护坡桩就是沿基坑边打的防止边坡坍塌的桩，通常是在边坡放坡有效宽度工作面不够的情况下采用的措施，有了护坡桩可以防止临近的原有工程基础位移、下沉，有了护坡桩基坑放坡可以使坡比大化。那么护坡桩的施工工艺是怎样的？

The slope protection pile is a pile driven along the side of the foundation pit to prevent the slope collapse. It is usually a measure taken when the effective width of the slope grading is not enough. With the slope protection pile, the displacement and settlement of the adjacent original engineering foundation can be prevented. With the slope protection pile, the slope of the foundation pit can be increased. So what is the construction technology of slope protection pile?

采用循环钻机钻进成孔、钢筋笼现场加工和吊装、商砼运输施工现场、导管法灌注工艺进行施工,其施工工艺流程见下：

The construction process is as follows:

施工步骤

Construction steps

场地平整→测量放线→钻机就位→校正→钻进成孔→成孔验收→下入钢筋笼并对中固定→灌桩砼成桩。

Site leveling → surveying and setting out → drilling rig in place → correction → drilling and hole forming → hole forming acceptance → placing reinforcement cage and centering and fixing → pouring concrete into pile.

成孔

Porogenesis

钻机移动、就位。

Move and place the drilling rig.

对点、开钻，由当班技术员记录开钻时间，监理工程师见证。

The technician on duty shall record the spud-in time for the point and spud-in, which shall be witnessed by the supervising engineer.

钻进，钻进前钻机操作者调平钻机并使钻杆自然垂直于地面，当班技术人员使用吊线垂检查钻杆的垂直度。

Before drilling, the rig operator shall level the rig and make the drill pipe naturally perpendicular to the ground. The technician on duty shall check the verticality of the drill pipe with a plumb bob.

成孔达到设计深度时，要进行自检，经监理工程师验收合格后进入下一道工序施工。

When the hole reaches the design depth, self-inspection shall be carried out, and the next process shall be started after the acceptance of the supervising engineer.

钢筋笼制作及安装

Fabrication and installation of reinforcement cage

排钢筋：按钢筋下料单，将各种规格的钢筋排布就绪，电焊机准备就绪。

Arrangement of reinforcement: according to the reinforcement blanking list, the reinforcement of various specifications shall be arranged and the electric welding machine shall be ready.

焊接：主筋、加劲筋采用单面电弧搭接焊，螺旋筋采用梅花点焊连接。

Welding: the main reinforcement and stiffener are welded by single-sided arc lap welding, and the spiral reinforcement is connected by plum spot welding.

运输：钢筋笼采用吊车倒运，人力辅助的方式运输。

Transportation: The reinforcement cage is transported by crane and assisted by manpower.

吊装：钢筋笼采用吊车安装就位，钢筋笼周边设船型定位卡，保证混凝土保护层厚度。

Hoisting: the reinforcement cage shall be installed in place by crane, and a ship-type positioning card shall be set around the reinforcement cage to ensure the thickness of the concrete protective layer.

就位：钢筋笼就位时，三点起吊，应吊直扶稳，对准孔位，缓缓放下，不得碰撞孔壁，到达设计桩顶标高后将钢筋笼上缘用吊筋与孔口钢管固定。

In place: when the reinforcement cage is in place, it shall be lifted at three points, and it shall be lifted straight and stabilized, aligned with the hole position, and lowered slowly. It shall not collide with the hole wall. After reaching the design pile top elevation, the upper edge of the reinforcement cage shall be fixed with the steel pipe at the hole mouth with the hanging bar.

混凝土灌注

Concrete pouring

塌落度测量，采用高塌落度混凝土（180±20mm），导管法灌注砼成桩。

For slump measurement, high slump concrete (180 ± 20mm) is used, and concrete is poured into piles by tremie method.

试块制作，混凝土留置试块，每个灌注台班不得少于1组。

The test blocks shall be made and reserved for concrete. Each pouring machine shift shall not be less than one group.

导管安装，在桩孔内设置导管时，导管下端距孔底距离宜为300～500mm，采用Φ225导管，法兰盘连接，施工前导管应试拼、试压，保证整根导管顺直，不漏水、不破裂。

For the installation of tremie, when the tremie is set in the pile hole, the distance between the lower end of the tremie and the hole bottom should be 300~500mm Φ 225 conduit is connected with flange plate. Before construction, the conduit shall be tested for assembly and pressure to ensure that the whole conduit is straight, free from water leakage and crack.

混凝土灌注，灌注混凝土应连续进行，不得中断，并设专人随时测定孔内混凝土面上升高度，记录混凝土投入量，计算混凝土充盈系数。

Concrete pouring shall be carried out continuously without interruption, and a special person shall be assigned to measure the rising height of the concrete surface in the hole at any time, record the concrete input, and calculate the concrete filling coefficient.

由于周围场地条件或环境限制，不允许采取放坡法开挖深基坑时，一般都采用直立边坡支护结构的方法。常见的是采用护坡混凝土灌注桩，沿基坑边界组成挡墙，以此来支护基坑边坡，防止土体塌方。深基坑边坡采用护坡桩，不仅减少由于放坡增加的大量土方开挖量，节省施工场地占用面积，同时也确保周围建筑物在施工过程中的使用和。更多相关内容就来我们网站http://www.jnxltjc.com咨询吧！

Due to the surrounding site conditions or environmental constraints, when the slope method is not allowed to excavate deep foundation pit, the method of vertical slope support structure is generally adopted. It is common to use slope protection concrete cast-in-place piles to form retaining walls along the foundation pit boundary to support the foundation pit slope and prevent soil collapse. The slope protection pile is adopted for the slope of deep foundation pit, which not only reduces the amount of earthwork excavation increased due to slope grading, saves the area occupied by the construction site, but also ensures the use and safety of surrounding buildings in the construction process. Come to our website for more relevant content http://www.jnxltjc.com Ask!