施工现场高程控制网的测设

施工现场高程控制网的测设
2021年01月01日10:14:17 0 323

施工现场高程控制网的测设

 

为保证平面控制网的相对精度,按设计规定的红线桩点位置和红线边方向进行测量。根据不同的表面、工期、网形和精度要求,采用不同的测量方法,保证施工需要和精度要求。

根据定位条件,现场直接测量控制装置的定位。这样既保证了主楼轴线的定位精度,又使整个施工测量简单易行。

控制网经自检合格后,通知施工单位和监理单位对线路进行检查。接到合格通知后,方可正式使用,并采取切实措施保护桩位。

(1) 沿施工管线设置水准点和坐标点,并采取保护措施作为详细放样的依据。

(2) 当水准仪设置在场地的任何地方时,可以同时看到两个水准点以供使用。

(3) 全场各水准点高程经自检合格,并经有关技术部门和甲方检查合格后,方可正式使用,雨季前后应做好桩位保护和复测,确保高程的正确性。

3、 高程控制网的测量精度

根据已知场地高程控制网引测。测量完设计标高后,应将其附着在另一个指定的水准点上进行检查。闭合差应小于±5nmm(n为测站数)或±12mm√L(L为测线长度,单位KM),闭合差合格后,按测站数正比例分配。如果在现场附近的设计中只给出一个已知高程的水准点,则应采用往返测量法或闭合测量法进行检查。实际测量采用S3水准仪,视线长度不大于70m,注意前后视线等长,镜位及拐点应稳定,尽量使用塔尺


Survey and setting of elevation control network in construction site

Survey and setting of elevation control network in construction site

In order to ensure the relative accuracy of the horizontal control network, the survey is carried out according to the point position of a red line pile and the direction of a red line edge specified in the design. According to the different surface, construction period, net shape and accuracy requirements, different measurement methods are adopted to ensure the construction needs and accuracy requirements.

According to the positioning conditions, the positioning of the control is directly measured on site. In this way, the positioning accuracy of the axis of the main building is ensured, and the whole construction survey is simple and easy.

When the control network is measured and qualified by self inspection, the construction unit and the supervision unit shall be informed to inspect the line. After receiving the qualified notice, it can be formally used, and practical measures shall be taken to protect the pile position.

(1) Set bench marks and coordinate points along the construction pipeline, and take protective measures as the basis for detailed lofting.

(2) When the level is set anywhere in the site, two leveling points can be seen at the same time for use.

(3) The elevation of each benchmark in the whole site can be used formally only after passing the self inspection and the inspection by relevant technical departments and Party A. the pile position shall be properly protected and retested before and after the rainy season to ensure the correctness of the elevation.

3、 Survey precision of elevation control network

The site elevation control network shall lead the survey to the site according to the designated bench mark with known elevation. After the design elevation is measured, it shall be attached and checked to another designated bench mark. The closure error shall be less than ± 5nmm (n is the number of survey stations) or ± 12mm √ L (L is the length of survey line, in KM) After the closure error is qualified, it shall be distributed in a positive proportion according to the number of stations. If only one bench mark with known elevation is given in the design near the site, the round-trip survey method or closed survey method shall be used for checking. S3 level is used in the actual measurement, the length of line of sight is not more than 70m, and attention should be paid to the equal length of front and rear line of sight, the mirror position and turning point should be stable, and the tower ruler should be used as far as possible


施工场地标高控制网的测设

 

 

施工场地标高控制网的测设

为保证平面控制网的相对精度,以设计指定的一个红线桩的点位和一条红线边的方向为准进行测设。根据场面、工期、网形及精度要求的不同,采取不同的测法,以保证施工需要及精度要求。

根据定位条件,在现场直接测定控制的定位。定出平面控制网,这样一步一校核测法保证了主体建筑物轴线的定位精度度,也使整个施工测工作简便易行。

当控制网测定并经自检合格后,通知建设单位、监理单位验线,在收到验线合格通知后,方可正式使用,并采用切实措施保护好桩位。

(1)沿施工管线沿线设置水准点及坐标点,并采取保护措施,作为细部放样依据。

(2)在场地内任何地方安置水准仪时,都能同时后视到二个水准点,以便使用。

(3)整个场地内各水准点标高经自检及有关技术部门和甲方检测合格后,方可正式使用,桩位采取妥善保护,并在雨季前后各复测一次,以保证标高的正确性。

三、标高控制网测设精度

场地标高控制网根据指定的已知标高的水准点引测到场地内,测出设计高程后,到另一指定的水准点做附合校对,闭合差应小于±5nmm(n为测站数)或 ±12mm √L(L 为测线长度,以km 为单位),闭合差合格后,按测站数成正比例地分配,如果场地附近设计方面只给出一个已知标高的水准点时,应用往返测法或闭合测法进行校核。实测时用S3 型水准仪,视线长度不大于70m,且要注意前后视线等长,镜位与转点均要稳定,使用塔尺时,要尽量不抽

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