Construction method for precise alignment of hoisting of prefabricated pier body

Abstract

The invention provides a construction method for precise hoisting alignment of a prefabricated pier body, which comprises the following steps: when a crane ship is moved for initial positioning, front and rear anchors are used for positioning and a winch cable is used for auxiliary adjustment, when the crane ship is subjected to pier falling for initial alignment, front double hooks are controlled to slowly fall according to different strokes in a graded manner, and in the process of lowering the pier body, the left and right falling positions of the pier body are finely adjusted through a hinge anchor ship; aligning the front and rear positions of the falling pier in a manner of amplitude variation of a straight arm frame and synchronous correction and coarse positioning of front double hooks; when the bottom-section pier body is precisely aligned, the bottom-section pier body assists the pier body to gradually fall to the corresponding position of the bearing platform through a limiting device pre-buried in an inner cavity of the pier body, and then the precise position of the pier body is adjusted through a fine adjustment screw of the limiting device of the bottom-section pier body; and finally, accurate alignment of the middle-section pier body and the upper-section pier body is carried out. According to the method, the installation alignment time between the pier body sections is shortened, and the rapid and accurate alignment effect is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and in particular relates to a construction method for accurately aligning the hoisting of a prefabricated pier body. Background Art

[0002] The construction of offshore bridge piers is the foundation of cross-sea bridge construction. After the pier segments are prefabricated in the beam yard, they are transported to the construction site by a transport ship in a single trip of 4 segments, and hoisted as a whole by a variable-length straight-arm crane. The sea area where the pier is hoisted has high waves and rapid currents, and is greatly affected by breaking waves and currents. The weather environment on site is complex, and the ship is located close to the piers and trestle. The operating space is narrow and the risk of collision is high. The overall hoisting and lowering of the pier is difficult, and the efficiency of accurate alignment is low. Therefore, it is urgent to use a variable-length straight-arm crane to use its ship informationization and lifting balance system in conjunction with the pier hoisting tooling to ensure that the pier segments are hoisted and aligned quickly, efficiently, and safely, thereby solving the problem of low efficiency of on-site pier hoisting alignment, improving the overall hoisting efficiency of the pier, and making up for the problem of high construction costs. Summary of the invention

[0003] In view of this, the invention aims to overcome the defects in the prior art and proposes a construction method for precise positioning of the prefabricated pier body hoisting.

[0004] To achieve the above object, the technical solution created by the present invention is implemented as follows:

[0005] A construction method for precise positioning of prefabricated pier body hoisting comprises the following steps:

[0006] S1. Initial positioning of crane ship moving;

[0007] After the crane ship takes the pier, it uses the front and rear anchors to position and the winch cables to assist in adjustment, and slowly moves the ship to the lifting and lowering position; when the crane ship has difficulty moving forward during the ship moving process, tighten the forward cables to move the crane ship forward to just above the pier to be erected, and then tighten the cables and anchor cables to continue moving forward to the position after the forces are balanced;

[0008] S2, initial alignment of the crane vessel landing on the pier;

[0009] The prefabricated pier body is hoisted to the position just above the pier to be erected, the crane ship stops moving forward, the cable is in a stressed state to stabilize the ship, and the front double hooks are controlled to slowly drop the hooks according to different stroke levels. During the pier body lowering process, the left and right positions of the pier body are fine-tuned by anchoring the ship; the front and rear positions of the dropped pier are aligned by means of the luffing of the straight boom and the synchronous correction of the rough positioning of the front double hooks;

[0010] S3, accurate positioning of the bottom section pier;

[0011] The bottom section pier body is assisted by the limiting device embedded in the inner cavity of the pier body to gradually fall to the corresponding position of the pier cap. The pier is stopped when it is 10 cm away from the pier cap. The precise position of the pier body is adjusted by the fine adjustment screw of the limiting device of the bottom section pier body.

[0012] S4, precise alignment of the middle and upper segments of the pier;

[0013] The bottom section pier body and the middle section pier body, as well as the middle section pier body and the upper section pier body are initially positioned through external embedded limit devices. The pier body slowly falls into the limit area through the upper and lower symmetrical wedge-shaped alignment devices, and finally the verticality of the pier body is adjusted. After inspection and compliance with the design and specification requirements, it slowly falls to the top of the lower section pier to complete the alignment.

[0014] Furthermore, the crane vessel is provided with a total of 8 anchors at the front and rear, including four front anchors and four rear anchors.

[0015] Furthermore, when moving the ship, a special person is assigned to monitor the stress conditions of the ship's 8 anchor cables and 2 winches in the cab. When the stress is too great, the anchor cables are loosened in time according to the alarm signal. At the same time, there are special personnel at each point on site to observe the stress conditions of the anchor cables to ensure the safety of the ship. After the force is balanced, the cables and anchor cables are tightened and the ship continues to move forward into position.

[0016] Furthermore, the inner cavity of the pier body of the bottom section pier body is provided with 6 pre-embedded limit devices.

[0017] Furthermore, six limiting devices are respectively embedded and installed at the bottom and top of the middle section pier body, and six limiting devices are respectively embedded and installed at the bottom and top of the upper section pier body.

[0018] Furthermore, the verticality of the pier can be accurately adjusted by means of the ship hoisting balance system and the synchronous correction of the front double hooks.

[0019] Furthermore, the limiting device of the bottom section pier body comprises a bottom section pier body limiting seat, and the fine adjustment screw of the bottom section pier body is installed on the bottom section pier body limiting seat.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] The present invention can meet the requirements of hoisting and positioning construction of pier bodies in different sea conditions and different sections. The crane ship moves and stabilizes the ship by combining 8 anchor positioning and 2 winches with cables, which speeds up the efficiency of initial positioning of the ship. The lifting balance system is used to adjust the amplitude of the straight boom of the crane ship and the linkage effect of the front double hooks for synchronous correction, and the front and rear errors and horizontality of the pier body are adjusted during positioning. At the same time, the limiting device pre-buried on the pier body is used to fine-tune the four-point positioning error during positioning of the pier body, reduce the installation and positioning time between the pier body sections, and achieve fast and accurate positioning effect. The limiting device of the bottom section pier body can simultaneously meet the functions of hoisting positioning and accurate positioning through fine-tuning screws, replacing the use of traditional jacks. The pier body does not need to be disassembled after installation, thereby improving the ship moving efficiency and positioning installation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0023] Figure 1 This is the construction flow chart for pier body hoisting alignment;

[0024] Figure 2 This is a schematic diagram of the crane ship hoisting plan;

[0025] Figure 3 This is a schematic diagram of the crane vessel landing on the pier;

[0026] Figure 4 for Figure 3 A schematic diagram of the structure enlargement in the middle;

[0027] Figure 5 This is a schematic diagram of the crane vessel dropping into place;

[0028] Figure 6 It is a schematic diagram of the limiting device of the bottom section pier body;

[0029] Figure 7 This is a schematic diagram of the initial alignment of the middle pier and the upper pier;

[0030] Figure 8 This is a schematic diagram of the precise alignment of the middle pier and the upper pier;

[0031] Fig. 9 It is a three-dimensional diagram of the limiting device at the bottom of the pier body;

[0032] Fig.10 This is a three-dimensional diagram of the limiting device on the top of the pier body. DETAILED DESCRIPTION

[0033] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0035] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0036] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0037] A construction method for precise positioning of prefabricated pier body hoisting, such as Figures 1 to 10 As shown, the following steps are included:

[0038] S1. Initial positioning of the crane ship for ship moving; the jib crane ship 1 uses the pier body hoist 8 to take the pier, and then uses the front and rear anchor positioning and winch cable to assist in adjustment, and slowly moves the ship to the lifting and lowering position; when the crane ship has difficulty moving forward during the ship moving process, tighten the forward cable to move the crane ship forward to the top of the pier to be erected, and then tighten the cable and anchor cable to continue moving forward to the position after the force is balanced; there are a total of 8 anchors in front and behind the crane ship, including the front four anchors 3 and the rear four anchors 4. When moving the ship, a special person is assigned to monitor the stress of the ship's 8 anchor cables and the 2 winch cables 5 in the cab. When the force is too large, the anchor cables are loosened in time according to the alarm signal. At the same time, a special person is assigned to observe the stress of the anchor cables at each point on site to ensure the safety of the ship, and the cable and anchor cables are tightened to continue moving forward to the position after the force is balanced.

[0039] S2. Initial alignment of the crane ship for pier drop; the prefabricated pier body is hoisted to the position just above the pier to be erected, the crane ship stops moving forward, the cable is in a stressed state to stabilize the ship and position, the front double hook 6 is controlled to slowly drop the hook according to different stroke levels, and during the pier body lowering process, the left and right positions of the pier body are fine-tuned by anchoring the ship; the front and rear positions of the pier are aligned by the amplitude change of the straight arm 2 and the synchronous correction of the rough positioning of the front double hooks. All changes in height and tonnage during the pier body lifting and dropping process will be displayed on the industrial computer and touch screen on the console, and the display system and the torque control system communicate quickly and effectively to achieve immediate shutdown protection in case of abnormalities.

[0040] S3, accurate positioning of the bottom section pier body; the bottom section pier body 9 is assisted by various limiting devices pre-buried in the inner cavity of the pier body to gradually fall to the corresponding position of the pedestal 10, and the pier stops falling when it falls to the bottom and is 10 cm away from the pedestal. As an example, the inner cavity of the pier body of the bottom section pier body is provided with 6 pre-buried limiting devices. The precise position of the pier body is adjusted by the fine adjustment screw 13 of the bottom section pier body limiting device. The limiting device of the bottom section pier body includes a bottom section pier body limiting seat 12, and the fine adjustment screw of the bottom section pier body is installed on the bottom section pier body limiting seat.

[0041] After the six fine-adjustment screws around are adjusted and aligned, fix the fine-adjustment screws, check the plane and verticality of the pier body, and after checking that they meet the design and specification requirements, slowly drop the pier onto the pedestal again. The bottom pier body limit device not only meets the rough positioning when dropping the pier, but also meets the fine adjustment and rapid alignment. It does not need to be dismantled later, overcoming the shortcomings of time-consuming and bulky fine adjustment of traditional jacks.

[0042] S4, the middle and upper sections of the pier are precisely aligned; the bottom section pier and the middle section pier 19, the middle section pier and the upper section pier 18 are initially positioned by external pre-buried limit devices, and 6 limit devices are pre-buried and installed at the bottom and top of the middle section pier and the upper section pier. The verticality of the pier is precisely adjusted by the ship hoisting balance system and the front double hook synchronous correction. The pier slowly falls into the limit area through the upper and lower symmetrical wedge alignment device, and finally adjusts the verticality of the pier. After inspection to meet the design and specification requirements, it slowly falls to the top of the lower pier to complete the alignment.

[0043] The method of the present invention is suitable for the hoisting construction of large-segment bridge piers in complex sea conditions. It has high hoisting efficiency, high information utilization rate, high hoisting alignment accuracy, reduced construction costs, great promotion value, good social benefits, and provides a reference for the hoisting of large prefabricated components at sea. The invention creates a double front hook and a front double hook in the straight boom that can be adjusted in linkage, effectively adjusting the balance of the pier body to meet the hoisting of piers at different elevations. The lifting balance system and the ship information operation system are used to adjust the amplitude of the straight boom and the synchronous correction of the front double hooks. At the same time, the limiting device on the pier body is used to fine-tune the front and rear errors during the positioning of the pier body, reduce the installation alignment time between the pier body segments, and achieve the effect of precise alignment. The bottom section pier body limiting device simultaneously meets the functions of hoisting alignment and precise alignment through fine-tuning screws. After the pier body is installed, it does not need to be disassembled. In addition, the ship moves and stabilizes the ship by combining 6 anchor positioning and 2 winch cables, which improves the ship moving efficiency and alignment installation efficiency.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A construction method for precise positioning of prefabricated pier body hoisting, characterized in that: The steps include: S1. Initial positioning of crane ship moving; After the crane ship takes the pier, it uses the front and rear anchors to position and the winch cables to assist in adjustment, and slowly moves the ship to the lifting and lowering position; when the crane ship has difficulty moving forward during the ship moving process, tighten the forward cables to move the crane ship forward to just above the pier to be erected, and then tighten the cables and anchor cables to continue moving forward to the position after the forces are balanced; S2, initial alignment of the crane vessel landing on the pier; The prefabricated pier body is hoisted to the position just above the pier to be erected, the crane ship stops moving forward, the cable is in a stressed state to stabilize the ship, and the front double hooks are controlled to slowly drop the hooks according to different stroke levels. During the pier body lowering process, the left and right positions of the pier body are fine-tuned by anchoring the ship; the front and rear positions of the dropped pier are aligned by means of the luffing of the straight boom and the synchronous correction of the rough positioning of the front double hooks; S3, accurate positioning of the bottom section pier; The bottom section pier body is assisted by the limiting device embedded in the inner cavity of the pier body to gradually fall to the corresponding position of the pier cap. The pier is stopped when it is 10 cm away from the pier cap. The precise position of the pier body is adjusted by the fine adjustment screw of the limiting device of the bottom section pier body. S4, precise alignment of the middle and upper segments of the pier; The bottom section pier body and the middle section pier body, as well as the middle section pier body and the upper section pier body are initially positioned through external embedded limit devices. The pier body slowly falls into the limit area through the upper and lower symmetrical wedge-shaped alignment devices, and finally the verticality of the pier body is adjusted. After inspection and compliance with the design and specification requirements, it slowly falls to the top of the lower section pier to complete the alignment.

2. A construction method for precise positioning of prefabricated pier body hoisting according to claim 1, characterized in that: There are a total of 8 anchors at the front and rear of the crane ship, including four front anchors and four rear anchors.

3. The construction method for precise positioning of prefabricated pier body hoisting according to claim 1 is characterized by: When moving the ship, a special person is assigned to the cab to monitor the stress conditions of the ship's 8 anchor cables and 2 winches. When the stress is too great, the anchor cables are loosened in time according to the alarm signal. At the same time, there are special personnel at each point on site to observe the stress conditions of the anchor cables to ensure the safety of the ship. After the force is balanced, the cables and anchor cables are tightened and the ship continues to move forward into position.

4. The construction method for precise positioning of prefabricated pier body hoisting according to claim 1 is characterized by: The inner cavity of the pier body of the bottom section is provided with 6 pre-embedded limit devices.

5. The construction method for precise positioning of prefabricated pier body hoisting according to claim 1 is characterized by: Six limit devices are pre-embedded and installed at the bottom and top of the middle section pier body, and six limit devices are pre-embedded and installed at the bottom and top of the upper section pier body.

6. The construction method for precise positioning of prefabricated pier body hoisting according to claim 1 is characterized by: The verticality of the pier is accurately adjusted through the ship hoisting balance system and the synchronous correction of the front double hooks.

7. The construction method for precise positioning of prefabricated pier body hoisting according to claim 1 is characterized by: The limiting device of the bottom section pier body comprises a bottom section pier body limiting seat, and the fine adjustment screw rod of the bottom section pier body is installed on the bottom section pier body limiting seat.

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