CN103510473A - Construction method for large-span multi-arch solid-web uniform-section masonry arch bridge - Google Patents

Abstract

The invention discloses a construction method for a large-span multi-arch solid-web uniform-section masonry arch bridge. The construction method comprises the steps of cofferdam arrangement, pier platform construction, arch centering design, arch centering pre-compression and adjustment, arch ring structure construction, arch centering dismantlement and construction, and the like. The construction method provided by the invention is easy to carry out, and is safe; a water-free and dry operation environment is achieved, so that the quality of the bridge body and the construction safety are guaranteed; the main arc ring body and the arc centerings adopt fastener-type all-round steel tube scaffolds and bamboo plywood support systems, the materials are easy to obtain, and the economy is high; the arch centerings are pre-compressed before the arch rings are constructed, so that the safety is high; all the arc rings can be constructed at the same time under the premise that the materials and labor are adequate, so that the construction progress rate can be improved.

Description

The real abdomen formula of large span multiple arch uniform section circular arc barnacle Arch Bridge Construction method

Technical field

The present invention relates to the real abdomen formula of a kind of large span multiple arch uniform section circular arc barnacle Arch Bridge Construction method.

Background technology

Stone arch bridge beautiful design, sturdy and durable, with a long history, be widely used in the fields such as highway, municipal administration, traffic, its have draw materials conveniently, construct simple and easy, the feature such as construction costs is relatively low.But along with people's aesthetic conceptions improve constantly and high to bridge functional requirement level, stone arch bridge progressively presents the trend such as large span, heavy in section, multiple arch structure and high-bearing capacity, needs construction technology constantly progressive.

Summary of the invention

The object of the present invention is to provide a kind of easy construction, safety, the real abdomen formula of the measured large span multiple arch of matter uniform section circular arc barnacle Arch Bridge Construction method.

Technical solution of the present invention is:

The real abdomen formula of a multiple arch uniform section circular arc barnacle Arch Bridge Construction method, is characterized in that: comprise the following steps:

(1) cofferdam arranges

Weir, cofferdam body adopts backfill grinding compacting, and firmly, do not subside, both sides, cofferdam 1:1 does not reserve the gradient to weir body; After cofferdam forms, get rid of original river and laitance in the foundation ditch of cofferdam;

(2) bridge pier platform is built by laying bricks or stones

(1) build front inspection base surface absolute altitude, barnacle position measurement unwrapping wire, delineate line by laying bricks or stones;

(2) first build four jiaos of corner stones of pier and periphery, controlling verticality with plumb bob hanging wire on stone-laying material, finally build belly by laying bricks or stones;

(3) adopt to sit slurry method and build by laying bricks or stones, every layer of building stones height is identical, and fourth is along alternate or two arrange along a fourth;

(4) build flush joint by laying bricks or stones and perps width is not more than respectively 30mm and 40mm, the levels stone-laying fissure of displacement is not less than 100mm;

(5) block surfaces jointing is smooth vertical and horizontal, and the depth is consistent, and cross crotch overlap joint is smooth, does not occur blind seam, loses seam and the not firm phenomenon of bonding, and the degree of depth of jointing is entered the recessed 5mm of metope;

(6) mortar build by laying bricks or stones or the initial set of jointing mortar after, cover immediately watering, moist curing 7-14d;

(3) shelf's design on arch bridge

Every arch all adopts the full hall of console mode steel tube fastener bracing frame, and steel pipe is φ 48.3 * 3.6mm steel pipe, and panel adopts bamboo plywood to make arch;

(4) preloading centering and adjustment

(1) precompressed adopts sandstone pocket, by the deadweight and the distribution form that design arch ring barnacle, stacks, and during loading, symmetrical grade carried precompressed layout, prevents bow member bias voltage unstability;

(2) load to adopt segmentation precompressed, first edge pre-pressing across, then in precompressed across, last another end bay of precompressed;

(3) according to 25%, 50%, 75%, 100%, a 120% design load minute Pyatyi, load step by step;

(4) every grade has loaded observation 4-8h, guarantee to load axle casing and can fully be out of shape and reach and enter next stage after stable and load;

(5) each squeeze time is 3d, before loading first, first observation once, as initial observation, later every loaded is observed once, whole loadeds, and every 2h observation is once, after one day, every 6h observation once, observe 3d always, if observe every some deflection all be no more than 1mm at every turn, think that support is stable; After bracket stable, lay down sand material, during unloading, want layering to unload, after all unsnatching, measure the absolute altitude of bed die and ground, calculate the elastic deformation amount of support and ground, draw elastic deformation curve, as the foundation of adjusting template camber;

(6) precompressed is passed through the absolute altitude of adjustable jack adjusting pole according to precompressed achievement after completing, and after template adjustment completes, again checks that whether support and template be firm;

(7) layout of measuring point: first lay observation point on bed die and lower bracket top and bracket basis before ballast, measuring position is located at 1/2,1/4 place and centre of girder span, observation point, on template and ground, is cancelled to intermediate point along bridge on bed die; Before ballast, measure the original absolute altitude of observation point, and be recorded in detail;

(5) arch ring structure is built by laying bricks or stones

The General Requirements of building by laying bricks or stones:

1) radiating slot of arch ring is perpendicular to arch, and the puzzle joint of the adjacent two row voussoirs in radiating slot both sides staggers mutually, and the distance that staggers is not less than 100mm;

2) the puzzle joint width that grouts rubble ashlar and concrete precast block arch ring is 10～20mm, and the puzzle joint width of piece stone arch circle is not more than 30mm;

3) adopt work stone to build by laying bricks or stones, to work stone numbering, building stone by laying bricks or stones is wedge shape, and both sides are hair side, strengthen cementation between stone, and when peace is built, puzzle joint bottom is paved with mortar;

Build program by laying bricks or stones:

1) while building arch ring by laying bricks or stones, deformation observation seam is set, splashs at any time the deformation of bow member;

2) across footpath, be less than or equal to the arch ring of 10m, when with the formula bow member of being abound with, build by laying bricks or stones Shi，Cong two ends arch springing rise order symmetrical to vault direction, balancedly build by laying bricks or stones, finally build keystone;

3), across the arch ring of footpath 10～20m, every half builds by laying bricks or stones across being divided into three sections, first builds arch springing section and crown section, Hou Qi1/4Kua footpath section, and two halves across carrying out symmetrically simultaneously; When the Gong Duan，Qi angle of slope that segmentation is built by laying bricks or stones is greater than the angle of friction between building block and template, at arch section downside, support is set temporarily, avoids the slippage of arch section;

4) across footpath, be more than or equal to the arch ring of 20m, adopt the method that segmentation is built by laying bricks or stones or minute ring section combines to build by laying bricks or stones; Minute ring is when build by laying bricks or stones, until lower ring, builds by laying bricks or stones and closes up, after that puzzle joint mortar strength reaches design strength is more than 75%, then builds pressed on ring by laying bricks or stones;

(6) bow member Demolition Construction

(1) being abound with formula bow member circulates and unloads successively to arch springing from vault; The first step from vault to arch springing successively loose 8mm fix, carry out settlement observation, measuring point is identical with precompressed measuring point arrangement; Second step unloads 12mm, carries out settlement observation; The 3rd step unloads 15mm, carries out settlement observation, and not finding to unload inhomogeneous situation and exceed code requirement is dismountable support body;

(2), during porous centering unloading, if bridge pier allows to bear unilateral thrust, can unload by single hole, otherwise answer porous unload simultaneously or unload stage by stage.

Easy construction of the present invention, safety; Anhydrous dry environment operation, is conducive to guarantee pontic quality and construction safety; Main body arch ring bow member adopts fastener type full hall steel pipe scaffold and bamboo plywood support system, draw materials convenient, economy is high; Before arch ring masonry, bow member is implemented to precompressed measure, safe; In the situation that guaranteeing material and labour, each arch ring can be constructed simultaneously, is conducive to improve construction speed.

Below in conjunction with embodiment, the invention will be further described.

The specific embodiment

The real abdomen formula of a multiple arch uniform section circular arc barnacle Arch Bridge Construction method, comprises the following steps:

(1) cofferdam arranges

Weir, cofferdam body adopts backfill grinding compacting, and firmly, do not subside, both sides, cofferdam 1:1 does not reserve the gradient to weir body; After cofferdam forms, get rid of original river and laitance in the foundation ditch of cofferdam;

(2) bridge pier platform is built by laying bricks or stones

(1) build front inspection base surface absolute altitude, barnacle position measurement unwrapping wire, delineate line by laying bricks or stones;

(2) first build four jiaos of corner stones of pier and periphery, controlling verticality with plumb bob hanging wire on stone-laying material, finally build belly by laying bricks or stones;

(3) adopt to sit slurry method and build by laying bricks or stones, every layer of building stones height is identical, and fourth is along alternate or two arrange along a fourth;

(4) build flush joint by laying bricks or stones and perps width is not more than respectively 30mm and 40mm, the levels stone-laying fissure of displacement is not less than 100mm;

(5) block surfaces jointing is smooth vertical and horizontal, and the depth is consistent, and cross crotch overlap joint is smooth, does not occur blind seam, loses seam and the not firm phenomenon of bonding, and the degree of depth of jointing is entered the recessed 5mm of metope;

(6) mortar build by laying bricks or stones or the initial set of jointing mortar after, cover immediately watering, moist curing 7-14d;

(3) shelf's design on arch bridge

Every arch all adopts the full hall of console mode steel tube fastener bracing frame, and steel pipe is φ 48.3 * 3.6mm steel pipe, and panel adopts bamboo plywood to make arch;

(4) preloading centering and adjustment

(1) precompressed adopts sandstone pocket, by the deadweight and the distribution form that design arch ring barnacle, stacks, and during loading, symmetrical grade carried precompressed layout, prevents bow member bias voltage unstability;

(2) load to adopt segmentation precompressed, first edge pre-pressing across, then in precompressed across, last another end bay of precompressed;

(3) according to 25%, 50%, 75%, 100%, a 120% design load minute Pyatyi, load step by step;

(4) every grade has loaded observation 4-8h, guarantee to load axle casing and can fully be out of shape and reach and enter next stage after stable and load;

(5) each squeeze time is 3d, before loading first, first observation once, as initial observation, later every loaded is observed once, whole loadeds, and every 2h observation is once, after one day, every 6h observation once, observe 3d always, if observe every some deflection all be no more than 1mm at every turn, think that support is stable; After bracket stable, lay down sand material, during unloading, want layering to unload, after all unsnatching, measure the absolute altitude of bed die and ground, calculate the elastic deformation amount of support and ground, draw elastic deformation curve, as the foundation of adjusting template camber;

(6) precompressed is passed through the absolute altitude of adjustable jack adjusting pole according to precompressed achievement after completing, and after template adjustment completes, again checks that whether support and template be firm;

(7) layout of measuring point: first lay observation point on bed die and lower bracket top and bracket basis before ballast, measuring position is located at 1/2,1/4 place and centre of girder span, observation point, on template and ground, is cancelled to intermediate point along bridge on bed die; Before ballast, measure the original absolute altitude of observation point, and be recorded in detail;

(5) arch ring structure is built by laying bricks or stones

The General Requirements of building by laying bricks or stones:

1) radiating slot of arch ring is perpendicular to arch, and the puzzle joint of the adjacent two row voussoirs in radiating slot both sides staggers mutually, and the distance that staggers is not less than 100mm;

2) the puzzle joint width that grouts rubble ashlar and concrete precast block arch ring is 10～20mm, and the puzzle joint width of piece stone arch circle is not more than 30mm;

3) adopt work stone to build by laying bricks or stones, to work stone numbering, building stone by laying bricks or stones is wedge shape, and both sides are hair side, strengthen cementation between stone, and when peace is built, puzzle joint bottom is paved with mortar;

Build program by laying bricks or stones:

1) while building arch ring by laying bricks or stones, deformation observation seam is set, splashs at any time the deformation of bow member;

2) across footpath, be less than or equal to the arch ring of 10m, when with the formula bow member of being abound with, build by laying bricks or stones Shi，Cong two ends arch springing rise order symmetrical to vault direction, balancedly build by laying bricks or stones, finally build keystone;

3), across the arch ring of footpath 10～20m, every half builds by laying bricks or stones across being divided into three sections, first builds arch springing section and crown section, Hou Qi1/4Kua footpath section, and two halves across carrying out symmetrically simultaneously; When the Gong Duan，Qi angle of slope that segmentation is built by laying bricks or stones is greater than the angle of friction between building block and template, at arch section downside, support is set temporarily, avoids the slippage of arch section;

4) across footpath, be more than or equal to the arch ring of 20m, adopt the method that segmentation is built by laying bricks or stones or minute ring section combines to build by laying bricks or stones; Minute ring is when build by laying bricks or stones, until lower ring, builds by laying bricks or stones and closes up, after that puzzle joint mortar strength reaches design strength is more than 75%, then builds pressed on ring by laying bricks or stones;

(6) bow member Demolition Construction

(1) being abound with formula bow member circulates and unloads successively to arch springing from vault; The first step from vault to arch springing successively loose 8mm fix, carry out settlement observation, measuring point is identical with precompressed measuring point arrangement; Second step unloads 12mm, carries out settlement observation; The 3rd step unloads 15mm, carries out settlement observation, and not finding to unload inhomogeneous situation and exceed code requirement is dismountable support body;

(2), during porous centering unloading, if bridge pier allows to bear unilateral thrust, can unload by single hole, otherwise answer porous unload simultaneously or unload stage by stage.

Claims (1)

1. the real abdomen formula of a large span multiple arch uniform section circular arc barnacle Arch Bridge Construction method, is characterized in that: comprise the following steps:

(1) cofferdam arranges

Weir, cofferdam body adopts backfill grinding compacting, and firmly, do not subside, both sides, cofferdam 1:1 does not reserve the gradient to weir body; After cofferdam forms, get rid of original river and laitance in the foundation ditch of cofferdam;

(2) bridge pier platform is built by laying bricks or stones

(1) build front inspection base surface absolute altitude, barnacle position measurement unwrapping wire, delineate line by laying bricks or stones;

(2) first build four jiaos of corner stones of pier and periphery, controlling verticality with plumb bob hanging wire on stone-laying material, finally build belly by laying bricks or stones;

(3) adopt to sit slurry method and build by laying bricks or stones, every layer of building stones height is identical, and fourth is along alternate or two arrange along a fourth;

(4) build flush joint by laying bricks or stones and perps width is not more than respectively 30mm and 40mm, the levels stone-laying fissure of displacement is not less than 100mm;

(5) block surfaces jointing is smooth vertical and horizontal, and the depth is consistent, and cross crotch overlap joint is smooth, does not occur blind seam, loses seam and the not firm phenomenon of bonding, and the degree of depth of jointing is entered the recessed 5mm of metope;

(6) mortar build by laying bricks or stones or the initial set of jointing mortar after, cover immediately watering, moist curing 7-14d;

(3) shelf's design on arch bridge

Every arch all adopts the full hall of console mode steel tube fastener bracing frame, and steel pipe is φ 48.3 * 3.6mm steel pipe, and panel adopts bamboo plywood to make arch;

(4) preloading centering and adjustment

(1) precompressed adopts sandstone pocket, by the deadweight and the distribution form that design arch ring barnacle, stacks, and during loading, symmetrical grade carried precompressed layout, prevents bow member bias voltage unstability;

(2) load to adopt segmentation precompressed, first edge pre-pressing across, then in precompressed across, last another end bay of precompressed;

(3) according to 25%, 50%, 75%, 100%, a 120% design load minute Pyatyi, load step by step;

(4) every grade has loaded observation 4-8h, guarantee to load axle casing and can fully be out of shape and reach and enter next stage after stable and load;

(5) each squeeze time is 3d, before loading first, first observation once, as initial observation, later every loaded is observed once, whole loadeds, and every 2h observation is once, after one day, every 6h observation once, observe 3d always, if observe every some deflection all be no more than 1mm at every turn, think that support is stable; After bracket stable, lay down sand material, during unloading, want layering to unload, after all unsnatching, measure the absolute altitude of bed die and ground, calculate the elastic deformation amount of support and ground, draw elastic deformation curve, as the foundation of adjusting template camber;

(6) precompressed is passed through the absolute altitude of adjustable jack adjusting pole according to precompressed achievement after completing, and after template adjustment completes, again checks that whether support and template be firm;

(7) layout of measuring point: first lay observation point on bed die and lower bracket top and bracket basis before ballast, measuring position is located at 1/2,1/4 place and centre of girder span, observation point, on template and ground, is cancelled to intermediate point along bridge on bed die; Before ballast, measure the original absolute altitude of observation point, and be recorded in detail;

(5) arch ring structure is built by laying bricks or stones

The General Requirements of building by laying bricks or stones:

1) radiating slot of arch ring is perpendicular to arch, and the puzzle joint of the adjacent two row voussoirs in radiating slot both sides staggers mutually, and the distance that staggers is not less than 100mm;

2) the puzzle joint width that grouts rubble ashlar and concrete precast block arch ring is 10～20mm, and the puzzle joint width of piece stone arch circle is not more than 30mm;

3) adopt work stone to build by laying bricks or stones, to work stone numbering, building stone by laying bricks or stones is wedge shape, and both sides are hair side, strengthen cementation between stone, and when peace is built, puzzle joint bottom is paved with mortar;

Build program by laying bricks or stones:

1) while building arch ring by laying bricks or stones, deformation observation seam is set, splashs at any time the deformation of bow member;

2) across footpath, be less than or equal to the arch ring of 10m, when with the formula bow member of being abound with, build by laying bricks or stones Shi，Cong two ends arch springing rise order symmetrical to vault direction, balancedly build by laying bricks or stones, finally build keystone;

3), across the arch ring of footpath 10～20m, every half builds by laying bricks or stones across being divided into three sections, first builds arch springing section and crown section, Hou Qi1/4Kua footpath section, and two halves across carrying out symmetrically simultaneously; When the Gong Duan，Qi angle of slope that segmentation is built by laying bricks or stones is greater than the angle of friction between building block and template, at arch section downside, support is set temporarily, avoids the slippage of arch section;

4) across footpath, be more than or equal to the arch ring of 20m, adopt the method that segmentation is built by laying bricks or stones or minute ring section combines to build by laying bricks or stones; Minute ring is when build by laying bricks or stones, until lower ring, builds by laying bricks or stones and closes up, after that puzzle joint mortar strength reaches design strength is more than 75%, then builds pressed on ring by laying bricks or stones;

(6) bow member Demolition Construction

(1) being abound with formula bow member circulates and unloads successively to arch springing from vault; The first step from vault to arch springing successively loose 8mm fix, carry out settlement observation, measuring point is identical with precompressed measuring point arrangement; Second step unloads 12mm, carries out settlement observation; The 3rd step unloads 15mm, carries out settlement observation, and not finding to unload inhomogeneous situation and exceed code requirement is dismountable support body;

(2), during porous centering unloading, if bridge pier allows to bear unilateral thrust, can unload by single hole, otherwise answer porous unload simultaneously or unload stage by stage.