鋼筋網(wǎng)片被用在橋梁防固工程分析， 作為關(guān)系人類生命的交通要塞，鋼筋網(wǎng)片在防固工程中是關(guān)重要的。
Reinforcement mesh is used in bridge anti-consolidation engineering analysis. As a traffic fortress related to human life and safety, reinforcement mesh is very important in anti-consolidation engineering.
1.原橋主梁加固
1. reinforcement of main girder of original bridge
一是要使用墩頂上兩孔梁端空間設(shè)置現(xiàn)澆橫向懸臂挑梁，其上安裝預(yù)制的微彎板。二是在挑梁懸臂部分架起預(yù)制的形人行道梁。兩頭橋孔人行道梁較主梁長(zhǎng)，一端支承在邊墩挑梁上一端支承在路堤上特設(shè)的支墩上，此舉系為了防止加寬橋臺(tái)。三是在人行道梁內(nèi)側(cè)的凸緣與舊橋面板間，用混凝土澆筑橋面加寬部分，橋面鋪裝層混凝土同時(shí)澆筑構(gòu)成行車道，在橋面鋪裝層及橋面加寬部分，均設(shè)置了鋼筋網(wǎng)，使全體功能加強(qiáng)。四是橋面伸縮縫設(shè)置在挑梁頂中心，將行車道鋪裝延伸搭架在挑梁上構(gòu)成。
One is to install cast-in-situ transverse cantilever beam in the space of two holes at the end of beam on pier top, and install prefabricated micro-bending plate on it. Secondly, the prefabricated pedestrian beam is erected in the cantilever part of the cantilever beam. The pedestrian beams with two bridge holes are longer than the main beams, and one end is supported on the side pier cantilever beam and the other end is supported on the special piers on the embankment. This is to prevent widening the abutment. Thirdly, between the flange of the inner side of the pedestrian beam and the old bridge deck, concrete is used to cast the widened part of the bridge deck. The concrete of the bridge deck pavement layer is concretely poured to form the carriageway. In the pavement of the bridge deck and the widened part of the bridge deck, the reinforcing steel mesh is set up to strengthen all the functions. Fourthly, the bridge deck expansion joint is set in the center of the overhanging beam, and the carriageway pavement is extended and erected on the overhanging beam.
2.橋面清理
2. deck cleaning
原橋面多缺乏安穩(wěn)而堅(jiān)實(shí)的底層，全體性差，有必要將原橋面徹底，并挖除部分砂礫墊層(假如是非砂礫填料，有必要挖除，換上砂礫填料，夯實(shí))，再加鋪水泥安穩(wěn)砂礫底層，其上澆筑鋼筋砼橋面。
Most of the original deck lacks a stable and solid bottom, and its integrity is poor. It is necessary to completely remove the original deck and dig out part of the gravel cushion (if it is non-gravel filler, it is necessary to dig out, replace the gravel filler, compact), and then lay the cement stabilized gravel bottom layer, on which the reinforced concrete deck is poured.
3.拓展加固
3. development and reinforcement
適當(dāng)操控交通，邊通車邊拓展加固。因?yàn)榭梢允褂迷卸张_(tái)，拓展加固主要在上部構(gòu)造上進(jìn)行，因而可節(jié)省更多出資。只需拓展加固計(jì)劃得當(dāng)，亦可滿意規(guī)劃荷載要求。
Proper control of traffic, while opening, expansion and reinforcement. Because the original piers and abutments can be used, the expansion and reinforcement are mainly carried out on the upper structure, so more investment can be saved. As long as the reinforcement plan is properly expanded, the planning load requirements can also be satisfied.
4.橋臺(tái)后座加固
4. abutment reinforcement
將橋臺(tái)后座上路面除去，改成38#鋼筋砼單向簡(jiǎn)支預(yù)制板，支承于兩側(cè)墻上。用直徑25mm的錨固鋼筋使之與側(cè)墻相接，其上鋪裝砼橋面，鋼筋砼板與后座填料間留有空地，以使活載壓力直接效果在側(cè)墻上，然后減去了活載引起的對(duì)側(cè)墻的土壓力，并增加側(cè)墻抗剪才能和基底摩阻力。
The pavement on the back seat of abutment is removed and replaced by 38 # reinforced concrete one-way simply supported prefabricated slab, which is supported on both sides of the wall. The anchoring steel bar with diameter of 25mm is used to connect the side wall. The concrete bridge deck is paved on it, and there is space between the reinforced concrete slab and the backseat filling, so that the live load pressure can be directly applied to the side wall, then the earth pressure on the opposite side wall caused by the live load is reduced, and the shear capacity of the side wall and the friction resistance of the base are increased.
5.主拱圈加固
5. main arch reinforcement
原橫系粱尺度偏小，橫向聯(lián)系差，屬單薄構(gòu)件，針對(duì)這一病害，將原橫系梁截面尺度加大，把拱頂部分橫系梁改為橫隔板，以加強(qiáng)橫向全體性，使全拱寬一起受力。因?yàn)橹鞴叭κ芰Υ螅芽p多，選用拱肋及拱波部分外包鋼筋網(wǎng)并噴發(fā)砼加固拱圈截面，以提高各孔的全體剛度和承載力。
In view of this disease, the cross-sectional dimension of the original cross-tied beam is enlarged, and the arch top part of the cross-tied beam is replaced by the diaphragm to strengthen the transverse integrity and force the whole arch width together. Because the main arch ring has large force and many cracks, the arch rib and arch wave part are used to wrap steel mesh and spray concrete to reinforce the arch ring section, so as to improve the stiffness and bearing capacity of all holes.
6.主梁負(fù)彎矩的加固
6. Reinforcement of Negative Bending Moment of Main Girder
主粱負(fù)彎矩區(qū)在一般荷載下即發(fā)生很多裂縫，其上橋面鋪裝層亦發(fā)生很多網(wǎng)裂。此種裂縫不只不美觀，在實(shí)際上也會(huì)因雨水滲人主梁和翼緣板中，導(dǎo)致銹蝕受力鋼筋，影響橋梁使用壽命。在考慮加固計(jì)劃時(shí)，依據(jù)核算材料增加縱向受拉鋼筋，置于原鋪裝層范圍內(nèi)，因?yàn)樾乱?guī)劃標(biāo)準(zhǔn)的荷載負(fù)彎矩效果，橋面砼的拉應(yīng)力將到達(dá)3．96MPa，選用鋼纖維砼，其抗拉規(guī)劃強(qiáng)度有或許大于此拉應(yīng)力，然后保證橋面不呈現(xiàn)裂縫。在加固中應(yīng)對(duì)負(fù)彎 區(qū)橋面鋪裝層選用澆筑鋼纖維砼，要求其與粱頂翼緣板真正牢固連成全體。
There are many cracks in the negative bending moment area of the main girder under general loads, and there are also many net cracks in the upper deck pavement. Such cracks are not only beautiful, but also cause corrosion of steel bars in the main girders and flange plates due to rain water, which affects the service life of bridges. When considering the reinforcement plan, the longitudinal tension reinforcement bar is added according to the accounting material and placed in the original pavement. Because of the negative bending moment effect of the new planning standard, the tensile stress of the bridge deck concrete will reach 3.96 MPa. The steel fiber concrete is selected, whose tensile planning strength may be greater than the tensile stress, and then the crack will not appear on the bridge deck. 。 In reinforcement, steel fiber concrete should be used for bridge deck pavement in negative bending area, and it should be firmly connected with the flange slab of beam roof.
7.主粱及掛梁正彎矩區(qū)加固
7. Reinforcement of main girder and hanging girder in positive bending moment zone
辦法是在鑿去原橋面鋪裝層及油毛氈后，將原橋面打毛，用錨桿在原鋪裝層厚度范圍內(nèi)加一層鋼筋網(wǎng)，然后澆筑補(bǔ)償縮短自防水砼。使結(jié)構(gòu)到達(dá)抗裂防滲的意圖，即處理防水問題。
The method is to cut off the original bridge deck pavement and linoleum, to wool the original bridge deck, add a layer of steel mesh with anchor rod in the thickness range of the original pavement, and then pour compensatory shortened self-waterproof concrete. To make the structure reach the purpose of crack resistance and seepage control, that is, to deal with waterproofing problems.
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