A self-anchored tower construction method for installing a steel structure bridge

Abstract

The present application relates to a kind of steel structure bridge installation self-anchored tower construction method.The present application includes front cable, tower, tower anchor beam, rear cable, rear anchor point, steel anchor box, steel strand, steel anchor beam and P anchor and so on several parts.Tower is set on bridge pile cap and is rigidly connected with steel beam, tower anchor beam is set on tower and forms a whole with tower, two ends are set front cable, rear cable anchoring device respectively, for adjusting cable force and bridge linear.After anchor point is set on the outside of steel beam end beam, for anchoring rear cable, steel anchor box is set in the inside of steel beam end beam, for anchoring steel strand.P anchor is embedded on pile cap when bridge pier pile cap is constructed, steel anchor beam is connected with embedded P anchor, one end of steel strand passes through the hole of steel beam bottom plate and is anchored with steel anchor box, the other end is anchored with steel anchor beam, forms rear cable counterforce transmission system.The present application solves the problem that ground anchor cannot be set, construction technology is mature, safety is high, can satisfy the bridge construction requirement of similar working condition.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel structure bridge installation construction, in particular to a self-anchored tower construction method for steel structure bridge installation. BACKGROUND

[0002] The large-span steel structure bridge is generally located in the places such as across the sea, across the river, across the lake, across the valley, and its structural form is also various, which can be divided into beam bridge, arch bridge, suspension bridge, cable-stayed bridge, rigid truss bridge and combined system bridge according to the stress system. The on-site installation of the bridge involves the hoisting of the segment, the suspension bridge is large in span and good in navigation condition, the hoisting is completed by using the bridge deck crane provided by the main cable of the bridge, the cable-stayed bridge is also large in span and good in navigation condition, and the installation is completed by using the crane provided on the bridge. For the bridges such as arch bridge and steel truss bridge which do not have the installation method similar to the suspension bridge and the cable-stayed bridge, the cantilever assembly is generally adopted due to the complex geographical location of the bridge site and the limited traffic, and the incremental launching construction method and the cantilever assembly construction method are generally adopted.

[0003] As shown in Figure 1 , the current construction method of the cantilever assembly steel structure bridge sets the tower by calculating the size of the rear anchor force to set the rear anchor point on the structure on the ground, or to set the rear anchor structure on the ground. However, for the case that the rear anchor point cannot be implemented on the ground or the ground structure, how to complete the cantilever assembly of the bridge is a problem to be solved urgently. SUMMARY

[0004] Therefore, the technical problem to be solved by the present application is to overcome the problem in the prior art that how to set the rear anchor point on the steel structure bridge body to form a self-anchored stress system to complete the cantilever assembly of the bridge when the rear anchor point cannot be implemented on the ground or the ground structure.

[0005] In order to solve the above technical problem, the present application provides a self-anchored tower construction method for steel structure bridge installation, which comprises the following steps:

[0006] S1: calculating the force borne by the front and rear cables in the tower construction system according to the arch rib segment division and the hoisting scheme;

[0007] S2: respectively manufacturing the tower anchor beam, the tower, the front cable, the rear cable, the rear anchor point, the steel anchor box, the steel anchor beam and the P anchor according to the force borne by the front and rear cables;

[0008] S3: constructing the first and second piers, pre-burying the P anchor during the construction of the first pier, and connecting the steel anchor beam with the P anchor after the concrete curing period;

[0009] S4: hoisting the steel beam end cross beam to the first pier and installing the steel beam bridge deck between the first and second piers.

[0010] S5: installing the buckle tower and the buckle tower anchor beam on the second pier, and arranging the cable wind rope at the position of the buckle tower;

[0011] S6: installing the steel strand between the steel anchor box of the steel anchor beam and the steel beam end cross beam, so as to form a channel for transmitting the vertical component force of the back cable to the pile foundation;

[0012] S7: anchoring the first pair of front cable and back cable at the two ends of the buckle tower anchor beam respectively, hingedly connecting the other end of the back cable to the back anchor point, hoisting the first section of the steel arch rib, and hingedly connecting the other end of the front cable to the arch rib section;

[0013] S8: positioning the interface of the arch rib section, adjusting the cable force of the front cable and the back cable, and welding the interface of the arch rib section;

[0014] S9: repeating steps S7 to S8 until the installation and closing of all arch rib sections are completed.

[0015] In an embodiment of the present application, in step S4, the method for installing the steel beam bridge deck between the first pier and the second pier comprises: installing the back anchor point on the outer side of the steel beam end cross beam, installing the steel anchor box on the inner side of the steel beam end cross beam, completing the steel beam bridge deck between the steel beam end cross beam and the first pier to the second pier, so as to form a channel for transmitting the horizontal component force of the back cable to the second pier.

[0016] In an embodiment of the present application, in step S5, the cable wind rope is arranged on both sides of the buckle tower.

[0017] In an embodiment of the present application, in step S8, when the arch rib linear shape reaches a set value, the interface of the arch rib section is welded, and after the welding is completed, the front cable and the back cable are adjusted again and the linear shape is corrected.

[0018] The above technical solution of the present application has the following advantages compared with the prior art:

[0019] The steel structure bridge installation self-anchored buckle tower construction method solves the problem that the back anchor point cannot be implemented on the ground or ground structure.

[0020] The present application designs the buckle tower system through the self-anchored structure, effectively transmits the vertical force generated in the construction process to the pile foundation through the back cable, the back anchor point, the steel anchor box, the steel strand, the steel anchor beam and the P anchor in turn according to the structural characteristics of the bridge, the horizontal force is basically balanced on both sides of the second pier, the bending moment generated by the horizontal force on the first pier is eliminated, and the arch rib is installed smoothly.

[0021] The present application sets the rear anchor point at a certain position of the steel structure bridge, the horizontal component force generated by the rear cable is transmitted to the steel beam at the steel and concrete combined segment of the tower position, and the horizontal component force generated by the front cable is transmitted to the steel and concrete segment of the tower position, which can offset to a certain extent, the vertical downward component force generated at the tower position is transmitted to the pier at the tower position, the prestressed steel strand is preset at the pier at the rear anchor point, and the prestressed steel strand connected with the rear anchor point balances the vertical upward component force at the position. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to make the content of the present application more easily understood, the present application will be further described in detail below according to specific embodiments of the present application and in conjunction with the drawings, in which

[0023] Figure 1 is a schematic diagram of the current steel structure bridge arm construction tower construction.

[0024] Figure 2 is a schematic diagram of the self-anchored tower construction of the steel structure bridge arm construction of the present application.

[0025] Figure 3 is Figure 2 is a sectional view along the A-A direction.

[0026] Figure 4 is a schematic diagram of the structure of the tower anchor beam.

[0027] Figure 5 is Figure 4 is a sectional view along the 1-1 direction.

[0028] Figure 6 is Figure 4 is a sectional view along the 2-2 direction.

[0029] Figure 7 is a schematic diagram of the rear anchor point and the steel anchor box.

[0030] Figure 8 is a schematic diagram of the steel anchor beam.

[0031] Figure 9 is a schematic diagram of the P anchor.

[0032] The drawing of the specification is explained as follows: 01, first bridge pier; 02, second bridge pier; 1, front cable; 2, tower; 3, tower anchor beam; 4, rear cable; 5, rear anchor point; 6, steel strand; 7, steel anchor box; 8, steel anchor beam; 9, P anchor; 10, steel beam; 11, steel beam end beam; 12, cable wind rope; 13, arch rib segment. DETAILED DESCRIPTION

[0033] The present application will be further described below in conjunction with the drawings and specific embodiments so that those skilled in the art can better understand and implement the present application, but the embodiments are not intended to limit the present application.

[0034] Referring to Figures 2 to 9 The steel structure bridge installation self-anchor type buckle tower construction method of the present application comprises the following steps:

[0035] S1: Calculate the force borne by the front cable 1 and the rear cable 4 in the buckle tower construction system according to the arch rib segment 13 division and hoisting scheme, the minimum force borne by the front cable 1 is 850 KN, and the maximum force borne by the front cable 1 is 2800 KN, the minimum force borne by the rear cable 1 is 800 KN, and the maximum force borne by the rear cable 1 is 3200 KN;

[0036] S2: Manufacture the buckle tower anchor beam 3, the buckle tower 2, the front cable 1, the rear cable 4, the rear anchor point 5, the steel anchor box 7, the steel anchor beam 8 and the P anchor 9 respectively according to the force borne by the front cable 1 and the rear cable 4;

[0037] S3: Construct the first bridge pier 01 and the second bridge pier 02, pre-bury the P anchor 9 in the construction process of the first bridge pier 01, and bolt the steel anchor beam 8 and the P anchor 9 after the concrete curing period;

[0038] S4: Hoist the steel beam end cross beam 11 to the first bridge pier 01, install the steel beam bridge deck between the first bridge pier 01 and the second bridge pier 02, install the rear anchor point 5 on the outer side of the steel beam end cross beam 11, install the steel anchor box 7 on the inner side of the steel beam end cross beam 11, complete the installation of the steel beam bridge deck between the steel beam end cross beam 11 and the first bridge pier 01 and the second bridge pier 02, and form a channel for transmitting the horizontal component force of the rear cable 4 to the second bridge pier 02;

[0039] S5: Install the buckle tower 2 and the buckle tower anchor beam 3 on the second bridge pier 02, and set the cable wind rope 12 at the position of the buckle tower 2;

[0040] S6: Install the steel strand 6 between the steel anchor beam 8 and the steel anchor box 7 of the steel beam end cross beam 11, and form a channel for transmitting the vertical component force of the rear cable 4 to the pile foundation;

[0041] S7: Anchor the first pair of front cable 1 and rear cable 4 at both ends of the buckle tower anchor beam 3 respectively, hinge the other end of the rear cable 4 to the rear anchor point 5, hoist the first segment of steel arch rib, and hinge the other end of the front cable 1 to the arch rib segment 13;

[0042] S8: Interface positioning of the arch rib segment 13, adjustment of the cable force of the front cable 1 and the rear cable 4, welding of the interface of the arch rib segment 13 after the arch rib linear shape reaches the set value, and again adjustment of the front cable 1 and the rear cable 4 and correction of the linear shape after the welding is completed.

[0043] S9: repeat steps S7 to S8 until the installation and closing of all arch rib segments 13 are completed.

[0044] The self-anchored structure design buckling tower system effectively transfers the vertical force generated in the construction process through the post cable, the post anchor point, the steel anchor box, the steel strand, the steel anchor beam and the P anchor to the pile foundation in turn according to the structure characteristics of the bridge, the horizontal force is basically balanced on both sides of the second bridge pier, the bending moment generated by the horizontal force on the first bridge pier is eliminated, and the arch rib is installed smoothly.

[0045] Specifically, in step S5, the cable wind rope 12 is arranged on both sides of the buckling tower 2.

[0046] The present application sets the post anchor point at a certain position of the steel structure bridge, the horizontal component force generated by the post cable is transmitted to the steel and concrete combined segment steel beam at the buckling tower position, and the horizontal component force generated by the front cable is transmitted to the steel and concrete segment steel beam at the buckling tower position, which can offset to a certain extent, the vertical downward component force generated at the buckling tower position is transmitted to the bridge pier at the buckling tower position, the bridge pier is provided with a prestressed steel strand at the post anchor point, the prestressed steel strand is connected with the post anchor point to balance the vertical upward component force at the position.

[0047] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the examples, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A construction method for installing self-anchored towers on steel structure bridges, characterized in that, Includes the following steps: S1: Calculate the forces borne by the front cable (1) and rear cable (4) in the tower construction system based on the division of the arch rib segment (13) and the hoisting scheme; S2: Based on the forces borne by the front cable (1) and the rear cable (4), respectively construct the anchor beam (3), anchor tower (2), front cable (1), rear cable (4), rear anchor point (5), steel anchor box (7), steel anchor beam (8) and P anchor (9); S3: Construct the first pier (01) and the second pier (02). During the construction of the first pier (01), pre-embed P anchors (9). After the concrete curing period is reached, bolt the steel anchor beam (8) to the P anchors (9). S4: Hoist the steel beam end crossbeam (11) onto the first pier (01), and install the steel beam bridge deck between the first pier (01) and the second pier (02); S5: Install the anchor tower (2) and anchor tower anchor beam (3) on the second pier (02), and set the guy rope (12) at the position of the anchor tower (2); S6: Install steel strands (6) between the steel anchor box (7) of the steel anchor beam (8) and the steel beam end crossbeam (11) to form a channel for transmitting the vertical component of the back cable (4) to the pile foundation; S7: Anchor one end of the front cable (1) at one end of the anchor beam (3), anchor one end of the rear cable (4) at the other end of the anchor beam (3), and hinge the other end of the rear cable (4) to the rear anchor point (5), hoist the first section of steel arch rib, and hinge the other end of the front cable (1) to the arch rib section (13). S8: Position the arch rib segment (13) at the interface, adjust the cable force of the front cable (1) and the rear cable (4), and weld the interface of the arch rib segment (13); S9: Repeat steps S7 to S8 until all arch rib segments (13) are installed and closed.

2. The construction method for installing self-anchored towers on steel structure bridges according to claim 1, characterized in that, In step S4, the method of installing the steel beam bridge deck between the first pier (01) and the second pier (02) includes: installing the rear anchor point (5) on the outside of the steel beam end crossbeam (11), installing the steel anchor box (7) on the inside of the steel beam end crossbeam (11), and then installing the steel beam end crossbeam (11) and the steel beam bridge deck between the first pier (01) and the second pier (02) to form a channel for transmitting the horizontal component of the rear cable (4) to the second pier (02).

3. The construction method for installing self-anchored towers on steel structure bridges according to claim 1, characterized in that, In step S5, the guy rope (12) is placed on both sides of the buckle tower (2).

4. The construction method for installing self-anchored towers on steel structure bridges according to claim 1, characterized in that, In step S8, after the arch rib profile reaches the set value, the interface of the arch rib segment (13) is welded. After the welding is completed, the front cable (1) and the rear cable (4) are adjusted again and the profile is corrected.

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