Fabricated cable tower rapid installation and construction method

Abstract

The invention discloses an assembly type cable tower rapid installation construction method, and relates to the technical field of assembly type cable tower construction, and the construction method comprises the following construction steps: preparing a cable tower column foot foundation, preparing a sheet body assembly jig frame, adopting the sheet body assembly jig frame to carry out sheet body assembly to obtain sheet bodies, and installing cable tower segments; two sheet bodies are installed to form a cable tower section, a connecting rod piece between the two sheet bodies is installed through an inter-sheet-body installation platform in the cable tower section installation process, and the remaining cable tower sections are installed. By means of the method, rapid construction and installation of the assembly type cable tower can be achieved when the weight of the whole section of the cable tower is too large, and hoisting equipment does not have the whole-section hoisting capacity. The method has the advantages that the construction efficiency is improved, and the construction difficulty and the safety risk are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of prefabricated cable tower construction, and specifically to a rapid installation construction method for prefabricated cable towers. Background Art

[0002] In the construction of long-span bridges in mountainous areas, the cable hoisting system, as a key construction equipment, plays a crucial role. Facing complex and changeable terrain conditions and tight construction periods, the traditional cable tower erection method has been difficult to meet the requirements of efficient and safe construction. Therefore, the application of the rapid installation construction method for prefabricated cable towers has become an important innovation in the field of long-span bridge construction in mountainous areas.

[0003] The Guniuhe Extra-large Bridge has a total length of 881.8 meters. The main bridge is a through-type steel box truss arch bridge with a calculated span of 520 meters, ranking second in the world among similar bridges in terms of span. It is a key control project for the entire Anpan Expressway. The arch seats on both sides of the cliffs have extremely high construction difficulty. In order to carry out the rapid construction of this bridge, the prefabricated cable tower technology was expected to be used. However, it was found that due to the excessive weight of the cable tower segments (with a height of 5.535m) applicable to this bridge, the lifting equipment did not have the ability to lift the entire segment. Therefore, a new prefabricated cable tower construction method needs to be designed. Summary of the Invention

[0004] The purpose of the present invention is to provide a rapid installation construction method for prefabricated cable towers to solve the rapid construction and installation of prefabricated cable towers when the weight of the entire cable tower segment is too large and the lifting equipment does not have the ability to lift the entire segment.

[0005] The present invention provides the following technical solutions to achieve the above purpose: A rapid installation construction method for prefabricated cable towers, including the following steps: S1: Prepare the cable tower column foot foundation; S2: Prepare the sheet assembly jig; S3: Use the sheet assembly jig to assemble the sheets to obtain the sheets; S4: Install the cable tower segment; two sheets are installed to form a cable tower segment, and during the installation of the cable tower segment, the connecting rod members between the two sheets are installed using the installation platform between the sheets; S5: Repeat step S4 to install the remaining cable tower segments.

[0006] In the aforementioned rapid installation construction method for prefabricated cable towers, further, in S1, the prefabricated cable tower has a total of 16 columns, with every four columns as a group. A cable tower column foot foundation is set at the bottom of a group of cable tower columns. The steel bars in the cable tower column foot foundation extend into the position at the top of the pier capping beam, that is, the construction of the top of the capping beam is a full-section solid web type, so that the cable tower column foot foundation and the T-beam at the top of the capping beam form an integral body; anti-pulling steel profiles are arranged inside the cable tower column foot foundation, and after the anti-pulling steel profiles and the top steel plates are leveled, they are connected and fixed by plug welding after drilling holes.

[0007] In the above-mentioned rapid installation construction method of the prefabricated cable tower, further, in S2, the sheet assembly jig is divided into a leveling foundation at the bottom and a leveling support frame on the leveling foundation; a circular steel plate is arranged at the top of the leveling support frame, and the opening on the steel plate is consistent with the opening of the column flange for temporary fixing of the column; simple supports are used on both sides of the sheet assembly jig as the sheet assembly operation platform for workers to connect the members at the position of the column gusset plate; a total of four sheet assembly jigs are arranged, in two groups, for assembling the sheets.

[0008] In the above-mentioned rapid installation construction method of the prefabricated cable tower, further, in S3, after the construction of the sheet assembly jig is completed, the prefabricated cable tower components that have been processed and manufactured are transported to the site, stacked in zones, and a crane is used for sheet hoisting construction. First, the column is installed on the sheet assembly jig, and after the angle is adjusted in place, it is temporarily fixed with drift pins. Then, the connecting members between the columns are hoisted to the position of the upper node plate of the column, and the workers use steel pins to connect the column and the connecting members on the sheet assembly operation platform. After the steel pin connection is completed, split pins are inserted to complete the sheet assembly; the assembled sheets are hoisted by the crane to the sheet stacking area and wait for hoisting; and the steps in S3 are repeated to assemble the sheets to the corresponding number of sheets.

[0009] In the above-mentioned rapid installation construction method of the prefabricated cable tower, further, the cable tower components include columns with gusset plates and connecting members; the assembled sheets include two columns, and the two columns are connected by three horizontally arranged connecting members and two obliquely arranged connecting members at the upper, middle, and lower positions.

[0010] In the above-mentioned rapid installation construction method of the prefabricated cable tower, further, in S4, before installing the cable tower section, the column foot is installed first. After the installation verticality is checked and found to be correct, the sheet is hoisted onto the column foot flange, and after alignment, high-strength bolts are used for fixation. After two sheet sections are installed on one cable tower column foot foundation, the connecting members between the two sheets are installed using the installation platform between the sheets; The installation platform between the sheets is welded by several steel materials, with two layers, and each layer is provided with guardrails and a ladder is provided to connect each layer; four hanging buckles are arranged on the installation platform between the sheets, with two in the upper part and two in the lower part; the four hanging buckles can fix the installation platform between the sheets on the sheet by fixing on two adjacent horizontally arranged connecting members on the sheet; The installation platform between the sheets is U-shaped in plan view. When the installation platform between the sheets is fixed on the front sheet, the sheet is located at the opening of the U-shape, and both ends of the installation platform between the sheets extend to the rear side of the sheet.

[0011] In the above-mentioned rapid installation construction method of prefabricated cable towers, further, the steps of using the installation platform between the sheets to install the connecting members between the two sheets include: hoisting the installation platform between the sheets to the installation position by a tower crane, fixing the installation platform between the sheets to two adjacent horizontally arranged connecting members of the sheet through four buckles, and workers entering the installation platform between the sheets through a safety ladder cage to connect the members between the two sheets on the platform; during the connection process, after the connecting members are hoisted in place by the tower crane, the workers perform steel pin connections; after completing the connection of all the members between the two sheets in the same way, the installation of one cable tower segment is completed. After the installation, the buckles are opened, the installation platform between the sheets is hoisted and disassembled, and the installation verticality is rechecked and found to be correct.

[0012] In the above-mentioned rapid installation construction method of prefabricated cable towers, further, the buckle includes a cross bar connecting the main body of the installation platform between the sheets. Two vertical bars are arranged at intervals downward at the end of the cross bar. The bottom of the rear vertical bar is hinged with a movable bar through a fixed pin. The movable bar is rotated to the bottom of the front vertical bar through the fixed pin, and the positions of the movable bar and the bottom of the front vertical bar can be fixed through a movable pin.

[0013] In the above-mentioned rapid installation construction method of prefabricated cable towers, further, during the installation process of the remaining cable tower segments, when installing to the corresponding height segment, the transverse connection is installed; after completing the installation of all segments and transverse connections, the construction of the cable tower body is completed. Then, the top beam of the cable tower is arranged at the top of the cable tower body, and finally, the saddle is arranged on the top beam of the cable tower to complete the installation of the prefabricated cable tower.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention uses standardized and modular cable tower components for construction, simplifying the operation process at the construction site; in the installation stage, it is divided into sheet assembly and segment installation, avoiding the problem that the weight of a single segment is too large and the lifting equipment does not have the ability to lift the whole segment. And through the sheet assembly jig, the components can be quickly assembled into a single sheet, and the rapid installation of the components between the sheets can be carried out immediately after the self-designed installation platform between the sheets is in place. The process of the present invention not only greatly simplifies the on-site operation process, reduces high-risk links such as high-altitude operation and welding, but also significantly improves the construction efficiency, reduces the construction difficulty and safety risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the column foundation on one side of the center line of the main bridge; Figure 2 It is a schematic plan view of the cable tower column foot foundation on one side of the center line of the main bridge; Figure 3 It is a schematic diagram of the jig layout structure; Figure 4 It is a schematic plan view of the layout structure of two jigs; Figure 5 This is a schematic diagram of the vertical structure of the assembled pieces on the tire frame; Figure 6 It is a schematic diagram of the top view of the structure in which the inter-sheet mounting platform is fixed on the sheet; Figure 7 This is a schematic diagram of the elevation layout structure of the installation platform between the slices; Figure 8 This is a schematic diagram of the side layout structure of the installation platform between the panels; Figure 9 Schematic diagram of the buckle structure; Figure 10 This is a schematic diagram of the buckling working process; Figure 11 This is a schematic diagram of the assembled cable tower structure obtained through the construction of the present invention; DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0017] In one embodiment, a method for quickly installing an assembled cable tower is provided. This method is used for the cable tower of the Guniu River Bridge. The construction process includes the following steps: S1: Prepare the cable tower column foot foundation; In S1, the assembled cable tower has a total of 16 columns, with four columns forming a group. A cable tower column foot foundation is set at the bottom of a group of cable tower columns. The steel bars in the cable tower column foot foundation extend into the top position of the pier top cap beam, that is, the top of the cap beam is constructed as a full-section solid web type, so that the cable tower column foot foundation and the T-beam on the top of the cap beam form a whole; anti-pullout steel is set inside the cable tower column foot foundation, and the anti-pullout steel and the top steel plate are leveled and then opened and plug-welded to connect and fix them; the cable tower column foot foundation uses C50 concrete.

[0018] During the specific implementation, the cable tower column foot foundation is located on the bridge deck at the position of the left 3# and right 4# piers of the approach bridge of the Guniu River Bridge. The transverse slope of the bridge deck is 3%. To solve the problems of transverse slope of the bridge deck and anti-collision, the foundation is designed to be 0.845-1.1m high. The cable tower has a total of 16 columns, and each group of four columns has a foundation size of 5.4m×5.4m at the bottom of a group of cable tower columns. The steel bars in the foundation extend into the top position of the pier top cap beam, that is, the top of the cap beam is constructed as a full-section solid-web type, so that the foundation and the T-beam at the top of the cap beam form a whole. Pull-out steel is set inside the foundation. After the steel and the top steel plate are leveled, they are connected and fixed by plug welding. The steel plate size is 1.5m×1.5m, and four I20a I-beams are set under each steel plate. The foundation concrete adopts C50. The attached structural reference of the cable tower column foot foundation Figure 1-2 As shown; Figure 1 This is a schematic diagram of the column foundation on one side of the main bridge centerline; Figure 2 This is the base plan of the cable tower column; S2: Prepare the sheet assembly jig. In S2, the sheet assembly jig is divided into a leveling foundation at the bottom and a leveling support frame on the leveling foundation. A circular steel plate is arranged at the top of the leveling support frame, and the opening on the steel plate is consistent with the opening of the column flange for temporary fixation of the column. Simple supports are used on both sides of the sheet assembly jig as the sheet assembly operation platform for workers to connect members at the column gusset plate position. A total of four sheet assembly jigs are provided, grouped in pairs, for assembling the sheets. During specific implementation, the sheet jig is about 15 m away from the cable tower and is arranged at the center line position of the left and right bridge decks. The jig is divided into a leveling foundation and a temporary fixation support frame. The leveling foundation has a size of 1.1 m × 1.1 m and a height of 30 cm - 33 cm, made of C30 concrete with a φ12 steel mesh inside. The leveling support frame is 20 cm high, made of four I20a steel beams, and a circular steel plate is arranged at the top. The opening on the steel plate is consistent with the opening of the column section flange for convenient temporary fixation of the column. The layout method of the jig refers to Figure 3 as shown.

[0019] There are a total of four jigs, grouped in pairs, for sheet assembly. The single segment is 5.535 m high. Simple supports are used on both sides of the jig as the operation platform for workers to connect members at the column gusset plate position. The plane layout method of the two jigs refers to Figure 4 as shown; the elevation view of the sheet assembled on the jig refers to Figure 5 as shown; S3: Assemble the sheets using the sheet assembly jig. After the construction of the sheet assembly jig is completed, the cable tower components that have been processed and manufactured are transported to the site, stacked in zones, and a crane is used for sheet hoisting construction. First, install the columns on the sheet assembly jig, temporarily fix them with drift pins after adjusting the angles in place, then hoist the connecting members between the columns to the upper gusset plate position of the columns, and manually connect the columns and the connecting members with steel pins on the sheet assembly operation platform. After the steel pin connection is completed, insert split pins to complete the sheet assembly; the assembled sheets are hoisted by the crane to the sheet stacking area for waiting for hoisting; and repeat the steps in S3 to assemble the sheets to the corresponding number of sheets. Among them, the cable tower components include columns with gusset plates and connecting members; the assembled sheets include two columns, which are connected by three horizontally arranged connecting members and two obliquely arranged connecting members at the upper, middle, and lower positions; the structure of the assembled sheets can refer to Figure 5 as shown; During specific construction, in this step, a 25t crane is used for sheet hoisting construction. S4: Install the cable tower segments; use the installation platform between the sheets to install the connecting members between two sheets when installing the cable tower segments with two assembled sheets forming one cable tower segment. Before installing the cable tower segment, first install the column base. After checking and verifying that the installation verticality is correct, lift the sheet body to the column base flange, and fix it with high-strength bolts after alignment. After two sheet body segments are installed on one cable tower column base, install the connecting rods between the two sheet bodies using the installation platform between the sheet bodies; The installation platform between the sheet bodies is welded by several steel materials, with two layers. Each layer is provided with a guardrail, and a ladder is provided to connect each layer; four buckles are provided on the installation platform between the sheet bodies, with two in the upper part and two in the lower part; the four buckles can fix the installation platform between the sheet bodies on the sheet body by fixing two adjacent horizontally arranged connecting rods on the sheet body; The installation platform between the sheet bodies is set in a U-shaped view from above. When fixing the installation platform between the sheet bodies on the front sheet body, the sheet body is located at the opening of the U-shaped, and both ends of the installation platform between the sheet bodies extend to the rear side of the sheet body; the top view reference of the installation platform between the sheet bodies fixed on the sheet body Figure 6 is shown; the elevation layout drawing and side view of the installation platform between the sheet bodies refer to Figure 7-8 shown; The steps of installing the connecting rods between the two sheet bodies using the installation platform between the sheet bodies include: lifting the installation platform between the sheet bodies to the installation position by a tower crane, fixing the installation platform between the sheet bodies on two adjacent horizontally arranged connecting rods of the sheet body through four buckles, and workers enter the installation platform between the sheet bodies through the safety ladder cage and connect the rods between the two sheet bodies on the platform; during the connection process, after the connecting rod is lifted in place by the tower crane, the worker makes a steel pin connection; after completing the connection of all the rods between the two sheet bodies in the same way (referring to the method of installing the connecting rods on one side of the two sheet bodies through the installation platform between the sheet bodies and removing the platform to install the connecting rods on the other side of the two sheet bodies), the installation of one cable tower segment is completed. After installation, open the buckles, lift and disassemble the installation platform between the sheet bodies, and check and verify that the installation verticality is correct; Among them, the buckle includes a cross bar connecting the main body of the installation platform between the sheet bodies. Two vertical bars are arranged at intervals downward at the end of the cross bar. The bottom of the rear vertical bar is hinged with a movable bar through a fixed pin. Rotate the movable bar to the bottom of the front vertical bar through the fixed pin, and the positions of the movable bar and the bottom of the front vertical bar can be fixed through a movable pin; the buckle structure reference Figure 9 is shown; the working schematic diagram of the buckle refers to Figure 10 shown; During specific construction, in this step, a 16t tower crane is used for lifting; S5: Repeat step S4 to install the remaining cable tower segments.

[0020] During specific construction, it is necessary to install the remaining 16 segments; During the installation of the remaining cable tower segments, when installing the segments at the corresponding height, the cross bracing is installed; after the installation of all segments and cross bracings is completed, the construction of the cable tower body is completed. Then, the top beam of the cable tower is arranged at the top of the cable tower body, and finally, the saddle is arranged on the top beam to complete the installation of the prefabricated cable tower.

[0021] During the specific construction, the distance between the left and right spans of the cable tower is 11.75 m. The corresponding height segments refer to the 5th, 10th, 14th, and 17th segments. Cross bracings are provided at these segment positions. The cross bracings are divided into two sections for assembly and then hoisted separately. After hoisting the cross bracings onto the ear plates of the columns and connecting them, a construction passage is built on the cross bracing to the connection point of the two sections of the cross bracing for bolt docking construction. After the docking is completed, the construction passage is removed to complete the construction of the cable tower body.

[0022] During the specific construction, the installation of the beam and saddle: The total length of the top beam of the cable tower is 41.35 m. For the convenience of processing, manufacturing, and installation, the beam is divided into 11 segments in a single row and arranged in two rows. Each segment is connected by 40 φ26 high-strength bolts. The connection between the beam and the cable tower is the same as the connection between the cable towers. A flange plate is provided at the bottom of the beam, and the connection holes of the flange plate are the same as those of the cable tower flange plate. The two rows of beams are connected by steel plates. The connection steel plates are reserved during the processing of the beam, and 10 φ26 bolt holes are provided on the steel plate to connect the beams into a whole.

[0023] The shape of the beam is set as an "inverted 7-shaped" block, and the side and bottom surfaces are the saddle slides. The wheels on the side and bottom surfaces of the saddle correspond to the two slides. The cable system is divided into two groups on the left and right, that is, a total of four saddles are provided, two in a group, and the two saddles in each group are connected by a cross brace. For the convenience of processing and manufacturing, the load-bearing cable wheels on the saddle are processed separately. During the installation, the saddle base is hoisted first, and then the upper pulley structure of the saddle is lifted. This part is connected to the saddle base by M24 grade φ30 high-strength bolts.

[0024] The finally completed prefabricated cable tower is shown in Figure 11 as follows.

[0025] During the implementation process, it is also necessary to strictly follow relevant standards for technical specifications to ensure quality. The implementation standards include: (1) "Two-stage Construction Drawings Design for the Expansion Project of the Anshun to Panzhou (Guizhou-Yunnan Border) Section of the Shanghai-Kunming National Highway"; (2) "Technical Specifications for Highway Bridge and Culvert Construction" (JTG / T 3650-2020); (3) "Quality Inspection and Evaluation Standards for Highway Engineering" (JTCF80 / 1-2017); (4) "Safety Technical Specifications for Highway Engineering Construction" (JTG F90-2015).

[0026] As described above, it is only the preferred specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application, according to the technical solution and its concept of the present application, makes equivalent replacements or changes, and should be covered within the protection scope of the present application.

Claims

1. A rapid installation construction method for prefabricated cable towers, characterized in that: It includes the following steps: S1: Prepare the cable tower column foot foundation; S2: Prepare the sheet assembly jig; S3: Use the sheet assembly jig to assemble the sheets to obtain the sheets; S4: Install the cable tower segments; Assemble two sheets to form a cable tower segment, and use the installation platform between the sheets to install the connecting rods between the two sheets during the installation of the cable tower segment; S5: Repeat step S4 to install the remaining cable tower segments.

2. The rapid installation construction method of an assembled cable tower according to claim 1, characterized in that: In S1, the prefabricated cable tower has a total of 16 columns. Every four columns form a group. A cable tower column foot foundation is set at the bottom of a group of cable tower columns. The steel bars in the cable tower column foot foundation extend into the top position of the pier capping beam, that is, the construction of the top of the capping beam is a full-section solid web type, so that the cable tower column foot foundation and the T-beam on the top of the capping beam form an integral body; Anti-pulling steel shapes are arranged inside the cable tower column foot foundation, and after the anti-pulling steel shapes and the top steel plates are leveled, open-hole plug welding connections are made for fixation.

3. A rapid installation construction method for an assembled cable tower according to claim 1, characterized in that: In S2, the sheet assembly jig is divided into a leveling foundation at the bottom and a leveling support frame on the leveling foundation; A circular steel plate is arranged at the top of the leveling support frame, and the openings on the steel plate are the same as the openings of the column flange plates for temporary fixation of the columns; On both sides of the sheet assembly jig, simple supports are used as the sheet assembly operation platform for workers to connect the rods at the column joint plate positions; A total of four sheet assembly jigs are set, two in a group, for assembling the sheets.

4. A rapid installation construction method for an assembled cable tower according to claim 3, characterized in that: In S3, after the construction of the sheet assembly jig is completed, the prefabricated cable tower components are transported to the site, stacked in zones, and a crane is used for sheet hoisting construction. First, install the columns on the sheet assembly jig, and after the angles are adjusted in place, temporarily fix them with drift pins. Then hoist the connecting rods between the columns to the upper joint plate positions of the columns, and manually use steel pins to connect the columns and the connecting rods on the sheet assembly operation platform. After the steel pin connection is completed, insert split pins to complete the sheet assembly; The assembled sheets are hoisted by a crane to the sheet stacking area and wait for hoisting; And repeat the steps in S3 to assemble the sheets to the corresponding number of sheets.

5. A rapid installation construction method for an assembled cable tower according to claim 4, characterized in that: The cable tower components include columns with joint plates and connecting rods; The assembled sheet includes two columns, and the two columns are connected by three horizontally arranged connecting rods and two obliquely arranged connecting rods at the upper, middle and lower positions.

6. A rapid installation construction method for an assembled cable tower according to claim 5, characterized in that: In S4, before installing the cable tower segment, first install the column feet. After the installation verticality is checked and correct, hoist the sheet to the column foot flange plate, and fix it with high-strength bolts after alignment. After two sheet segments are installed on a cable tower column foot foundation, use the installation platform between the sheets to install the connecting rods between the two sheets; The installation platform between the sheets is welded by several steel materials, with two layers. Each layer is provided with guardrails, and a ladder is provided to connect the layers; Four hanging buckles are arranged on the installation platform between the sheets, with two in the upper part and two in the lower part; The four hanging buckles can fix the installation platform between the sheets on the sheet in a way that it is fixed on two adjacent horizontally arranged connecting rods on the sheet; The installation platform between the sheets is set in a U-shaped top view. When the installation platform between the sheets is fixed on the front sheet, the sheet is located at the opening of the U shape, and both ends of the installation platform between the sheets extend to the rear side of the sheet.

7. A rapid installation construction method for an assembled cable tower according to claim 6, characterized in that: The steps of installing the connecting rod member between two sheet bodies by using the installation platform between sheet bodies include: lifting the installation platform between sheet bodies to the installation position by a tower crane, fixing the installation platform between sheet bodies to two adjacent horizontally arranged connecting rod members of the sheet body by four buckles, workers entering the installation platform between sheet bodies through a safety ladder cage, and connecting the rod members between the two sheet bodies on the platform; during the connection process, after the connecting rod member is lifted in place by the tower crane, the worker makes a steel pin connection; after all the rod members between the two sheet bodies are connected in the same way, the installation of a cable tower segment is completed. After installation, the buckle is opened, the installation platform between sheet bodies is lifted and disassembled, and the installation verticality is rechecked and found to be correct.

8. A rapid installation construction method for an assembled cable tower according to claim 6 or 7, characterized in that: The buckle includes a cross bar connecting the main body of the installation platform between sheet bodies. Two vertical bars are arranged at intervals downward at the end of the cross bar. The bottom of the rear vertical bar is hinged with a movable bar through a fixed pin. The movable bar is rotated to the bottom of the front vertical bar through the fixed pin, and the positions of the movable bar and the bottom of the front vertical bar can be fixed through a movable pin.

9. A rapid installation construction method for an assembled cable tower according to claim 1, characterized in that: During the installation process of the remaining cable tower segments, when installing to the corresponding height segment, the cross bracing is installed; after the installation of all segments and cross bracings is completed, the construction of the cable tower body is completed. Then, the top beam of the tower is arranged at the top of the cable tower body, and finally, the saddle is arranged on the top beam of the tower to complete the installation of the assembled cable tower.

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