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隧道排水沟电缆槽施工技术交底

Construction technical bottom of cable groove in tunnel drainage ditch

一、设计参数

1. Design parameters

苏澳隧道全长1861米，起讫里程：DK78+805～DK76+944。隧道双侧设置沟槽，按一沟两槽形式布置，隧道中线处设置中心水沟。沟槽身均采用C30钢筋砼。侧沟：30cm宽×80cm高。电力电缆沟（布置在靠边墙侧）:20cm宽×36cm高。通信信号电缆槽(布置在靠线路中线侧):35cm宽×36cm高。中心水沟：60cm宽×85cm高。

The Suao tunnel is 1861 meters long and has a mileage of DK78+805 to DK76+944. Both sides of the tunnel are provided with grooves, arranged in one groove and two troughs, and a central ditch is arranged at the middle line of the tunnel. C30 reinforced concrete is used in the grooves. Lateral sulcus: 30cm wide x 80cm high. Power cable trench (arranged on side wall side): 20cm wide * 36cm high. Communication signal cable slot (arranged on the middle line side): 35cm width * 36cm high. Central ditch: 60cm wide x 85CM high.

二、工艺流程

Two. Process flow

水沟电缆槽施工采用分段施工，分段施工不宜过短且保证线型顺直，考虑沟槽在温度作用下的伸缩变形影响及水沟电缆槽模板台车长度，分段长度为12m。模板采用整体移动式钢模板，一次立模浇筑成型，当沟槽混凝土强度不小于5MPa时，即可进入下一段施工。电缆沟盖板、排水沟盖板采用工厂化集中加工运输至现场。

The construction of the trench cable groove is subsection construction, the subsection construction should not be too short and the line type is smooth and straight, the expansion and deformation of the groove under the effect of temperature and the length of the trench of the cable groove template table car are considered, and the length of the section is 12m. The formwork adopts integral mobile steel formwork, which is poured by a vertical mould. When the strength of the trench concrete is not less than 5MPa, it can enter the next stage of construction. The cover of the cable trench and the drain cover are transported to the site by factory centralized processing.

2.1.施工准备

2.1. construction preparation

2.1.1.综合接地电阻测试

2.1.1. integrated grounding resistance test

在施工水沟电缆槽之前要对综合接地钢筋的电阻进行测试，电阻小于等于1Ω为合格，合格方可进行水沟电缆槽施工。

The resistance of the integrated grounding bar should be tested before the construction of the trench cable slot. The resistance is less than 1 Omega, and the qualified side can carry out the construction of the channel cable groove.

2.1.2.测量放线

2.1.2. measuring discharge line

水沟电缆槽尺寸及相对位置、纵向坡度，要严格按施工图由测量员精确放样电缆槽平面定位基准线和标高基准线。

The size and relative position and longitudinal gradient of the cable trench shall be strictly measured by the surveyors according to the construction plan, and the datum line and elevation base line of the cable trough plane shall be accurately laid out.

2.1.3.凿毛

2.1.3. chisel

为了保证施工质量，在电缆槽施工前，采用风镐将两侧矮边墙与电缆槽结合面、沟槽身与填充结合面，做凿毛处理，以保证后施工的电缆槽与矮边墙粘结牢固，不产生裂缝或脱落。

In order to guarantee the quality of the construction, before the construction of the cable trough, the wind pick is used to combine the side of the low side wall with the cable groove, the groove body and the filling surface, so as to make the hair treatment to ensure that the cable groove in the post construction is firmly bonded to the low side wall and does not produce cracks or shedding.

2.1.4.基底清理、冲洗

2.1.4. base cleaning and washing

边墙结合面凿毛后，将水沟和电缆槽基底的松碴、杂物、淤泥清理，并用高压水凿毛后边墙结合面和基底冲洗干净。

After the edge wall is chiseled, it will clean the ballast, sundries and silt in the basement of the ditch and cable trough, and rinse it with the surface and the base with the wall of the high pressure water chisel.

2.2.施工工艺

2.2. construction technology

2.2.1.过轨管线连接

2.2.1. crossing pipeline connection

(1) 信号专业过轨管线和无线通信专业管线弯曲通入通信电缆槽内，电力专业过轨管线弯曲通入电力电缆槽内。

(1) the signal professional crossing pipeline and wireless communication professional pipeline is bent into the communication cable slot, and the power professional rail crossing pipe is bent into the power cable slot.

(2) 各过轨管线管口均要求打磨光滑保护电缆，并在电缆槽露头1cm，管口应设堵头，采用冷封胶封堵以防渗水。

(2) all pipeline crossing pipes require polished smooth protective cables, and 1cm should be installed at the outlet of the cable trench. The plugs should be installed at the ends of the pipes and sealed by cold sealing to prevent seepage.

2.2.2.钢筋绑扎

2.2.2. reinforcing bar binding

(1)外侧的通信信号电缆槽侧壁配有单层钢筋，主筋为Φ12钢筋，单根长1.341m，纵向间距25cm，用冲击钻在填充面钻孔，孔深不小于30cm；纵向分布筋:Φ16钢筋，间距25cm。

(1) the lateral wall of the communication signal cable is equipped with a single layer steel bar, the main reinforcement is 12 steel, the single long 1.341m, the longitudinal spacing of 25cm, drilling in the filling surface with the impact drilling, the hole depth is not less than 30cm; the longitudinal distribution rib: 16 steel bar and the distance 25cm.

(2)通信信号电缆槽混凝土浇筑时预埋Φ8电缆槽分隔钢筋，L=40cm，预埋20cm外露20cm，纵向间距50cm。

(2) when the communication signal cable trays are concreted, the embedded 8 L=40cm cable trays are used to separate the reinforcing bars, and the embedded 20cm is exposed to 20cm, and the longitudinal spacing is 50cm.

(3)钢筋安装详见图1：侧沟及电缆槽详图。

(3) Installation of reinforcing bars is shown in Fig. 1: Detailed drawings of side grooves and cable grooves.

2.2.3.综合接地

2.2.3. integrated grounding

(1)通信电缆槽侧墙上部Φ16纵向钢筋作为纵向接地钢筋，初期支护、二衬、仰拱、综合洞室引出的接地钢筋要与通信电缆槽侧墙上部Φ16钢筋间采用直径16mm的“L”形钢筋进行焊接（见下图2：L”形焊接），单面焊接不小于16cm（10倍钢筋直径），焊缝应饱满并敲除焊渣，侧墙Φ16纵向接地钢筋每100m断开一次，断开的钢筋端头间距不小于10cm。

(1) the 16 longitudinal reinforcement of the wall in the wall of the communication cable slot is used as the longitudinal grounding bar, and the earthing reinforcement of the initial support, the two lining, the inverted arch and the comprehensive cavern should be welded with the "L" shaped bar of 16mm diameter between the diameter of the steel bar in the wall of the communication cable slot (see figure 2:L "shape welding), and the single side welding is not less than 16cm (10). The weld should be full and knock out the welding slag. The side wall 16 100m longitudinal connection will be cut off once every time. The distance between the ends of the broken reinforcement will not be less than 10cm.

2.2.4.接地端子布置

2.2.4. grounding terminal layout

从隧道进口端2m处开始，在两侧通信信号电缆槽底部，每间隔100m设置一个接地端子，小于100m的隧道在中部设一处；

Starting from the entrance of the tunnel at the entrance of 2m, a ground terminal is set at the bottom of the communication signal cable trough on both sides, and a tunnel at each interval of 100m is set in the middle of the tunnel in the middle of the tunnel less than 100m.

从隧道进口端2m处开始，在两侧通信信号电缆槽靠线路侧壁上及其靠近侧沟的内壁上，每间隔50m设置一个接地端子，小于50m的隧道在中部设一处；

Starting from the entrance of the tunnel at the entrance of 2m, the channel on both sides of the communication signal cable is on the side wall of the line and on the inner wall near the side ditch. A grounding terminal is set at each interval of 50m, and a tunnel less than 50m is set in the middle of the tunnel.

上述所有的接地端子均通过Φ16钢筋与通信电缆槽侧墙上部Φ16纵向钢筋连接，焊接质量同接地钢筋，保证焊接质量。详见图3：接地端子设置示意图。

All of the above grounding terminals are connected with the diameter of 16 longitudinal steel bars in the wall of the channel side of the communication cable. The welding quality is the same with the ground reinforcement, and the welding quality is guaranteed. See Figure 3: a schematic diagram for the grounding terminal.

现场技术人员将隧道需要预埋接地端子的里程及个数在二衬上做好标记，以防漏埋。

The technicians at the scene mark the mileage and number of the buried earthing terminals in the tunnel on the two liners to prevent leakage.

2.2.5.排水管及泄水槽

2.2.5. drainage pipe and discharge tank

(1)两侧仰拱边墙预留的Φ100盲管、Φ50盲管全部接到两侧水沟，采用Φ100排水管，排水管在混凝土施工前安装，定位牢固，孔口采用土工布封堵，防止浇筑混凝土时泄水管跑位或混凝土灌入孔内。具体安装严格参照图1：侧沟及电缆槽详图。

(1) the 100 blind pipes and 50 blind pipes, which are retained by the side wall of the two sides of the inverted arch, are all connected to the two sides of the ditch. The drainage pipe is installed with a diameter of 100 drains. The drainage pipe is installed before the concrete construction, the positioning is firm and the hole is sealed with the geotextile to prevent the running of the pipe or the concrete into the hole. Specific installation is strictly referenced to figure 1: side ditch and cable trough detail.

(2)两侧沟与中心沟通过横向Φ100PVC排水管并采用Φ100异形弯头连接，横向排水管纵向间距30m。

(2) the side grooves and the central grooves pass through the transverse 100PVC drain pipe and are connected with the 100 diameter special elbow, and the vertical distance between the transverse drains is 30m.

(3)电力电缆槽、通信信号电缆槽与侧沟间墙底的泄水槽采用Φ20PVC管相连通，纵向间距3～５m，泄水槽尺寸见图1：侧沟及电缆槽详图。

(3) the power cable trough, the communication signal cable slot and the bottom wall of the side ditch are connected by the 20PVC tube, the longitudinal distance is 3 to 5m, the discharge groove size is shown in Figure 1: the detail drawing of the side ditch and the cable groove.

2.2.6.模板安装

2.2.6. template installation

根据测量放线，放出模板定位安装边线，然后安装模板，模板安装必须垂直，模板与模板之间的缝隙必须控制在2mm以内，基底不平整部位在关好模板后用砂浆封堵，防止浇注混凝土时漏浆，模板与模板之间不能有错台。为防止浇注混凝土时模板上浮和跑模，影响混凝土施工和浇注质量，沿模板底在基底纵向每2米打设φ22的固定钢筋，用铁丝加固牢固。模板每次安装前必须清除板面混凝土块，涂抹脱模剂。模板在搬运过程中必须轻拿轻放，防止模板变形，特别是定型钢模板。

According to the measurement and discharge line, the template is located and installed the border line, and then the template is installed. The template installation must be vertical. The gap between the template and the template must be controlled within 2mm. The uneven parts of the substrate are blocked with mortar after closing the template, so that the slurry is prevented from pouring concrete, and there can be no wrong platform between the template and the template. In order to prevent the floatation and running mould of the formwork, the quality of the concrete construction and pouring is affected. The fixed steel bar of 22 is set at the bottom of the template at the bottom of the base, and the steel wire is strengthened by wire. The template must be cleaned before the installation of the concrete block, and the mold release agent is applied. The template must be handled gently in the handling process to prevent deformation of the formwork, especially the formwork.

2.2.7.混凝土施工

2.2.7. concrete construction

电缆槽身混凝土为C30砼，施工中采用一次立模浇注成型。由于电缆槽

The concrete of the cable trench body is C30 concrete. Cable slot