阅读说明：本技术 一种用于深厚覆盖层的工作基点观测墩 (A work base observation mound for deep overburden ) 是由 张小清 明成涛 吴维兴 孟庆奕 于 2019-11-27 设计创作，主要内容包括：本发明提供了一种用于深厚覆盖层的工作基点观测墩,包括覆盖层；在覆盖层内浇筑有旋喷桩；所述旋喷桩内埋设有钢筋束,旋喷桩的一端插入基底,旋喷桩的另一端浇筑有沉降变形观测墩,沉降变形观测墩上浇筑有水平位移观测墩,沉降变形观测墩和水平位移观测墩形成观测墩；所述沉降变形观测墩的顶面直角出埋设有水准标志,水平位移观测墩的顶部中心埋设有强制对中基座。本发明通过将旋喷桩和钢筋束打入基岩或弱风化层等相对坚实稳定的地层中,减小了深厚覆盖层沉降对工作基点的影响,提高了工作基点的稳定性和可靠性,可作为施工期和运行期观测的工作基点,同时还兼具沉降变形观测工作基点和水平位移观测工作基点的作用。(The invention provides a working base point observation pier for a deep covering layer, which comprises a covering layer; a rotary jet grouting pile is poured in the covering layer; reinforcing steel bars are embedded in the jet grouting piles, one ends of the jet grouting piles are inserted into the substrate, sedimentation deformation observation piers are poured at the other ends of the jet grouting piles, horizontal displacement observation piers are poured on the sedimentation deformation observation piers, and the sedimentation deformation observation piers and the horizontal displacement observation piers form observation piers; a level mark is buried at a right angle of the top surface of the settlement deformation observation pier, and a forced centering base is buried at the center of the top of the horizontal displacement observation pier. The invention reduces the influence of deep covering layer sedimentation on the working base point by driving the jet grouting pile and the reinforcing steel bar into relatively solid and stable strata such as bedrock or a weakly weathered layer and the like, improves the stability and the reliability of the working base point, can be used as the working base point for observation in the construction period and the operation period, and simultaneously has the functions of observing the working base point in the sedimentation deformation and observing the working base point in the horizontal displacement.)

1. A foundation observation pier for deep overburden, comprising an overburden (8), characterized in that: a rotary jet grouting pile (1) is poured in the covering layer (8); reinforcing steel bundles (2) are embedded in the jet grouting piles (1), one ends of the jet grouting piles (1) are inserted into the substrate (9), and settlement deformation observation piers (3) are poured at the other ends of the jet grouting piles; the horizontal displacement observation pier (4) is poured on the settlement deformation observation pier (3), and the settlement deformation observation pier (3) and the horizontal displacement observation pier (4) form an observation pier; a level mark (6) is embedded at the right angle of the top surface of the settlement deformation observation pier (3), and a forced centering base (7) is embedded at the center of the top of the horizontal displacement observation pier (4).

2. The observation pier of claim 1, wherein: the reinforcing steel bar bundles (2) are buried in the center of the jet grouting pile (1).

3. The observation pier of claim 1, wherein: the substrate (9) is bedrock or a weak weathering layer.

4. The observation pier of claim 1, wherein: the jet grouting pile (1) is fixedly connected with the settlement deformation observation pier (3) through a dowel (5).

5. The observation pier of claim 1, wherein: one end of the jet grouting pile (1) is inserted into the base (9) to a depth of not less than 1m, and the other end of the jet grouting pile is located 0.2m below the ground (10).

6. The observation pier of claim 1, wherein: the settlement deformation observation pier (3) and the horizontal displacement observation pier (4) are poured into a whole through C20 concrete.

7. The observation pier of claim 1, wherein: distributed reinforcing steel bars (13) are embedded in the settlement deformation observation pier (3), and erection reinforcing steel bars (11) are embedded in the horizontal displacement observation pier (4); 4 erection steel bars (11) are arranged in the observation pier in a square shape; the erection steel bars (11) are connected and fixed through a plurality of stirrups (12); the distributed reinforcing steel bars (13) are uniformly distributed on the top surface of the settlement deformation observation pier (3).

8. The observation pier of claim 1, wherein: the central axes of the settlement deformation observation pier (3) and the horizontal displacement observation pier (4) are positioned on the sight line of the deformation observation point of the building.

9. The observation pier of claim 1, wherein: the settlement deformation observation pier (3) is a regular quadrangular prism, the horizontal displacement observation pier (4) is a regular quadrangular frustum pyramid, and the top surface of the settlement deformation observation pier (3) is 0.2m higher than the ground (10).

Technical Field

The invention relates to a working base point observation pier for a deep covering layer, and belongs to the technical field of safety monitoring.

Background

In the monitoring of horizontal displacement and settlement deformation of buildings, in order to ensure the stability and reliability of a working base point, the working base point is mostly arranged outside the deformation influence range of the buildings and on a relatively stable bedrock or a building foundation which is built for a long time. In practical application, a working base point is often buried in a region with flat terrain and a deep covering layer, and when no solid bedrock is available around a building under construction and the building is built for a long time, a base point observation pier capable of keeping stability in the deep covering layer is needed.

Disclosure of Invention

In order to solve the technical problems, the invention provides a working base point observation pier for a deep covering layer, which can effectively solve the problem of stability of the working base point on the deep covering layer.

The invention is realized by the following technical scheme.

The invention provides a working base point observation pier for a deep covering layer, which comprises a covering layer; a rotary jet grouting pile is poured in the covering layer; reinforcing steel bars are embedded in the jet grouting piles, one ends of the jet grouting piles are inserted into the substrate, sedimentation deformation observation piers are poured at the other ends of the jet grouting piles, horizontal displacement observation piers are poured on the sedimentation deformation observation piers, and the sedimentation deformation observation piers and the horizontal displacement observation piers form observation piers; a level mark is buried at a right angle of the top surface of the settlement deformation observation pier, and a forced centering base is buried in the center of the top of the horizontal displacement observation pier.

The reinforcing steel bar bundles are buried in the center of the jet grouting pile.

The substrate is bedrock or a weakly weathered layer.

And the rotary spraying pile is fixedly connected with the settlement deformation observation pier through the dowel bars.

One end of the jet grouting pile is inserted into the substrate to a depth of not less than 1m, and the other end of the jet grouting pile is located 0.2m below the ground.

The settlement deformation observation pier and the horizontal displacement observation pier are poured into a whole through C20 concrete.

Distributed steel bars are embedded in the settlement deformation observation pier, and erection steel bars and stirrups are embedded in the horizontal displacement observation pier; 4 erection steel bars are arranged in the observation pier in a square shape; the erection steel bars are connected and fixed through a plurality of stirrups; the distributed steel bars are uniformly distributed on the top surface of the settlement deformation observation pier.

The central axes of the settlement deformation observation pier and the horizontal displacement observation pier are positioned on the sight line of the deformation observation point of the building.

The settlement deformation observation pier is a regular quadrangular prism, the horizontal displacement observation pier is a regular quadrangular frustum pyramid, and the top surface of the settlement deformation observation pier is 0.2m higher than the ground.

The invention has the beneficial effects that: the jet grouting pile and the reinforcing steel bar bundle are driven into relatively solid and stable strata such as bedrock or a weakly weathered stratum, so that the influence of deep covering layer sedimentation on a working base point is reduced, the stability and the reliability of the working base point are improved, the jet grouting pile can be used as the working base point for observation in the construction period and the operation period, and simultaneously, the jet grouting pile and the reinforcing steel bar bundle have the functions of observing the working base point in the sedimentation deformation and observing the working base point in the horizontal displacement.

Drawings

FIG. 1 is a cross-sectional view of the present invention;

FIG. 2 is a top view of the present invention;

in the figure: the method comprises the following steps of 1-jet grouting pile, 2-tendon, 3-settlement deformation observation pier, 4-horizontal displacement observation pier, 5-dowel, 6-leveling mark, 7-forced centering base, 8-covering layer, 9-base, 10-ground, 11-erection steel bar, 12-stirrup and 13-distribution steel bar.

Detailed Description

The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.