CN108342984A - A kind of beach soft foundation trestle and its installation sedimentation method - Google Patents

Abstract

The invention discloses a kind of beach soft foundation trestle and its installation sedimentation methods, it is related to field of bridge construction, the device includes the more steel-pipe piles being inserted in ground, the steel-pipe pile top surface is disposed with distribution beam, Bailey beam and floorings from lower to upper, the steel-pipe pile is equipped with back-pressure bearing support in the both sides of direction across bridge, and the back-pressure bearing support is equipped with the jack that top surface is held in the distribution beam bottom surface.The present invention can realize the settlement treatment to steel-pipe pile.

Description

A tidal flat weak foundation trestle bridge and its installation and settlement method

technical field

The invention relates to the field of bridge construction, in particular to a tidal flat weak foundation trestle and a method for installing and settling the tidal flat weak foundation trestle.

Background technique

In the construction of large-scale bridge projects, it is often necessary to build temporary trestles. At the same time, after the trestles are built, the steel pipe piles of the trestles need to be settled. In the construction of the trestle bridge with weak tidal flat foundation, due to the influence of the soft tidal flat terrain, the settlement of the trestle steel pipe pile under the foundation is usually re-inserted with a pile driver, and concrete is poured on the steel pipe pile to increase the steel pipe pile settlement. Although the bearing capacity of the pipe piles can effectively prevent the settlement of the steel pipe piles, it will increase the construction cost of the trestle bridge, and it will be difficult to dismantle the trestle bridge later.

Contents of the invention

In view of the defects existing in the prior art, the object of the present invention is to provide a tidal flat weak foundation trestle, which can realize the settlement treatment of steel pipe piles.

In order to achieve the above object, the technical solution adopted by the present invention is: comprising a plurality of steel pipe piles inserted in the foundation, and the top surface of the steel pipe piles is provided with distribution beams, Bailey beams and bridge decks sequentially from bottom to top, so The steel pipe piles are provided with anti-pressure supporting frames on both sides in the direction of the transverse bridge, and the anti-pressure supporting frames are provided with a jack whose top surface is against the bottom surface of the distribution beam.

On the basis of the above technical solution, each steel pipe pile is provided with two back pressure support frames, and the two back pressure support frames are arranged symmetrically along the axial center line of the steel pipe pile.

On the basis of the above technical solution, the anti-pressure support frame includes a cross bar and an oblique bar, one end of the oblique bar is connected to the end of the cross bar away from the steel pipe pile, and the other end is connected to the steel pipe pile, and the jack is located at on the crossbar.

On the basis of the above technical solution, railings are provided on both sides of the bridge deck.

On the basis of the above technical solution, the top surface of the steel pipe pile is provided with a steel pipe pile cap.

The present invention also provides a method for installation and settlement of trestle bridges with weak foundations in tidal flats, including:

Lofting and positioning of steel pipe piles;

Insert and drive steel pipe piles, and install distribution beams, Bailey beams and bridge decks on the steel pipe piles, and install anti-pressure support frames and jacks on the sides of the steel pipe piles;

Place the load on the bridge deck for weighting to sink the steel pipe piles to the preset depth, and at the same time jack up the distribution beam to raise the bridge deck to the preset height;

A backing plate is placed between the top face of the steel pipe pile and the distribution beam.

On the basis of the above-mentioned technical scheme, the load weight is sequentially increased on the bridge deck to perform graded ballasting on the bridge deck, and the total ballast weight is 1.25 times the bridge deck lane load.

On the basis of the above technical solution, a steel pipe pile cap is provided on the top surface of the steel pipe pile, and the backing plate is placed on the steel pipe pile cap.

On the basis of the above technical solution, the back pressure support frame is welded on the side of the steel pipe pile.

Compared with the prior art, the present invention has the advantages of: placing loads on the bridge deck to pressurize the trestle bridge so that the steel pipe piles can sink to a stable position, realizing the settlement treatment of the steel pipe piles, and the jack can lift and distribute Beams can effectively ensure that the bearing capacity of steel pipe piles after settlement meets the design requirements, and ensure that the bridge deck is at the design height. The entire settlement process is simple and safe to operate, which speeds up the construction progress, and the trestle bridge is also easier to dismantle for reuse in the later stage. Save construction costs and meet green construction requirements.

Description of drawings

Fig. 1 is the structural representation of a trestle bridge with weak ground in tidal flats of the present invention;

Figure 2 is a schematic diagram of installing distribution beams, Bailey beams and bridge decks on steel pipe piles;

Fig. 3 is a schematic diagram of installing a back pressure support frame and a jack on the side of a steel pipe pile;

Figure 4 is a schematic diagram of placing loads on the bridge deck for ballasting.

In the figure: 1-steel pipe pile, 2-distribution beam, 3-Bayley beam, 4-bridge deck, 5-back pressure support frame, 6-jack, 7-horizontal bar, 8-slanting bar, 9-railing, 10-steel pipe pile cap, 11-load.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings.

Referring to Fig. 1, the present invention provides a tidal flat weak foundation trestle, which is installed on the tidal flat weak foundation, and the tidal flat soft foundation soil is relatively soft. Specifically, the tidal flat weak foundation trestle includes a plurality of steel pipe piles 1 inserted in the foundation, The top surface of steel pipe pile 1 is provided with distribution beam 2, Bailey beam 3 and bridge deck 4 in sequence from bottom to top. A jack 6 whose top surface bears against the bottom surface of the distribution beam 2 is arranged on the upper surface, and the jack 6 is used to lift the distribution beam 2 to place a backing plate between the top surface of the steel pipe pile 1 and the distribution beam 2 .

Each steel pipe pile 1 is provided with two back pressure support frames 5 , and the two back pressure support frames 5 are arranged symmetrically along the axial center line of the steel pipe pile 1 . The back pressure support frame 5 includes a cross bar 7 and an oblique bar 8. One end of the oblique bar 8 is connected to one end of the cross bar 7 away from the steel pipe pile 1, and the other end is connected to the steel pipe pile 1. The jack 6 is located on the cross bar 7, and the oblique bar 8 , the cross bar 7 and the steel pipe pile 1 form a stable right-angled triangle structure, so as to better support the jack 6 . Both sides of the bridge deck 4 are provided with railings 9 , and the top surface of the steel pipe pile 1 is provided with a steel pipe pile cap 10 .

The tidal flat weak foundation trestle of the present invention has a simple overall structure, is convenient to install and disassemble, and is reusable, improves the construction speed of the trestle and can effectively reduce the construction cost of the trestle.

The present invention also provides a method for installation and settlement of the tidal flat weak foundation trestle for installation and settlement of the above-mentioned trestle, including:

S1: stakeout and position steel pipe pile 1;

S2: Insert steel pipe pile 1, that is, insert and drive steel pipe pile 1 at the design position of steel pipe pile 1, and install distribution beam 2, Bailey beam 3 and bridge deck 4 on steel pipe pile 1, see Figure 2 As shown, the steel pipe pile 1 is equipped with a back pressure support frame 5 and a jack 6 on the side, as shown in FIG. 3 .

S3: As shown in Figure 4, the load 11 is placed on the bridge deck 4 to carry out ballasting so that the steel pipe pile 1 sinks to a preset depth, and at the same time, the jack 6 lifts the distribution beam 2 to raise the bridge deck 4 to a preset height, ensuring Deck height. The present invention adopts the method of first installing trestle components. When the load is 11, the steel pipe pile 1 sinks, and the height of the bridge deck 4 will also drop. Therefore, jacks 6 are used to lift the bridge deck 4, so that the height of the bridge deck 4 is equal to the design height. At this time, there will be a certain distance between the distribution beam 2 and the steel pipe pile 1. The lifting of the distribution beam 2 by the load 11 and the weight of the jack 6 are carried out synchronously.

S4: Place a backing plate between the top surface of the steel pipe pile 1 and the distribution beam 2, so that the distribution beam 2 is mounted on the steel pipe pile 1, or connect the steel pipe pile 1 so that the steel pipe pile 1 supports the distribution beam 2 .

On the bridge deck 4, increase the weight of the load 11 in turn to carry out the classification and weighting of the bridge deck 4, that is, adopt the mode of gradually increasing the weight of the load 11 to carry out the weighting of the bridge deck 4, respectively 10%, 30%, 50%, 70% and 100%, and the total ballast weight is 1.25 times the load of the bridge deck 4 lanes11.

A steel pipe pile cap 10 is provided on the top surface of the steel pipe pile 1 , and a backing plate is placed on the steel pipe pile cap 10 . The back pressure supporting frame 5 is welded on the side of the steel pipe pile 1 .

The installation and settlement method of tidal flat weak ground trestle bridge of the present invention, back pressure supporting frame 5 is set on the side of steel pipe pile 1, and jack 6 is installed on the back pressure supporting frame 5, and the mode of placing load 11 on bridge deck 4 is opposite to trestle bridge The steel pipe pile 1 sinks to a stable position to realize the settlement treatment of the steel pipe pile 1, and the distribution beam 2 is lifted by the jack 6 to effectively ensure that the bearing capacity of the steel pipe pile 1 after settlement meets the design requirements, and Ensure that the bridge deck 4 is at the design height, the whole settlement process is easy and safe to operate, and the construction progress is accelerated, and the later trestle is also easier to dismantle for reuse, saving construction costs and meeting the requirements of green construction.

The present invention is not limited to the above-mentioned embodiments. For those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications are also considered protection of the present invention. within range. The content not described in detail in this specification belongs to the prior art known to those skilled in the art.

Claims (9)

1. A tidal flat weak foundation trestle, installed on the tidal flat weak foundation, is characterized in that: it comprises a plurality of steel pipe piles (1) inserted in the foundation, and the top surface of the steel pipe piles (1) is sequentially arranged from bottom to top Distributing beams (2), Bailey beams (3) and bridge decks (4) are provided, and the steel pipe piles (1) are provided with back pressure supporting frames (5) on both sides in the transverse bridge direction, and the back pressure The support frame (5) is provided with a jack (6) whose top surface is against the bottom surface of the distribution beam (2). 2. A tidal flat weak foundation trestle bridge as claimed in claim 1 is characterized in that: each steel pipe pile (1) is provided with 2 back pressure support frames (5), and 2 back pressure support frames ( 5) symmetrically arranged along the axial center line of the steel pipe pile (1). 3. A tidal flat weak foundation trestle bridge as claimed in claim 1, characterized in that: the counter pressure support frame (5) comprises a cross bar (7) and a slanting bar (8), and the slanting bar (8) One end is connected to the end of the cross bar (7) away from the steel pipe pile (1), the other end is connected to the steel pipe pile (1), and the jack (6) is located on the cross bar (7). 4. The tidal flat weak foundation trestle bridge according to claim 1, characterized in that: railings (9) are provided on both sides of the bridge deck (4). 5. A tidal flat weak foundation trestle bridge according to claim 1, characterized in that: the top surface of the steel pipe pile (1) is provided with a steel pipe pile cap (10). 6. A method for installation and settlement of trestle bridges with weak foundations in tidal flats, characterized in that it comprises: Lofting and positioning steel pipe piles (1); Insert and drive steel pipe piles (1), and install distribution beams (2), Bailey beams (3) and bridge decks (4) on steel pipe piles (1), and install back pressure support frames on the side of steel pipe piles (1) (5) and jack (6); Place the load (11) on the bridge deck (4) to make the steel pipe pile (1) sink to the preset depth, and at the same time, the jack (6) lifts the distribution beam (2) to raise the bridge deck (4) to the preset depth. set height; A backing plate is placed between the top surface of the steel pipe pile (1) and the distribution beam (2). 7. the installation settlement method of a kind of tidal flat weak ground trestle bridge as claimed in claim 6, is characterized in that: on bridge deck (4), increase load (11) weight successively to bridge deck (4) carry out classification ballast, and The total amount of ballast is 1.25 times the bridge deck (4) lane load (11). 8. The installation and settlement method of a tidal flat weak foundation trestle bridge as claimed in claim 6, characterized in that: the top surface of the steel pipe pile (1) is provided with a steel pipe pile cap (10), and the backing plate Place it on the pile cap (10) of the steel pipe pile. 9. The method for installation and settlement of trestle bridges with weak foundations in tidal flats according to claim 6, characterized in that: the counter-pressure support frame (5) is welded to the side of the steel pipe pile (1).