A bridge underpass support device and construction method under low clearance

Abstract

This invention relates to a bridge underpinning support device and construction method under low clearance conditions. φ900 steel pipe columns support crossbeams, longitudinal beams, and connecting beams on both sides of the piers of the bridge section to be underpinned. The longitudinal and crossbeams are fixed using limiting devices. Distribution beams and stiffening plates are symmetrically installed below the crossbeams. Jacks and φ609 steel pipe columns are symmetrically installed between the distribution beams and stiffening plates and the bridge, with the jacks installed upside down. A conversion cap is installed between the jacks and the φ609 steel pipe columns. This invention solves the problem of limited clearance under existing bridges, making traditional component hoisting methods unusable. By breaking down the bridge support into smaller parts, the original elevation is lowered by 2-3 meters. Multiple replacements of jacks, conversion sections, and standard sections are used to raise the support to the original elevation, meeting the requirements for bridge underpinning construction. Through modular adaptive adjustment, the installation difficulties of underpinning supports under existing operating bridges are successfully solved.

Description

Technical Field

[0001] This invention relates to a bridge underpinning support device and construction method in a limited space, mainly used for bridge underpinning construction in areas with small construction sites, limited space, and high requirements for the protection of surrounding buildings. Background Technology

[0002] With the progress and development of the times, bridges play a vital role in urban transportation systems. Simultaneously, the demand for upgrading and renovating urban infrastructure, especially the construction of underground projects, has increased, leading to a severe shortage of land and space resources. Therefore, addressing the protection and harmonious coexistence of newly constructed underground projects with existing bridges is a reflection of contemporary social progress, sustainability, and rational development. Existing bridges often have limited clearance and require uninterrupted traffic flow. Therefore, it is imperative to complete the jacking and replacement of existing bridges and pile foundation modifications within limited time and space. This necessitates the research and development of suitable devices and construction methods for bridge replacement supports in areas with low clearance. Summary of the Invention

[0003] The purpose of this invention is to provide a bridge underpinning support device and construction method under low clearance conditions, which is used for bridge underpinning construction in areas with limited space and high requirements for the protection of surrounding buildings.

[0004] To achieve the above objectives, the technical solution of the present invention is: a bridge underpinning support device under low clearance, comprising steel pipe columns, inter-column supports, crossbeams, longitudinal beams, connecting beams, distribution beams and stiffening plates, jacks, conversion sections, standard sections, and limiting devices. φ900 steel pipe columns are used to support the crossbeams, longitudinal beams, and connecting beams on both sides of the piers of the bridge section to be underpinned. The longitudinal beams and crossbeams are fixed by limiting devices. Distribution beams and stiffening plates are symmetrically arranged below the crossbeams. Jacks and φ609 steel pipe columns are symmetrically installed between the distribution beams and stiffening plates and the bridge, with the jacks installed upside down. Conversion caps are also provided between the jacks and the φ609 steel pipe columns.

[0005] Furthermore, by adjusting the position, size, jacking mechanism, and coordination of φ900 and φ609 steel pipe columns and jacks, and by utilizing multiple replacements of jacks, conversion sections, and standard sections, modular adaptive adjustment is achieved, breaking down the bridge support structure into smaller parts and jacking the support structure to its original elevation.

[0006] Furthermore, after the jack is raised 600mm, a φ900 column adapter is installed on the φ900 steel pipe column. After installation, the jack is lowered 100mm to make the φ900 and φ900 column adapter fit together, and then the fastening bolts are installed. After the jack is lowered another 550mm, a φ609 steel pipe adapter is installed below the jack. After the jack is raised 50mm, the φ609 steel pipe column and the φ609 steel pipe adapter coincide, and the fastening bolts are installed.

[0007] Further, after removing the fastening bolts of the φ900 column, the jack is raised another 600mm, the φ900 column adapter is removed, and then the standard φ900 column section is installed. After installation, the jack is lowered 100mm to allow the steel pipe column to fit properly before the fastening bolts are installed.

[0008] Next, remove the fastening bolts of the φ609 steel pipe column, return the jack cylinder 550mm, remove the φ609 steel pipe adapter section, install the φ609 steel pipe standard section, lift the jack 50mm to make the φ609 steel pipe standard section fit, and install the fastening bolts.

[0009] A construction method for a bridge underpass support device with low clearance, comprising the following steps:

[0010] Step 1: Prefabrication of support components

[0011] Steel columns, beams, connecting beams, distribution beams, transition sections, and standard sections are all fabricated in the factory and then transported to the site for installation. The longitudinal beams are fabricated in two sections and then transported to the site for welding and assembly after being placed in place. Meanwhile, the steel columns are fabricated in multiple sections, with flanges made at both ends of each section to facilitate the subsequent installation and disassembly of transition sections and standard sections.

[0012] Step 2: Installation of support components

[0013] The various support components are hoisted using a truck crane and a folding boom crane. The support is lowered 2-3m from the original location mark before the replacement support is installed. First, the φ900 steel pipe columns, crossbeams, longitudinal beams and connecting beams are installed. The longitudinal beams are fixed in place. Then, the φ609 steel pipe columns, conversion caps, jacks and distribution beams are installed. The jacks are installed upside down and their positions are symmetrical and coordinated with the distribution beams.

[0014] Step 3: Install 8 sets of self-locking hydraulic jacks with a stroke of 700mm on each side of the bridge, and automatically control the lifting height through PLC;

[0015] Step 4: Lift the jack 600mm. After lifting it into place, conduct an inspection to ensure the overall system is safe and stable.

[0016] Step 5: Install 6 sets of 500mm high φ900 column transition sections. After installation, return the jack cylinder 100mm to make the steel pipe column fit together, and then install and tighten the bolts. After the jack cylinder returns 550mm, install 8 sets of 500mm high φ609 steel pipe transition sections below the jack. After the jack is raised 50mm, make the φ609 steel pipe overlap, and then install and tighten the bolts.

[0017] Step 6: Remove the fastening bolts of the φ900 column, raise the jack another 600mm, remove 6 sets of 500mm high φ900 column conversion sections, and then install 6 sets of 1000mm high φ900 column standard sections. After installation, return the jack cylinder 100mm to allow the steel pipe column to fit together before installing the fastening bolts.

[0018] Step 7: Remove the fastening bolts of the φ609 steel pipe column, return the jack cylinder 550mm, remove the φ609 steel pipe adapter, install 8 sets of 1000mm high φ609 steel pipe standard sections, lift the jack 50mm to make the φ609 steel pipe standard sections fit together, and install the fastening bolts.

[0019] Step 8: Repeat steps four through seven, and raise the entire support frame by 2 to 3 meters as needed to reach the original elevation. Finally, install the inter-column supports.

[0020] The beneficial effects of this invention are:

[0021] This invention solves the problem of limited clearance under existing bridges, which renders traditional component hoisting methods unusable. By breaking down the bridge support structure into smaller parts, the structure is first lowered 2-3 meters from its original elevation. Then, using jacks, transition sections, and standard sections, the support structure is raised back to its original elevation, meeting the requirements for bridge underpinning construction. Through modular adaptive adjustment, it successfully solves the installation problem of underpinning supports under existing operational bridges, demonstrating significant social value and importance in the field of urban renewal. Attached Figure Description

[0022] Figure 1 Schematic diagram of the support bracket device;

[0023] Figure 2 Plan view of φ900 and φ609 steel columns, distribution beams, and crossbeams;

[0024] Figure 3 Elevation drawings of φ609 steel columns, conversion caps, jacks, distribution beams, and crossbeams;

[0025] Figure 4 Flowchart of bridge underpass replacement support construction under low clearance conditions;

[0026] Figure 5 This is a rendering showing the effect after the completion of the bridge underpass replacement support construction under low clearance conditions. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] like Figure 1 , Figure 2 , Figure 3 , Figure 5As shown, a bridge underpinning support device with low headroom and narrow space includes steel pipe columns, inter-column supports, crossbeams 3, longitudinal beams 4, connecting beams 5, distribution beams 7, stiffening plates 8, jacks 9, transition sections, standard sections, and limiting devices 6, etc.

[0029] On both sides of the piers of the bridge section requiring support, φ900 steel pipe columns 1, supporting crossbeams 3, longitudinal beams 4, and connecting beams 5 are respectively used. The longitudinal beams 4 and crossbeams 3 are fixed by limiting devices 6. Distribution beams 7 and stiffening plates 8 are symmetrically installed below the crossbeams 3. φ609 steel pipe columns 2 and jacks 9 are symmetrically installed between the distribution beams 7 and stiffening plates 8 and the bridge, and the jacks 9 are installed upside down. A conversion cap 10 is installed between the jacks 9 and the φ609 steel pipe columns 2.

[0030] The system includes 8 sets of 100T self-locking hydraulic jacks (700mm stroke), and the lifting height is automatically controlled by a PLC.

[0031] After jack 9 is lifted, install φ900 column transition section 11 between φ900 steel pipe columns 1. After installation, jack 9 returns to its original position, so that φ900 steel pipe column 1 and φ900 column transition section 11 are in contact. Then install and tighten the bolts. After jack 9 continues to return to its original position, install φ609 steel pipe transition section 12 below jack 9. After jack 9 is lifted 50mm, so that φ609 steel pipe column 2 and φ609 steel pipe transition section 12 are aligned. Install and tighten the bolts.

[0032] Remove the fastening bolts of φ900 steel pipe column 1, lift jack 9 up another 600mm, remove φ900 column conversion section 11, and then install φ900 column standard section 13. After installation, return jack 9 to a lower position by 100mm to ensure the steel pipe column fits properly before installing the fastening bolts.

[0033] Remove the fastening bolts of φ609 steel pipe column 2, return jack 9 to a position 550mm, remove φ609 steel pipe adapter section 12, install φ609 steel pipe standard section 14, lift jack 9 50mm to make φ609 steel pipe standard section 14 fit, and then install the fastening bolts.

[0034] like Figure 4 As shown, the implementation steps of a bridge underpass replacement support construction method under low clearance are as follows:

[0035] Step 1: Prefabrication of support components

[0036] Steel columns, beams, connecting beams, distribution beams, transition sections, and standard sections are all fabricated in the factory and then transported to the site for installation. The longitudinal beams have long spans and need to penetrate the piers, so they are fabricated in two sections and transported to the site for welding and assembly after placement. Meanwhile, the steel columns are fabricated in multiple sections, with flanges at both ends of each section to facilitate the subsequent installation and disassembly of transition sections and standard sections.

[0037] Step 2: Installation of support components

[0038] The various support components were lifted using truck cranes and knuckle boom cranes. Because the clearance under the bridge did not meet the conditions for traditional lifting, the replacement supports were, in principle, first lowered 2-3 meters from their original elevation as indicated on the site map before installation. Figure 1 The installation process begins with the first installation of the φ900 steel pipe columns, horizontal beams, longitudinal beams, and connecting beams, with the longitudinal beams being secured and fixed. Next, the φ609 steel pipe columns, conversion caps, jacks, and distribution beams are installed. The jacks must be installed upside down and their positions must be symmetrical and coordinated with the distribution beams (see details for specific parameters). Figure 2 ).

[0039] Step 3: Install 8 sets of 100T self-locking hydraulic jacks (700mm stroke) on both sides of the bridge, and automatically control the lifting height through PLC;

[0040] Step 4: Lift the jack 600mm. After lifting it into place, conduct an inspection to ensure the overall system is safe and stable.

[0041] Step 5: Install 6 sets of 500mm high φ900 column transition sections. After installation, return the jack cylinder 100mm to make the steel pipe column fit together, and then install and tighten the bolts. After the jack cylinder returns 550mm, install 8 sets of 500mm high φ609 steel pipe transition sections below the jack. After the jack is raised 50mm, make the φ609 steel pipe overlap, and then install and tighten the bolts.

[0042] Step 6: Remove the fastening bolts of the φ900 steel pipe column, raise the jack another 600mm, remove 6 sets of 500mm high φ900 column conversion sections, and then install 6 sets of 1000mm high φ900 column standard sections. After installation, return the jack to the cylinder 100mm to make the steel pipe column fit together before installing the fastening bolts.

[0043] Step 7: Remove the fastening bolts of the φ609 steel pipe column, return the jack cylinder 550mm, remove the φ609 steel pipe adapter, install 8 sets of 1000mm high φ609 steel pipe standard sections, lift the jack 50mm to make the φ609 steel pipe standard sections fit together, and install the fastening bolts.

[0044] Step 8: Repeat steps four through seven, and raise the entire support frame by 2 to 3 meters as needed to reach the original elevation. Finally, install the inter-column supports.

[0045] With the completion of the above procedures, the construction of the bridge underpass replacement support project under low clearance is now finished. Figure 5 .

Claims

1. A construction method for a bridge underpass support device under low clearance, the bridge underpass support device under low clearance includes steel pipe columns, inter-column supports, crossbeams, longitudinal beams, connecting beams, distribution beams and stiffening plates, jacks, transition sections, standard sections, and limiting devices. φ900 steel pipe columns support the crossbeams, longitudinal beams, and connecting beams on both sides of the piers of the bridge section to be underpassed. The longitudinal beams and crossbeams are fixed by limiting devices. Distribution beams and stiffening plates are symmetrically arranged below the crossbeams. Jacks and φ609 steel pipe columns are symmetrically installed between the distribution beams and stiffening plates and the bridge, with the jacks installed upside down. A transition cap is provided between the jacks and the φ609 steel pipe columns. The method is characterized in that... The steps of this method are as follows: Step 1: Prefabrication of support components Steel columns, beams, connecting beams, distribution beams, transition sections, and standard sections are all fabricated in the factory and then transported to the site for installation. The longitudinal beams are fabricated in two sections and then transported to the site for welding and assembly after being placed in place. Meanwhile, the steel columns are fabricated in multiple sections, with flanges made at both ends of each section to facilitate the subsequent installation and disassembly of transition sections and standard sections. Step 2: Installation of support components The various support components are hoisted using a truck crane and a folding boom crane. The support is lowered 2-3m from the original height marked on the map before the replacement support is installed. First, the φ900 steel pipe columns, crossbeams, longitudinal beams and connecting beams are installed. The longitudinal beams are fixed in place. Then, the φ609 steel pipe columns, conversion caps, jacks and distribution beams are installed. The jacks are installed upside down and their positions are symmetrical and coordinated with the distribution beams. Step 3: Install 8 sets of self-locking hydraulic jacks with a stroke of 700mm on each side of the bridge, and automatically control the lifting height through PLC; Step 4: Lift the jack 600mm. After lifting it into place, conduct an inspection to ensure the overall system is safe and stable. Step 5: Install 6 sets of 500mm high φ900 column transition sections. After installation, return the jack cylinder 100mm to make the steel pipe column fit together, and then install and tighten the bolts. After the jack cylinder returns 550mm, install 8 sets of 500mm high φ609 steel pipe transition sections below the jack. After the jack is raised 50mm, make the φ609 steel pipe overlap, and then install and tighten the bolts. Step 6: Remove the fastening bolts of the φ900 column, raise the jack another 600mm, remove 6 sets of 500mm high φ900 column conversion sections, and then install 6 sets of 1000mm high φ900 column standard sections. After installation, return the jack to the cylinder 100mm to make the steel pipe column fit together before installing the fastening bolts. Step 7: Remove the fastening bolts of the φ609 steel pipe column, return the jack cylinder 550mm, remove the φ609 steel pipe adapter, install 8 sets of 1000mm high φ609 steel pipe standard sections, lift the jack 50mm to make the φ609 steel pipe standard sections fit together, and install the fastening bolts. Step 8: Repeat steps four through seven, and raise the entire support frame by 2-3m as needed to reach the original elevation. Finally, install the inter-column supports.

2. The construction method of the bridge underpass replacement support device under low clearance according to claim 1, characterized in that: By adjusting the position and dimensions of φ900 and φ609 steel pipe columns and jacks, and by combining the lifting and coordination of jacks with multiple replacements of jacks, conversion sections and standard sections, modular adaptive adjustment is achieved, breaking down the bridge support into parts and lifting the support to its original elevation.

3. The construction method of the bridge underpass replacement support device under low clearance according to claim 1, characterized in that: After the jack is raised 600mm, a φ900 column adapter is installed on the φ900 steel pipe column. After installation, the jack is lowered 100mm to make the φ900 and φ900 column adapter fit together, and then the fastening bolts are installed. After the jack is lowered another 550mm, a φ609 steel pipe adapter is installed below the jack. After the jack is raised 50mm, the φ609 steel pipe column and φ609 steel pipe adapter are aligned, and the fastening bolts are installed.

4. The construction method of the bridge underpass replacement support device under low clearance as described in claim 3, characterized in that: After removing the fastening bolts of the φ900 steel pipe column, the jack is raised another 600mm to remove the φ900 column adapter section. Then, the φ900 column standard section is installed. After installation, the jack is lowered 100mm to allow the steel pipe column to fit properly before installing the fastening bolts.

5. The construction method of the bridge underpass replacement support device under low clearance according to claim 3, characterized in that: Remove the fastening bolts of the φ609 steel pipe column, return the jack cylinder 550mm, remove the φ609 steel pipe adapter section, install the φ609 steel pipe standard section, lift the jack 50mm to make the φ609 steel pipe standard section fit, and install the fastening bolts.

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