CN101649621A - Technology for constructing anti-collision bridge pier by steel cofferdam - Google Patents

Abstract

The invention discloses a technique for constructing an anti-collision pier by using a steel cofferdam. A horizontal fixed bottom plate is arranged on the upper part of the pile steel casing; Higher than the water surface; pour the sealed foundation concrete on the bottom plate, and drain the water in the anti-collision steel cofferdam. The anti-collision steel cofferdam combines the dual functions of the conventional steel cofferdam water retaining function and the permanent anti-collision function of the pier into one , pouring caps on the sealed foundation concrete with the inner layer as a formwork; pouring bridge piers or tower columns on the caps; the invention adopts the anti-collision steel cofferdam structure of sandwich structure, which has better energy absorption effect, and the caps after pouring It is directly poured together with the inner plate of the casing. After construction, the anti-collision steel cofferdam plays a role in anti-collision, eliminating the need for disassembly and assembly of the formwork, thus simplifying the construction process, improving construction efficiency, and not occupying the main construction period. The bonding strength is high, and the bridge pier will not be damaged during construction, ensuring the construction quality.

Description

Technology of Constructing Anti-collision Piers Using Steel Cofferdams

technical field

The invention relates to a bridge structure, in particular to a technology for constructing anti-collision bridge piers with steel cofferdams.

Background technique

The anti-collision measures of bridge piers are an important means to ensure the safety of bridges, and the main danger comes from ships colliding with bridge piers. The anti-collision measures for bridge piers are to prevent ships from damaging the piers. They mainly include directly connected anti-collision devices and indirect anti-collision devices. Anti-collision problem, but it occupies a large area, so it can only be installed in the river bed with shallow water depth and good foundation. It is not suitable for use in waters with small river area. At the same time, the construction cost is high; the directly connected anti-collision device is installed directly To protect the pier on the pier, including elastic deformation structure, plastic deformation buffer structure, etc., it is generally used to fix elastic or plastic deformation devices around the pier, absorb energy through elastic deformation and plastic deformation, and resist the impact on the pier. The elastically deformable anti-collision device can only be applied to occasions where the impact force is small or not directly impacted. The anti-collision device of the plastic deformation buffer structure relies on plastic deformation to buffer the impact of the ship on the pier. The structure has a small volume, occupies a small water area, and has a better energy absorption effect. In the prior art, the plastic deformation buffer structure is generally used to install plastic deformation sleeves around the formed pier. The construction process is complicated, the construction efficiency is low, and the main construction period is occupied. Moreover, the bonding strength with the pier is not high, causing certain damage to the pier. Construction The quality is poor.

Therefore, there is a need for a bridge pier anti-collision technology, which not only has a better energy absorption effect, but also can simplify the construction process during installation and use, improve construction efficiency, do not occupy the main construction period, and have a high bonding strength with the bridge pier. It will not cause damage to the bridge pier at any time and ensure the construction quality.

Contents of the invention

In view of this, the present invention provides a technology for constructing anti-collision bridge piers using steel cofferdams, which not only has a better energy absorption effect, but also simplifies the construction process during installation and use, improves construction efficiency, and does not occupy the main construction period. Moreover, the bonding strength with the bridge pier is high, and the bridge pier will not be damaged during construction, ensuring the construction quality.

The technology of utilizing steel cofferdam construction anti-collision pier of the present invention comprises the following steps:

a. Construct the pile foundation, and set a horizontal fixed bottom plate on the upper part of the pile steel casing;

B. put the prefabricated anti-collision steel cofferdam upright on the base plate, so that the top of the anti-collision steel cofferdam is higher than the water surface; the anti-collision steel cofferdam includes an inner layer and an outer layer, and the inner layer and the outer layer are respectively Enclosed and fixedly connected by connectors to form a sandwich structure box;

c. Pouring sealed foundation concrete on the bottom plate, draining the water in the anti-collision steel cofferdam, and pouring caps on the sealed foundation concrete with the inner layer as a template;

d. Pouring piers or pylons on the caps.

Further, the inner surface of the inner layer and the outer layer in step b are respectively provided with vertical stiffeners and horizontal stiffeners;

Further, the connector includes horizontal braces arranged side by side and respectively welded to the inner surfaces of the inner layer and the outer layer, and the horizontal braces are arranged horizontally to form a row of horizontal braces;

Further, a horizontal partition is fixedly arranged between the cross braces in the same horizontal plane, and a vertical partition is welded between the inner surface of the inner layer and the inner surface of the outer layer;

Further, the distance between adjacent rows of braces shall not be less than 0.5m;

Further, the anti-collision steel cofferdam is supported on the platform through support legs evenly distributed around the outer surface of the inner layer, and in step c, the gap between the top surface of the platform and the support legs is eliminated by pouring concrete;

Further, the top surface of the bearing platform is provided with a concrete block along the circumference, and the concrete block is close to the surface of the inner layer;

Further, the vertical stiffeners and horizontal stiffeners both include strong ribs and weak ribs, the strong ribs are made of I-shaped steel welded to the inner surface of the inner layer and the outer layer, and the weak ribs are formed by angle steel welded to the inner layer and the outer layer The inner surface composition of the layer;

Further, at least two weak ribs are arranged between adjacent strong ribs.

Beneficial effects of the present invention: the technology of using steel cofferdams to construct anti-collision bridge piers of the present invention adopts interlayer structure anti-collision steel cofferdam structures, which has better energy absorption effect. When installing, the prefabricated anti-collision steel The cofferdam is set at the construction site of the bridge pier. After piling, a bottom plate is set on the top of the pile. The anti-collision steel cofferdam is placed on the bottom plate, and the foundation concrete is poured on the bottom plate. The impact steel cofferdam combines the dual functions of the conventional steel cofferdam water retaining function and the permanent anti-collision function of the pier. To prevent collision, the anti-collision steel cofferdam is directly used as a formwork during construction, which saves the disassembly and assembly process of the formwork, so the construction process can be simplified, the construction efficiency can be improved, the main construction period is not occupied, and the bonding strength with the bridge pier is high. It will not cause damage to the bridge pier at any time and ensure the construction quality.

Description of drawings

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

Fig. 1 is the structure schematic diagram after the present invention is installed;

Fig. 2 is the top view of Fig. 1;

Fig. 3 is a schematic diagram of a transverse cross-sectional structure of the present invention;

Fig. 4 is a schematic view of the longitudinal section structure of the present invention.

Detailed ways

Fig. 1 is a schematic diagram of the structure after installation of the present invention, Fig. 2 is a top view of Fig. 1, Fig. 3 is a schematic diagram of a transverse section structure of the present invention, and Fig. 4 is a schematic diagram of a longitudinal section structure of the present invention, as shown in the figure: the utilization of steel in this embodiment The technology of cofferdam construction anti-collision pier includes the following steps:

a. Piling at the bottom of the water, and fixing the bottom plate 12 horizontally on the top of the pile 9;

B. put the prefabricated anti-collision steel cofferdam upright on the base plate, so that the top of the anti-collision steel cofferdam is higher than the water surface; the anti-collision steel cofferdam includes an inner layer 2 and an outer layer 1, and the inner layer 2 and The outer layers 1 are respectively surrounded and fixedly connected by connectors to form a sandwich structure box. In this embodiment, the inner surfaces of the inner layer 2 and the outer layer 1 are respectively provided with vertical stiffeners 4 and horizontal stiffeners 5. The vertical stiffeners The ribs 4 and the horizontal stiffeners 5 both include strong ribs and weak ribs, the strong ribs are made of I-shaped steel welded to the inner surface of the inner layer 2 and the outer layer 1, and the weak ribs are angle steel welded to the inner layer 2 and the outer layer 1 The inner surface of the structure; five weak ribs are set between adjacent strong ribs, and a stiffening rib structure is set, which is conducive to ensuring the strength of the inner layer 2 and the outer layer 1, thereby ensuring the anti-collision function of the pier anti-collision steel cofferdam and prolonging the service life; The layout structure of strong ribs and weak ribs can reduce the weight of the anti-collision steel cofferdam and save the production cost under the premise of ensuring the anti-collision function; the connecting parts include horizontal braces arranged side by side and welded to the inner surface of the inner layer 2 and outer layer 1 respectively 3. The cross braces 3 are arranged horizontally to form cross brace rows, and the distance between adjacent cross brace rows is not less than 0.5m to ensure strength and save materials; horizontal partitions 6 are fixedly arranged between the cross braces 3 in the same horizontal plane, Strengthen the horizontal connection between the cross braces 3 to further ensure the anti-collision strength; the vertical partition (not shown in the figure) is welded between the inner surface of the inner layer 2 and the outer layer 1, and the horizontal partition together ensures the anti-collision steel enclosure The distance between the inner layer and the outer layer of the weir improves the anti-collision characteristics; the height of the top edge of the anti-collision steel cofferdam is determined according to the anti-collision requirements of the pier, and the height of the bottom edge is determined by the design elevation of the cap bottom sealing concrete .

c. Pouring the sealed foundation concrete 13 on the bottom plate 12, draining the water in the anti-collision steel cofferdam, pouring the cap 10 on the sealed foundation concrete 13 with the inner layer 2 as a template, the construction is simple and convenient, and the template is omitted, which can greatly shorten the construction time. Construction period: the upper part of the anti-collision steel cofferdam is located on the outer surface of the inner layer 2 (that is, the contact surface between the anti-collision steel cofferdam and the cap 10), and the support legs 8 extending to the center line of the box are evenly arranged around the outer surface of the inner layer 2, and the top surface of the cap and the support The gap between the legs is eliminated by pouring concrete 15, and the bearing platform 10 is used to bear the weight of the anti-collision steel cofferdam to ensure installation and anti-collision strength; the top surface of the platform 10 is provided with a concrete stop 14 along the circumference, and the concrete stop 14 Close to the outer surface of the inner layer to ensure that the structural strength is increased during the anti-collision process and the anti-collision performance is improved;

d. Pouring piers or tower columns 11 on the caps 10 .

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be carried out Modifications or equivalent replacements without departing from the spirit and scope of the technical solution of the present invention shall be covered by the claims of the present invention.

Claims (9)

1. technology of utilizing the steel cofferdam constructing anti-collision bridge pier is characterized in that: may further comprise the steps:

A. construction stake basis, and the horizontal fixed base plate is set on stake steel casing top;

B. prefabricated crashproof steel cofferdam is stood up on base plate, crashproof steel cofferdam is risen in the water surface; Described crashproof steel cofferdam comprises internal layer and skin, and described internal layer and skin surround respectively and be fixedly connected to form the sandwich casing by connector;

C. the basic concrete of cast sealing on base plate is drained the water in the crashproof steel cofferdam, is template cast cushion cap with the internal layer on the basic concrete of sealing;

D. on cushion cap, pour into a mould bridge pier or king-post.

2. the technology of utilizing the steel cofferdam constructing anti-collision bridge pier according to claim 1 is characterized in that: internal layer among the step b and outer field inner surface are provided with vertical stiffening rib and horizontal stiffening rib respectively.

3. the technology of utilizing the steel cofferdam constructing anti-collision bridge pier according to claim 2 is characterized in that: connector comprise be set up in parallel and respectively with the stull of internal layer and outer inner surface welding, described stull horizontally forms stull row.

4. the technology of utilizing the steel cofferdam constructing anti-collision bridge pier according to claim 3 is characterized in that: fixedly install horizontal baffle between the stull in the described same horizontal plane, weld vertical clapboard between internal layer and the outer inner surface.

5. the technology of utilizing the steel cofferdam constructing anti-collision bridge pier according to claim 4 is characterized in that: the spacing between the adjacent stull row is not less than 0.5m.

6. the technology of utilizing the steel cofferdam constructing anti-collision bridge pier according to claim 5, it is characterized in that: described crashproof steel cofferdam is bearing on the cushion cap by the supporting leg of uniform setting around the inner layer outer surface, among the step c, eliminate the gap by pour concrete between cushion cap end face and the supporting leg.

7. the technology of utilizing the steel cofferdam constructing anti-collision bridge pier according to claim 6 is characterized in that: the cushion cap end face is along circumferentially being provided with the concrete block, and described concrete block is near the internal layer surface.

8. according to the described technology of utilizing the steel cofferdam constructing anti-collision bridge pier of the arbitrary claim of claim 1 to 7, it is characterized in that: described vertical stiffening rib and horizontal stiffening rib include strong rib and weak rib, described strong rib is that i iron is welded on internal layer and outer field inner surface constitutes, and weak rib is that angle steel is welded on internal layer and outer field inner surface constitutes.

9. the technology of utilizing the steel cofferdam constructing anti-collision bridge pier according to claim 8 is characterized in that: at least two weak ribs are set between the adjacent strong rib.

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