Patent Description:
The present disclosure relates to concrete tanks for storing liquefied gases and, more particularly, to methods for manufacturing precast, prestressed concrete tanks for storing liquefied gases.

Many gases, such as methane, nitrogen, and natural gas, are stored at temperatures far below the usual ambient temperatures so that they may be kept in a liquid form. This permits large quantities of the gas to be stored in an otherwise limited volume of space. Such low temperature liquefied gases are usually not maintained at high pressure, but rather are maintained at about atmospheric pressure or under a relatively low pressure. Thus, the storage tank or facility need not be designed for great internal pressure.

Precast, prestressed concrete tanks are well-known for storage of liquefied gases, for example, as described in <CIT><CIT><CIT> and <CIT>. Typically, precast, prestressed concrete tanks have an inner wall defining a primary tank, and an outer wall defining a secondary tank. The outer wall is prestressed by an application of wire windings under tension around the outer wall. The inner wall is typically constructed of <NUM>% nickel steel or some other type of steel suitable for use at cryogenic temperatures. In some cases, the inner tank may also be precast, prestressed concrete.

During construction of precast, prestressed concrete tanks, when the outer wall is built first, the inner wall must either be inserted through an opening in the top of the tank, or by tunneling underneath the foundation to insert the inner wall from beneath the tank. However, these conventional construction practices for precast, prestressed concrete tanks are complicated and undesirable.

There is a continuing need for a precast, prestressed concrete tank and method that facilitates construction of a primary tank within a secondary tank. Desirably, the precast, prestressed concrete tank and method permits for the construction of the inner wall after the outer wall has been erected, but without requiring insertion through a top of the outer wall, or by tunneling underneath the outer wall.

The invention is a precast, prestressed concrete tank in accordance with claim <NUM> and a method for manufacturing a precast, prestressed concrete tank in accordance with claim <NUM>. In concordance with the instant disclosure, a precast, prestressed concrete tank and method that facilitates construction of a primary inner tank within a secondary outer tank, and which permits for the construction of the inner wall after the outer wall has been erected, but without requiring insertion through a top of the outer wall, or by tunneling underneath the outer wall, is surprisingly discovered.

In one embodiment, a precast, prestressed concrete tank includes a primary tank with an inner wall and a secondary tank with an outer wall (precast, prestressed concrete) and wire windings. The primary tank is disposed inside of the secondary tank. The secondary tank has a plurality of first precast outer wall panels, and a temporary construction opening frame. During assembly of the precast, prestressed concrete tank, the temporary construction opening frame defines an access doorway. The temporary construction opening frame is disposed on a foundation base slab and sealed.

In another embodiment, a precast, prestressed concrete tank includes a primary tank having an inner wall, and a secondary tank having an outer wall with wire windings. The primary tank is disposed inside of the secondary tank. The secondary tank includes a plurality of first precast outer wall panels, at least one second precast outer wall panel, and a temporary construction opening frame disposed on a foundation base slab. The temporary construction opening frame has a base section, a pair of column sections, and a header beam section. The temporary construction opening frame is disposed between a pair of the first precast outer wall panels and has two second precast outer wall panels disposed on top of the header beam section. Each of the second precast outer wall panels has a height shorter than a height of the first precast outer wall panels. The temporary construction opening frame has a plurality of clamps. The clamps affix the first wire windings to the temporary construction opening frame. The temporary construction opening frame is sealed with an inner plate, a first layer of shotcrete, an outer plate, and a second layer of shotcrete and further wrapped in an additional phase of wire windings.

In a further embodiment, a method for manufacturing a precast, prestressed concrete tank includes a provision of a plurality of first precast outer wall panels and at least one second precast outer wall panel. The at least one second precast outer wall panel is shorter than each of the first precast outer wall panels. A temporary construction opening frame is also provided. The temporary construction opening frame defines an access doorway and includes a plurality of clamps. The first precast outer wall panels, the at least one second precast outer wall panel, and the temporary construction opening frame are then assembled to provide a secondary tank assembly. The access doorway of the temporary construction opening frame provides access to an interior of the secondary tank assembly. A single phase of wire windings is then wound around at least a portion of the second tank assembly. The wire windings are clamped over the temporary construction opening frame with the clamps. The wire windings over the access doorway of the temporary construction opening frame are then cut, leaving the remainder of the wire windings held in place under tension by the clamps. A primary tank assembly is then assembled within the secondary tank assembly by delivery of components through the access doorway. The access doorway of the temporary construction opening frame is then sealed.

The above, as well as other advantages of the present disclosure, will become readily apparent to those skilled in the art from the following detailed description, particularly when considered in the light of the drawings described hereafter.

The following detailed description and appended drawings describe and illustrate various exemplary embodiments of the disclosure. The description and drawings serve to enable one skilled in the art to make and use the disclosure and are not intended to limit the scope of the disclosure in any manner.

In <FIG>, a precast, prestressed concrete tank <NUM> with a temporary construction opening frame <NUM>, according to various embodiments of the present disclosure, and a method <NUM> for manufacturing the precast, prestressed concrete tank <NUM>, are shown. The method <NUM> of assembly of the precast, prestressed concrete tank <NUM> is further illustrated in <FIG>, as described hereinafter.

As shown in <FIG>, <FIG>, and <FIG>, the tank <NUM> includes a primary tank <NUM> and a secondary tank <NUM>. The primary tank <NUM> is built inside of the secondary tank <NUM>. The primary tank has an inner wall (identified in <FIG> as "<NUM>"). The secondary tank <NUM> has an outer wall (identified in <FIG> as "<NUM>"). Referring to <FIG>, the tank <NUM> further includes a base <NUM>, described further herein, on which the inner wall <NUM> and the outer wall <NUM> are disposed.

In the embodiments shown in <FIG>, <FIG>, and <FIG>, the tank <NUM> has a cylindrical shape. However, other shapes for the tank <NUM> are contemplated and may also be selected by a skilled artisan within the scope of the present disclosure.

As shown in <FIG>, the secondary tank <NUM> includes a plurality of first precast outer wall panels <NUM>, a temporary construction opening frame <NUM>, at least one second precast outer wall panel <NUM>, and a dome <NUM>. The at least one second precast outer wall panel <NUM> may include a pair of the second precast outer wall panels <NUM>, for example, as shown in <FIG>. However, any other number of the at least one second precast outer wall panel <NUM> may also be employed.

The first precast outer wall panels <NUM> and the at least one second precast outer wall panel <NUM> may be fabricated from steel rebar reinforced concrete, as a non-limiting example. Other suitable materials and means for manufacturing the precast wall panels <NUM>, <NUM> may also be selected, as desired.

With reference to <FIG>, the at least one second precast outer wall panel <NUM> may have a height (H2) that is less than a height (H1) of the first precast outer wall panels <NUM>. This difference in the heights H1 and H2 permits the at least one second precast outer wall panel <NUM> to be placed atop the temporary construction opening frame <NUM> while maintaining upper edges of both the first precast outer wall panels <NUM> and the at least one second precast outer wall panel <NUM> flush or on substantially a same plane. This further permits the dome <NUM> to be disposed on top of the secondary tank <NUM> and affixed to the upper edges of both the first precast outer wall panels <NUM> and the at least one second precast outer wall panel <NUM>, for example, as shown in <FIG>.

In certain embodiments, each of the first precast outer wall panels <NUM> and the at least one second precast outer wall panel <NUM> may have a substantially rectangular side profile with a slightly arcuate cross section across a width of the panel <NUM>, <NUM>. Advantageously, the curvature of the first precast outer wall panels <NUM> and the at least one second precast outer wall panel <NUM> allows for multiple first precast outer wall panels <NUM> to form the cylindrical structure of the outer wall <NUM> of the secondary tank <NUM>, as depicted in <FIG>. The first precast outer wall panels <NUM> may also have a plurality of welding plates (not shown) formed into the concrete on each side of the panels <NUM>, <NUM>. These welding plates allow the panels to be welded together when forming the secondary tank <NUM>.

With renewed reference to <FIG>, the temporary construction opening frame <NUM> has a base section <NUM>, a pair of column sections <NUM>, and a header beam section <NUM>. The temporary construction opening frame <NUM> defines a temporary construction opening or access doorway <NUM>. The temporary construction opening frame <NUM> may be fabricated from <NUM>% Ni steel. However, one of ordinary skill in the art may also select other suitable materials for the temporary construction opening frame <NUM>, as desired.

In particular embodiments, each of has the base section <NUM>, the pair of column sections <NUM>, and the header beam section <NUM> of the temporary construction opening frame <NUM> may have hollow channels (not shown) that may be filled with high-strength grout during the construction thereof. The high strength grout is configured to both strengthen the temporary construction opening frame <NUM> and help integrate the temporary construction opening frame <NUM> with the panels <NUM>, <NUM>. In particular, the high-strength grout may be a non-shrink, non-bleed grout. The high-strength grout may be selected to have a compression strength at least equal to a compression strength of the concrete used to fabricate the panels <NUM>, <NUM> of the secondary tank <NUM>.

As shown in <FIG>, the temporary construction opening frame <NUM> may be integrally fabricated with, or otherwise securely affixed to, the base <NUM>. In exemplary embodiments, the base <NUM> includes the temporary construction opening frame <NUM>, a sketch plate <NUM>, a skirt plate <NUM>, and foundation base slab <NUM>. The base section <NUM> of the temporary construction opening frame <NUM> may be integral with the skirt plate <NUM>, for example. Other suitable means for connecting the temporary construction opening frame <NUM> to the base <NUM> of the tank <NUM>, including fasteners and welding, may also be employed within the scope of the disclosure.

With continued reference to <FIG>, the foundation base slab <NUM> may be a concrete slab. The foundation base slab <NUM> may have a thickness of about five feet, although other thicknesses are contemplated and may also be used. The foundation base slab <NUM> may further have seismic base cables (not shown) and sliding bearings (not shown) extending from the base slab <NUM> around the perimeter. A skilled artisan may also select other suitable construction parameters for the foundation base slab <NUM>, as desired.

In particular, the sketch plate <NUM> may be fabricated from <NUM>% Ni steel, although other suitable materials may also be used. The sketch plate <NUM> may be welded together around the entire perimeter beneath the eventual outer wall, with a "mirror-<NUM>" finished stainless steel plate epoxied to the underside of the sketch plate <NUM> and resting over the slide bearings.

Likewise, the skirt plate <NUM> may be fabricated from <NUM>% Ni steel or any other suitable material and welded together around the entire perimeter just outbound of the outer wall <NUM> and just inbound from the seismic base cables of the foundation base slab <NUM>. As disclosed, the base section <NUM> of the temporary construction opening frame <NUM> is integrally fabricated with the skirt plate <NUM>. The skirt plate <NUM> is welded to the sketch plate <NUM> to form a bottom corner of the outer wall <NUM> of the secondary tank <NUM>. The first precast outer wall panels <NUM> rest inside and abut the bottom corner defined by the sketch plate <NUM> and the skirt plate <NUM>.

As shown in <FIG>, the temporary construction opening frame <NUM>, as a nonlimiting example, may substitute for a lower portion of two of the first precast outer wall panels <NUM>. It should also be appreciated that the temporary construction opening frame <NUM> may also be sized to substitute for the lower portion of a single one of the first precast outer wall panel <NUM>, or lower portions of more than two precast of the first precast outer wall panels <NUM>, as desired.

During assembly, as also shown in <FIG>, one of the first precast outer wall panels <NUM> is disposed on a first side of the temporary construction opening frame <NUM>, and another of the first precast outer wall panels <NUM> is disposed on a second side of the temporary construction opening frame <NUM>. Then, the at least one second precast outer wall panel <NUM> is disposed on the header beam section <NUM> of the temporary construction opening frame <NUM>. The temporary construction opening frame <NUM> is thereby entirely bounded by the first precast outer wall panels <NUM> , the at least one second precast outer wall panel <NUM>, and the base <NUM> of the tank <NUM>.

With reference to <FIG>, the column sections <NUM> of the temporary construction opening frame <NUM> has a plurality of clamps <NUM>. The clamps <NUM>, may be welded to the temporary construction opening frame <NUM>, although other suitable means for securing affixing the clamps <NUM> to the column sections <NUM> may also be used.

In one non-limiting example, the clamps <NUM> may each have a pair of clamp bodies <NUM>, for example, as shown in <FIG>. The clamp bodies <NUM> may be connected by at least one threaded fastener <NUM> disposed through at least one threaded hole in the clamp bodies <NUM>. Each of the clamp bodies <NUM> may also have interior recesses adapted to receive wire windings (identified in <FIG> as "<NUM>") and to securely hold the wire windings <NUM> in operation. In a most particular example, each of the clamp bodies <NUM> is adapted to securely hold at least two of the wire windings <NUM>, as shown in <FIG>. One of ordinary skill in the art may also select other suitable clamping means for the clamps <NUM>, as desired.

During assembly, and as shown in <FIG>, the clamps <NUM> are used to affix free ends of a first phase of the wire windings <NUM>, and to securely hold the wire windings <NUM> under tension even when sections over the temporary construction opening <NUM> have been cut and removed (shown in <FIG> and <FIG>), as described further hereinbelow.

As shown in <FIG>, the temporary construction opening <NUM> is further sealed by a plate assembly <NUM> following the cutting and removing of sections of the first phase of wire windings <NUM> over the temporary constructions opening <NUM>, and also following the installation of the primary tank <NUM> as also described below. In a most particular embodiment, the plate assembly <NUM> may have four distinct layers, including: an inner plate <NUM>; a first application of shotcrete <NUM>; an outer plate <NUM>; and a second application of shotcrete <NUM>, as shown in <FIG>.

For example, the inner plate <NUM> may be fabricated from <NUM>% Ni steel and is configured to seal the temporary construction opening <NUM>. The inner plate <NUM> may be welded to the temporary construction opening frame <NUM>. The inner plate <NUM> may also have a plurality of vertical supports and at least one horizontal support. The various supports leave hollow channels across the surface of the inner plate <NUM>. The first application of shotcrete <NUM> of the plate assembly <NUM> may then be disposed on the hollow channels of the inner plate <NUM>.

The outer plate <NUM> may be fabricated from <NUM>% Ni steel and may likewise be configured to seal the temporary construction opening <NUM>. The outer plater <NUM> is disposed on the first application of shotcrete <NUM> and on the temporary construction opening frame <NUM> where the outer plate <NUM> is welded to the temporary construction opening frame <NUM>. The outer plate <NUM> may include two separate plates that are placed approximately parallel to one another. The plates may be welded to both the temporary construction opening frame <NUM> and the horizontal support of the inner plate <NUM>. The second application of shotcrete <NUM> is disposed on the outer plate <NUM>.

Where the plate assembly <NUM> has been installed to seal the temporary construction opening <NUM>, the plate assembly is further spaced apart from the inner wall <NUM> of the primary tank <NUM>, as also depicted in <FIG>. Advantageously, it has been found that this particular construction of the plate assembly <NUM> is of equal or greater strength relative to the remainder of the outer wall <NUM> associated with the secondary tank <NUM>. Furthermore, there is an additional phase of wire windings <NUM> disposed over top of the plate assembly <NUM> and the sealed temporary construction opening <NUM>, which further contributes to the desired strength of the plate assembly <NUM> in operation.

Following the application of the second or additional phase of wire windings <NUM>, the additional phase of wire windings may be further covered by shotcrete to thereby complete the constructions of the tank <NUM>, as shown in <FIG>.

The present disclosure further includes the method <NUM> for manufacturing the precast, prestressed concrete tank <NUM>, as shown in <FIG> and also detailed hereinbelow.

The method <NUM> includes a first step <NUM> of providing the plurality of first precast outer wall panels <NUM> and the at least one second precast outer wall panel <NUM>. As described, the at least one second precast outer wall panel <NUM> has the height (H2) that is shorter than the height (H1) of each of the first precast outer wall panels <NUM>. The temporary construction opening frame <NUM> may also have a height (H3), with a sum of the height (H2) and the height (H3) being roughly equal to the height (H1) in certain embodiments, as shown in <FIG>. The panels <NUM>, <NUM> may be provided by casting the panels <NUM>,<NUM> out of concrete with rebar inlays, as also described hereinabove.

The second step <NUM> of the method <NUM> includes providing the temporary construction opening frame <NUM>, as shown in <FIG>. The temporary construction opening frame <NUM> defines the access doorway <NUM> and including the plurality of clamps <NUM>. More specifically, the second step <NUM> of the method <NUM> includes laying the concrete base slab <NUM> and installing the seismic base cables and the sliding bearings. The sketch plate <NUM> and the skirt plate <NUM> are then installed on the foundation base slab <NUM>. Installation of the skirt plate <NUM> includes installation of the temporary construction opening frame <NUM>. The hollow channels of the temporary construction opening frame <NUM> are then filled with the aforementioned high-strength grout.

The method <NUM> then includes a third step <NUM> of assembling the first precast outer wall panels <NUM>, the at least one second precast outer wall panel <NUM>, and the temporary construction opening frame <NUM> to provide the outer wall <NUM> of the secondary tank <NUM>, as shown in <FIG>. It should be appreciated that, upon assembly under the third step <NUM>, the temporary construction opening frame <NUM> provides access to an interior of the secondary tank <NUM> via the opening or access doorway <NUM>.

This assembly under the third step <NUM> may include a lifting of the first precast outer wall panels <NUM> with a crane, and a setting the first precast outer wall panels <NUM> in place around the bottom corner of the base <NUM>. One of the first precast outer wall panels <NUM> is disposed on the first side of the temporary construction opening frame <NUM>, and another of the precast outer wall panels <NUM> is disposed on the second side of the temporary construction opening frame <NUM>. The at least one second precast outer wall panel <NUM> is then disposed on the header beam section <NUM> of the temporary construction opening frame <NUM>.

The individual first precast outer wall panels <NUM>, the second precast outer wall panels <NUM>, and the temporary construction opening frame <NUM> are subsequently welded together along their respective welding plates within the panels <NUM>, <NUM>. Shotcrete is then applied between the first precast outer wall panels <NUM>, the second precast outer wall panels <NUM>, and the temporary construction opening frame <NUM>. The shotcrete is also then applied to the entire outer wall <NUM> defined by the assembled panels <NUM>, <NUM>.

A fourth step <NUM> in the method <NUM> includes filling the temporary construction opening with a temporary backing <NUM>. Advantageously, the temporary backing <NUM> fills the temporary construction opening <NUM> during subsequent steps of the method <NUM>, which allows the secondary tank <NUM> to be prestressed with the first stage of wire windings <NUM>.

In particular, as depicted in <FIG>, the method <NUM> has a fifth step <NUM> that includes winding the first phase of wire windings <NUM> around at least a portion of the second tank assembly. This first phase of wire windings <NUM> passes through the recesses <NUM> of the clamps <NUM>. For example, the windings <NUM> may wrap the entire height H1 of the outer wall <NUM> of the secondary tank <NUM>. One skilled in the art may also select other suitable heights to which to wrap the windings <NUM> around the second tank <NUM>, as desired.

The sixth step <NUM> of the method <NUM> includes clamping the first phase of wire windings <NUM> over the temporary construction opening frame <NUM> and the temporary backing <NUM>. More specifically, the threaded fastener <NUM> of each of the clamps <NUM> may be tightened over associated ones of the wire windings <NUM>. The threaded fastener <NUM> pulls the clamp bodies <NUM> toward each other to cause the clamping action on the wire winding <NUM> when disposed in the recess <NUM> between the clamp bodies <NUM>. The wire windings <NUM> furthermore may be welded to the clamps <NUM> to further secure the wire windings <NUM> to the clamps <NUM>.

The method <NUM> has a seventh step <NUM> that includes cutting the first phase of wire windings <NUM> over the temporary construction opening <NUM> as defined by the temporary construction opening frame <NUM>. The remainder of the wire windings are held in place under the tension by the clamps <NUM>. As shown in <FIG>, the clamps affix otherwise free ends of the first phase of wire windings <NUM>, allowing the cut portions of the wire windings <NUM> to be removed so that the temporary backing <NUM> is exposed.

The eighth step <NUM> of the method <NUM> includes a removing of the temporary backing <NUM> from the temporary construction opening frame <NUM>. Advantageously, after the first phase of wire windings <NUM> have been cut, the temporary backing <NUM> may be removed to allow the assembly of the primary tank <NUM> though the temporary construction opening <NUM>. In particular, preformed wall portions of the primary tank <NUM> may be inserted through the opening or access doorway <NUM>. The dome <NUM> is fabricated concurrently with the installation of the secondary tank <NUM>. The dome may also be installed on top of the secondary tank <NUM> before the primary tank <NUM> is built within the secondary tank <NUM>, for example, as shown in <FIG>.

The method <NUM> further includes a ninth step <NUM> of assembling the primary tank <NUM> within the secondary tank <NUM> by delivery and installation of components through the temporary construction opening <NUM>. For this purpose, a ramp <NUM> may be built adjacent to the temporary construction opening <NUM> to facilitate the movement of equipment and components for the primary tank <NUM> inside the secondary tank <NUM>. The primary tank <NUM> is then assembled within the secondary tank <NUM> by delivery of the necessary components through the access doorway <NUM>.

Once the primary tank <NUM> is completed within the secondary tank <NUM>, a tenth step <NUM> of the method <NUM> includes a sealing of the access doorway <NUM> of the temporary construction opening frame <NUM>. The tenth step <NUM> of sealing the temporary construction opening <NUM> may specifically include a welding of the inner plate <NUM> to the temporary construction opening frame <NUM>. The temporary construction opening is then further sealed by the first application of shotcrete <NUM>. The outer plate <NUM> is then welded to the temporary construction opening frame <NUM> and the inner plate <NUM>. The second application of shotcrete <NUM> is then applied over the outer plate <NUM>. An exemplary construction of the plate assembly <NUM> is also described further hereinabove and shown in <FIG>.

The method <NUM> then includes an eleventh step <NUM> of winding additional phases of wire windings <NUM> around the secondary tank <NUM>, for example, as shown in <FIG>. More specifically, the eleventh step <NUM> may include a building out of the outer wall <NUM> with a mesh screen and further applications of shotcrete. The additional phase of wire windings <NUM> is then wrapped around the base of the secondary tank <NUM>. More specifically, the additional phase of wire windings <NUM> is wrapped around the base of the secondary tank <NUM> to at least the height (H3) of the temporary construction opening frame <NUM>, as shown in <FIG>. A final layer of shotcrete is subsequently applied to cover the additional phase of wire windings <NUM>. The ramp <NUM> is removed, and an access staircase is installed along the outer wall <NUM> of the secondary tank <NUM>.

A twelfth step <NUM> of the method <NUM> may include applying a final layer of shotcrete to the secondary tank <NUM>. Following this final application of shotcrete, the tank <NUM>, as shown in <FIG>, is completed.

Various materials and dimensions are described and shown in the drawings, for purposes of illustrating the illustrative embodiment. However, it should be appreciated that one of ordinary skill in the art may select other suitable materials and dimensions for the prestressed reinforced concrete tank <NUM> without departing from the scope of the present disclosure.

Advantageously, the temporary construction opening frame <NUM> of the precast, prestressed concrete tank <NUM> and related manufacturing method facilitates the manufacturing of the precast, prestressed concrete tank <NUM> without having to resort to tunneling through the bottom of, or lifting of the components through the top of, the secondary tank <NUM> when manufacturing the primary tank <NUM>.

More specifically, it should be understood that the components forming the primary tank <NUM> may be inserted through the temporary construction opening <NUM>, which is subsequently sealed so that the secondary tank <NUM> may be completed following the assembly of the primary tank <NUM>.

Claim 1:
A precast, prestressed concrete tank (<NUM>), comprising:
a primary tank (<NUM>) including an inner wall (<NUM>); and
a secondary tank (<NUM>) including an outer wall (<NUM>) having a plurality of first precast outer wall panels (<NUM>) and at least one second precast outer wall panel (<NUM>), the primary tank disposed inside of the secondary tank, and the secondary tank having a temporary construction opening frame (<NUM>) disposed on a base (<NUM>) for delivery of components of the primary tank through the temporary construction opening frame, the temporary construction opening frame having a base section (<NUM>), a pair of column sections (<NUM>), and a header beam section (<NUM>), the temporary construction opening frame defining a temporary construction opening (<NUM>) which is sealable by installation of a plate assembly (<NUM>) that is further spaced apart from the inner wall of the primary tank,
wherein the at least one second precast outer wall panel is disposed on top of the header beam section of the temporary construction opening frame,
wherein the secondary tank has at least two phases of wire windings (<NUM>), the two phases of wire windings including a first phase of wire windings and a second phase of wire windings, the first phase of wire windings having a first portion and a second portion, the first portion attached by clamps (<NUM>) to each of the pair of column sections and wound around only part of a perimeter of the secondary tank, and the second portion disposed above the pair of column sections and wound around an entirety of the perimeter of the secondary tank, and the second phase of wire windings wound around the entirety of the perimeter of the secondary tank over at least the first portion of the first phase of wire windings and disposed over a top of the plate assembly once installed to seal the temporary construction opening,
wherein the clamps are used to affix free ends of the first phase of the wire windings, and to securely hold said wire windings under tension even when sections of said wire windings over the temporary construction opening have been cut and removed during assembly,
wherein the temporary construction opening frame is disposed adjacent at least one of the first precast outer wall panels, and
wherein the at least one second precast outer wall panel has a height that is less than a height of each of the first precast outer wall panels.