This page explains the trench/pit design options as well as offers examples to help designers take full advantage of the flexibility that GLD provides.

TRENCH/PIT LAYOUT

Overview:

Use this section to define the number of trenches and the trench characteristics. This system works equally well with both trenches and pits. In the case of a pit installation, think of each trench as a row of pipe in the pit and then define the row layout.

Nomenclature:

PIPE CONFIGURATION IN TRENCH/PIT

Overview:

Now that you have entered the general trench configuration (or row configuration, in the case of a pit installation), this section enables you to focus on defining the pipes in the trench/pit rows.

Nomenclature:

Configuration:
Function:

- one pipe per trench

- a single row in a pit system

- two pipes per trench
- three pipes per trench
- vertical slinky in trench

- horizontal slinky in trench

- single horizontal slinky row in pit system

Details for each configuration:

In this arrangement, the user creates a single column of pipes. The number of pipes chosen defines how many layers will be included. Each pipe is separated from its neighbor by the given vertical separation [Y], starting from the bottom of the trench. If the ‘Offset’ box is checked, each pipe layer will be shifted from the pipe layer below by the given horizontal separation [X]. Use this arrangement for pipe rows in a pit system.

In this arrangement, the user creates two-pipe layers. The number of pipes chosen defines how many layers will be included ( 2 , 4, 6, etc.). Each vertical layer is separated from the one above or below by the given vertical separation [Y]. If the ‘Offset’ box is checked, each pipe layer will be shifted from the pipe layer below by one-half the given horizontal separation [X/ 2 ].

In this arrangement, the user defines three pipe layers. The number of pipes chosen defines how many layers will be included (3, 6, 9, etc.). Each vertical layer is separated from the one above or below by the given vertical separation [Y]. If the ‘Offset’ box is checked, every layer will be shifted from the layer below by one-half the given horizontal separation [X/ 2 ].

In this arrangement, the slinky is placed vertically within a trench and is resting at the bottom. The trench may be as narrow as the pipe and soil allow.

In this arrangement, the slinky is placed horizontally at the bottom of the trench. The minimum trench width depends on the slinky diameter. Use this arrangement for slinky rows in a pit system.

EXAMPLES:

Pit System 1

The design calls for an 8 foot deep excavated pit with 6 rows of horizontal slinkies. The center-to-center distance/separation between slinky rows is 8 feet. Because the slinky diameter is 36 inches, the trench/row width is also 36 inches. Input data should look like this:

Pit System 2

The design calls for an 8 foot deep excavated pit with 6 rows of horizontal slinkies. The edge of one slinky row needs to be 8 feet away from the edge of the next slinky row (in Pit System 1, there is an 8 ft separation from center to center and in this example, there is an 8 ft separation between the edges of slinky rows. Input data should look like this:

Notice that in this case, the separation is 11 feet! This is because the separation (as defined by the program) measures the center-to-center distance between rows. However, the input specification we have in this example is distance between the edges of the slinkies in the rows. Since the slinky diameter is 36 inches, the slinky radius is 18 inches. From center to center, we therefore have 8 feet (as per the spec) + 18 inches (for the distance from the center of the slinky to the edge of the slinky) + 18 inches (for the distance from the center of the next slinky to the edge of the next slinky) = 8 feet + 36 inches = 11 feet.

Trench System 1

The design calls for 10 trenches that are 8 feet deep and that are separated from one another by 6 feet (6 feet separation from trench center to trench center). Two layers of double pipes will be placed in each trench. In each trench, the pipes will have a 12 inch horizontal separation and a 12 inch vertical separation. Each trench will be 12 inches wide. Input data should look like this:

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