Structure for balancing arch foot thrust generated in construction process of thrust-free arch bridge

Abstract

The utility model discloses a structure for balancing arch foot thrust generated in the construction process of a thrust-free arch bridge, which comprises an arch seat, a temporary tie bar, a bridge pier and a support, the bridge pier is a bridge lower structure, the support is arranged on the bridge pier, an arch seat of a bridge upper structure is arranged on the support, and a main chord pipe embedded section is embedded in the arch seat. The temporary tie bars are oppositely pulled and anchored on skewbacks on the two banks, and before the rigid tie bars are installed, the temporary tie bars resist arch foot thrust generated by pumping of concrete in pipes and installation of bridge floor beams, and it is guaranteed that the skewbacks do not slide. The structure for balancing the arch springing thrust generated in the non-thrust arch bridge construction process mainly aims at huge thrust generated in concrete pumping, rigid tie bar installation and cross beam installation procedures in an arch, an arch springing thrust balancing device is arranged, and the purposes that the structure is simple, safe and reliable, a main body structure is not damaged, permanent and temporary combination is achieved, operation is easy and convenient, and real-time stable control is achieved are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge construction, in particular to a structure for generating arch foot thrust during the construction process of a balanced thrust-free arch bridge. Background Art

[0002] With the development and progress of technology, the spans of various bridge types are getting larger and larger, making it possible to build highways, municipal and railways in environments such as canyons, rivers and seas. While high-grade roads are developing, road network projects are also developing. Most bridges on the road network have small spans. For example, the Pinglu Canal built in Guangxi cuts off the original local traffic and requires the construction of many bridges with small spans. Rigid tie arch bridges with supports in bridges with a span of 200m have unique advantages in terms of economy and aesthetics.

[0003] However, the construction method used for rigid tie-bar arch bridges with supports is mostly the beam-first-arch-later method, that is, first use brackets to install rigid tie bars and other bridge deck beams, then set up brackets on the beams to install arch ribs, and finally pump concrete in the pipe. However, for places with deep rivers or canyons, the bridge height is large, and the economic efficiency of bracket installation of beams and arches is poor; at this time, the arch-first-beam-later method is adopted, which can speed up the construction progress and reduce the investment in temporary facilities. However, the main problem to be solved by the arch-first-beam-later method is to balance the thrust of the arch foot. Before the rigid tie bars are formed, certain measures are taken to balance the thrust generated by the arch foot during the construction process.

[0004] The arch-first-beam-later method is used to construct a rigid tied arch bridge with supports. Basically, the arch seats and piers are temporarily consolidated. This is not applicable to bridges with high piers and limited pier operation space. In addition, during the concrete pumping process, the thrust generated by the single-end and single-side arch foot is about 2000t. The method of temporarily anchoring the arch seats and piers is very difficult to design the consolidated structure in a limited space, which is not economical and unsafe. Summary of the invention

[0005] The utility model aims to provide a structure for balancing the arch foot thrust generated during the construction of a thrust-free arch bridge, in view of the problems existing in the arch-first-beam-later method, from the aspects of structural stress, permanent and temporary combination, construction safety, and engineering quality.

[0006] The utility model is realized by adopting the following technical solutions:

[0007] A structure for generating arch foot thrust during the construction process of a balanced thrust-free arch bridge comprises an arch seat, a temporary tie rod, a pier and a support, wherein the pier is a lower structure of the bridge, the support is installed on the pier, the arch seat of the upper structure of the bridge is on the support, and a main chord pipe embedded section is embedded in the arch seat, and the characteristic is that: the temporary tie rod is tension-anchored on the arch seat on both sides, and before the rigid tie rod is installed, the temporary tie rod resists the arch foot thrust generated by the concrete pumping in the pipe and the installation of the bridge deck beam to ensure that the arch seat does not slide; when the rigid tie rod is installed, the temporary tie rod can be removed.

[0008] Further preferably, the temporary tie rod passes through the interior of the arch seat through a reserved channel formed by a pre-buried pipe, and is anchored to the back of the arch seat through an anchoring member. The pre-buried pipe is pre-buried in the arch seat, maintaining a net distance of more than cm from the top surface of the rigid tie rod.

[0009] Further preferred: the embedded pipes avoid the hanger area and maintain a certain lateral spacing, and are vertically staggered to meet the temporary tie rod tensioning space requirements. The embedded pipes are arranged between the embedded sections of the two main chord pipes, and the rear end of the embedded pipes is connected to the anchoring member; the temporary tie rod tensioning end and the anchoring end are arranged on the anchoring member on the back of the arch seat.

[0010] Further preferably, the anchoring member comprises a top plate, a web plate and an end plate, and the top plate, the web plate, the end plate and the back of the arch seat are welded to form a box-type structure, and the box is filled with concrete.

[0011] Further preferably, the end plate is used as a tension anchor pad for a temporary tie rod, and the height of the end plate is determined according to the size of the jack, and the length of the box-type structure should also be set according to the force magnitude.

[0012] The advantages of the structure that generates arch foot thrust during the construction process of the balanced thrust-free arch bridge are:

[0013] 1. A balanced arch foot thrust device is set up mainly for the huge thrust generated by the concrete pumping, rigid tie rod installation and beam installation processes in the arch, so as to achieve the purpose of simple structure, safety and reliability, no damage to the main structure, combination of permanent and temporary, easy operation and real-time stable control; the arch seat displacement is controlled by temporary tie rods, and the process is easy to operate. It only needs to monitor the state of the arch seat and automatically tension to complete the adjustment of the arch seat state. No human interference is required in the process, reducing the risk of structural failure and construction safety risks of manual participation in the locking and switching of the arch seat.

[0014] 2. An anchor member of a temporary tie rod is set on the back of the arch seat, and the steel-concrete structure arch seat with strong overall and local bearing capacity is used as the load-bearing body to ensure the safety and reliability of the structure.

[0015] 3. The anchoring components form a box-type steel structure, and the box is filled with concrete, which greatly improves the strength and stability of the anchoring components and reduces the material consumption of the anchoring components.

[0016] 4. The anchoring member is integrated with the arch seat, which does not occupy the driving space, does not affect the structural stress, and does not affect the structural space requirements. It is a permanent and temporary combination design. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the arrangement of the structure that generates the arch foot thrust during the construction process of the balanced thrust-free arch bridge;

[0018] Figure 2 It is a schematic diagram of the connection relationship between the temporary tie rod and the arch seat;

[0019] Figure 3 yes Figure 2 Schematic diagram of the left side;

[0020] Figure 4 It is the large-scale drawing of the anchoring member;

[0021] The names corresponding to the numbers in the figure are:

[0022] 1. Arch seat; 2. Embedded section of main chord; 3. Temporary tie rod; 4. Anchor member; 41. Top plate; 42. End plate; 43. Web plate; 44. Filling concrete; 5. Embedded pipe; 100. Pier; 200. Support; 300. Rigid tie rod; 400. Hanger area. DETAILED DESCRIPTION

[0023] The technical solution of the invention is clearly and completely described below in conjunction with the embodiments. The described embodiments are only a part of the present utility model, rather than all the embodiments. Example

[0024] A structure for generating arch foot thrust during the construction process of a balanced thrust-free arch bridge, comprising an arch seat 1, a temporary tie rod 3, a pier 100 and a support 200, wherein the pier 100 is a bridge substructure, the support 200 is installed on the pier 100, the support 200 is an arch seat 1 of a bridge superstructure, and a main chord pipe pre-embedded section 2 is pre-embedded in the arch seat 1, characterized in that: the temporary tie rod 3 is tension-anchored on the arch seat 1 on both sides, and before the rigid tie rod 300 is installed, the temporary tie rod 3 resists the arch foot thrust generated by the concrete pumping in the pipe and the installation of the bridge deck beam, so as to ensure that the arch seat 1 does not slide. After the rigid tie rod 300 is installed, the temporary tie rod 3 can be removed.

[0025] The temporary tie rod 3 passes through the interior of the arch seat 1 through the reserved channel formed by the embedded pipe 5, and is anchored to the back of the arch seat 1 through the anchoring member 4. The embedded pipe 5 is embedded in the arch seat 1 and maintains a net distance of more than 30 cm from the top surface of the rigid tie rod 300.

[0026] The embedded pipe 5 avoids the hanger area 400 and maintains a certain lateral spacing, and is vertically staggered to meet the space requirements for the temporary tie rod 3 tensioning. The embedded pipe 5 is arranged between the two main chord tube embedded sections 2, and the rear end of the embedded pipe 5 is connected to the anchor member 4; the tensioning end and the anchor end of the temporary tie rod 3 are arranged on the anchor member 4 on the back of the arch seat 1.

[0027] The anchoring member 4 comprises a top plate 41 , a web plate 43 and an end plate 42 . The top plate 41 , the web plate 43 , the end plate 42 and the back of the arch seat 1 are welded to form a box-type structure, and the box is filled with concrete 44 .

[0028] The end plate 42 is used as a tension anchor pad for the temporary tie rod 3. The length and height of the end plate 42 are determined according to the size of the jack. The length of the box-type structure should also be set according to the force magnitude.

[0029] The above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Any changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should fall within the protection scope of the present invention.

Claims

1. A structure for generating arch foot thrust during the construction of a balanced thrust-free arch bridge, comprising an arch seat (1), a temporary tie rod (3), a pier (100) and a support (200), wherein the pier (100) is a bridge substructure, the support (200) is mounted on the pier (100), the support (200) is an arch seat (1) of a bridge superstructure, and a main chord pipe pre-embedded section (2) is pre-embedded in the arch seat (1), characterized in that: The temporary tie rods (3) are tension-anchored on the arch seats (1) on both sides.

2. The structure for generating arch foot thrust during the construction process of a balanced thrust-free arch bridge according to claim 1, characterized in that: The temporary tie rod (3) passes through the interior of the arch seat (1) through a reserved channel formed by the embedded pipe (5) and is anchored to the back of the arch seat (1) through an anchoring component (4).

3. The structure for generating arch foot thrust during construction of a balanced thrust-free arch bridge according to claim 2, characterized in that: The embedded pipes (5) avoid the hanger area (400) and maintain a certain horizontal spacing, and are arranged in a vertical staggered manner to meet the space requirements for the temporary tie rods (3) to be tensioned. The embedded pipes (5) are arranged between the two main chord tube embedded sections (2), and the rear end of the embedded pipes (5) is connected to the anchoring member (4); the tensioning end and the anchoring end of the temporary tie rod (3) are arranged on the anchoring member (4) at the back of the arch seat (1).

4. The structure for generating arch foot thrust during construction of a balanced thrust-free arch bridge according to claim 2 or 3, characterized in that: The anchoring member (4) comprises a top plate (41), a web plate (43) and an end plate (42); the top plate (41), the web plate (43), the end plate (42) and the back of the arch seat (1) are welded to form a box-shaped structure; the box is filled with concrete (44).

5. The structure for generating arch foot thrust during construction of a balanced thrust-free arch bridge according to claim 4, characterized in that: The end sealing plate (42) serves as a tension anchor pad for the temporary tie rod (3), and the length and height of the end sealing plate (42) are determined according to the size of the jack.

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