**Abstract**

Bore pile foundation close heritage building should be no damage. Install the bore pile process had to perfect, nonporous concrete, no necking, no sliding soil, no mixed deep water, Objective the construction of bore pile near heritage buildings did not deformation and no crack. The case study methodology was surveying the process of the installation bore pile at the soft soil. Analyzing the results of the loading test, the process of installing bore piles with limited space, without damaging heritage buildings. Monitoring will determine the success of the bore pile structure, including a slight decrease in the water table in the area and outside the building site. The vibration drill equipment damped by the trench so that it was safe from cracks in the heirloom building. Monitor the mud content in the water that went out at bore done of soil, monitor concrete every 2 m depth of bore pile the volume of concrete the heirloom building was not damaged. Axial bore pile test, lateral test according to design.

**Keywords:** reduce vibration, trench, cut off the vibration waves, no crack in heritage building

## **1. Introduction**

Heritage buildings must be a true original, only cleaned and painted in a similar color, which should be taken care of when any construction was nearby. Heritage buildings could not change from the original, so that if the defect could not be like the original, Care must be taken to implement the three basement floors which are very close to the three heritage buildings with shallow foundations and high groundwater. In addition, the heritage building sits on 1.5 m fill soil. The fill soil and foundation shallow of the heritage building are very susceptible to ground active pressure, vibrations, and groundwater subsidence. The influence of the organic content on the compaction and consolidation characteristics of highly compressible organic clay (**Figures 1** and **2**) [1].

The 3-storey basement research building used a bore pile to a depth of 39 m, groundwater -1 m was removed from a pile hole with a diameter of 1.2 m and 1 m which needs to be monitored for the reduction in groundwater around the heritage building and the impact of large vibrations. The foundation strength followed on the soil layer type under the foundation [2].

The variation type soil and rainfall, the more difficult of structure.

**Figure 1.** *Three heritage buildings at research area.*

**Figure 2.** *Heritage research area.*

According to Suyono and Kazuto [3] the type of sub structure had to analysis include that's


*Bore Pile Foundation Construction without Caused Fine Cracks at Three Heritage Building DOI: http://dx.doi.org/10.5772/intechopen.98555*

h.Space was limited. Installed the reinforced concrete and casting


The bore pile has the highest bearing capacity and is the fastest way to support the load. Undoubtedly, the bored pile system has its advantages and disadvantages. This is the most important requirement of geotechnical engineering [4]. The advantages of drill foundation, install:


#### **2. Objective**

The construction of the bore pile near the heritage buildings, but the heritage buildings remain intact without slight cracks

#### **3. Methodology**

Case study, the author plans the work by paid watched to the site of limited area, 4 sides of heritage low building and old buildings with shallow foundations, the site attentions were carried out since preparing construction planning, observing vibrations, the impact of drilling machines, monitored the groundwater level, the bore pile processed, to the end of the hole in terms of quality water The concrete volume that enters the bore pile every 2 m was monitored according to the volume calculated based on the design drawing. Analyzing the results of the loading test based on the soil test. The dry drill construction was using an ordinary bore bit (spiral plate) that was rotated while being put into the ground using drill equipment and diesel power.

Axial load carrying capacity bore piles depend on the drilling method, concrete quality, concrete method, staff experience and soil conditions [5].

Bore pile construction were as follows:


Groundwater monitoring in the project area and at neighboring sites and the drilling process was observed water and soil.

To control the concrete volume of cast for every 2 m height of the cast, the diameter of the drill pile was 1 m and 1.2 m so that the bore pile was solid/not hollow so that the quality of the concrete was met.

#### **4. Result**

Heritage buildings, did not deform, no cracks, even fine cracks did not occur. This was because the vibration waves were suppressed, the groundwater around the heritage building was kept, not descending. The environment was protected from liquid waste, solid waste, and heritage buildings were closed, so they did not get dusty. The success of the heritage building as before, had not changed because of the vibration protection, fixed ground water level, heritage building dust protection. Bored piles are significant elements for foundation. Supervise the productivity, estimating cost and the time of the process construction [6].

#### **5. Discussion**

In bore pile construction things that must be considered were


*Bore Pile Foundation Construction without Caused Fine Cracks at Three Heritage Building DOI: http://dx.doi.org/10.5772/intechopen.98555*

The results showed that the method of bored pile was little complicated compared the concrete pile method. The concrete pile method was more effective and efficient than the bored pile method based on time and cost of the construction method [7].

The control did were:

a.Groundwater level was monitored every day. When groundwater falls quickly to fill, it was the fact that groundwater does not drop in the research location.

Installed 6-point holes for measuring groundwater subsidence (**Figure 3**). The development of the system has changed the conventional drill pile construction management, to improve efficiency and progress project information [8]. Control of the vibration by giving a sign to the heritage building had not changed. This was because a trench was made around the heritage building, so that the vibration waves were not continued.

A distance of upper-level A, length to B was measured every time, Length B difference each time indicated a drop in water ground. Distance A level with length B indicated C level. Difference peil C to peil D, it means water ground level drop.

Controlling of the dewatering hole 1: At times 15 o'clock shows length B was 6100 mm, tomorrow hours 15 showed B length was 6050 mm, groundwater 50 mm was dropped, so little did not affect the buildings at the site


**Figure 3.** *Water level ground measurement used multi meter tool in the (OW 1 until OW6) point.*

**Figure 4.** *Bore pile equipment.*


Researchers and construction managers are aware of rising and falling water level at hole, high water level in the study site

$$\mathbf{h} = \mathbf{z} + \mathbf{U} / \text{var} \tag{1}$$

h = height total pressure at one point. point z = elevation power at height. U = pore water pressure. Ɣw = water/unit weight.
