panel wall installation

8/2/2019 Panel Wall Installation

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T & B S T R U C T U R A L S Y S T E M S , L L C E N G I N E E R E D S T R U C T U R E S

MECHANICALLYSTABILIZEDEARTHSTRUCTURES

SEGMENTALCONCRETEPANEL

Installation Guide


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I N S T A L L A T I O N G U I D E

T&BSTRUCTURAL SYSTEMS LLCInstallation Guide

E N G I N E E R E D S T R U C T U R E S tpt (07/20/06)

I I

Installation Guide

T&B STRUCTURAL SYSTEMS, LLC6800 Manhattan Blvd. Suite 304

Ft. Worth, Texas 760120

Phone 888.280.9858 Fax 817.507.0197

Copyright TBSSALL RIGHTS RESERVED 2006

PROPRIETARY INFORMATION OF T&B STRUCTURAL SYSTEMS LLC.NO DISTRIBUTION IS ALLOWED WITHOUT WRITTEN PERMISSION FROM

T&B STRUCTURAL SYSTEMS LLC

The information set forth in this product submittal, including but not limited to all technical andengineering data, figures, tables, designs, drawings, details, procedures and specifications are intendedfor general information only. Every effort has been made to ensure their accuracy. This informationshould not be used or relied on for any application without independent verification from a ProfessionalEngineer. Anyone making use of this information does so at their risk and assumes any and all liabilityresulting from such use.


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1 INTRODUCTION.............................................................................................................................1 2 TERMINOLOGY..............................................................................................................................2 3 SITE PREPARATION .....................................................................................................................34 CONSTRUCTION ...........................................................................................................................4

4.1 PANEL PLACEMENT ..............................................................................................................54.2 BACKFILL PLACEMENT .........................................................................................................64.3 SOIL REINFORCEMENT PLACEMENT .................................................................................74.4 OBSTRUCTIONS.....................................................................................................................9 4.5 DRAINAGE ..............................................................................................................................94.6 FINISH GRADE PLACEMENT ..............................................................................................104.7 COPING PLACEMENT.......................................................................................................... 10

5 TYPICAL WALL COMPONENTS.................................................................................................126 ERECTION SEQUENCE...............................................................................................................13

6.1

STEP ONE .............................................................................................................................13

6.2 STEP TWO ............................................................................................................................146.3 STEP THREE.........................................................................................................................156.4 STEP FOUR...........................................................................................................................166.5 STEP FIVE.............................................................................................................................176.6 STEP 6................................................................................................................................... 186.7 STEP 7................................................................................................................................... 196.8 FILTER FABRIC PLACEMENT .............................................................................................206.9 PANEL LIFTING.....................................................................................................................21

7 MSE CHECK LIST ........................................................................................................................ 23


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1 INTRODUCTION

This manual is part of the contract documents. It is designed to provide a set of generalguidelines and specifications for the owner, contractor and erector of the TBSS SegmentalConcrete Panel retaining wall system. This manual shall be read and followed.

STANDARD MSE SECTION

Mechanically stabilized earth is a composite structure consisting of concrete, steel and soil.The inclusion of tensile resisting steel elements in the soil significantly improves the strengthof the soil. This unique combination, when designed and installed properly, will create a costeffective integrated retaining structure.


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TBSS shall supply a qualified Technical Adviser to assist the contractor in the beginning ofconstruction and periodic monitoring during the construction process. Both parties, beforecommencement of the installation must agree to additional technical advisement in writing.

The contractor shall be responsible for assuring that all required material is on site and isproperly stored as outline herewith. Further, the contractor is responsible for the proper

erection of the structure. The contractor and the contractors agents are responsible forassuring the structure is being constructed to the lines, offsets, and elevations as outlined inthe contract documents.

2 TERMINOLOGYAlignment Pin - A non-structural dowel that is placed in successive layers of panels in orderto maintain proper alignment during erection.

Bearing Pad - A neoprene pad that is placed at the location of the alignment pin at each pre-cast element. Prevents concrete-to-concrete contact and concrete spalling.

Connection Pin - A structural steel pin that joins the soil reinforcement to the panel anchor.

Coping - A concrete element that is used as the top of wall treatment. Can be either pre-castor cast-in-place.

Coping Panel - A special height panel that is placed at the top of the wall prior to placementof the coping unit

Face Of Wall The front face of the panel.

Facing Element - A pre-cast concrete panel that is connected to the soil reinforcement andprevents the raveling of soil between the layers of soil reinforcement.

Filter Fabric - A needle punched geo-textile fabric that is placed over the horizontal andvertical joints of each concrete panel. Keeps the soil from eroding out of the joints.

Finish Grade - The material that is placed in front of the MSE wall that protects the bottom ofthe wall from erosion and undercutting.

Geocomposite - A combination of geo-textile and plastic that forms a composite fabric that isused in lieu of the filter fabric for specific applications.

Hardwood Shim - Wedge shaped wood element that is used to correct panel orientation andto keep joints horizontally.

Inclusion - Any man made element that is inserted into the soil mass so as to improve thestructural properties of the soil.

Junction Slab - Reinforced concrete slab that is placed behind and structurally attached tothe coping element. Prevents the coping element from being dislodge from the wall duringtraffic impact. Sometimes referred to as a moment slab.

Level-Up Concrete - A non-reinforced grout that is placed on the top panel and leveled inorder to give the coping a smooth and level surface to bear on. Brings top of wall to correctelevation and orientation.


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Leveling Course - A non-structural, non-reinforced concrete element that the first row ofpanels is placed on. Brings bottom of wall to correct elevation and orientation.

Mechanically Stabilized Earth (MSE) - Engineering term for the stabilization of earththrough the use of soil inclusions.

Moment Slab - Reinforced concrete slab that is placed behind and structurally attached tothe coping element. Prevents the coping element from being dislodge from the wall duringtraffic impact. Sometimes referred to as a junction slab.

Panel Anchor - A protruding element that is cast directly into the back face of the panel andthat the soil reinforcement is attached to.

Prepared Foundation - The excavated and proofed rolled area that the reinforced volumebears on.

Reinforced Soil - A composite structure composed of alternating layers of soil andinclusions.

Retained Fill - The backfill material that is placed directly behind the reinforced soil volume.Usually consists of normal highway embankment material.

Select Fill - The volume of soil that is placed within the reinforced soil.

Soil Reinforcement - A manufactured welded wire grid element or inclusion that is placed inthe select backfill and that is structurally attached to the back face of the facing element.

Traffic Barrier - A structural element that retains traffic impact and directs the impact in adesired direction. Typically structurally attached to the coping element.

3 SITE PREPARATION

The foundation area shall be graded level for a width equal to the length of the soil

reinforcement, plus six (6) inches. All foundation material that is suspected of being of poorquality shall be removed and replaced. The foundation preparation is the critical part of thewall construction. Taking time to properly prepare the foundation will definitely decrease thechances of problems occurring during or after construction. Soil reinforcement shall not beplaced until the foundation has been prepared so it is capable of supporting all anticipatedloading.


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Once the foundation is properly prepared the non-reinforced leveling pad shall beformed and the concrete placed. Excavate and form the leveling course so that thetop of the leveling course is at the desired elevation. The leveling course will have a

minimum thickness of 6 inches. Compact the excavated leveling course foundationarea before placing the concrete. The leveling pad shall be allowed to cure aminimum of 24 hours before placement of the first row of panels. The leveling padmust be placed in the proper vertical and horizontal position as detailed on the plans.Experience has shown that improper placement of the leveling pad increases thechance for an unsatisfactory finished product.

4 CONSTRUCTION

The construction of the Mechanical Stabilized Earth Structure is a repetitive processthat requires successive layers of soil, panels and inclusions. Each constructedlayer requires the same installation steps and requires the same standard material.The only difference between each layer will be the size, spacing and configuration ofthe inclusions.


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In order to speed erection it is highly recommended that the erector be familiar withthe location and type of each of the material components that form the wall structure,and where each component is stored on site.

4.1 PANEL PLACEMENT

Each panel is labeled and detailed on the panel schedule or on the standard paneldetail sheet. Each panel is labeled with a panel type, number of panel anchors perrow of soil reinforcing, and the type of soil reinforcing element.

Elevation Retaining Wall

The five foot tall panel requires two rows of soil reinforcement. The soil reinforcingtype is given as a single numerical number and is situated at the top and bottom ofthe panel attribute label. The panel designator is typically an alphanumeric, followedby a numeric number, for special panels.

This alphanumeric designator when correlated to the panel schedule gives the paneldimensions. The number following the panel designator gives the number of anchorsin each row of reinforcing. For instance in the above elevation a panel is shown asfollows:

The panel type is a G with the top row of panel anchors containing 4 and the bottomrow of anchors containing 6. Connected to the top row of anchors is a Type-2 soil-reinforcing element and connected to the bottom row of anchors is a Type-3 soil-reinforcing element. Typically, a panel less than or equal to three feet requires onerow of panel anchors, a panel between three feet and six feet requires two rows ofpanel anchors and a panel that is greater than, or equal to, six feet requires threerows of panel anchors.

2

G46

3


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The pre-caster will place this panel designator on the back face of each panel withthe lot number and date the lot was cast. It is the erectors responsibility to make sureeach panel is placed in the wall at the proper location and orientation as detailed inthe plans.

The wall erector shall give a schedule of erection to the pre-caster. Notice shall be

given to the pre-caster as to which structure to begin casting . The erector shall notifythe pre-caster a minimum one week before said erection shall take place. The wallerector shall keep track of all panel shipments and a log of what panels were erected,on which day, and in what structure.

The first row of panels is placed on the leveling course. If the leveling course is notplaced properly, the panel will need to be adjusted to insure that the horizontal andvertical alignment is achieved and maintained during the erection process. Panelsthat are of poor quality and that do not meet tolerances shall not be used and shallbe rejected and set aside. Inspection of the panel should be performed when thepanels arrive to the site. The wall erector should make note as to the panel number,lot number, date and reason for rejecting the panel. This list shall be given to theowner and wall supplier.

It is important to achieve the required joint spacing in the first row of panels. Properspacing and alignment in the first row will make subsequent rows line up and easierto install. Some difference in vertical tolerance can be corrected by using a hardwood shim. It should be noted that the use of hard wood shims should be kept to aminimum and that they should be removed before the third row of panels are placed.

4.2 BACKFILL PLACEMENT

The placement of the backfill should begin parallel to the wall face at a distancegreater than or equal to 3 feet from the back face of the panel. The backfill should be

placed in 6 compacted layers. The fill shall be leveled by equipment moving parallelto the wall face. The material shall be spread so it is fanned toward the tail of the mat.The placement of the backfill from the front of the soil reinforcement to the tail of thesoil reinforcement will keep the soil reinforcement tight. It will also help to lock thepanel and reinforcement together at the connection.


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Compaction of the backfill a distance of 3 feet from the back face of the panel shallbe performed with an 8-10 ton roller. A smooth wheel or rubber tire roller is alsoacceptable. No compactors that employ grid type rollers shall be used. Compactionmust be parallel to the wall face working toward the end of the reinforcement. Propermoisture content of the backfill material should be maintained uniformly within eachlayer. The material should be placed on the dry side of the optimum moisturecontent. Care should be used in adding water to the backfill material.

The 3-foot area of fill located at the back of the panel is placed with an end loaderand spread manually. The material is then compacted with the use of a 1000-poundvibratory roller or plate compactor. Care should be exercised when compacting thisarea so as not to disturb the alignment of the panel. Compaction should take placefrom the back face of the panel to the end of the mat.

Compaction tests and gradation tests should be taken and recorded per the contractplans. These reports shall be made part of the wall erectors log. Proper compactionwill alleviate possible problems in the future performance of the structure. Impropercompaction can cause outward movement of the panels.

4.3 SOIL REINFORCEMENT PLACEMENT

A welded wire soil reinforcement grid is passed through the panel anchors andsecured together with a steel connection pin.


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TYPICAL SEW CONNECTION - SECTION DETAIL

The shop drawings panel attribute label defines the soil reinforcement type to beused in each layer. This is labeled with the panel designator number as describedpreviously. The mat type is defined in the soil-reinforcing schedule. The panelschedule defines the width of the mat, and the size and spacing of each of the gridmembers. The length of the soil reinforcing mat is given under the dimension line inthe elevation drawing and is identified by the alphanumeric designator, B = . It isimportant that the wall erector place the correct size, length and configuration of soil

reinforcement with the correct panel and location in the wall. Typically, heaviergauge wire with greater transverse spacing is required in the bottom of the structureand a lighter gauge wire with a closer transverse spacing is required at the top of thestructure.

The soil-reinforcement is placed on the compacted select backfill and the connectionis made to the panel. The soil-reinforcement is connected to the panel by engagingthe longitudinal crimped end of the soil -reinforcement within the panel anchor andpassing a connection pin through the crimped end. Passing a connection pin throughthe opening created at the crimped location joins the soil reinforcement and paneltogether. After the connection is made, the soil reinforcement should be tensioned inorder to take out any slack at the connection. It is easier to make the connection tothe panel when the backfill material is placed level with, or slightly higher than, the

anchor. The wall erector should verify that all longitudinal wires are connected to ananchor and that the connection pin engages each loop. Any panel that has anchorsmissing or severely bent shall not be used, but shall be set aside and either repairedor rejected.


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4.4 OBSTRUCTIONS

During the design phase an attempt is made to detail special panels, andconnections at the locations of vertical and horizontal obstructions. High-density soilreinforcement will be used to span these locations.

Do not attach the longitudinal wire to the obstruction. If it is necessary to cut the soilreinforcement in the field, the exposed black steel areas should be coated with a zincrich paint. Cutting of the reinforcement shall only be performed at the direction of theengineer and only at the transverse wires.

Horizontal obstructions can be passed by gradually skewing the soil reinforcementabove or below the obstruction. If the soil reinforcement is skewed horizontally, careshould be taken so as not to kink the reinforcement. Keep the deflected angle less

than 15. Place a 4-6 buffer of soil over the obstruction before the placement of thesoil reinforcement.

4.5 DRAINAGE

It is extremely important not to allow the reinforced volume to become saturated at

any time during construction. At each days end proper precautions shall be taken inorder to assure that the MSE volume does not become saturated. The wall erectorshall slope the reinforced volume of soil away from the facing elements at the end ofeach days operation. Saturation of the reinforced volume can result in destabilizingforces that cause the structure to fail. Heavy rainfall can cause erosion of the soilfrom within the layers of the reinforced volume especially at the end of theconstructed wall segment. If any erosion does occur, or if the backfill becomessaturated, it shall be replaced with non-saturated material that conforms to the


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backfill specifications. Care shall be taken during periods of heavy rain to assureproper drainage and to provide positive flow away from the facing.

4.6 FINISH GRADE PLACEMENT

The placement of the fill material for the finish grade in front of the wall shall occurbefore the wall height exceeds 20 feet. Ideally, the finish grade should be placed as

soon as possible to prevent undercutting of the leveling course, and possiblefoundation saturation. Although the fill in front of the wall is not considered in thestability calculations it should be understood that any excavation in front of the wall atdepths below the leveling course could greatly affect the structural stability andintegrity of the reinforced volume. No excavation below the leveling course shall beallowed until written permission is received from the Engineer of Record and the wallsupplier.

4.7 COPING PLACEMENT

The placement of the coping requires that the top of wall be at the proper elevationand orientation as shown in the contract plans. Leveling concrete is used in the areabetween the top panel and the coping seat. The leveling concrete is placed in a

wooden form that is attached to the panels. The required elevation is marked on theinside of the form and the leveling concrete is placed in the form and leveled to themarked line.


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Depending on the coping that is used the details may call for dowels that tie thecoping panel and coping together. Because the coping is usually placed at a slopeon the top panel it is very difficult to pre-cast any type of insert into the panel orcoping and assure that they will line up in the field. Experience has shown that thebest solution for placing dowels in a sloped coping panel is to field drill them after thepanel is set.

It is possible to cast inserts into coping that is parallel to the top panel. The desirednumber of inserts is cast into the coping and into the panel and a dowel inserted inthe field. It should be noted that the dowel is only helping prevent the coping frombeing pushed off of the wall by construction equipment and that it is not designed asan impact transfer mechanism.


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5 TYPICAL WALL COMPONENTS

STANDARD TBSS 5x5 PANEL

COMPONENTS

1 TYPICAL PRE-CAST PANEL WITH ANCHORS (2 ROWS ANCHORS)

2 2-2 X 6 X 1/2 NEOPRENE BEARING PAD (2 PER PANEL @ ALIGNMENT PIN)

3 2-1/2 X 8 GALVANIZED STEEL ALIGNMENT PINS (2 PER PANEL)

4 12 WIDE FILTER FABRIC (ALL JOINTS)

6 CONNECTION PIN (ONE PER SOIL REINFORCING MAT)

7 WELDED WIRE GRID SOIL REINFORCING MAT (AS REQUIRED)


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6 ERECTION SEQUENCE6.1 STEP ONE

1. Excavate and prepare foundation

2. From and place leveling course to grades, lines and widths as shownon the project shop drawings.

3. Place first row of panels on leveling course.

4. Plumb panels and brace as is required.


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6.2 STEP TWO

1. Place filter fabric on back face of panel at all vertical and horizontaljoints and secure to panel with adhesive.

2. Place and compact backfill on prepared foundation to the level of thefirst row of panel anchors. Leave a void at the face of the wall


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6.3 STEP THREE

1. Place soil reinforcing on compacted backfill making sure that it is theright type.

2. Connect soil reinforcing to panel anchor by placing the crimped end intothe panel anchor and passing a connection pin through the intersection

of the crimp and panel anchor at the bottom of the anchor.


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6.4 STEP FOUR

1. Place soil on tail of soil reinforcing to prevent the soil reinforcing frommoving

2. Place selected backfill in the void at the back face of the panel andcompact.

3. Place select backfill to level of top of first row of half panel and compact.

Make sure to place alignment pin in top edge of panel before placingbackfill to prevent alignment pin hole form becoming filled with backfillmaterial.

4. Remove clamps and blocking from first row of half panels.


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6.5 STEP FIVE

1. Place the next row of alternating panels over the alignment pins and

clamp to adjacent panel to prevent movement.

2. Place next layer of selected backfill leaving a void at the back face ofthe panel and compact.

3. Remove external bracing.

4. Repeat installation Steps 2-5 until top row of panels are placed.


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6.7 STEP 7

1. Place backfill to level of bottom of coping or bottom of moment slab.

2. Form and place coping unit.

3. Form and place moment slab.

4. Form and place traffic barrier.

Note: If a one piece coping unit and traffic barrier are being used omitstep 4


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6.8 FILTER FABRIC PLACEMENT

1. Place 12 wide filter fabric centerline of all horizontal and vertical joints.

2. Adhere filter fabric with adhesive.

3. There shall be a 12 overlap at staggered joints and betweendiscontinuous joints.


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6.9 PANEL LIFTING

1. Lift panels with approved lifting device pursuant to Burke Spread

Anchor - One Ton specifications.


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7 MSE CHECK LIST

1. Yes No Do you have an approved copy of shop drawings?

2. Yes No Do you have backfill certifications?

3. Yes No Do you have material certifications?

4. Yes No Does the wire mill have material manufacturing and

inspection certifications?

5. Yes No Is all material on site?

6. Yes No Is material stored properly to prevent on site damage?

7. Yes No Has damaged material been recorded and a copy of

rejected material given to suppliers?

8. Yes No Is the foundation excavated and proof rolled per the

specifications and to the required width and elevation?

9. Yes No Has unsuitable material been compacted or removed

and replaced?10. Yes No Is the first row of soil reinforcing mats properly placed,

aligned, and spaced.

11. Yes No Are the proper face panels being installed?

12. Yes No Are the required number of soil reinforcing mats and

the correct type being used?

13. Yes No Are the correct connection pins being used and are the

mats making proper contact with the face piece?

14. Yes No Is the filter fabric or screen cloth being properly placed

and hog-ringed to the face piece?15 Yes No Is the fill being properly placed? Are they using 12-

inch lifts? Are they spreading backfill from one foot of

back face of panel to tail of mat?

16. Yes No Is the equipment being kept off of the mat until 6 of

material is placed?

17. Yes No Is proper compaction being met? A minimum 90% of

maximum density for first one foot and 95% of

maximum density for the remaining area.

18. Yes No Are the mats properly aligned?

19. Yes No Is the vertical and horizontal alignment of the structure

being checked periodically?

20. Yes No At the end of each days operation is the reinforced

volume being protected from runoff and saturation?


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panel wall installation

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