CN110820572A - Integrated assembly construction method of prefabricated piers and main beams based on cable-stayed bridge erectors - Google Patents

Abstract

The invention belongs to the field of bridge construction engineering, and in particular relates to a construction method for the integrated assembly of prefabricated piers and prefabricated main beams based on a cable-stayed bridge erecting machine. The factory prepares the components, assembles and fixes the bridge erecting machine on the construction site, and erects the bridge on the construction site. The prefabricated pier segment, prefabricated cap beam and prefabricated main girder are transported into place by the pulley, firstly, the assembly of the prefabricated pier segment and the prefabricated cap girder at the front end of the bridge erection machine are completed, and then the front end of the bridge erection machine is supported and anchored on the top of the cap girder , complete the transportation and erection of the prefabricated main girder, and finally complete the integrated erection of the prefabricated main girder and the prefabricated piers. The invention is easy to install, simple to construct, and has reliable connection between the bridge erecting machine and the bridge, solves the technical problem of difficult transportation and hoisting of prefabricated pier segments and prefabricated main beams in the construction of prefabricated high-pier bridges in complex mountainous environment, and can speed up The speed of bridge construction has significant economic benefits.

Description

Integrated assembly construction method of prefabricated piers and main beams based on cable-stayed bridge erectors

technical field

The invention belongs to the field of bridge construction engineering, in particular to an integrated assembly construction method of a prefabricated bridge pier and a prefabricated main beam based on a cable-stayed bridge erector, and also relates to a cable-stayed bridge erector. The invention is suitable for the integrated construction of prefabricated piers and prefabricated main beams.

Background technique

In the context of the rapid development of today's society, traffic restrictions will cause huge economic losses. Therefore, the problem encountered in bridge reconstruction at key nodes of the urban road network is no longer the bridge itself, but how to reduce the impact on traffic. The rapid bridge construction technology has emerged as the times require. Compared with the traditional bridge construction method, it has many advantages such as good quality and durability of component factory processing, low construction safety risk, low dust and noise pollution, increased construction speed, and small impact on traffic.

At present, the existing projects using bridge prefabricated assembly technology to assemble bridge piers are mostly medium and low piers with fewer assembly segments, and most of the construction sites are in open areas of the construction site, so there is no need to consider the limitations of transportation and hoisting construction machinery; Under complex terrain conditions such as mountainous areas, the piers of the bridges to be constructed are relatively high, and it is difficult for large-scale transportation and hoisting equipment to enter the construction site. Based on the above problems, it is necessary to provide a construction method for the integrated assembly of prefabricated piers and prefabricated main beams based on a cable-stayed bridge erector.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an integrated assembly construction method of prefabricated piers and prefabricated main beams based on a cable-stayed bridge erector, which can realize the rapid assembly construction of prefabricated high-pier bridges in a complex environment in mountainous areas; the present invention Another object of the invention is to provide a cable-stayed bridge erecting machine.

The technical solutions provided by the present invention to achieve the above objects are as follows: an integrated assembly and construction method for prefabricated bridge piers and prefabricated main beams based on a cable-stayed bridge erection machine; Construction of hat beam and prefabricated main beam: factory prepares components, assembles and fixes bridge erecting machine on construction site, and erects bridge on construction site; the details are:

Step 1. The factory prepares the components;

1.1 Prepare the components of the cable-stayed bridge structure: main truss, cable tower, stay cable, high-strength steel rod, bolt, A block, B block, C block, D block, main lifting mechanism, upper I-beam, lower I-beam ; Each of the four pulleys is equipped with a main lifting mechanism;

1.2 Prepare bridge components: prefabricated pier segments, prefabricated cap beams and prefabricated main beams.

Step 2. Assemble the fixed bridge erecting machine on the construction site;

The lower I-beams are erected at the front and rear ends of the longitudinal direction of the bridge along the horizontal direction of the built bridge segment, the main truss is assembled on the lower I-beam, and the rear anchor point and the fulcrum of the cable tower are fixed by high-strength steel rods and bolts On the bridge segment that has been built; then four groups of upper I-beams are installed on the main truss, and each group of upper I-beams is slidably connected to the main truss and can move longitudinally along the main truss, and the cable tower is installed on the main truss. , the cable tower is fixedly connected with the main truss by the stay cable; the A pulley, B pulley, C pulley and D pulley, which are respectively equipped with the main lifting mechanism, are installed on the four sets of upper I-beams in sequence from the front end, and the A pulley , B pulley is located in front of the cable tower, C pulley and D pulley are located behind the cable tower; the four pulleys can slide longitudinally or laterally on the upper I-beam. When constructing the first span, the cable-stayed bridge erection machine can be installed and fixed on the roadbed for construction, which is not repeated here.

Step 3. Build bridges at the construction site;

3.1 Assembly of prefabricated pier segments: the beam transporter is used to transport the prefabricated pier segments to the front end of the beam, the B pulley is moved to the front end of the beam through the main truss, and the main lifting mechanism is lowered to lift the prefabricated pier segment, and then move forward to the pier position, Lower the prefabricated pier segments for assembly construction, and repeat this step to complete the construction of other segments of the pier.

3.2 Installation and construction of prefabricated cap beams: The prefabricated cap beams are hoisted after the construction of the pier segments is completed. The prefabricated cap beams are assembled in the same way as in step 3.1; the above steps are repeated until the construction of all the substructures of the bridge is completed, and then the prefabricated cap beams are put down. The front fulcrum support is anchored on the prefabricated cap beam to prepare for the construction of the prefabricated main beam.

3.3 Main beam installation and construction: The beam transporter transports the prefabricated main beam to the hoisting position. First, the prefabricated main beam is hoisted by the C pulley and the D pulley, and moves forward slowly until the front end of the prefabricated main beam is sent to the other side of the cable tower. , B pulley lifts, C pulley temporarily quits work, idling to the vicinity of D pulley to lift again, D pulley pulls out of work; at this time, the prefabricated main beam is jointly lifted by B pulley and C pulley and continues to move forward, when C pulley moves to the cable tower, The A pulley takes over the B pulley, the B pulley idles to the cable tower to take over the C pulley, the C pulley quits work, and the A pulley and the B pulley hoist the prefabricated main beam to the design position and then drop the beam; ensure the hoisting position is accurate.

After completing the integrated construction of the prefabricated main girder and prefabricated piers of this span, move the bridge erection machine forward to the next span and repeat step 3 to complete the construction of the entire prefabricated bridge span by span.

A cable-stayed bridge erecting machine, comprising a main truss, a cable tower, a cable-stayed cable and a pulley equipped with a main lifting mechanism, is characterized in that: it also includes a lower I-beam and an upper I-beam; the pulley is four sets; Or at the longitudinal front and rear ends of the built bridge segment, there are lower I-beams along the transverse direction of the bridge, the main trusses are installed on the lower I-beams, and four groups of upper I-beams and upper I-beams are installed scattered on the main trusses. The steel is slidingly connected with the main truss and can move longitudinally along the main truss. A cable tower is installed on the main truss and between the upper I-beams of the second group and the third group, and the cable tower is fixedly connected with the main truss by stay cables; And the fulcrum of the cable tower is fixed on the built bridge segment by high-strength steel rods and bolts, and the pulleys are respectively installed on the four sets of upper I-beams before and after the cable tower.

The front end of this article refers to the forward direction of building the bridge.

The present invention transports the prefabricated bridge pier segments, the prefabricated cap beams and the prefabricated main beams in place by means of a pulley, firstly completes the assembly of the prefabricated bridge pier segments and the prefabricated cap beams at the front end of the bridge erecting machine, and then anchors the front end support of the bridge erecting machine to the cap. On the top of the beam, complete the transportation and erection of the prefabricated main beam, and finally complete the integrated erection of the prefabricated main beam and the prefabricated pier.

In the prior art, the bridge erection machine is only used to complete the construction of the prefabricated main beam, and the present invention realizes that the prefabricated bridge pier, the prefabricated cap beam and the prefabricated main beam are all constructed by the cable-stayed bridge erection machine. The invention is easy to install, simple to construct, and the bridge erection machine is reliably connected to the bridge, which solves the technical problem of difficult transportation and hoisting of prefabricated pier segments and prefabricated main beams in the construction of high-pier bridges in complex mountainous environments, and can speed up the bridge construction process. The construction speed has significant economic benefits.

Description of drawings

Fig. 1 is the isometric view of the present invention;

2 is a schematic elevational view of the present invention;

Fig. 3 is the side view of Fig. 1;

Figure 4 is the lifting diagram of the prefabricated pier;

Fig. 5 is the assembly drawing of the prefabricated pier in place;

Fig. 6 is the drawing of D block and C block lifting the prefabricated beam;

Fig. 7 is the drawing of lifting the prefabricated beam by the D pulley and the B pulley;

Figure 8 is a diagram of a prefabricated beam lifted by a C block and a B block;

Fig. 9 is the forward movement diagram of the prefabricated beam;

Figure 10 is a drawing of the prefabricated beams lifted by the C block and the A block;

Figure 11 is a diagram showing the lifting of the prefabricated beam by the B pulley and the A pulley;

Figure 12 is a diagram of the prefabricated beam moving forward;

Figure 13 is the installation diagram of the prefabricated beam.

In the picture: 1—prefabricated pier, 2—prefabricated cap beam, 3—prefabricated main girder, 4—high-strength steel rod, 5—bolt, 6—main truss of bridge erecting machine, 7—cable tower, 8—stayed cable, 9 -A block, 10—B block, 11—C block, 12—D block, 13—rear anchor point, 14—tower fulcrum, 15—front fulcrum, 16—upper I-beam, 17—lower I-beam, 18 - main lifting hook, 19 - prefabricated pier segment, 20 - completed bridge segment.

Detailed ways

Method embodiment; an integrated assembly construction method for prefabricated piers and prefabricated main beams based on a cable-stayed bridge erecting machine; this embodiment takes the construction process of a 40m simply supported prefabricated T beam (ie, a prefabricated main beam) as an example, and the segmental height of the prefabricated piers is 2.0 m, T beam beam height 2.5m. Proceed as follows:

Step 1. The factory prepares the components;

1.1 Prepare the components of the cable-stayed bridge structure: main truss 6, cable tower 7, stay cable 8, high-strength steel rod 4, bolt 5, A pulley 9, B pulley 10, C pulley 11, D pulley 12, main lifting mechanism 18 , upper I-beam 16, lower I-beam 17; each of the four pulleys is equipped with a main lifting mechanism, and the four pulleys are of the same model;

1.2 Prepare bridge components: prefabricated pier segments 19, prefabricated cap beams 2 and prefabricated T beams 3, and other installation tools.

Step 2. Assemble the fixed bridge erecting machine on the construction site;

Referring to Figures 1 to 4; along the built bridge segment 20, lower I-beams 17 are erected at the front and rear ends of the longitudinal direction of the bridge respectively, the main truss 6 is assembled on the lower I-beam, and the rear anchor points 13 And the fulcrum 14 of the cable tower is fixed on the built prefabricated T beam 3 through the high-strength steel rod 4 and the bolt 5; Four groups of upper I-beams 16 are installed on the main truss 6, and the upper I-beams 16 of each group are slidably connected with the main truss 6 and can move longitudinally along the main truss 6. On the main truss 6, the second group and the third group A cable tower 7 is installed between the upper I-beams 16, the cable tower 7 is 5m away from the front end of the beam, and the cable tower 7 is fixedly connected with the main truss 6 by the stay cable 8; The pulley 10, the C pulley 11 and the D pulley 12 are sequentially installed on the four sets of upper I-beams from the front end of the beam. The I-beam 16 slides longitudinally along the main truss 6, so that the four pulleys can slide longitudinally along the main truss 6 with the upper I-beam 16, or can slide laterally on the upper I-beam 16; the lower I-beam 17 is slightly larger than The width of the bridge ensures that there is enough construction space in the lateral direction.

Step 3. Build bridges at the construction site;

3.1 Assembly of prefabricated pier segments: refer to Figures 4 and 5; first, the prefabricated pier segment 19 is transported to the front end of the beam by a beam transporter, the B pulley 10 is moved to the front end of the beam through the main truss 6, and the main lifting mechanism 18 is lowered to hoist the prefabricated pier After the bridge pier segment 19, move forward to the design position of the bridge pier 1, lower the prefabricated bridge pier segment 19 for assembling construction, and repeat this step to complete the construction of other prefabricated bridge pier segments.

3.2 Prefabricated cap girder installation and construction: After the prefabricated pier segment is completed, the prefabricated cap girder 2 is hoisted. The prefabricated cap girder 2 is assembled in the same way as the prefabricated pier segment in step 3.1; repeat the above steps until the construction of all substructures of the bridge is completed. After that, put down the front fulcrum 15, and anchor the support on the prefabricated cap beam 2 to prepare for the construction of the main beam; at this time, the force system of the cable-stayed bridge erection machine changes, and the original cable is the main force-bearing member. The truss is the main stress member. The rear anchor point 13 , the pylon fulcrum 14 and the front fulcrum 15 support the bridge erecting machine on the prefabricated main beam 3 .

3.3 Installation and construction of the main beam: Because the cable tower 7 is fixed on the main truss 6, the pulley cannot move freely longitudinally in the entire main truss 6 range. The procedure of installation and construction of the main beam is as follows: the beam transporter transports the prefabricated main beam 3 to the hoisting position, see Figure 6, Figure 7 and Figure 8; Move forward. After the front end of the prefabricated main beam 3 is sent to the other side of the cable tower, the B pulley 10 is lifted, the C pulley 11 is temporarily withdrawn from work, the C pulley 11 is idling to the D pulley 12 and re-hoisted, and the D pulley 12 is withdrawn from work; see figure 9. Figure 10 and Figure 11; at this time, the prefabricated main beam 3 is jointly hoisted by the B pulley 10 and the C pulley 11 and continues to move forward. When the C pulley 11 moves close to the cable tower 7, the A pulley 9 replaces the B pulley 10, and the B pulley 10 Temporarily quit the work, B pulley idling to the position close to the cable tower 7 to take over the C pulley 11, C pulley 11 quit work, see Figure 12 and Figure 13; after the prefabricated main beam 3 is hoisted by the A pulley 9 and the B pulley 10 to the design position The drop beam is installed in place; that is, the four pulleys work alternately to complete the construction of the prefabricated main beam.

After completing the integrated construction of the prefabricated main girder 3 and the prefabricated pier 1 of this span, move the bridge erecting machine forward to the next span and repeat step 3. When the prefabricated main girder 3 is hoisted in the subsequent construction, the lower I-beam 17 can be used for hoisting. Move laterally to complete the construction of the entire prefabricated bridge span by span.

Example of bridge erecting machine; as shown in Figure 1, Figure 2 and Figure 3: a cable-stayed bridge erecting machine provided by the present invention includes a main truss 6, a cable tower 7, a stay cable 8 and a main lifting mechanism. The pulley also includes the lower I-beam 17 and the upper I-beam 16; the pulley is four sets; at the longitudinal front and rear ends of the built bridge segment 20, the lower I-beam 17 is provided along the transverse direction of the bridge, and the lower I-beam is provided. The main truss 6 is installed on the I-beam, and four groups of upper I-beams 16 are scattered on the main truss 6. The upper I-beam 16 is slidably connected with the main truss 7 and can move longitudinally along the main truss 6. Above the main truss 6, the second The cable tower 7 is installed between the upper I-beam 16 of the group and the third group, and the cable tower 7 is fixedly connected with the main truss 6 by the stay cable 8; On the bridge segment 20 that has been built, pulleys are respectively installed on the four groups of upper I-beams 16 before and after the cable tower 7 , and each pulley is connected laterally with its corresponding upper I-beam 16 . A pulley 9 is installed on the upper I-beam of the first group, B pulley 10 is installed on the upper I-beam of the second group, C pulley 11 is installed on the upper I-beam of the third group, and D pulley is installed on the upper I-beam of the fourth group. 12.

The main truss 6 is provided with a rear anchor point 13, a pylon fulcrum 14 and a front fulcrum 15, and the bridge erecting machine is supported on the built bridge segment 20 through the rear anchor point 13 and the pylon fulcrum 14, and passes through the front fulcrum 15. It is supported on the prefabricated hat beam 2 at the front end.

Claims (4)

1. A prefabricated bridge pier and prefabricated main beam integrated assembly construction method based on a cable-stayed bridge erecting machine; it is characterized in that using a cable-stayed bridge erecting machine to carry out the prefabricated bridge pier (1), the prefabricated cap beam (2) and the Prefabricated main beam (3) Construction: The factory prepares the components, assembles the fixed bridge erecting machine on the construction site, and erects the bridge on the construction site. 2. a kind of prefabricated bridge pier and prefabricated main beam integrated assembly construction method based on cable-stayed bridge erecting machine as claimed in claim 1; It is characterized in that: Step 1. The factory prepares the components; 1.1 Prepare the components of the cable-stayed bridge structure: main truss (6), cable tower (7), stay cable (8), high-strength steel rod (4), bolt (5), A pulley (9), B pulley (10 ), C pulley (11), D pulley (12), main lifting mechanism (18), upper I-beam (16), lower I-beam (17); each of the four pulleys is equipped with a main lifting mechanism; 1.2 Prepare bridge components: prefabricated pier segments (19), prefabricated cap beams (2) and prefabricated main beams (3); Step 2. Assemble the fixed bridge erecting machine on the construction site; The lower I-beams (17) are respectively erected at the front and rear ends of the longitudinal direction of the bridge along the built bridge segment (20), the main truss (6) is assembled on the lower I-beams (17), and the rear anchors The point (13) and the pylon (14) are fixed on the built bridge segment (3) by high-strength steel rods (4) and bolts (5); The beams (16), the upper I-beams (16) of each group are all slidingly connected with the main truss (6), and can move longitudinally along the main truss (6). On the main truss (6), the second group and the third group A cable tower (7) is installed between the upper I-beams (16), and the cable tower (7) is fixedly connected with the main truss (6) by the stay cable (8); each is equipped with an A pulley of the main lifting mechanism (18). (9), B pulley (10), C pulley (11) and D pulley (12) are sequentially installed on the four sets of upper I-beams (16) from the front end; A pulley (9), B pulley (10) are located at In front of the cable tower (7), the C pulley (11) and the D pulley (12) are located behind the cable tower (7); the four pulleys can slide longitudinally or laterally on the upper I-beam (16); Step 3. Build bridges at the construction site; 3.1 Assembly of prefabricated bridge pier segments: the prefabricated bridge pier segment (19) is transported to the front end of the beam by the beam transporter, the B pulley (10) is moved to the front end of the beam through the main truss (6), and the main lifting mechanism (18) is lowered to hoist the prefabricated bridge. After the pier segment (19), move forward to the position of the pier (1), lower the prefabricated pier segment (19) for assembling construction, and repeat this step to complete the construction of other pier segments; 3.2 Installation and construction of prefabricated cap beams: The prefabricated cap beams (2) are hoisted after the pier sections are completed. The prefabricated cap beams (2) are assembled in the same way as in step 3.1; the above steps are repeated until all the lower parts of the bridge are completed. After the construction of the structure, lower the front fulcrum (15) to support and anchor it on the prefabricated cap beam (2) to prepare for the construction of the prefabricated main beam (3); 3.3 Installation and construction of the main beam: The beam transporter transports the prefabricated main beam (3) to the hoisting position, first lifts the prefabricated main beam (3) through the C pulley (11) and the D pulley (12), moves forward slowly, and waits for After the front end of the prefabricated main beam (3) is sent to the other side of the cable tower, the B pulley (10) is lifted, the C pulley (11) is temporarily withdrawn from work, idling to the vicinity of the D pulley (12) to be lifted again, and the D pulley (12) is withdrawn from work ;At this time, the prefabricated main beam (3) is jointly hoisted by the B block (10) and the C block (11) and continues to move forward. When the C block (11) moves to the tower, the A block (9) takes over the B block (10). , B pulley (10) idles to the cable tower to replace C pulley (11), C pulley (11) quits work, and the prefabricated main beam (3) is hoisted by A pulley (9) and B pulley (10) to the design position and then falls. Beam; ensure the hoisting position is accurate. 3. A cable-stayed bridge erecting machine, comprising a main truss, a cable tower, a stay cable and a pulley equipped with a main lifting mechanism, characterized in that it also includes a lower I-beam (17) and an upper I-beam (16) ; There are four sets of pulleys; Lower I-beams (17) are arranged at the front and rear ends of the built bridge segment (20) in the longitudinal direction and along the transverse direction of the bridge, and the main trusses (6) are installed on the lower I-beams (17). , Four sets of upper I-beams (16) are scattered on the main truss (6), and the upper I-beams (16) are slidingly connected with the main truss (7) and can move longitudinally along the main truss (6). The main truss (6) A cable tower (7) is installed between the upper, second and third groups of I-beams (16), and the stay cable (8) is fixedly connected to the cable tower (7) and the main truss (6); 13) and the fulcrum of the cable tower (14) are fixed on the built bridge segment (20) through high-strength steel rods (4) and bolts (5). ) are respectively installed on the pulleys, and each pulley is connected with its corresponding upper I-beam (16) in a lateral sliding connection. 4. A cable-stayed bridge erecting machine according to claim 3, characterized in that: the main truss is provided with a rear anchor point (13), a pylon fulcrum (14) and a front fulcrum (15), and the bridge erecting machine passes through The rear anchor point (13) and the tower fulcrum (14) are supported on the built bridge segment (20), and are supported on the prefabricated cap beam (2) at the front end through the front fulcrum (15).

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