, Before step S100, step S000 is included: placing the grouting device, the punching device, the lifting device, the steel pile, the high-connection pile, the supporting foot, the cross beam, the concrete bottom plate, the middle bottom plate, the side bottom plate and the cofferdam in the construction area.

7. The construction method of claim 1, wherein, The edge of the concrete bottom plate is outwardly convex with a first clamping strip, and a first clamping groove is arranged on both sides of the middle bottom plate in the width direction; the first clamping strip can be partially clamped into the first clamping groove; The side of the side bottom plate used for contacting the concrete bottom plate is provided with a second clamping groove; the side of the side bottom plate used for contacting the middle bottom plate is provided with a convex second clamping strip; the first clamping strip can be partially clamped into the second clamping groove; and the second clamping strip can be clamped into the first clamping groove.

8. The construction method of claim 1, wherein, The integral bottom plate selects at least one of the following schemes: The first scheme: the middle bottom plate and the side bottom plate are both steel plates; and the concrete bottom plate is a reinforced concrete bottom plate; The second scheme: the concrete bottom plate, the middle bottom plate and the side bottom plate are all reinforced concrete bottom plates.

9. The construction method of claim 1, wherein, The integral bottom plate is a circular plate; the volume of the middle bottom plate and the side bottom plate is greater than the total volume of the concrete bottom plate; and the total volume of the concrete bottom plate is less than 25% of the total volume of the integral bottom plate.

10. The construction method of claim 1, wherein, The step S500 can be replaced by: installing the cofferdam and installing the support and the steel cable: lifting the cofferdam and sleeving it into the high-connection pile from top to bottom, connecting the bottom of the cofferdam to the integral bottom plate; fixing the support to the top end of the high-connection pile, movably connecting the steel cable to the support, and connecting the bottom of the steel cable to the cross beam; The S600 can be replaced by: removing the supporting foot; moving the steel cable to make the cross beam, the integral bottom plate and the cofferdam descend along the high-connection pile / steel pile; and welding and fixing the counter shear key to the steel pile after descending to the fixed position.

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