CN102776842A - Comprehensive technique method for reinforcing spandrel wall - Google Patents

Abstract

The invention relates to a comprehensive technique method for reinforcing spandrel wall and belongs to the field of building traffic engineering. The comprehensive technique method adopts the 'anchor bar opposite-pulling anchoring+ drain hole+ building seam grouting' trinitarian comprehensive reinforcing technological technique to solve the problems of extroversion, lateral protruding and the like of the spandrel wall of a solid-web type arch bridge, namely lateral deformation of the spandrel wall is avoided by opposite-pulling anchoring through an opposite-pulling rebar clamped steel plate. Seepage water in arch filler is timely removed by drilling water drainage holes so that lateral pressure of a soil body is reduced, and shear strength and integrity of the spandrel wall are improved by building seam grouting. By means of the comprehensive technique method, dismantling and rebuilding are not needed, traffic interruption cannot be caused, the construction period is short, the cost is low, the reinforcing effect is good, and the comprehensive technique method is widely applicable to side wall reinforcing of solid-web type stone-laying arch bridges.

Description

A kind of comprehensive technology method of reinforcing spandrel wall

Technical field

The present invention relates to a kind of comprehensive technology method that adds solid abdomen formula arch bridge spandrel wall, belong to building traffic engineering field.

Background technology

Bridge, aqueduct are the important buildings of crossing over river, cheuch, road, are the Adam's apples in the lifeline engineering such as road, water delivery, and its safety and non-stop run are the unimpeded important leverages of circuit.China is a bridge big country, has more than 50 ten thousand all kinds of bridges, and the quantity of water delivery aqueduct is also ten hundreds of, and the quantity of wherein real abdomen formula arch-type structure accounts for larger specific gravity.These structures are perhaps built the restriction of economic technology condition at that time owing to receiving; There is inadequate natural endowment; Perhaps because present operating load has exceeded the regulating scope of building at that time; Belong to overload operation, perhaps much have the disease problem, and the flare of spandrel wall, cracking, local external drum all are common diseases because the long term of external environment factor makes.At present, the reinforcing technique to the spandrel wall disease has spandrel structure (containing filler) to remove reconstruction method, dowel anchoring method, exterior wall shotcrete with steel bar nets method etc.Though wherein remove to rebuild effect good for spandrel structure, engineering quantity is big, expense is high, long in time limit, and need suspend traffic (or water delivery), influences bigger; Two kinds of methods in back and combination thereof have reinforces the advantage that operation does not influence the normal use of building; But the filled spandrel arch bridge consolidation effect for some impeded drainages is often not fully up to expectations; Main cause is that the rainfall isotonic water can not in time be got rid of, and the soil pressure that causes acting on side wall strengthens, especially cold weather after northern China is gone into the winter; The infiltration effect is encircleed upward down, and filler is the saturated soil body; Can act on the horizontal thrust of side wall because of the frost heave generation, thereby still can continue to produce displacement laterally, form disease once more at shear strength of masonry more weak position or the position far away apart from dowel.Therefore need find a kind of spandrel wall integrative consolidation technical method to the above-mentioned multiple complicated cause of disease.

Summary of the invention

The objective of the invention is to the spandrel wall effect structure that adopts traditional monotechnics scheme to reinforce under complicated factor (masonry mortar deterioration, infiltration effect and the external load increase etc.) effect undesirable; The defective that disease continues development or secondary disease occurs, a kind of economical rationality, the simple and reliable integrated comprehensive strengthening method of many technology are provided.

Unresolved above-mentioned technical problem, technical scheme of the present invention is: a kind of comprehensive technology method of reinforcing spandrel wall is characterized in that this method may further comprise the steps:

(1) sets up scaffold;

(2) bore the dowel hole, promptly bore the dowel hole from back side wall with horizontal drill;

(3) well cementing and joint bar anchoring are inserted plastic bushing after promptly accomplish in the dowel hole, and in the hole, are injected cement mortar; Afterwards, insert dowel immediately, lay the position of steel plate at needs and use the epoxy mortar application levelling; Steel plate is installed; When treating that epoxy mortar intensity reaches 50% left and right sides of theoretical strength (being generally 3 days), anchor bar is connected with bolt with steel plate, divides No. three times fastening bolt;

(4) drain hole construction, that is: at the Churn drill brill drain hole of design attitude with diameter 60mm, the degree of depth is 1.5 ~ 3.0m, inserts drain hole after the pvc pipe outsourcing geotextiles with head band permeable hole, with the gap of the cement mortar sealing mouth of pipe and boring;

(5) puzzle joint grouting construction; That is:, puzzle joint mortar strength relatively poor position serious in disease; Bore a grout hole along puzzle joint is every at a distance from 300mm ~ 700mm; Aperture 10mm ~ 15mm, then by from bottom to top, from left to right the order of (or from right to left) is by hole cement injection-stone flour slurry, it is 0.2 ~ 0.3MPa that grouting pressure is controlled at according to circumstances.

Advantage and good effect that the present invention has are: the difference of reinforcing the scheme of spandrel wall with traditional monotechnics measure is, adopts " dowel is to drawing anchoring+drain hole+puzzle joint grouting " Trinitarian integrative consolidation technical scheme.Relatively be applicable to the reinforcing of the spandrel wall disease that multiple complicated reason causes; Particularly go up the situation that filler has infiltration to accumulate for arch; Can effectively eliminate the cause of disease, prevent directly to strengthen soil body lateral pressure or cause the continuation development or the secondary disease of reinforcing the back side wall disease because of saturated body frost heaving significantly strengthens lateral pressure because of the infiltration effect.

Description of drawings

Fig. 1 dowel anchoring sketch.

Fig. 2 dowel, steel plate and drain hole are arranged sketch.

Fig. 3 anchoring drawing.

Among the figure: 1 is that dowel 2 is drain hole for steel plate 4 for epoxy mortar bed course 5 for side wall 3.

The specific embodiment

Now enumerate following construction embodiment, and conjunction with figs. further specifies to the present invention.

One three hole stone-laying filled spandrel arch bridge on certain mountain highway, build up in October, 1969, and design standard is vapour-15, hangs-80, strides the footpath l ₀=6m, rise f ₀=3m, f ₀ / l ₀=1/2, bridge floor clear span 8.5m, the long 67m of bridge, bridge floor beam overall 8.5m.Barricade adopts the M7.5 mortar to build by laying bricks or stones behind main arch circle, spandrel wall and the platform.Find that through field investigation this bridge side wall exists disease phenomenon, particularly back left hole side wall such as flare, middle drum, cracking and main arch circle that relative slippage has taken place, and the trend that makes further progress, should strengthening reconstruction.Carried out the side wall reinforcing according to the following steps.

(1) sets up scaffold;

(2) bore the dowel hole and execute brill from back side wall, require rig good to neutrality, the rolling momentum is little, each, two footage per round trips measure once, grasp the hole at any time to data;

(3) well cementing and joint bar are anchored at the dowel hole and get through back insertion plastic bushing, in the hole, inject cement mortar, insert dowel afterwards immediately; Lay the position of steel plate at needs and use the epoxy mortar application levelling; Steel plate is installed, is treated that intensity reaches 50% o'clock of theoretical strength, is connected with steel plate anchor bar with bolt; Divide three times fastening, the maximum total elongation of control reinforcing bar is 5mm;

(4) the drain hole construction uses the rig hole diameter to be 80mm at the position of outside spandrel wall, opening, the side drum is more serious, and length is the lateral aperture of 2.0m, and plastic drain-pipe is installed in the hole, and the part during gutter deeply bankets is for being permeable floral tube, floral tube outsourcing geotextiles;

(5) grouting machine HB series mortar pump is selected in puzzle joint grouting for use, and grout is arranged along metope puzzle joint cloth hole, pitch-row 600mm, aperture 15mm.Execute the filling order from bottom to top, from left to right finish until irritating along body of wall.Grouting pressure is about 0. 2MPa, by executing filling in the hole.Plug-hole material selection cohesive soil, grouting back full degree of mortar at bed joint is greater than 80%.

Claims (1)

1. comprehensive technology method of reinforcing spandrel wall is characterized in that this method may further comprise the steps:

(1) sets up scaffold;

(2) bore the dowel hole, promptly bore the dowel hole from back side wall with horizontal drill;

(3) well cementing and joint bar anchoring are inserted plastic bushing after promptly accomplish in the dowel hole, and in the hole, are injected cement mortar; Afterwards, insert dowel immediately, lay the position of steel plate at needs and use the epoxy mortar application levelling; Steel plate is installed; When treating that epoxy mortar intensity reaches 50% left and right sides of theoretical strength (being generally 3 days), anchor bar is connected with bolt with steel plate, divides No. three times fastening bolt;

(4) drain hole construction, that is: at the Churn drill brill drain hole of design attitude with diameter 60mm, the degree of depth is 1.5 ~ 3.0m, inserts drain hole after the pvc pipe outsourcing geotextiles with head band permeable hole, with the gap of the cement mortar sealing mouth of pipe and boring;

(5) puzzle joint grouting construction; That is:, puzzle joint mortar strength relatively poor position serious in disease; Bore a grout hole along puzzle joint is every at a distance from 300mm ~ 700mm; Aperture 10mm ~ 15mm, then by from bottom to top, from left to right the order of (or from right to left) is by hole cement injection-stone flour slurry, it is 0.2 ~ 0.3MPa that grouting pressure is controlled at according to circumstances.

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