CN105350458A - Construction method of composite structure platform for construction of Y-shaped pier of bridge - Google Patents

Abstract

The invention discloses a method for installing a combined structure platform for the construction of a Y-shaped pier of a bridge. A plurality of horizontal pre-embedded steel plates are arranged at intervals on the top surface of the cap formwork on the left and right sides of the column of the Y-shaped pier; (2) pouring caps; Multiple steel beams; (4) Pouring the columns of Y-shaped piers; (5) Welding and connecting the bottom ends of multiple concrete-filled steel tube diagonal braces to the vertical pre-embedded steel plates and horizontal pre-embedded steel plates respectively, and welding the other ends to the corresponding (6) Lay Bailey beams and distribution beams sequentially on multiple steel beams on the same side; (7) Lay Y-shaped pier formwork support frames on the distribution beams on the left and right sides respectively. The method greatly improves the shear strength of the concrete.

Description

A construction method of composite structure platform for bridge Y-shaped pier construction

technical field

The invention relates to the field of bridge construction, in particular to a combined structure platform for construction of a bridge Y-shaped pier and an installation method thereof.

Background technique

At present, the known Y-shaped bridge construction platforms have multiple methods, but certain problems still exist. Generally speaking, it is not suitable for geological conditions where the muddy overburden is too thick and relatively hard rock formations, and the strength of the pier body cannot be effectively used to transmit vertical loads. It is a big waste, and it cannot be cut off underwater under the condition of high navigation requirements. The universality is poor, and the load-bearing performance of the steel platform cannot be maximized.

The construction method of the large-angle Y-shaped pier column announced by publication number CN104746435A adopts a large number of steel pipe pile structures and cable-stayed structure systems, requires a large amount of piling construction, and consumes a large amount of steel. After the construction of the Y-shaped pier is completed, the steel pipe piles are not easy to be pulled out, and the method of cutting can only be used, resulting in waste of materials.

Publication number CN202390763U announces the bridge V-shaped bridge pier concrete structure formwork supporting frame, and the V-shaped supporting frame that it adopts is the method for carrying out cap beam concrete structure construction after V-limb construction, can not effectively apply and V-limb construction.

Publication numbers C102888815A and CN202954299U disclose a large-angle V-shaped pier and a pouring construction method for 0# block box girders, which require a large number of supports to be laid, and the material consumption is large, and the foundation also needs to be treated.

A kind of Y-shaped pier formwork and support system announced by publication number CN203007846U and the V-shaped pier inclined leg combined support and layered cast-in-place construction method of continuous rigid frame bridge announced by publication number CN101481902A, its erection depends on the bridge body Surrounding piles and additionally drilled bored piles, and the layout of multiple pairs of tie bars, the support connection is complicated, which makes the program poor adaptability and difficult to implement during the implementation process. Cap structure of hole piles.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a construction method of a combined structure platform for the construction of bridge Y-shaped piers with high installation efficiency, little influence on the inherent structure, strong applicability and large bearing capacity.

To achieve the above object, the present invention adopts the following technical solutions:

A method for installing a combined structure platform for bridge Y-shaped pier construction of the present invention comprises the following steps:

(1) On the left and right sides of the cap formwork, a plurality of vertical pre-embedded steel plates are arranged at intervals along the longitudinal direction of the cap, and on the top surface of the cap formwork on the left and right sides of the column of the Y-shaped pier to be poured along the longitudinal direction of the cap Set multiple horizontal pre-embedded steel plates at intervals;

(2) Pouring caps in cap formwork;

(3) On both sides of the column of the Y-shaped pier to be poured, a plurality of shaped steel beams of equal height are respectively supported in the horizontal direction and the inner sides of the plurality of shaped steel beams are pierced on the Y-shaped pier to be poured In the column, then pass the steel bar of the column of the Y-shaped pier to be poured through the correspondingly provided steel beam inner flange and the preset reinforcement hole on the web to connect the steel beam with the steel bar of the Y-shaped column;

(4) Pouring the columns of the Y-shaped piers;

(5) When the concrete strength of the column of the Y-shaped pier meets the requirements, the bottom ends of multiple concrete-filled steel tube diagonal braces are respectively welded and connected to the vertical pre-embedded steel plate and the horizontal pre-embedded steel plate, and the other ends are respectively welded to the corresponding set on steel beams;

(6) Laying Bailey beams on a plurality of shaped steel beams on the same side that have been supported, and said Bailey beams and shaped steel beams are fixed by spot welding and fasteners;

(7) lay distribution beam respectively on the Bailey beam described in left and right sides, and described distribution beam adopts fastener and spot welding to connect with Bailey beam;

(8) Arrange Y-shaped pier formwork support frames on the distribution beams on the left and right sides according to the V-shaped outer wall shape of the upper part of the Y-shaped pier to be poured.

The beneficial effects of adopting the present invention are:

(1) The platform is finally supported on the cap platform by concrete-filled steel pipe diagonal braces and connected to the piers by pre-embedded methods. There is no requirement for the geological conditions of the lower part, and it is easy to install and dismantle, with less steel consumption and convenient construction;

(2) The concrete filled steel tube has good mechanical properties, and it has better compressive performance than the traditional steel tube support structure.

(3) The original steel bars of the pier column structure can pass through the steel bar holes of the shaped steel beams, and the layout of the inherent steel bars of the structure will not be affected by the pre-embedded connection of the shaped steel beams;

(4) The steel bars penetrated into the flange of the shaped steel beam and the web with the steel bar holes improve the ductility of the anchorage structure and avoid the brittle failure of the anchorage system;

(5) During the pouring process, the performance of the concrete at the opening will be improved, greatly increasing the shear strength of the concrete;

(6) The combination system is applicable to the oblique-leg pouring construction platform of Y-shaped piers with any pier body height and angle of oblique legs known so far, and has high strength and flexible layout.

Description of drawings

Fig. 1 is the front view of the bridge Y-shaped pier structure that adopts the installation method of the composite structure platform of bridge Y-shaped pier construction of the present invention to build;

Fig. 2 is the front view of the construction process of the installation method of the combined structure platform for the construction of a bridge Y-shaped pier of the present invention;

Fig. 3 is a detailed structural diagram of the section A where the shaped steel beams are buried shown in Fig. 2 .

detailed description

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

A construction method of a composite structure platform for bridge Y-shaped pier construction of the present invention, it comprises the following steps:

(1) On the left and right sides of the cap formwork, a plurality of vertical pre-embedded steel plates 8 are arranged at intervals along the longitudinal direction of the cap, and on the top surface of the cap formwork on the left and right sides of the column 2 of the Y-shaped pier to be poured A plurality of horizontal pre-embedded steel plates 9 are respectively arranged at intervals in the longitudinal direction of the platform;

(2) Pouring the cap 1 in the cap formwork;

(3) On both sides of the column 2 of the Y-shaped pier to be poured, a plurality of shaped steel beams 4 of equal height are respectively supported in the horizontal direction and the inner sides of the plurality of shaped steel beams 4 are pierced on the Y-shaped pier to be poured. In the column 2 of the shaped pier, the steel bars 10 of the column 2 of the Y-shaped pier to be poured pass through the correspondingly provided shaped steel beam 4 inner flange and the preset reinforcing bar hole 11 on the web to make the shaped steel beam 4 and Y The steel bar 10 of the column 2 of the pier is connected;

(4) Pouring the column 2 of the Y-shaped pier;

(5) When the concrete strength of the column 2 of the Y-shaped pier meets the requirements, the bottom ends of multiple steel tube concrete diagonal braces 3 are respectively welded and connected to the vertical pre-embedded steel plate 8 and the horizontal pre-embedded steel plate 9 and the other ends are respectively welded to the Correspondingly set on the shaped steel beam 4;

(6) Lay the Bailey beam 5 on the same side many steel beams 4 that have been supported, and the Bailey beam 5 and the steel beam 4 are fixed by spot welding and fasteners;

(7) lay distribution beam 6 respectively on the Bailey beam 5 described in left and right sides, and described distribution beam 6 adopts fastener and spot welding to connect with Bailey beam 4;

(8) Arrange Y-shaped pier formwork support frames 7 on the distribution beams 6 on the left and right sides according to the V-shaped outer wall shape of the upper part of the Y-shaped pier to be poured.

The structure of the combined structure platform for the construction of the Y-shaped pier of the bridge poured by the method of the present invention comprises: a plurality of vertical pre-embedded steel plates 8 are respectively arranged at intervals on the left and right sides of the cap 1; A plurality of horizontal pre-embedded steel plates 9 are respectively arranged at intervals along the longitudinal direction of the cap on the top surface of the cap, and a plurality of shaped steel beams 4 of equal height are respectively supported along the horizontal direction on both sides of the column 2 of the Y-shaped pier. And make the inside of the plurality of shaped steel beams 4 pass through the column 2 of the Y-shaped pier, and the steel bars 10 of the column 2 of the Y-shaped pier pass through the inner flanges and webs of the corresponding shaped steel beams 4 The steel bar holes 11 preset on the board connect the shaped steel beam 4 with the steel bar 10 of the column 2 of the Y-shaped pier, and the bottom ends of multiple steel tube concrete diagonal braces 3 are respectively welded and connected to the vertical pre-embedded steel plate 8 and the horizontal pre-embedded steel plate 9 and the other ends are respectively welded on corresponding shaped steel beams 4, on the same side multiple shaped steel beams 4 are fixed with Bailey beams 5, and on the left and right sides said Bailey beams 5 are respectively fixed with distribution Beam 6, Y-shaped pier formwork support frames 7 are arranged on the distribution beams 6 on the left and right sides according to the shape of the V-shaped outer wall of the upper part of the Y-shaped pier to be poured.

Example 1

(1) On the left and right sides of the cap formwork, a plurality of vertical pre-embedded steel plates 8 are arranged at intervals along the longitudinal direction of the cap, and on the top surface of the cap formwork on the left and right sides of the column 2 of the Y-shaped pier to be poured A plurality of horizontal pre-embedded steel plates 9 are respectively arranged at intervals in the longitudinal direction of the platform;

(2) Pouring the cap 1 in the cap formwork;

(3) On both sides of the column 2 of the Y-shaped pier to be poured, a plurality of shaped steel beams 4 of equal height are respectively supported in the horizontal direction and the inner sides of the plurality of shaped steel beams 4 are pierced on the Y-shaped pier to be poured. In the column 2 of the shaped pier, the steel bars 10 of the column 2 of the Y-shaped pier to be poured pass through the correspondingly provided shaped steel beam 4 inner flange and the preset reinforcing bar hole 11 on the web to make the shaped steel beam 4 and Y The steel bar 10 of the column 2 of the pier is connected;

(4) Pouring the column 2 of the Y-shaped pier;

(5) When the concrete strength of the column 2 of the Y-shaped pier meets the requirements, the bottom ends of multiple steel tube concrete diagonal braces 3 are respectively welded and connected to the vertical pre-embedded steel plate 8 and the horizontal pre-embedded steel plate 9 and the other ends are respectively welded to the Correspondingly set on the shaped steel beam 4;

(6) Lay the Bailey beam 5 on the same side many steel beams 4 that have been supported, and the Bailey beam 5 and the steel beam 4 are fixed by spot welding and fasteners;

(7) Lay distributing beam 6 respectively on Bailey beam 5 described in left and right sides, described distributing beam 6 adopts fastener and spot welding to connect with Bailey beam 4;

(8) Arrange Y-shaped pier formwork support frames 7 on the distribution beams 6 on the left and right sides according to the V-shaped outer wall shape of the upper part of the Y-shaped pier to be poured.

The concrete of the Y-shaped pier is poured with the support frame 7 of the Y-shaped pier formwork. It has been tested that the concrete filled steel tube has good mechanical properties, and has better compressive performance than the traditional steel tube support structure.

Claims (1)

1. a bridge Y type pier construction mounting method for combining structure platform, is characterized in that it comprises the following steps:

(1) in the left and right sides of cushion cap template, multiple vertical pre-embedded steel slab be set along the longitudinal interval respectively of cushion cap and on the end face of the cushion cap template of the column left and right sides of Y type pier to be built, multiple horizontal pre-embedded steel slab be set along the longitudinal interval respectively of cushion cap;

(2) in cushion cap template, cushion cap is built;

(3) install many root type girder steel of equal altitudes in the column both sides of Y type pier to be built respectively in the horizontal direction and make the inner side of described many root type girder steel be located in the column of Y type pier to be built, then through the reinforced hole that the edge of a wing inside the corresponding section steel beam arranged and web are preset, section steel beam being connected with the reinforcing bar of the column of Y type pier the reinforcing bar of the column of Y type pier to be built;

(4) column of Y type pier is built;

(5) when the concrete strength of the column of Y type pier reaches requirement, many concrete filled steel tube diagonal brace bottoms to be welded to connect respectively on vertical pre-embedded steel slab and horizontal pre-embedded steel slab and the other end is welded on the corresponding section steel beam arranged respectively;

(6) on many root type girder steel of the homonymy supported, lay Bailey beam, described Bailey beam and section steel beam take spot welding and securing member to be fixed;

(7) in Bailey beam described in the left and right sides, lay distribution beam respectively, described distribution beam and Bailey beam adopt securing member and spot welding to be connected;

(8) the outer wall shape respectively according to Y type socle V-arrangement to be built in the distribution beam of the left and right sides lays Y type pier formwork-support.