Construction method of pier body with existing railways on two sides and narrow spaces on two sides

Abstract

The invention discloses a construction method of a pier body with the two sides being provided with existing railways and the two sides being narrow in space. Relates to the technical field of pier body construction, and comprises the following steps: right line construction: arranging a construction platform on a pier body, hoisting a steel die, erecting a whole steel template of an abutment of a pier column below 10m in one step, and pouring a pier column above 10m in batches; a crane is arranged in the middle, and pier body construction is conducted through a set-shaped steel mold; protecting piles and shaping steel molds are arranged on the side of the existing line for construction, and a bearing platform and a pier body template are hoisted by a crane; supporting legs of the crane are welded and limited through channel steel; constructing a left line: constructing a side middle pier foundation and a bearing platform, mounting a swivel spherical hinge device, and constructing a pier upper turntable and a pier body of the main bridge; cantilever construction is carried out on 0-11 # sections, and side span cast-in-place and folding are carried out; rotation is implemented, and the two main piers rotate at the bottoms of the piers; the steel box girder is used as a platform to assemble the steel box girder and a guide beam, and the steel box girder is pushed; and falling the steel box girder. Two construction methods are adopted on the right line and the left line respectively, and construction feasibility and safety are improved.

Description

Technical Field

[0001] The invention relates to the technical field of pier body construction, and more particularly to a pier body construction method with existing railways on both sides and narrow space on both sides. Background Art

[0002] The pier is the main body of the intermediate supporting structure of a multi-span bridge, and its main materials are wood, stone, concrete, reinforced concrete and steel.

[0003] At present, the existing pier body construction method needs to consider the space on both sides of the pier body construction. It is necessary to consider the situation when there are existing railways on both sides of the pier body and the construction space on both sides of the pier body is narrow. At this time, the pier column is a slope pier, and the cross-sectional size of the slope pier changes gradually. Neither the sliding formwork nor the flip formwork construction method is applicable. The construction feasibility and safety of the existing pier body construction method in this case need to be improved.

[0004] Therefore, how to provide a pier body construction method with improved feasibility and safety when there are existing railways on both sides and the space on both sides is narrow is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0005] In view of this, the present invention provides a pier body construction method with existing railways on both sides and narrow space on both sides, aiming to solve one of the problems in the above-mentioned background technology and improve the feasibility and safety of construction.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A pier construction method with existing railways on both sides and narrow space on both sides, comprising:

[0008] Right line construction steps:

[0009] Step 1: Set up steel pipe scaffolding around the pier body as a construction platform, hoist the steel formwork, and use the integral steel formwork to erect the pier platform of the pier column below 10m, and cast the whole at one time. The pier column above 10m is cast in batches;

[0010] Step 2: The crane is set up in the middle of the existing railways on both sides for construction, and the pier body is constructed using a fixed steel mold and hoisted by the crane;

[0011] Step 3: Set up protective piles on the existing line side, use fixed steel formwork for construction, and use crane to hoist the cap and pier formwork;

[0012] Step 4: The crane legs are welded with channel steel to prevent overturning;

[0013] Left line construction steps:

[0014] Step 1: construct the foundation and pedestal of the side and middle piers, install the swivel ball joint device, and construct the turntable and pier body of the main bridge along the railway direction;

[0015] Step 2: Cantilever construction of 0-11# segments, cast-in-place of side spans and closure;

[0016] Step 3: Implement the rotation. The two main piers rotate at the bottom of the piers;

[0017] Step 4: Use the constructed steel box girder as a platform to assemble the steel box girder and guide beam, and push the steel box girder;

[0018] Step 5: Lowering the steel box girder.

[0019] Furthermore, when the pier bridge of the right line is constructed to cross the existing railway, a portal pier and a steel cap beam are used, and the hoisting of the steel cap beam includes the following steps:

[0020] Step 1: Process the steel cap beam in blocks;

[0021] Step 2: On-site assembly of the steel cap beam. The steel cap beam is transported to the site in sections and assembled on the construction site. Before assembly, an assembly jig is set up. During the assembly of the steel cap beam, ropes are installed on both sides for reinforcement. The crawler crane is used for assembly. After the steel cap beam is assembled, the weld is inspected and hoisted;

[0022] Step 3: Prepare the construction site for steel cap beam hoisting → Assemble and accept the steel cap beam → Install, inspect and accept the crane → Test hoisting → Block → Hoist → Temporary lock → Hoisting completed.

[0023] Furthermore, the hoisting work platform is replaced with a filling treatment, and the foundation of the hoisting construction site of the steel cap beam is replaced with soil and crushed stones.

[0024] Furthermore, during the construction of the left line, after the steel box girder is pushed into place, a beam-dropping crane is installed on the top of the steel-concrete joint section at both ends of the constructed steel box girder, and each of the beam-dropping cranes is connected into a whole by two diamond trusses.

[0025] Furthermore, two sets of independent beam-dropping mechanisms are arranged at the front upper cross beam of each diamond truss, and each set of the beam-dropping mechanisms includes a support tube, a through-hole jack and a beam-dropping suspension rod. The support tube is arranged on the front upper cross beam through a lower nut, and the through-hole jack is installed on the support tube through an upper nut. The beam-dropping suspension rod extends downward and passes through the support tube, the through-hole jack and the front upper cross beam in sequence. The bottom of the beam-dropping suspension rod is connected to the suspension rod connecting ear, and the bottom of the suspension rod connecting ear is provided with a steel box beam suspension ear.

[0026] Furthermore, the beam-dropping suspension rod of one of the two groups of independent beam-dropping mechanisms serves as a safety device in a load-bearing state.

[0027] Furthermore, during the left line construction, when the through-hole jack is used to lower the beam, the steel box beam is supported on the safety device, and the upper nut, lower nut and safety stack block are removed layer by layer.

[0028] It can be seen from the above technical solution that, compared with the prior art, the present invention discloses a pier body construction method with existing railways on both sides and narrow space on both sides. By adopting two construction methods on the left line and the right line respectively, the feasibility and safety of the construction are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0030] Figure 1 A schematic diagram of the right line construction process provided by the present invention;

[0031] Figure 2 A schematic diagram of the left line construction process provided by the present invention;

[0032] Figure 3 A schematic diagram of the crane station location across the right pier of Hangrui Line provided by the present invention;

[0033] Figure 4 A schematic diagram of the anti-overturning provided by the present invention;

[0034] Figure 5 A schematic diagram of a hoisting installation provided by the present invention with one side adjacent to an existing line;

[0035] Figure 6 The overall layout diagram of the bridge deck crane beam drop provided by the present invention;

[0036] Figure 7 A schematic diagram of the structure of the beam dropping mechanism provided by the present invention;

[0037] Figure 8 The present invention provides a schematic diagram of the installation of the steel box girder lifting eye and the suspension rod connecting lifting eye.

[0038] Among them: 1 is the pier body; 2 is the crane; 3 is the support leg; 4 is the channel steel; 5 is the steel box girder; 51 is the steel-concrete combined section; 6 is the beam-dropping crane; 7 is the diamond truss; 71 is the front upper crossbeam; 8 is the support tube; 9 is the through-hole jack; 10 is the beam-dropping suspension rod; 11 is the lower nut; 12 is the upper nut; 13 is the connecting lifting ear; 14 is the steel box girder lifting ear. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] See also Figure 1-8 The embodiment of the present invention discloses a pier body construction method with existing railways on both sides and narrow space on both sides, including:

[0041] Right line construction steps:

[0042] Step 1: Set up steel pipe scaffolding around the pier body 1 as a construction platform, hoist the steel formwork, and use the integral steel formwork to erect the pier platform of the pier column below 10m, and cast the whole at one time. The pier column above 10m is cast in batches;

[0043] Step 2: Crane 2 is set at the middle position of the existing railways on both sides for construction, and the pier body 1 is constructed using a fixed steel mold, and is hoisted by crane 2; the support legs 3 are welded to limit the position, and a dedicated person for crane 2 construction is in charge to reduce rotation; hoisting is performed using the telescopic arm of crane 2;

[0044] Step 3: Set up protection piles on the existing line side, use fixed steel formwork for construction, and use crane 2 to hoist the cap and pier body 1 formwork;

[0045] Step 4: The legs 3 of the crane 2 are welded and limited by the channel steel 4 to prevent overturning; when pouring concrete, different lengths of the crane 2 are used as required;

[0046] Left line construction steps:

[0047] Step 1: construct the side and middle pier foundation and cap, install the swivel ball joint device, and construct the upper turntable and pier body 1 of the main bridge along the railway direction;

[0048] Step 2: Cantilever construction of 0-11# segments, cast-in-place of side spans and closure;

[0049] Step 3: Implement the rotation. The two main piers rotate at the bottom of the piers;

[0050] Step 4: Use the already constructed steel box girder 5 as a platform to assemble the steel box girder 5 and the guide beam, and push the steel box girder 5;

[0051] Step 5: steel box girder 5 is dropped;

[0052] By using two construction methods on the left and right lines respectively, the problem of narrow construction space on both sides caused by existing railways is overcome, and the feasibility and safety of construction are improved.

[0053] In this embodiment, when the pier bridge of the right line is constructed to cross the existing railway, a portal pier and a steel cap beam are used, and the hoisting of the steel cap beam includes the following steps:

[0054] Step 1: Process the steel cap beam in blocks;

[0055] Step 2: On-site assembly of the steel cap beam. The steel cap beam is transported to the site in sections and assembled on the construction site. Before assembly, an assembly jig is set up. During the assembly of the steel cap beam, ropes are installed on both sides for reinforcement. The crawler crane is used for assembly. After the steel cap beam is assembled, the weld is inspected and hoisted;

[0056] Step 3: Prepare the construction site for steel girder hoisting → assemble and accept the steel girder → install, inspect and accept crane 2 → test hoist → blockade → hoist → temporarily lock → hoisting completed; Since the steel girder hoisting is a construction project across the railway line, temporary blockade is required. The temporary blockade time can be selected at night to reduce the impact on operations.

[0057] In this embodiment, the hoisting work platform is replaced with backfill, and the foundation of the hoisting construction site of the steel cap beam is replaced with soil and crushed stone; the area of ​​each hoisting platform is not less than 15×16m, and 100cm improved soil + 100cm graded crushed stone can be used to meet the foundation bearing capacity requirements.

[0058] In this embodiment, during the left line construction, after the steel box girder 5 is pushed into place, a beam-dropping crane 6 is installed on the top of the steel-concrete joint sections 51 at both ends of the constructed steel box girder 5. Each beam-dropping crane 6 is connected into a whole by two diamond trusses 7.

[0059] In this embodiment, two sets of independent beam-dropping mechanisms are arranged at the front upper cross beam 71 of each diamond truss 7, and each set of beam-dropping mechanisms includes a support tube 8, a through-hole jack 9 and a beam-dropping suspension rod 10. The support tube 8 is arranged on the front upper cross beam 71 through a lower nut 11, and the through-hole jack 9 is installed on the support tube 8 through an upper nut 12. The beam-dropping suspension rod 10 extends downward and passes through the support tube 8, the through-hole jack 9 and the front upper cross beam 71 in sequence. The bottom of the beam-dropping suspension rod 10 is connected to the suspension rod connecting ear 13, and the bottom of the suspension rod connecting ear 13 is provided with a steel box beam ear 14; ZLD200 through-hole jack 9 is adopted, and the beam-dropping suspension rod 10 adopts a special Φ50mm1080Mpa precision-rolled threaded steel bar.

[0060] In this embodiment, the beam-dropping suspension rod 10 of one of the two independent beam-dropping mechanisms serves as a safety device in a load-bearing state.

[0061] In this embodiment, during the left line construction, when the through jack 9 is used to lower the beam, the steel box beam 5 is supported on the safety device, and the upper nut 12, the lower nut 11 and the safety stacking block are removed layer by layer.

[0062] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0063] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pier construction method with existing railways on both sides and narrow space on both sides, characterized in that: include: Right line construction steps: Step 1: Set up steel pipe scaffolding around the pier body as a construction platform, hoist the steel formwork, and use the integral steel formwork to erect the pier platform of the pier column below 10m, and cast the whole at one time. The pier column above 10m is cast in batches; Step 2: The crane is set up in the middle of the existing railways on both sides for construction, and the pier body is constructed using a fixed steel mold and hoisted by the crane; Step 3: Set up protective piles on the existing line side, use fixed steel formwork for construction, and use crane to hoist the cap and pier formwork; Step 4: The crane legs are welded with channel steel to prevent overturning; Left line construction steps: Step 1: construct the foundation and pedestal of the side and middle piers, install the swivel ball joint device, and construct the turntable and pier body of the main bridge along the railway direction; Step 2: Cantilever construction of 0-11# segments, cast-in-place of side spans and closure; Step 3: Implement the rotation. The two main piers rotate at the bottom of the piers; Step 4: Use the constructed steel box girder as a platform to assemble the steel box girder and guide beam, and push the steel box girder; Step 5: Lowering the steel box girder.

2. The method for constructing a pier body with existing railways on both sides and narrow space on both sides according to claim 1, characterized in that: When the pier bridge of the right line construction crosses the existing railway, a portal pier and a steel cap beam are used. The hoisting of the steel cap beam includes the following steps: Step 1: Process the steel cap beam in blocks; Step 2: On-site assembly of the steel cap beam. The steel cap beam is transported to the site in sections and assembled on the construction site. Before assembly, an assembly jig is set up. During the assembly of the steel cap beam, ropes are installed on both sides for reinforcement. The crawler crane is used for assembly. After the steel cap beam is assembled, the weld is inspected and hoisted; Step 3: Prepare the construction site for steel cap beam hoisting → Assemble and accept the steel cap beam → Install, inspect and accept the crane → Test hoisting → Block → Hoist → Temporary lock → Hoisting completed.

3. The method for constructing a pier body with existing railways on both sides and narrow space on both sides according to claim 2, characterized in that: The hoisting work platform is replaced with backfill, and the foundation of the hoisting construction site of the steel cap beam is replaced with soil and crushed stone.

4. The method for constructing a pier body with existing railways on both sides and narrow space on both sides according to claim 1, characterized in that: During the left line construction, after the steel box girder is pushed into place, a beam-dropping crane is installed on the top of the steel-concrete joint section at both ends of the constructed steel box girder. Each of the beam-dropping cranes is connected into a whole by two diamond trusses.

5. The method for constructing a pier body with existing railways on both sides and narrow space on both sides according to claim 4, characterized in that: Two sets of independent beam-dropping mechanisms are arranged at the front upper cross beam of each diamond truss, and each set of the beam-dropping mechanisms includes a support tube, a through-hole jack and a beam-dropping suspension rod. The support tube is arranged on the front upper cross beam through a lower nut, and the through-hole jack is installed on the support tube through an upper nut. The beam-dropping suspension rod extends downward and passes through the support tube, the through-hole jack and the front upper cross beam in sequence. The bottom of the beam-dropping suspension rod is connected to the suspension rod connecting ear, and the bottom of the suspension rod connecting ear is provided with a steel box beam suspension ear.

6. The method for constructing a pier body with existing railways on both sides and narrow space on both sides according to claim 5, characterized in that: The beam-dropping suspension rod of one of the two groups of independent beam-dropping mechanisms serves as a safety device in a load-bearing state.

7. The method for constructing a pier body with existing railways on both sides and narrow space on both sides according to claim 6, characterized in that: During the left line construction, when the through-hole jack is used to lower the beam, the steel box beam is supported on the safety device, and the upper nut, lower nut and safety stack block are removed layer by layer.

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