CN210066510U - Stride interim bearing structure of girder steel of existing circuit - Google Patents

Abstract

The utility model discloses a temporary support structure of a steel beam spanning an existing line, comprising two sets of support systems and a bearing bracket; the two sets of support systems are symmetrically arranged on both sides of the existing line, and the lower end of the support system is arranged on the ground The bearing bracket spans the existing line and is installed on two support systems; the steel beam to be installed is hoisted on the bearing bracket in sections. A construction method of a steel beam section spanning an existing line. The beneficial effects of the utility model are as follows: the temporary support structure and the steel beam construction method of the utility model can complete the hoisting of the steel beam across the existing line without hindering the normal passage of the existing line. The method of hoisting the crane in blocks makes up for the deficiencies and limitations of the traditional jacking method; and the utility model is also suitable for the situation where the steel beam is overweight and cannot be hoisted as a whole but can only be hoisted in pieces, and the construction The steel beam is located on a circular curve with a relatively large radius and radian line type, etc.

Description

A Temporary Support Structure of Steel Beams Across Existing Lines

technical field

The utility model relates to the technical field of bridge construction, in particular to a temporary support structure of steel beams spanning existing lines.

Background technique

With the rapid development of infrastructure construction and transportation industry in China, more and more road and railway bridges are being built across seas, rivers and on land, and the complex environment and working conditions of various bridge construction have also become a big problem. challenge. Different bridges have different construction methods due to their different construction environments, involving different temporary support and installation techniques. In addition, due to factors such as project schedule, construction speed, safety and economy, during the construction and installation of bridges, how to select temporary supports and construction methods under the conditions of meeting technical and economic requirements is the key. It is also a key technical problem that continues to be solved.

At present, the more mature steel beam erection schemes in China mainly include: the scaffolding method, the floating hanger method and the jacking frame method. Or assemble prefabricated segments; while the floating hanger method is mainly used for water construction; the jacking frame method means that when the structure is to pass under the embankment of the existing line, in order not to disturb the existing line, the structure can be placed on the side of the embankment. It is built in sections and then pushed with a jack to make it pass through the embankment.

The traditional construction of steel beams spanning existing lines is generally constructed by using jacking frames. During jacking construction, it does not affect the traffic under the bridge, does not require large lifting equipment, and does not require high-altitude operations. It is especially suitable for urban bridges with extra-large spans. Construction of long-term approach bridges or three-dimensional crossings; since the beam sections are constructed periodically on a fixed site, the construction quality and construction progress can be easily guaranteed. However, the jacking construction method has the following obvious defects: there are many restrictions on the geometric shape of the bridge structure. The constant change of the force will increase the beam height and the amount of materials, especially the amount of prestressed steel bars. Due to the limitation of the bending moment of the jacking cantilever, it is uneconomical for the jacking span to exceed 70-80 meters; the repeated stress during the jacking process , so that the beam height is large, there are many temporary beams, and the tensioning process is cumbersome; in addition, the jacking construction can only have two working faces at most, which also limits the speed of the jacking construction.

SUMMARY OF THE INVENTION

The purpose of the utility model is to provide a temporary support structure for installing a steel beam across an existing line in view of the deficiencies of the prior art.

The technical scheme adopted by the utility model is as follows: a temporary support structure of steel beams spanning an existing line, comprising two sets of support systems and a bearing bracket; the two sets of support systems are symmetrically arranged on both sides of the existing line, The lower end is set on the ground; the bearing bracket spans the existing line and is installed on two support systems; the steel beam to be installed is hoisted on the bearing bracket in sections.

According to the above solution, the support bracket is formed by a plurality of horizontal beams arranged at equal intervals and a plurality of longitudinal beams arranged at equal intervals in the longitudinal direction to form a stable frame structure.

According to the above solution, the longitudinal beam includes a longitudinal beam main body, a longitudinal beam panel and a longitudinal beam web, the longitudinal beam panel is fixed to the upper surface and the lower surface of the longitudinal beam main body, and the longitudinal beam web is fixed to the two sides of the longitudinal beam main body. an outer side.

According to the above scheme, the longitudinal beam main body includes a plurality of longitudinal beam partitions arranged at intervals along the longitudinal direction of the longitudinal beam, and a plurality of longitudinal beam reinforcement ribs; the longitudinal beam partitions are frame-shaped structures, and the longitudinal beam partitions are provided with The number and position of the longitudinal beam reinforcement ribs are matched with the installation holes; the longitudinal beam reinforcement ribs pass through the installation holes at the corresponding positions of all the longitudinal beam partition plates in turn, and the longitudinal beam partition plates and the longitudinal beam reinforcement ribs together form the longitudinal beam main structure.

According to the above scheme, each support system includes a plurality of outrigger structures installed at intervals along the length of the existing line, each outrigger structure includes a pre-embedded base, a number of vertical rods and a lap joint structure, and the lower ends of all the vertical rods are connected to the The pre-embedded bases are fixedly connected, and the upper ends of all vertical poles are connected with the lap joint structure.

According to the above scheme, a number of vertical rod cross braces are installed at intervals along the axis direction between two adjacent vertical rods; the two sides of the bearing bracket are respectively fixed on the overlapping structure.

According to the above scheme, the lap joint structure includes two parallel short rods, and a support cross brace fixed on the upper part of the two connecting rods; A plurality of vertical stiffening plates are arranged on both sides of the cross support of the seat; the bearing bracket is fixed on the cross support of the support.

According to the above scheme, a horizontal backing plate is installed on the upper end of the vertical rod, and the outer edge of the backing plate extends radially outward; a plurality of triangular ribs arranged at intervals in the circumferential direction are arranged between the extended section of the backing plate and the outer wall of the vertical rod plate.

The beneficial effects of the present invention are as follows: the temporary support structure of the present invention can complete the hoisting of the steel beam across the existing line without hindering the normal passage of the existing line. It makes up for the shortcomings and limitations of the traditional jacking method; and the invention is also applicable to the situation where the steel beam is overweight and cannot be hoisted as a whole but can only be hoisted in pieces, and the steel beam to be constructed is located on the radius and radian lines. The overall performance of the temporary support structure in the present invention is high, the stability is strong, safe and reliable, and the erection and disassembly are convenient and rapid, and the construction speed is fast; the temporary support structure adopts steel pipe columns, channel steel, It is made of materials with high versatility such as I-beam and self-made simple beams, and the cost is low, and the disassembled materials can be reused.

Description of drawings

FIG. 1 is a schematic diagram of the positions of a temporary support structure and an existing line in a specific embodiment of the present invention.

FIG. 2 is an overall schematic diagram of the temporary support structure.

FIG. 3 is a schematic diagram of the structure of the legs in this embodiment.

FIG. 4 is a schematic diagram of the connection between the leg structure and the overlapping structure in this embodiment.

FIG. 5 is a schematic structural diagram of a vertical pole cross brace in this embodiment.

FIG. 6 is a schematic structural diagram of a vertical rod in this embodiment.

FIG. 7 is a schematic diagram of the positions of existing lines and steel beams to be constructed in this embodiment.

FIG. 8 is a schematic diagram of a section of a steel beam between two pier columns in this embodiment.

FIG. 9 is a block schematic diagram of the steel beam section A in this embodiment.

FIG. 10 is a schematic diagram 1 (left area) of the position of the crane when each piece of the steel beam block A is hoisted in this embodiment.

FIG. 11 is a schematic diagram 2 (right area) of the position of the crane when each piece of the steel beam block A is hoisted in this embodiment.

FIG. 12 is a schematic diagram of the position of the crane when the steel beam section A is hoisted in this embodiment.

FIG. 13 is a schematic diagram of the position when the steel beam section B is hoisted by a crane in this embodiment.

FIG. 14 is a schematic diagram of the position of the crane when the steel beam section C and the steel beam section D are hoisted in this embodiment.

FIG. 15 is a schematic diagram of the position of the crane when the steel beam section E and the steel beam section F are hoisted in this embodiment.

Among them: 1. Existing line; 2. Temporary support structure; 3. Support system; 4. Beam; 5. Longitudinal beam; 10. Vertical rod cross brace; 11. Pre-embedded base; 12. Vertical stiffening plate; 13. Triangular rib plate; 14. Connecting rod; 15. End connecting plate; plate; 18, longitudinal beam connecting plate; 19, longitudinal beam web; 20, longitudinal beam panel; 21, pier column; 22, support structure; 23, crane; 24, completed steel beam.

Detailed ways

In order to better understand the present utility model, the present utility model will be further described below with reference to the accompanying drawings and specific embodiments.

As shown in Figures 1 and 2, a temporary support structure of steel beams across an existing line includes two sets of support systems and bearing brackets; the two sets of support systems are symmetrically arranged on both sides of the existing line, and the The lower end is set on the ground; the bearing bracket spans the existing line and is installed on two support systems; the steel beam to be installed is hoisted on the bearing bracket in sections.

Preferably, the support bracket is formed by a plurality of transverse beams arranged at equal intervals and a plurality of longitudinal beams arranged at equal intervals in the longitudinal direction to form a stable frame structure. As shown in FIG. 6 , the longitudinal beam includes a longitudinal beam main body, a longitudinal beam panel and a longitudinal beam web, the longitudinal beam panel is fixed to the upper surface and the lower surface of the longitudinal beam main body, and the longitudinal beam web is fixed to the longitudinal beam main body the two outer sides of the longitudinal beam; the longitudinal beam main body includes a number of longitudinal beam partitions spaced along the longitudinal direction of the longitudinal beam, and a plurality of longitudinal beam reinforcement ribs; The installation holes matching the number and position of the longitudinal beam reinforcement ribs are opened; the longitudinal beam reinforcement ribs pass through the installation holes at the corresponding positions of all the longitudinal beam partition plates in turn, and the longitudinal beam partition plates and the longitudinal beam reinforcement ribs together form the longitudinal beam main structure.

Preferably, each support system includes a plurality of outrigger structures installed at intervals along the length of the existing line. As shown in FIG. 4 , each outrigger structure includes a pre-embedded base, a number of vertical rods and a lap joint structure. The lower ends of the rods are fixedly connected to the pre-embedded bases, and the upper ends of all the vertical rods are connected to the lap joint structure; a number of vertical rod cross braces are installed at intervals along the axis direction between two adjacent vertical rods; respectively fixed on the overlapping structure.

Preferably, a horizontal backing plate is installed on the upper end of the upright rod, and the outer portion of the backing plate extends radially outward; a plurality of triangular rib plates spaced in the circumferential direction are arranged between the extending section of the backing plate and the outer wall of the upright rod . As shown in FIG. 5 , the overlapping structure includes two parallel short rods and a support cross brace fixed on the upper part of the two connecting rods; the connecting rods are fixed on the backing plate connected to the upper ends of the vertical rods in the same row/column , a plurality of vertical stiffening plates are arranged on both sides of the horizontal support of the support; the support bracket is fixed on the horizontal support of the support.

In this embodiment, there are three transverse beams and three longitudinal beams, wherein the longitudinal beams are arranged at intervals along the width direction of the existing line, and the transverse beams are arranged at intervals along the length direction of the existing line. When the existing line is wide, the required longitudinal beams are longer, and the two longitudinal beams can be bolted into one body by connecting plates. The beam is H-beam. Each support system includes three outrigger structures that are installed at intervals along the length of the existing line, the pre-embedded base of each outrigger structure is provided with four vertical rods arranged in two rows and two columns, and the upper ends of the vertical rods are fixed with overlapping structures; Three sets of vertical pole cross braces are arranged between the two vertical poles along the axis direction of the vertical pole. The vertical rod is made of spiral steel pipe; the connecting rod is channel steel, and the short rod is I-beam. The vertical rod cross brace includes a connecting rod and end connecting plates at both ends of the connecting rod, and the connecting rod is connected with the outer wall of the vertical rod through the end connecting plates.

During the construction of steel beams, the steel beams between the two pier columns can usually be hoisted in sections and blocks when the length is long. When the steel beam section is located in the barrier-free area, the conventional method can be used for construction; when the steel beam section is located above the existing line, the construction method described below is used. In the present invention, the two piers are arranged on both sides of the existing line.

A construction method for a steel beam section spanning an existing line, comprising the following steps:

Step 1. Set up a support structure between the two piers and columns: After the steel beams on the outer sides of the two steel beams and piers are hoisted, the auxiliary support structure is erected in the non-existing line area according to the conventional method, and the auxiliary support structure is erected in the existing line area. As mentioned above, the temporary support structure requires that the temporary support structure not hinder the normal use of the existing line, but also meet the construction requirements of the steel beam section to be constructed above the existing line;

Step 2. Move the crane to one side of the existing line; at the same time, the boom of the crane is erected, and the radius of gyration of the crane is reviewed;

Step 3: Prefabricate the steel beams between the two piers in sections and transport them to the construction area: In this embodiment, several steel beam sections need to be constructed above the existing line. The steel beam section is divided into multiple prefabricated pieces along the width direction of the steel beam, and then transported to the construction site;

Step 4. Install the spreader on the steel beam block and try to lift it, and adjust the best lifting position of the crane;

Step 5. Hoist each piece of the steel beam section to the temporary support structure and the support structure in turn and fix the positioning initially. The position of the crane is adjusted in real time according to the steel beam section to be hoisted: along the length of the steel beam, each steel beam section is first in the middle and then in the middle. The two sides are hoisted in sequence; along the width direction of the steel beam, the middle section of the same steel beam section, one side of the crane is hoisted first, and the same area is hoisted in turn according to the principle of the middle first and then the two sides;

Step 6. After all the steel beam sections are hoisted and the positions are checked correctly, they are welded and fixed, and the two outermost steel beam sections are welded and fixed with the completed steel beam;

Step 7. Remove the hoisting rigging and withdraw the boom, and move the crane to the construction site of the next steel beam section;

Step 8. Remove the temporary support structure and the support structure.

The construction method of the present invention is applicable to steel beams with different curvatures.

Example: As shown in Figure 7, for the installation and erection of the elevated bridge of the ring-line interchange hub, the steel beam sections required to be installed are all located on a circular curve with a relatively large radius and radian, and the top and bottom of the steel box girder have two-way transverse slopes. The facade has a large longitudinal slope and is on a convex vertical curve with a large radius. The steel frame bridge spans over the existing line; as shown in Figure 8, there are piers on both sides of the existing line for supporting steel beams, and a traditional method is used to erect a bracket system for auxiliary support; one of the two sets of piers The steel beam in the middle is divided into 6 axisymmetrically arranged steel beam sections, which are represented by A, B, C, D, E, and F respectively. The middle steel beam section A and the steel beam section B are located above the existing line. The temporary support structure supports; the steel beam section C and the steel beam section D are arranged between the temporary support structure and the bracket system, and are jointly supported by the temporary support structure and the bracket system; the steel beam section E and the steel beam section F It is located between the support system and the pier column, and is supported by the support system and the pier column. The steel beams with larger width are prefabricated in pieces. Taking steel beam A as an example, steel beam A is divided into seven pieces A1, A2, A3, A4, A5, A6, and A7 along the width of the steel beam. The steel beam blocks in a partition are hoisted according to the principle of the middle first and then the two sides. If there is a gas pipeline in the construction area, it shall be constructed according to the requirements. The specific construction method of the steel beam between the two groups of piers and its spanning the existing line includes the following steps:

Step 1. Set up a support structure between two piers and check the stability of the temporary support structure: After the steel beams on the outer sides of the two steel beams and the piers are hoisted, set up auxiliary structures in the non-existing line area according to the conventional method. For the support structure, the above temporary support structure is erected in the existing line area, and the temporary support structure is required not to hinder the normal use of the existing line, but also to meet the construction requirements of the steel beam section to be constructed above the existing line;

Step 2. Move the crane to one side of the existing line; at the same time, the boom of the crane is erected, and the radius of gyration of the crane is reviewed;

Step 3. The steel beam between the two piers is divided into six sections A, B, C, D, E, and F along the bridge direction. As shown in Figure 8, each steel beam section is divided into seven pieces along the transverse beam direction, such as steel Beam section A is divided into seven blocks A1, A2, A3, A4, A5, A6, and A7 along the transverse bridge direction, as shown in Figure 9, which are prefabricated in blocks and transported to the construction area:

Step 4. Install the spreader on the steel beam block and try to lift it, and adjust the best lifting position of the crane;

Step 5. Hoist each piece of the steel beam section to the temporary support structure and the support structure in turn and fix the positioning initially. The position of the crane is adjusted in real time according to the steel beam section to be hoisted: along the length of the steel beam, each steel beam section is first in the middle and then in the middle. The two sides are hoisted in sequence; along the width direction of the steel beam, hoist in sequence according to the principle of the middle first and the two sides. A5, A6, and A7 are in the same area. First, use the crane to hoist the steel beam blocks A3, A2, A1, A4, A5, A6, and A7 in turn to complete the hoisting and preliminary fixing of the steel beam section A, and hoist the steel beam blocks A3, A2, and A1. The position of the crane is shown in Figure 10, and the position of the crane when the steel beam blocks A4, A5, A6, and A7 are hoisted is shown in Figure 11; Figure 12-15 shows the schematic diagram of the position of the crane when each steel beam section is hoisted;

Step 6. After all the steel beam sections are hoisted and the positions are checked correctly, they are welded and fixed, and the two outermost steel beam sections are welded and fixed with the completed steel beam;

Step 7. Remove the hoisting rigging and withdraw the boom, and move the crane to the construction site of the next steel beam section;

Step 8. Remove the temporary support structure and the support structure.

Finally, it should be noted that the above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art can still understand the above The technical solutions recorded in each embodiment are modified, or some technical features thereof are equivalently replaced, but any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the present invention. within the scope of protection.

Claims (8)

1. A temporary support structure for a steel beam spanning an existing line is characterized by comprising two groups of support systems and a bearing bracket; the two groups of supporting systems are symmetrically arranged on two sides of the existing line, and the lower ends of the supporting systems are arranged on the ground; the support bracket spans the existing line and is arranged on the two support systems; the steel beam to be installed is hoisted on the bearing bracket in sections.

2. A temporary support structure for steel beams spanning an existing line according to claim 1, wherein the support brackets are formed by a plurality of transverse beams arranged at equal intervals and a plurality of longitudinal beams arranged at equal intervals and connected with each other to form a stable frame structure.

3. A steel beam temporary support structure spanning an existing line according to claim 2, wherein the stringer includes a stringer body, stringer panels fixed to upper and lower surfaces of the stringer body, and stringer webs fixed to both outer sides of the stringer body.

4. A steel beam temporary support structure spanning an existing line according to claim 3, wherein said stringer body includes a plurality of stringer bulkheads spaced along a length of the stringer, and a plurality of stringer reinforcing ribs; the longitudinal beam partition plate is of a frame structure, and mounting holes matched with the number of the longitudinal beam reinforcing ribs are formed in the longitudinal beam partition plate at intervals along the axis; the longitudinal beam reinforcing ribs sequentially penetrate through the mounting holes in the corresponding positions of all the longitudinal beam partition plates, and the longitudinal beam partition plates and the longitudinal beam reinforcing ribs jointly form a longitudinal beam main body structure.

5. The temporary steel beam supporting structure spanning the existing line according to claim 1, wherein each supporting system comprises a plurality of supporting leg structures installed at intervals along the length direction of the existing line, each supporting leg structure comprises a pre-embedded base, a plurality of vertical rods and an overlapping structure, the lower ends of all the vertical rods are fixedly connected with the pre-embedded base, and the upper ends of all the vertical rods are connected with the overlapping structure.

6. The temporary support structure for the steel beam across the existing line according to claim 5, wherein a plurality of vertical rod wales are installed between two adjacent vertical rods at intervals along the axial direction; the two sides of the support bracket are respectively fixed on the lapping structure.

7. A steel beam temporary support structure across an existing line according to claim 5, wherein the lap joint structure includes two parallel short bars, and a support wale fixed to upper portions of the two connection bars; the connecting rods are fixed on a base plate connected with the upper ends of the same-row/same-row upright rods, and a plurality of vertical stiffening plates are arranged on two sides of the support cross brace; the support bracket is fixed on the support cross brace.

8. A steel beam temporary support structure for steel girders over existing lines as claimed in claim 5, wherein a horizontal pad is installed at the upper end of the vertical pole, and the outer edge of the pad extends radially outward; a plurality of triangular rib plates which are arranged at intervals along the circumferential direction are arranged between the extension section of the base plate and the outer wall of the upright rod.

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