CN103898835B - The anti-back of the body of bridge draws load-bearing construction bracket and construction method - Google Patents

Abstract

A bridge anti-back tension load-bearing construction support and construction method, including the abutment foundation, the tie rod column is buried in the abutment foundation through a plurality of steel plate bases, and the load-bearing ear plate is buried on the side wall of the abutment foundation; The braces form a frame structure beam, one end of the frame structure beam is connected with the load-bearing ear plate, and the upper end surface of the frame structure beam is connected with the tie rod column through a plurality of tie rods. The construction method includes the following steps: during the construction of the abutment foundation, bury the steel plate base and the load-bearing lug plate; install the steel load-bearing piece in place; process the tie rod column, and then weld and install it on the steel plate base; install the tie rod; weld the diagonal brace; lay the scaffold and the beam body Bottom formwork, installation of steel bars, vertical formwork and concrete construction; the above can realize beam construction of small-span bridges. The invention solves the load-bearing problem of cast-in-place concrete construction of small-span bridge girders, and at the same time, the structure of the invention is easy to obtain materials, adopts simple equipment, has a fast construction period, and especially can avoid the impact of floods.

Description

The support and construction method of bridge anti-back tension load-bearing construction

technical field

The invention relates to the construction field of cast-in-place girder bodies in bridge construction, in particular to a bridge anti-back pull load-bearing construction support and a construction method.

Background technique

At present, the main methods used in the construction of bridge beams with small spans (usually less than or equal to 32 meters) at home and abroad are:

1. Island-building cast-in-place method: use filling materials to fill in the area where the beam body is installed and tamp it layer by layer to form an island-like platform. Then the formwork base is poured, the steel bars are installed, the formwork is erected, the concrete is poured, the bridge deck is poured, and finally the platform is excavated. The advantage of this construction method is that the method is the simplest, but the disadvantage is that the required construction period is the longest, and sufficient earthwork excavation, loading and transportation equipment must be equipped to ensure the normal development of the work, and there are certain risks in the construction during the flood season.

2. Prefabrication and assembly method: Find a relatively flat location on dry land to build a prefabrication yard, and complete the construction of bridge beams in pieces within the venue. Then use a crane to hoist or use a bridge erecting machine to install the beam body in place. Finally, the construction of the bridge deck is carried out. The advantage of this construction method is that the method is simple, the construction period is fast, and the construction can continue during the flood season. The disadvantage is that a large crane or bridge erecting machine must be equipped.

3. The whole house bending method: use scaffolding and fasteners to build the whole house load-bearing bent frame, then erect the base formwork, install steel bars, formwork, pour concrete, pour the bridge deck, and finally dismantle the full house load-bearing bent frame. The advantage of this construction method is that the method is simple, and the disadvantage is that the construction period is long, and a large amount of steel pipes and fastener materials are required.

4. Cast-in-place method of Bailey frame support. The Bailey frame is used as the load-bearing bent frame, and then the base formwork is erected, the steel bars are installed, the formwork is erected, the concrete is poured, the bridge deck is poured, and the Bailey frame is finally removed. The advantage of this construction method is that it has strong adaptability, can be constructed during flood periods, and has a moderate construction period. The disadvantage is that the technical difficulty is relatively complicated, and it needs to be equipped with professionals, and it is necessary to purchase or lease Bailey racks.

Since the access road cross-river bridge project of a hydropower project is located in a remote mountainous area, it is difficult for equipment and materials to enter the site in the early stage of the project. The area is relatively poor and backward. Many equipment lacks a rental market, and large-scale procurement of materials is quite difficult. It is tense, and there are often sudden floods to harass.

Contents of the invention

The technical problem to be solved by the present invention is to provide a bridge reverse pull load-bearing construction bracket and construction method, which can solve the load-bearing problem of beam body concrete cast-in-place construction, and at the same time, it is easy to obtain materials, simple equipment, fast construction period, and can avoid the impact of floods.

In order to solve the above-mentioned technical problems, the technical solution adopted in the present invention is: a kind of bridge anti-back pull load-bearing construction support, including the abutment foundation, the tie rod column is buried in the abutment foundation through a plurality of steel plate bases, and on the side of the abutment foundation The wall is buried with load-bearing ear plates;

The steel bar load-bearing piece and the diagonal bracing form a frame structure beam, one end of the frame structure beam is connected with the load-bearing ear plate, and the upper end surface of the frame structure beam is connected with the tie rod column through a plurality of tie rods.

A scaffolding is laid on the upper end surface of the frame structure beam, and a beam body bottom form is installed on the scaffolding.

The tie rods are connected to the frame structure beams through flanged screws.

In the frame structure beam, the steel bar load-bearing pieces are located on both sides of the frame structure beam, and the diagonal braces are located on the upper and lower end surfaces of the frame structure beam.

The steel bar load-bearing sheet is welded by a plurality of triangular strip steel bars.

The diagonal brace is an "X" shaped diagonal brace.

A construction method adopting the above-mentioned bridge anti-back pull load-bearing construction support, comprising the following steps:

1. During the construction of the abutment foundation, the steel plate base is buried in the structural concrete of the abutment foundation, and the load-bearing lugs are welded and fixed during the processing of the steel plate base;

2. Pre-process the steel load-bearing sheet in the steel processing plant, and install it in place by hoisting;

3. Process the tie rod column with channel steel or I-beam, and then weld and install it on the steel plate base;

4. Weld or install tie rods, and use flange screws to connect with steel load-bearing pieces in place;

5. Weld the diagonal bracing at a certain distance between the upper and lower end faces of the steel bar load-bearing piece, and connect the steel bar load-bearing piece into a frame structure beam;

6. Lay scaffolding and beam bottom formwork on the upper end of the frame structure beam, and carry out subsequent bridge beam installation of steel bars, vertical formwork and concrete construction;

The beam body construction of the small-span bridge is realized through the above steps.

The present invention provides a bridge anti-back pull load-bearing construction support and construction method, by adopting the structure of anti-back pull cantilever beam, it solves the load-bearing problem of small-span bridge beam body concrete cast-in-place construction, and at the same time, the structure of the present invention is easy to obtain materials, The equipment used is simple, the construction period is fast, and it can especially avoid the impact of floods. It is very suitable for construction in remote areas where equipment and materials are scarce.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

Fig. 1 is a schematic diagram of the overall structure of the present invention.

Fig. 2 is a view along the direction A in Fig. 1 .

In the figure: steel bar load-bearing sheet 1, load-bearing lug plate 2, tie rod column 3, tie rod 4, flange screw 5, abutment foundation 6, steel plate base 7, scaffolding 8, beam bottom formwork 9, and diagonal brace 10.

Detailed ways

Example 1:

As shown in Figures 1 and 2, a bridge back pull load-bearing construction support includes an abutment foundation 6, tie rod columns 3 are buried in the abutment foundation 6 through a plurality of steel plate bases 7, and the side walls of the abutment foundation 6 are buried with Bearing ear plate 2;

The steel bar load-bearing piece 1 and the diagonal brace 10 form a frame structure beam, one end of the frame structure beam is connected with the load-bearing ear plate 2 , and the upper end surface of the frame structure beam is connected with the tie rod column 3 through a plurality of tie rods 4 . With this structure, the concrete cast-in-place construction of the bridge girder body can be carried out on the entire construction support.

Preferably, the steel bar load-bearing sheet 1 is welded by a plurality of triangular strip steel bars. The diagonal brace 10 is an "X" shaped diagonal brace, which is used to overcome the left and right deflection produced by the steel bar load-bearing sheet 1 and connect it as a whole. The steel bars used can make the triangular bar steel bar load-bearing sheet able to bear the weight of the single-piece bridge girder. The pre-embedded steel plate load-bearing lugs on the side of the abutment foundation 6 need to be calculated so that the configured steel plates can withstand the shear stress generated by the corresponding weight.

A scaffolding 8 is laid on the upper end surface of the frame structure beam, and a beam body bottom form 9 is installed on the scaffolding 8 .

The tie rod 4 is connected with the frame structure beam through the flange screw rod 5 . The set flange screw 5 is used to adjust the error caused by the sinking deflection due to gravity.

In the frame structure beam, the steel bar load-bearing pieces 1 are located on both sides of the frame structure beam, and the diagonal braces 10 are located on the upper and lower end surfaces of the frame structure beam.

Example 2:

On the basis of embodiment 1, a kind of construction method that adopts the bridge reverse pull load-bearing construction support described in claim 1～6 may further comprise the steps:

1. During the construction of the abutment foundation 6, the steel plate base 7 is buried in the structural concrete of the abutment foundation 6, and the load-bearing ear plate 2 is welded and fixed with the steel plate base 7 during processing;

2. Pre-process the steel bar load-bearing piece 1 in the steel bar processing plant, and use a small crane or other means, such as a hoist, electric or manual hoist, etc., to hoist and install it in place;

3. Process the tie rod column 3 with channel steel or I-beam, and then weld and install it on the steel plate base; the processing can be pre-processed in the steel bar processing plant, or can be welded and processed on the abutment foundation 6 on-site.

4. Weld or install the tie rod 4, and use the flange screw 5 to connect with the steel load-bearing sheet 1 in place;

5. Weld the diagonal braces 10 at a certain distance between the upper and lower end surfaces of the steel bar load-bearing sheet 1, and connect the steel bar load-bearing sheet 1 into a frame structure beam;

6. Lay scaffolding 8 and beam body bottom form 9 on the upper end surface of the frame structure beam, and carry out subsequent bridge beam body installation of steel bars, vertical formwork and concrete construction;

The beam body construction of the small-span bridge is realized through the above steps. Practice has proved that the invention has the advantages of easy material acquisition, simple equipment, fast construction period, safe construction, and ability to avoid flood impact.

Claims (6)

1. bridge is counter carries on the back a construction method of drawing load-bearing construction bracket, comprises abutment foundation (6), and pull bar column (3) is embedded in abutment foundation (6) by multiple steel plate base (7), is embedded with load-bearing otic placode (2) at the sidewall of abutment foundation (6);

Reinforcing bar load-bearing piece (1) and diagonal brace (10) form frame structural beam, and frame structural beam one end is connected with load-bearing otic placode (2), and the upper surface of frame structural beam is connected with pull bar column (3) by many pull bars (4), it is characterized in that comprising the following steps:

One, when carrying out abutment foundation (6) construction, be embedded in the structural concrete of abutment foundation (6) by steel plate base (7), load-bearing otic placode (2) adds with steel plate base (7) and is welded and fixed man-hour;

Two, the screwing steel bars load-bearing piece (1) in advance in steel bar meter field, adopts lifting installation in position;

Three, with channel-section steel or i iron processing pull rod column (3), then welded and installed is in steel plate base;

Four, welding or installation pull bar (4), and adopt flange screw rod (5) to be connected in place with reinforcing bar load-bearing piece (1);

Five, the upper and lower end face of reinforcing bar load-bearing piece (1) keep at a certain distance away welding diagonal brace (10), reinforcing bar load-bearing piece (1) is connected into frame structural beam;

Six, lay scaffold (8) and beam body bed die (9) in the upper surface of frame structural beam, carry out follow-up bridge beam body and reinforcing bar, formwork erection and concrete construction are installed;

The beam body construction of little span bridge is realized by above-mentioned steps.

2. a kind of bridge according to claim 1 is counter carries on the back the construction method of drawing load-bearing construction bracket, it is characterized in that: the upper surface of described frame structural beam is equipped with scaffold (8), and scaffold (8) is provided with beam body bed die (9).

3. a kind of bridge according to claim 1 is counter carries on the back the construction method of drawing load-bearing construction bracket, it is characterized in that: described pull bar (4) is connected with frame structural beam by flange screw rod (5).

4. a kind of bridge according to claim 1 is counter carries on the back the construction method of drawing load-bearing construction bracket, it is characterized in that: in described frame structural beam, reinforcing bar load-bearing piece (1) is positioned at the two sides of frame structural beam, and diagonal brace (10) is positioned at the upper and lower end face of frame structural beam.

5. a kind of bridge according to claim 4 is counter carries on the back the construction method of drawing load-bearing construction bracket, it is characterized in that: described reinforcing bar load-bearing piece (1) is formed by the leg-of-mutton bar shaped reinforcement welding of multi-disc.

6. a kind of bridge according to claim 4 is counter carries on the back the construction method of drawing load-bearing construction bracket, it is characterized in that: described diagonal brace (10) is " X " shape diagonal brace.