CN110872813A - Precast concrete guardrail connecting structure and assembling method - Google Patents

Abstract

The invention relates to a prefabricated concrete guardrail connection structure and an assembling method. The connection structure comprises a main girder flange plate and a vertical prefabricated concrete guardrail on the lateral outer side thereof; the ends of the main girder flange plate are respectively provided with short steel bars reserved inside the main girder flange plate and a main girder flange. Long steel bars are reserved on the outside of the plate, which extend vertically from the surface of the main girder flange plate; the inner side of the prefabricated concrete guardrail is provided with a pre-embedded steel plate, which is welded and fixed with the short steel bars reserved on the inner side of the main beam flange plate; the outside of the prefabricated concrete guardrail is provided with a vertical guardrail Anchoring holes are reserved, and long steel bars are reserved on the outside of the main girder flange plate and inserted into the guardrail to reserve anchoring holes and fix them by grouting. In the present invention, the welded basic steel bar and the anchor bolt are used for connection, the operation is simple, the connection is convenient and fast, and the connection tolerance is large. And its mechanical performance is good, hoisting, transportation is convenient, durability is good, construction risk is small, and applicability is strong. Since the two ends of the prefabricated segment are provided with stiffening segments, they can be directly connected with dowel rods, and the operation is simple and easy to implement.

Description

Precast concrete guardrail connection structure and assembly method

technical field

The invention relates to the technical field of prefabricated concrete guardrails, in particular to a connection structure and an assembling method of a prefabricated concrete guardrail.

Background technique

Prefabricated guardrails have the incomparable advantages of traditional construction techniques such as factory manufacturing, standardized construction, and rapid installation, which can effectively solve the requirements for traffic, environment, and construction period during construction. The use of prefabricated anti-collision guardrails has the following advantages: ① factory prefabricated, with relatively stable operators and supporting processing equipment, less external interference factors, and significantly improved processing accuracy and appearance quality; ② a large number of high-noise, high-pollution, High-risk "wet operations" are moved to the factory, reducing construction waste by 80%, and greatly reducing the impact of on-site pouring and tamping on surrounding noise and dust; ③ It takes 3 to 5 days for in-situ pouring, and prefabricated assembly construction 1 It can be completed in a day, and most of the work is transferred to the factory, which greatly reduces the risk of operators working at heights on site; ④The prefabricated anti-collision wall can be used for street lamp pipelines, lamp pole embedded parts, railing embedded parts, communication pipelines, electrical boxes. It can be buried in it to improve the quality and accuracy and shorten the construction period.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a connection structure and an assembling method of a prefabricated concrete guardrail, which can reduce the construction risk and speed up the construction efficiency.

The technical scheme adopted in the present invention is:

The connection structure of precast concrete guardrail is characterized by:

The connecting structure includes a main girder flange plate and its laterally outer vertical precast concrete guardrail;

The ends of the main beam flange plates are respectively provided with short steel bars reserved on the inner side of the main beam flange plates and long steel bars reserved on the outside of the main beam flange plates, which extend vertically from the surface of the main beam flange plates;

The inner side of the precast concrete guardrail is provided with a pre-embedded steel plate, which is welded and fixed with the short steel bars reserved on the inner side of the main girder flange plate; the outer side of the precast concrete guardrail is provided with a vertical guardrail reserved for anchoring holes, and the long steel bars reserved on the outer side of the main beam flange plate are inserted into the guardrail. Anchoring holes are left and fixed by grouting.

A steel plate anchoring steel bar is arranged in the precast concrete guardrail, and the embedded steel plate is welded to the steel plate anchoring steel bar and anchored inside the precast concrete guardrail.

A bridge deck is arranged above the flange plate of the main girder, and a longitudinal gap is left between the outer end of the bridge deck and the inner side of the precast concrete guardrail, and the concrete is poured to form a post-pouring zone.

The prefabricated concrete guardrail is prefabricated in longitudinal sections, and each section includes stiffening parts at both ends of the longitudinal direction and a standard part in the middle; the standard part is provided with a longitudinal flower groove; the stiffening part is provided with a weight reduction hole.

The stiffening part of each segment of the precast concrete guardrail is provided with longitudinal openings, and the longitudinal connection between adjacent segments is realized by dowel rods arranged at the opening positions;

The dowel rod is a stainless steel screw, and the end is fixed by a nut.

The outer side of the bottom surface of the precast concrete guardrail is provided with a limiting portion extending downward, and the inner side surface of the limiting portion is close to the outer end face of the flange plate of the main beam.

A mortar cushion is arranged between the bottom surface of the precast concrete guardrail and the surface of the main beam flange plate.

A corrugated pipe is arranged on the inner wall of the anchoring hole reserved for the guardrail.

The assembling method of the connection structure of the precast concrete guardrail is characterized in that:

The method includes the following steps:

Step 1: Precast concrete guardrails in sections, preset vertical guardrails on the outside of the precast concrete guardrail to reserve anchoring holes, and preset pre-embedded steel plates on the inner side;

Step 2: Preset the short steel bars on the inner side of the main girder flange plate and the long steel bars on the outside of the main girder flange plate at the end of the main girder flange plate respectively, and extend vertically from the surface of the main girder flange plate;

Step 3: Hoist the prefabricated concrete guardrail to the end of the main girder flange plate. The short steel bars reserved on the inner side of the main girder flange plate and the embedded steel plate are welded on both sides, and the long steel bars reserved on the outside of the main girder flange plate are inserted into the reserved anchoring holes of the guardrail and poured into the slurry for anchoring. in the guardrail;

Step 4: construct the next segment of precast concrete guardrail, and use dowel rods to connect the segments;

Step 5: There is a longitudinal gap between the outer end of the bridge deck above the main girder flange plate and the inner side of the precast concrete guardrail, and the concrete is poured to form a post-pouring belt.

The present invention has the following advantages:

In the present invention, the welded basic steel bar and the anchor bolt are used for connection, the operation is simple, the connection is convenient and fast, and the connection tolerance is large. And its mechanical performance is good, hoisting, transportation is convenient, durability is good, construction risk is small, and applicability is strong. Since the two ends of the prefabricated segment are provided with stiffening segments, they can be directly connected with dowel rods, and the operation is simple and easy to implement.

Description of drawings

FIG. 1 is a structural diagram of the connection structure of the standard part.

FIG. 2 is a structural diagram of the connection structure of the stiffener.

Figure 3 is a schematic diagram of a partial large sample of A-A.

Figure 4 is an elevation view of the connection structure.

In the figure: 1—main girder flange plate; 2—precast concrete guardrail; 3—post-casting belt; 4—reserved short steel bars on the inner side of the main beam flange plate; 5—reserved long steel bars on the outside of the main beam flange plate; 6—pre-embedded steel plate; 7 - Steel plate anchoring steel bar; 8 - reserved anchoring channel for guardrail; 9 - bridge deck; 10 - dowel rod.

Detailed ways

The present invention will be described in detail below with reference to specific embodiments.

The invention relates to a prefabricated concrete guardrail connection structure. The connection structure includes a main girder flange plate 1 and a vertical prefabricated concrete fence 2 on the lateral outer side thereof; the ends of the main girder flange plate 1 are respectively provided with short steel bars 4 reserved on the inner side of the main girder flange plate. Long steel bars 3 are reserved on the outside of the girder flange plate and the main girder flange plate, which extends vertically from the surface of the main girder flange plate 1; the inner side of the precast concrete guardrail 2 is provided with a pre-embedded steel plate 6, which is welded and fixed with the short steel bars 4 reserved on the inside of the main girder flange plate; precast concrete The outer side of the guardrail 2 is provided with a vertical guardrail reserved anchoring hole 8, the long steel bar 3 reserved on the outer side of the main girder flange plate is inserted into the guardrail reserved anchoring hole 8 and fixed by grouting, and the inner wall of the guardrail reserved anchoring hole 8 is provided with a corrugated pipe.

A steel plate anchoring steel bar 7 is arranged in the precast concrete guardrail 2 , and the embedded steel plate 6 is welded to the steel plate anchoring steel bar 7 and is anchored inside the precast concrete guardrail 2 .

A bridge deck 9 is arranged above the main girder flange plate 1 , and a longitudinal gap is left between the outer end of the bridge deck 9 and the inner side of the precast concrete guardrail 2 , and the post-casting belt 3 is formed by pouring concrete.

The prefabricated concrete guardrail 2 is prefabricated in longitudinal sections, and each section includes stiffening parts at both ends of the longitudinal direction and a standard part in the middle; the standard part is provided with a longitudinal flower groove; the stiffening part is provided with a weight reduction hole. The stiffening part of each segment of the prefabricated concrete guardrail 2 is provided with longitudinal openings, and the longitudinal connection between adjacent segments is realized by dowel bars 10 arranged at the opening positions; the dowel bars 10 are stainless steel screws, and the ends are connected by nuts fixed.

The outer side of the bottom surface of the precast concrete guardrail 2 is provided with a limiting portion extending downward, and the inner side surface of the limiting portion is close to the outer end surface of the main beam flange plate 1 .

A mortar cushion is arranged between the bottom surface of the precast concrete guardrail 2 and the surface of the main beam flange plate 1 .

The assembling method of the above-mentioned precast concrete guardrail connection structure includes the following steps:

Step 1: prefabricating the concrete guardrail 2 in sections, prefabricating a vertical guardrail on the outer side of the prefabricated concrete guardrail 2 to reserve anchoring holes 8, and prefabricating a pre-embedded steel plate 6 on the inner side;

Step 2: Presetting the short steel bars 4 on the inner side of the main beam flange plate 1 and the long steel bars 3 on the outside of the main beam flange plate, respectively, at the end of the main beam flange plate 1, and extending vertically from the surface of the main beam flange plate 1;

Step 3: Hoist the precast concrete guardrail 2 to the end of the main girder flange plate 1, the short steel bars 4 reserved on the inner side of the main girder flange plate and the embedded steel plates 6 are welded on both sides, and the long steel bars 3 reserved on the outside of the main girder flange plate are inserted into the guardrail to reserve anchoring holes 8 and pour slurry to anchor in the guardrail;

Step 4: construct the next segment of precast concrete guardrail 2, and use dowel rods 10 to connect the segments;

Step 5: There is a longitudinal gap between the outer end of the bridge deck 9 above the main girder flange plate 1 and the inner side of the precast concrete guardrail 2, and the post-casting belt 3 is formed by pouring concrete.

As shown, the structure of the present invention includes at least one segment of a precast concrete guardrail and a main beam flange plate. The prefabricated guardrail is welded between the vertical main bars reserved for the bridge deck and the embedded steel plates at the inner bottom of the guardrail; and the method of grouting is used to make the steel bars reserved for the main girder flange plate anchored in the reserved holes of the guardrail to realize the prefabricated guardrail and the bridge deck. The connection between the prefabricated segments is provided with stiffening segments at both ends.

During the prefabrication of the guardrail, the steel plate and the anchoring tunnel shall be pre-buried at the bottom of the guardrail prefabricated block; during the prefabrication of the main girder, the steel bars shall be pre-embedded at the corresponding position of the flange plate of the main girder; during the construction of the bridge deck, a reserve of 20-25 cm shall be reserved near the guardrail. Post-casting belt; Dowel rods are used to connect the prefabricated segments.

The construction process of the present invention is:

1) Guardrail factory prefabricated

When the guardrail is prefabricated, reserve the channel through which the main beam anchoring steel bar passes and the anchoring steel plate welded with the main beam anchoring steel bar;

2) Stacking, hoisting and transportation of prefabricated guardrail components

The prefabricated guardrail members should formulate a corresponding stacking plan according to their rigidity and stress conditions, and the necessary support measures should be considered when they are erected.

3) Hoisting and positioning of prefabricated guardrails

The lifting tools of the prefabricated guardrail can be selected according to the weight of the lifting guardrail, such as a truck crane or a bridge erecting machine; the guardrail should be hoisted steadily and slowly, and bumping is strictly prohibited; The connection measures between the sections are used to position and fix the guardrail to ensure the stability of the guardrail.

4) Field assembly of prefabricated guardrail and main beam

Roughly treat the splicing surface at the bottom of the prefabricated guardrail and the flange plate of the main girder, and after soaking with clean water, lay a 20mm thick TGM60 mortar cushion; perform rust removal treatment on the embedded steel plate of the guardrail and the steel bars reserved for the flange plate of the main girder; The guardrail is hoisted into place, the steel bars reserved on the inner side of the main girder and the steel plates embedded in the guardrail are welded on both sides, the steel bars reserved on the outside of the main girder pass through the reserved metal bellows channel, and high-strength non-shrinkage cement grouting material is poured to anchor in the guardrail; Weld the steel mesh of the bridge deck and the outer side of the embedded steel plate of the guardrail, and then pour the self-compacting micro-expanded concrete to complete the splicing construction of the prefabricated guardrail and the main beam; construct the next section of the prefabricated guardrail in sequence according to the above process, and use M27 stainless steel between the guardrail sections. Screw connection.

The content of the present invention is not limited to those listed in the embodiments, and any equivalent transformations taken by those of ordinary skill in the art to the technical solutions of the present invention by reading the description of the present invention are covered by the claims of the present invention.

Claims (9)

1. The connection structure of the precast concrete guardrail is characterized in that: The connection structure comprises a main girder flange plate (1) and its laterally outer vertical precast concrete guardrail (2); The ends of the main beam flange plate (1) are respectively provided with short steel bars (4) reserved on the inner side of the main beam flange plate and long steel bars (3) reserved on the outside of the main beam flange plate, extending vertically from the surface of the main beam flange plate (1); The inner side of the precast concrete guardrail (2) is provided with a pre-embedded steel plate (6), which is welded and fixed with the reserved short steel bars (4) on the inner side of the main girder flange plate; the outer side of the precast concrete guardrail (2) is provided with a vertical guardrail reserved for anchoring holes (8), long steel bars (3) are reserved on the outside of the flange plate of the main girder and are inserted into the reserved anchoring holes (8) of the guardrail and fixed by grouting. 2. The precast concrete guardrail connection structure according to claim 1, wherein: A steel plate anchoring steel bar (7) is arranged in the precast concrete guardrail (2), and the embedded steel plate (6) is welded to the steel plate anchoring steel bar (7) and is anchored inside the precast concrete guardrail (2). 3. The precast concrete guardrail connection structure according to claim 2, wherein: A bridge deck (9) is arranged above the main girder flange plate (1), a longitudinal gap is left between the outer end of the bridge deck (9) and the inner side of the precast concrete guardrail (2), and the concrete is poured to form a post-pouring belt (3). 4. The precast concrete guardrail connection structure according to claim 3, wherein: The prefabricated concrete guardrail (2) is prefabricated longitudinally in segments, each segment includes stiffening parts at both ends of the longitudinal direction and a standard part in the middle; the standard part is provided with a longitudinal flower groove; the stiffening part is provided with a weight reduction hole. 5. The precast concrete guardrail connection structure according to claim 4, wherein: The stiffening part of each segment of the precast concrete guardrail (2) is provided with longitudinal openings, and the longitudinal connection between adjacent segments is realized by dowel rods (10) arranged at the opening positions; The dowel rod (10) is a stainless steel screw, and the end is fixed by a nut. 6. The precast concrete guardrail connection structure according to claim 5, wherein: A limit portion extending downward is provided on the outer side of the bottom surface of the precast concrete guardrail (2), and the inner side surface of the limit portion abuts against the outer end face of the main beam flange plate (1). 7. The precast concrete guardrail connection structure according to claim 6, wherein: A mortar cushion is arranged between the bottom surface of the precast concrete guardrail (2) and the surface of the main beam flange plate (1). 8. The precast concrete guardrail connection structure according to claim 7, wherein: A corrugated pipe is arranged on the inner wall of the anchoring hole (8) reserved for the guardrail. 9. The assembling method of the connection structure of the precast concrete guardrail is characterized in that: The method includes the following steps: Step 1: prefabricating the concrete guardrail (2) in sections, prefabricating a vertical guardrail on the outer side of the prefabricated concrete guardrail (2) to reserve anchoring holes (8), and prefabricating a pre-embedded steel plate (6) on the inner side; Step 2: Preset the short steel bars (4) on the inner side of the main beam flange plate (4) and the long steel bars (3) on the outside of the main beam flange plate at the end of the main beam flange plate (1) respectively, and extend vertically from the surface of the main beam flange plate (1). ; Step 3: Hoist the precast concrete guardrail (2) to the end of the main girder flange plate (1), reserve short steel bars (4) on the inner side of the main girder flange plate and weld the embedded steel plate (6) on both sides, and reserve a long length on the outside of the main girder flange plate. Reinforcing bars (3) are inserted into the guardrail to reserve anchoring holes (8), and the grout is poured into the guardrail for anchoring; Step 4: construct the next segment of the precast concrete guardrail (2), and connect the segments with dowel rods (10); Step 5: A longitudinal gap is left between the outer end of the bridge deck (9) above the main girder flange plate (1) and the inner side of the precast concrete guardrail (2), and concrete is poured to form a post-pouring belt (3).

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