保定巨盛模具制造有限公司

检查井通病原因分析

Analysis of common causes of inspection wells

1.1施工工艺所致

1.1 due to construction technology

施工工艺是检查井质量控制消除病害的关键环节，施工质量的优劣直接影响着检查井的使用效果。其原因主要存在以下三个方面

Construction technology is the key link of quality control and disease elimination of inspection wells. The quality of construction directly affects the use effect of inspection wells. The main reasons lie in the following three aspects.

(1) 检查井地基承载力不够。路面上的重力动荷载是通过检查井的井盖传至检查井井体，再通过井体垂直作用于地基上，即路面检查井上的车荷载最终是作用在检查井地基上的。这就要求检查井地基的承载力必须达到一定的强度，否则在上部长时间动荷载的作用下 ，地基土就会被压缩下沉，致使检查井整体下沉 ，检查井出现凹陷，路面不平整

(1) the bearing capacity of the inspection well foundation is not enough. The gravity dynamic load on the road surface is transmitted to the inspection well by the cover of the inspection well, and then acts on the foundation vertically through the well, that is, the vehicle load on the inspection well is ultimately acted on the foundation of the inspection well. This requires that the bearing capacity of the foundation of the inspection well must reach a certain strength, otherwise, under the action of long-term dynamic load, the foundation soil will be compressed and subsided, resulting in the overall subsidence of the inspection well, the inspection well depression, road surface irregularity.

(2) 压实度不达标。路面结构与检查井的刚度相差大，存在刚性与柔性转换问题。保证井周回填土压实度至关重要。根据《给水排水工程构筑物施工及验收规范》(G B5014 1—2008) ，检查井周围回填土的压实度应当与道路基层压实度相同，即压实度应大于等于 95 ％(重型压实标准 )，但在井施工过程中普遍做法是在井筒砌筑完成后，井与工作坑之间距离狭小，导致机械碾压困难 ，一般绕

(2) compaction degree is not up to standard. There is a big difference between the stiffness of the pavement structure and the inspection shaft, and there is a problem of rigidity and flexibility conversion. It is very important to ensure the compactness of backfill. According to the Code for Construction and Acceptance of Water Supply and Drainage Engineering Structures (GB 50141-2008), the compactness of the backfill around the inspection well should be the same as that of the road base, that is, the compactness should be greater than or equal to 95% (heavy-duty compaction standard). However, the common practice in the construction of wells is to lay wells and work pits after the completion of the construction. The distance between them is narrow, resulting in difficulty in mechanical rolling and general winding.

过井一定距离碾压；而人工夯实又难 以控制质量，从而导致井周回填土在使用过程中逐渐沉降，引起井周路面下沉，检查井四周开裂。

It is difficult to control the quality of artificial compaction, which leads to the gradual settlement of backfill around wells in the course of use, resulting in the subsidence of the road surface around wells and the cracking around the inspection wells.

(3) 施工时高程控制不严格及施工工期的压缩。很多施工单位都是在道路侧石砌筑完成后，参照侧石的标高确定井盖的标高。忽略了道路的横向坡度，使井盖标高和道路设计标高不协调，检查井盖高出或低于路面，在使用过程中受到车辆荷载冲击作用后会加剧井盖与井周路面的不均匀沉降

(3) the height control is not strict during construction and the construction period is compressed. Many construction units are in the road side stone masonry after the completion of reference to the side stone elevation to determine the well cover elevation. Ignoring the lateral gradient of the road, making the well cover elevation and road design elevation inconsistent, checking that the well cover is higher or lower than the road surface, will aggravate the uneven settlement of the well cover and the road surface around the well after being subjected to the impact of vehicle loads during use.

(4) 市政道路行业的施工工期压缩也是造成检查井病害的一

(4) construction period compression of municipal road industry is also one of the diseases causing inspection wells.

个不容忽视的原因。混凝土达到设计强度所需时间都在 28d 以上，若工期安排不合理，在混凝土强度还未形成前就进行碾压，极易造成施工期间的破坏；另一方面养护时间达不到要求，施工单位为避免重夯造成井身变形 ，不敢对井周回填土进行较强夯实。

One can not be ignored. The time required for the concrete to reach the design strength is more than 28 days. If the schedule is not reasonable, the concrete will be rolled before the concrete strength is formed, which will easily cause damage during construction. On the other hand, the maintenance time can not meet the requirements. In order to avoid the deformation of the shaft caused by heavy tamping, the construction unit dare not compare the backfill around the well. Strong tamping.

1.2检查井支座松动，井周路面沥青面层开裂。新晋祠路开井后发现，多数该类检查井井筒完好，井盖和支座均出现了松动，支座下的座浆和井内抹面出现不同程度的脱落。

1.2 the bearing of the inspection well is loose, and the asphalt pavement surface cracks on the well side. It was found that most of these inspection wells were in good condition, the cover and support were loosened, and the slurry under the support and the wiping surface of the wells fell off in varying degrees.