diff --git a/sw/qa/extras/tiledrendering/tiledrendering.cxx b/sw/qa/extras/tiledrendering/tiledrendering.cxx
index 230c3588026b..346023898c23 100644
--- a/sw/qa/extras/tiledrendering/tiledrendering.cxx
+++ b/sw/qa/extras/tiledrendering/tiledrendering.cxx
@@ -3085,8 +3085,8 @@ CPPUNIT_TEST_FIXTURE(SwTiledRenderingTest, testDropDownFormFieldButton)
         OStringBuffer aItemList;
         for (auto &item : aItems)
         {
-            aItemList.append(item.second.get_value<std::string>().c_str());
-            aItemList.append(";");
+            aItemList.append(item.second.get_value<std::string>().c_str()
+                + OString::Concat(";"));
         }
         CPPUNIT_ASSERT_EQUAL(OString("2019/2020;2020/2021;2021/2022;2022/2023;2023/2024;2024/2025;"), aItemList.toString());
 
diff --git a/sw/source/core/crsr/crsrsh.cxx b/sw/source/core/crsr/crsrsh.cxx
index 9d94c133f028..b8dd11dc533f 100644
--- a/sw/source/core/crsr/crsrsh.cxx
+++ b/sw/source/core/crsr/crsrsh.cxx
@@ -1330,14 +1330,14 @@ OUString SwCursorShell::getPageRectangles()
     OUStringBuffer aBuf;
     for (const SwFrame* pFrame = pLayout->GetLower(); pFrame; pFrame = pFrame->GetNext())
     {
-        aBuf.append(pFrame->getFrameArea().Left());
-        aBuf.append(", ");
-        aBuf.append(pFrame->getFrameArea().Top());
-        aBuf.append(", ");
-        aBuf.append(pFrame->getFrameArea().Width());
-        aBuf.append(", ");
-        aBuf.append(pFrame->getFrameArea().Height());
-        aBuf.append("; ");
+        aBuf.append(OUString::number(pFrame->getFrameArea().Left())
+            + ", "
+            + OUString::number(pFrame->getFrameArea().Top())
+            + ", "
+            + OUString::number(pFrame->getFrameArea().Width())
+            + ", "
+            + OUString::number(pFrame->getFrameArea().Height())
+            + "; ");
     }
     if (!aBuf.isEmpty())
         aBuf.setLength( aBuf.getLength() - 2); // remove the last "; "
diff --git a/sw/source/core/doc/dbgoutsw.cxx b/sw/source/core/doc/dbgoutsw.cxx
index 20f8e6ecae9f..8b1f18348796 100644
--- a/sw/source/core/doc/dbgoutsw.cxx
+++ b/sw/source/core/doc/dbgoutsw.cxx
@@ -298,9 +298,7 @@ static OUString lcl_dbg_out(const SwpHints & rHints)
 
     for (size_t i = 0; i < rHints.Count(); ++i)
     {
-        aStr.append("  ");
-        aStr.append(lcl_dbg_out(*rHints.Get(i)));
-        aStr.append("\n");
+        aStr.append("  " + lcl_dbg_out(*rHints.Get(i)) + "\n");
     }
 
     aStr.append("]\n");
@@ -647,8 +645,7 @@ static OUString lcl_dbg_out(SwOutlineNodes const & rNodes)
 
     for (size_t i = 0; i < rNodes.size(); i++)
     {
-        aStr.append(lcl_dbg_out(*rNodes[i]));
-        aStr.append("\n");
+        aStr.append(lcl_dbg_out(*rNodes[i]) + "\n");
     }
 
     aStr.append("]\n");
@@ -669,10 +666,7 @@ static OUString lcl_dbg_out(const SvxNumberFormat & rFormat)
 
 static OUString lcl_dbg_out(const SwNumRule & rRule)
 {
-    OUStringBuffer aResult("[ ");
-
-    aResult.append(rRule.GetName());
-    aResult.append(" [");
+    OUStringBuffer aResult("[ " + rRule.GetName() + " [");
 
     for (sal_uInt8 n = 0; n < MAXLEVEL; n++)
     {
@@ -682,9 +676,7 @@ static OUString lcl_dbg_out(const SwNumRule & rRule)
         aResult.append(lcl_dbg_out(rRule.Get(n)));
     }
 
-    aResult.append("]");
-
-    aResult.append("]");
+    aResult.append("]]");
 
     return aResult.makeStringAndClear();
 }
@@ -792,9 +784,7 @@ static OUString lcl_dbg_out(const SwFormTokens & rTokens)
         if (aIt != rTokens.begin())
             aStr.append(", ");
 
-        aStr.append(lcl_TokenType2Str(aIt->eTokenType));
-        aStr.append(": ");
-        aStr.append(lcl_dbg_out(*aIt));
+        aStr.append(lcl_TokenType2Str(aIt->eTokenType) + ": " + lcl_dbg_out(*aIt));
     }
 
     aStr.append("]");
diff --git a/sw/source/core/fields/reffld.cxx b/sw/source/core/fields/reffld.cxx
index c0ed059e2882..d8a66d6ec7a7 100644
--- a/sw/source/core/fields/reffld.cxx
+++ b/sw/source/core/fields/reffld.cxx
@@ -404,8 +404,7 @@ static OUString lcl_formatStringByCombiningCharacter(std::u16string_view sText,
     OUStringBuffer sRet(sText.size() * 2);
     for (size_t i = 0; i < sText.size(); ++i)
     {
-        sRet.append(sText[i]);
-        sRet.append(cChar);
+        sRet.append(OUStringChar(sText[i]) + OUStringChar(cChar));
     }
     return sRet.makeStringAndClear();
 }
diff --git a/sw/source/core/layout/dbg_lay.cxx b/sw/source/core/layout/dbg_lay.cxx
index 37d4c5271557..256038d24c6d 100644
--- a/sw/source/core/layout/dbg_lay.cxx
+++ b/sw/source/core/layout/dbg_lay.cxx
@@ -675,8 +675,7 @@ void SwImplProtocol::Record_( const SwFrame* pFrame, PROT nFunction, DbgAction n
                             lcl_Start(aOut, m_aLayer, nAct);
                             if( pParam )
                             {
-                                aOut.append(' ');
-                                aOut.append(static_cast<sal_Int32>(*static_cast<sal_uInt16*>(pParam)));
+                                aOut.append(" " + OString::number(static_cast<sal_Int32>(*static_cast<sal_uInt16*>(pParam))));
                             }
                             break;
         case PROT::GrowTest:
@@ -703,8 +702,7 @@ void SwImplProtocol::Record_( const SwFrame* pFrame, PROT nFunction, DbgAction n
                             lcl_Start(aOut, m_aLayer, nAct);
                             if( pParam )
                             {
-                                aOut.append(' ');
-                                aOut.append(static_cast<sal_Int64>(*static_cast<tools::Long*>(pParam)));
+                                aOut.append(" " + OString::number(static_cast<sal_Int64>(*static_cast<tools::Long*>(pParam))));
                             }
                             break;
         case PROT::PrintArea:  aOut.append("PROT::PrintArea");
@@ -751,31 +749,31 @@ void SwImplProtocol::Record_( const SwFrame* pFrame, PROT nFunction, DbgAction n
                                 SwRect& rFrame = *static_cast<SwRect*>(pParam);
                                 if( pFrame->getFrameArea().Pos() != rFrame.Pos() )
                                 {
-                                    aOut.append("PosChg: (");
-                                    aOut.append(static_cast<sal_Int64>(rFrame.Left()));
-                                    aOut.append(", ");
-                                    aOut.append(static_cast<sal_Int64>(rFrame.Top()));
-                                    aOut.append(") -> (");
-                                    aOut.append(static_cast<sal_Int64>(pFrame->getFrameArea().Left()));
-                                    aOut.append(", ");
-                                    aOut.append(static_cast<sal_Int64>(pFrame->getFrameArea().Top()));
-                                    aOut.append(") ");
+                                    aOut.append("PosChg: ("
+                                        + OString::number(static_cast<sal_Int64>(rFrame.Left()))
+                                        + ", "
+                                        + OString::number(static_cast<sal_Int64>(rFrame.Top()))
+                                        + ") -> ("
+                                        + OString::number(static_cast<sal_Int64>(pFrame->getFrameArea().Left()))
+                                        + ", "
+                                        + OString::number(static_cast<sal_Int64>(pFrame->getFrameArea().Top()))
+                                        + ") ");
                                 }
                                 if( pFrame->getFrameArea().Height() != rFrame.Height() )
                                 {
-                                    aOut.append("Height: ");
-                                    aOut.append(static_cast<sal_Int64>(rFrame.Height()));
-                                    aOut.append(" -> ");
-                                    aOut.append(static_cast<sal_Int64>(pFrame->getFrameArea().Height()));
-                                    aOut.append(" ");
+                                    aOut.append("Height: "
+                                        + OString::number(static_cast<sal_Int64>(rFrame.Height()))
+                                        + " -> "
+                                        + OString::number(static_cast<sal_Int64>(pFrame->getFrameArea().Height()))
+                                        + " ");
                                 }
                                 if( pFrame->getFrameArea().Width() != rFrame.Width() )
                                 {
-                                    aOut.append("Width: ");
-                                    aOut.append(static_cast<sal_Int64>(rFrame.Width()));
-                                    aOut.append(" -> ");
-                                    aOut.append(static_cast<sal_Int64>(pFrame->getFrameArea().Width()));
-                                    aOut.append(' ');
+                                    aOut.append("Width: "
+                                        + OString::number(static_cast<sal_Int64>(rFrame.Width()))
+                                        + " -> "
+                                        + OString::number(static_cast<sal_Int64>(pFrame->getFrameArea().Width()))
+                                        + " ");
                                 }
                                 break;
                             }
diff --git a/sw/source/core/tox/ToxTextGenerator.cxx b/sw/source/core/tox/ToxTextGenerator.cxx
index 1ef2a59d55bf..158cc0c72bc7 100644
--- a/sw/source/core/tox/ToxTextGenerator.cxx
+++ b/sw/source/core/tox/ToxTextGenerator.cxx
@@ -451,8 +451,7 @@ ToxTextGenerator::ConstructPageNumberPlaceholder(size_t numberOfToxSources)
     // Place holder for the PageNumber; we only respect the first one
     retval.append(C_NUM_REPL);
     for (size_t i = 1; i < numberOfToxSources; ++i) {
-        retval.append(SwTOXMark::S_PAGE_DELI);
-        retval.append(C_NUM_REPL);
+        retval.append(SwTOXMark::S_PAGE_DELI + OUStringChar(C_NUM_REPL));
     }
     retval.append(C_END_PAGE_NUM);
     return retval.makeStringAndClear();
diff --git a/sw/source/core/txtnode/atrftn.cxx b/sw/source/core/txtnode/atrftn.cxx
index 1624e6d29f96..59eb9b12f8f5 100644
--- a/sw/source/core/txtnode/atrftn.cxx
+++ b/sw/source/core/txtnode/atrftn.cxx
@@ -205,8 +205,7 @@ OUString SwFormatFootnote::GetFootnoteText(SwRootFrame const& rLayout) const
             while ( !aIdx.GetNode().IsEndNode() ) {
                 if ( aIdx.GetNode().IsTextNode() )
                 {
-                    buf.append("  ");
-                    buf.append(aIdx.GetNode().GetTextNode()->GetExpandText(&rLayout));
+                    buf.append("  " + aIdx.GetNode().GetTextNode()->GetExpandText(&rLayout));
                 }
                 ++aIdx;
             }
diff --git a/sw/source/filter/html/htmlfldw.cxx b/sw/source/filter/html/htmlfldw.cxx
index fb34dc56ff01..45c04b973150 100644
--- a/sw/source/filter/html/htmlfldw.cxx
+++ b/sw/source/filter/html/htmlfldw.cxx
@@ -270,8 +270,10 @@ static SwHTMLWriter& OutHTML_SwField( SwHTMLWriter& rWrt, const SwField* pField,
     {
         OStringBuffer sOut("<"
             + rWrt.GetNamespace()
-            + OOO_STRING_SVTOOLS_HTML_sdfield " "
-            OOO_STRING_SVTOOLS_HTML_O_type "="
+            + OOO_STRING_SVTOOLS_HTML_sdfield
+            " "
+            OOO_STRING_SVTOOLS_HTML_O_type
+            "="
             + pTypeStr);
         if( pSubStr )
         {
@@ -554,17 +556,15 @@ SwHTMLWriter& OutHTML_SwFormatField( SwHTMLWriter& rWrt, const SfxPoolItem& rHt
 
             if (bFieldShadings)
             {
-                OStringBuffer sOut;
-                sOut.append("<" + rWrt.GetNamespace() + OOO_STRING_SVTOOLS_HTML_span);
-                sOut.append(" " OOO_STRING_SVTOOLS_HTML_O_style "=\"");
-                sOut.append(sCSS1_P_background);
-                sOut.append(": ");
-
                 const Color& rColor = pViewOptions->GetFieldShadingsColor();
-                sOut.append(GetCSS1_Color(rColor));
-                sOut.append("\">");
+                OString sOut(
+                    "<" + rWrt.GetNamespace() + OOO_STRING_SVTOOLS_HTML_span
+                    " " OOO_STRING_SVTOOLS_HTML_O_style "=\""
+                    + sCSS1_P_background
+                    + ": "
+                    + GetCSS1_Color(rColor)
+                    + "\">");
                 rWrt.Strm().WriteOString(sOut);
-                sOut.setLength(0);
             }
 
             OutHTML_SwField( rWrt, pField, pTextField->GetTextNode(),
diff --git a/sw/source/filter/html/htmlflywriter.cxx b/sw/source/filter/html/htmlflywriter.cxx
index b35d25dc7ab6..85caaff8d896 100644
--- a/sw/source/filter/html/htmlflywriter.cxx
+++ b/sw/source/filter/html/htmlflywriter.cxx
@@ -1391,27 +1391,26 @@ SwHTMLWriter& OutHTML_ImageStart( HtmlWriter& rHtml, SwHTMLWriter& rWrt, const S
         aTag = OOO_STRING_SVTOOLS_HTML_object;
     rHtml.start(aTag);
 
-    OStringBuffer sBuffer;
     if(rWrt.mbEmbedImages)
     {
         OUString aGraphicInBase64;
         if (XOutBitmap::GraphicToBase64(rGraphic, aGraphicInBase64))
         {
-            sBuffer.append(OOO_STRING_SVTOOLS_HTML_O_data);
-            sBuffer.append(":");
-            sBuffer.append(OUStringToOString(aGraphicInBase64, RTL_TEXTENCODING_UTF8));
-            rHtml.attribute(OOO_STRING_SVTOOLS_HTML_O_src, sBuffer.makeStringAndClear().getStr());
+            OString sBuffer(OString::Concat(OOO_STRING_SVTOOLS_HTML_O_data)
+                + ":"
+                + OUStringToOString(aGraphicInBase64, RTL_TEXTENCODING_UTF8));
+            rHtml.attribute(OOO_STRING_SVTOOLS_HTML_O_src, sBuffer.getStr());
         }
         else
             rWrt.m_nWarn = WARN_SWG_POOR_LOAD;
     }
     else
     {
-        sBuffer.append(OUStringToOString(aGraphicURL, RTL_TEXTENCODING_UTF8));
+        OString sBuffer(OUStringToOString(aGraphicURL, RTL_TEXTENCODING_UTF8));
         OString aAttribute(OOO_STRING_SVTOOLS_HTML_O_src);
         if (bReplacement)
             aAttribute = OOO_STRING_SVTOOLS_HTML_O_data;
-        rHtml.attribute(aAttribute, sBuffer.makeStringAndClear().getStr());
+        rHtml.attribute(aAttribute, sBuffer.getStr());
     }
 
     if (bReplacement)
@@ -1523,8 +1522,7 @@ SwHTMLWriter& OutHTML_BulletImage( SwHTMLWriter& rWrt,
     if( pTag )
         sOut.append(OString::Concat("<") + pTag);
 
-    sOut.append(' ');
-    sOut.append(OOO_STRING_SVTOOLS_HTML_O_style "=\"");
+    sOut.append(" " OOO_STRING_SVTOOLS_HTML_O_style "=\"");
     if(!aLink.isEmpty())
     {
         sOut.append(OOO_STRING_SVTOOLS_HTML_O_src "=\"");
diff --git a/sw/source/filter/html/htmlftn.cxx b/sw/source/filter/html/htmlftn.cxx
index f57be78ea048..0f8b15ed4185 100644
--- a/sw/source/filter/html/htmlftn.cxx
+++ b/sw/source/filter/html/htmlftn.cxx
@@ -464,9 +464,9 @@ void SwHTMLWriter::OutFootEndNoteSym( const SwFormatFootnote& rFormatFootnote,
         }
     }
 
-    OStringBuffer sOut;
-    sOut.append("<" + GetNamespace() + OOO_STRING_SVTOOLS_HTML_anchor " "
-            OOO_STRING_SVTOOLS_HTML_O_class "=\"");
+    OStringBuffer sOut("<"
+        + GetNamespace() + OOO_STRING_SVTOOLS_HTML_anchor " "
+        OOO_STRING_SVTOOLS_HTML_O_class "=\"");
     Strm().WriteOString( sOut );
     sOut.setLength(0);
     HTMLOutFuncs::Out_String( Strm(), sClass );
diff --git a/sw/source/filter/html/htmlplug.cxx b/sw/source/filter/html/htmlplug.cxx
index c9b1c01c6ef6..83c047ef2603 100644
--- a/sw/source/filter/html/htmlplug.cxx
+++ b/sw/source/filter/html/htmlplug.cxx
@@ -1255,8 +1255,7 @@ SwHTMLWriter& OutHTML_FrameFormatOLENode( SwHTMLWriter& rWrt, const SwFrameForma
                                   "ole" );
     uno::Any aAny;
     SvGlobalName aGlobName( xObj->getClassID() );
-    OStringBuffer sOut;
-    sOut.append('<');
+    OStringBuffer sOut("<");
     if( aGlobName == SvGlobalName( SO3_PLUGIN_CLASSID ) )
     {
         // first the plug-in specifics
@@ -1427,15 +1426,16 @@ SwHTMLWriter& OutHTML_FrameFormatOLENode( SwHTMLWriter& rWrt, const SwFrameForma
             const OUString& rName = rCommand.GetCommand();
             const OUString& rValue = rCommand.GetArgument();
             rWrt.OutNewLine();
-            OStringBuffer sBuf;
-            sBuf.append("<" + rWrt.GetNamespace() + OOO_STRING_SVTOOLS_HTML_param
-                    " " OOO_STRING_SVTOOLS_HTML_O_name
-                    "=\"");
-            rWrt.Strm().WriteOString( sBuf );
+            sOut.append(
+                "<" + rWrt.GetNamespace() + OOO_STRING_SVTOOLS_HTML_param
+                " " OOO_STRING_SVTOOLS_HTML_O_name
+                "=\"");
+            rWrt.Strm().WriteOString( sOut );
             sOut.setLength(0);
             HTMLOutFuncs::Out_String( rWrt.Strm(), rName );
-            sBuf.append("\" " OOO_STRING_SVTOOLS_HTML_O_value "=\"");
-            rWrt.Strm().WriteOString( sBuf );
+            sOut.append("\" " OOO_STRING_SVTOOLS_HTML_O_value "=\"");
+            rWrt.Strm().WriteOString( sOut );
+            sOut.setLength(0);
             HTMLOutFuncs::Out_String( rWrt.Strm(), rValue ).WriteCharPtr( "\">" );
         }
 
diff --git a/sw/source/filter/html/htmltabw.cxx b/sw/source/filter/html/htmltabw.cxx
index 17a7874a7d28..1bd94a828188 100644
--- a/sw/source/filter/html/htmltabw.cxx
+++ b/sw/source/filter/html/htmltabw.cxx
@@ -310,8 +310,7 @@ void SwHTMLWrtTable::OutTableCell( SwHTMLWriter& rWrt,
     }
 
     rWrt.OutNewLine();  // <TH>/<TD> in new line
-    OStringBuffer sOut;
-    sOut.append('<');
+    OStringBuffer sOut("<");
     OString aTag(bHead ? OOO_STRING_SVTOOLS_HTML_tableheader : OOO_STRING_SVTOOLS_HTML_tabledata);
     sOut.append(rWrt.GetNamespace() + aTag);
 
diff --git a/sw/source/filter/html/swhtml.cxx b/sw/source/filter/html/swhtml.cxx
index 641bc3d87d1e..67502f1a278b 100644
--- a/sw/source/filter/html/swhtml.cxx
+++ b/sw/source/filter/html/swhtml.cxx
@@ -5460,21 +5460,21 @@ void SwHTMLParser::ParseMoreMetaOptions()
         return;
     }
 
-    OUStringBuffer sText;
-    sText.append("HTML: <");
-    sText.append(OOO_STRING_SVTOOLS_HTML_meta);
-    sText.append(' ');
+    OUStringBuffer sText(
+        "HTML: <"
+        OOO_STRING_SVTOOLS_HTML_meta
+        " ");
     if( bHTTPEquiv  )
         sText.append(OOO_STRING_SVTOOLS_HTML_O_httpequiv);
     else
         sText.append(OOO_STRING_SVTOOLS_HTML_O_name);
-    sText.append("=\"");
-    sText.append(aName);
-    sText.append("\" ");
-    sText.append(OOO_STRING_SVTOOLS_HTML_O_content);
-    sText.append("=\"");
-    sText.append(aContent);
-    sText.append("\">");
+    sText.append(
+        "=\"" + aName
+        + "\" "
+        OOO_STRING_SVTOOLS_HTML_O_content
+        "=\""
+        + aContent
+        + "\">");
 
     SwPostItField aPostItField(
         static_cast<SwPostItFieldType*>(m_xDoc->getIDocumentFieldsAccess().GetSysFieldType( SwFieldIds::Postit )),
diff --git a/sw/source/filter/html/wrthtml.cxx b/sw/source/filter/html/wrthtml.cxx
index aeb8080903d7..8ba792eb5a2f 100644
--- a/sw/source/filter/html/wrthtml.cxx
+++ b/sw/source/filter/html/wrthtml.cxx
@@ -715,8 +715,7 @@ static void lcl_html_OutSectionStartTag( SwHTMLWriter& rHTMLWrt,
     if( rHTMLWrt.m_bLFPossible )
         rHTMLWrt.OutNewLine();
 
-    OStringBuffer sOut;
-    sOut.append("<" + rHTMLWrt.GetNamespace() + OOO_STRING_SVTOOLS_HTML_division);
+    OStringBuffer sOut("<" + rHTMLWrt.GetNamespace() + OOO_STRING_SVTOOLS_HTML_division);
 
     const OUString& rName = rSection.GetSectionName();
     if( !rName.isEmpty() && !bContinued )
@@ -1217,8 +1216,7 @@ void SwHTMLWriter::OutAnchor( const OUString& rName )
         return;
     }
 
-    OStringBuffer sOut;
-    sOut.append("<" + GetNamespace() + OOO_STRING_SVTOOLS_HTML_anchor " ");
+    OStringBuffer sOut("<" + GetNamespace() + OOO_STRING_SVTOOLS_HTML_anchor " ");
     if (!mbXHTML)
     {
         sOut.append(OOO_STRING_SVTOOLS_HTML_O_name "=\"");
@@ -1448,8 +1446,7 @@ void SwHTMLWriter::OutLanguage( LanguageType nLang )
     if (!(LANGUAGE_DONTKNOW != nLang && !mbReqIF))
         return;
 
-    OStringBuffer sOut;
-    sOut.append(' ');
+    OStringBuffer sOut(" ");
     if (mbXHTML)
         sOut.append(OOO_STRING_SVTOOLS_XHTML_O_lang);
     else
diff --git a/sw/source/filter/ww8/docxattributeoutput.cxx b/sw/source/filter/ww8/docxattributeoutput.cxx
index 6577bf1dbdc3..60f93917117e 100644
--- a/sw/source/filter/ww8/docxattributeoutput.cxx
+++ b/sw/source/filter/ww8/docxattributeoutput.cxx
@@ -7413,9 +7413,9 @@ void DocxAttributeOutput::NumberingLevel( sal_uInt8 nLevel,
         // FIXME so far we support the ww8 limit of levels only
         if ( *pIt < sal_Unicode( WW8ListManager::nMaxLevel ) )
         {
-            aBuffer.append( pPrev, pIt - pPrev );
-            aBuffer.append( '%' );
-            aBuffer.append( sal_Int32( *pIt ) + 1 );
+            aBuffer.append( OUString::Concat(std::u16string_view(pPrev, pIt - pPrev))
+                + "%"
+                + OUString::number(sal_Int32( *pIt ) + 1 ));
 
             pPrev = pIt + 1;
         }
diff --git a/sw/source/filter/ww8/rtfattributeoutput.cxx b/sw/source/filter/ww8/rtfattributeoutput.cxx
index d4f417b0c9f6..74656bdb110f 100644
--- a/sw/source/filter/ww8/rtfattributeoutput.cxx
+++ b/sw/source/filter/ww8/rtfattributeoutput.cxx
@@ -180,17 +180,16 @@ static OString OutTBLBorderLine(RtfExport const& rExport, const editeng::SvxBord
         else
         {
             // use \brdrth to double the value range...
-            aRet.append(OOO_STRING_SVTOOLS_RTF_BRDRTH OOO_STRING_SVTOOLS_RTF_BRDRW);
-            aRet.append(static_cast<sal_Int32>(fConverted) / 2);
+            aRet.append(OOO_STRING_SVTOOLS_RTF_BRDRTH OOO_STRING_SVTOOLS_RTF_BRDRW
+                        + OString::number(static_cast<sal_Int32>(fConverted) / 2));
         }
 
-        aRet.append(OOO_STRING_SVTOOLS_RTF_BRDRCF);
-        aRet.append(static_cast<sal_Int32>(rExport.GetColor(pLine->GetColor())));
+        aRet.append(OOO_STRING_SVTOOLS_RTF_BRDRCF
+                    + OString::number(static_cast<sal_Int32>(rExport.GetColor(pLine->GetColor()))));
     }
     else // tdf#129758 "no border" may be needed to override style
     {
-        aRet.append(pStr);
-        aRet.append(OOO_STRING_SVTOOLS_RTF_BRDRNONE);
+        aRet.append(OString::Concat(pStr) + OOO_STRING_SVTOOLS_RTF_BRDRNONE);
     }
     return aRet.makeStringAndClear();
 }
@@ -203,8 +202,7 @@ static OString OutBorderLine(RtfExport const& rExport, const editeng::SvxBorderL
     aRet.append(OutTBLBorderLine(rExport, pLine, pStr));
     if (pLine)
     {
-        aRet.append(OOO_STRING_SVTOOLS_RTF_BRSP);
-        aRet.append(static_cast<sal_Int32>(nDist));
+        aRet.append(OOO_STRING_SVTOOLS_RTF_BRSP + OString::number(static_cast<sal_Int32>(nDist)));
     }
     if (eShadowLocation == SvxShadowLocation::BottomRight)
         aRet.append(LO_STRING_SVTOOLS_RTF_BRDRSH);
@@ -381,9 +379,7 @@ void RtfAttributeOutput::StartParagraphProperties()
     OStringBuffer aPar;
     if (!m_rExport.GetRTFFlySyntax())
     {
-        aPar.append(OOO_STRING_SVTOOLS_RTF_PARD);
-        aPar.append(OOO_STRING_SVTOOLS_RTF_PLAIN);
-        aPar.append(' ');
+        aPar.append(OOO_STRING_SVTOOLS_RTF_PARD OOO_STRING_SVTOOLS_RTF_PLAIN " ");
     }
     if (!m_bBufferSectionHeaders)
         m_rExport.Strm().WriteOString(aPar);
@@ -654,9 +650,8 @@ void RtfAttributeOutput::FormatDrop(const SwTextNode& /*rNode*/,
 void RtfAttributeOutput::ParagraphStyle(sal_uInt16 nStyle)
 {
     OString* pStyle = m_rExport.GetStyle(nStyle);
-    OStringBuffer aStyle;
-    aStyle.append(OOO_STRING_SVTOOLS_RTF_S);
-    aStyle.append(static_cast<sal_Int32>(nStyle));
+    OStringBuffer aStyle(OOO_STRING_SVTOOLS_RTF_S
+                         + OString::number(static_cast<sal_Int32>(nStyle)));
     if (pStyle)
         aStyle.append(*pStyle);
     if (!m_bBufferSectionHeaders)
@@ -2248,9 +2243,8 @@ void RtfAttributeOutput::OutputFlyFrame_Impl(const ww8::Frame& rFrame, const Poi
                                 aBuf.append(char(0x00));
                             xPropSet->getPropertyValue("Name") >>= aTmp;
                             aStr = OUStringToOString(aTmp, m_rExport.GetCurrentEncoding());
-                            aBuf.append(static_cast<char>(aStr.getLength()));
-                            aBuf.append(aStr);
-                            aBuf.append(char(0x00));
+                            aBuf.append(OStringChar(static_cast<char>(aStr.getLength())) + aStr
+                                        + OStringChar(char(0x00)));
                             xPropSet->getPropertyValue("DefaultText") >>= aTmp;
                             aStr = OUStringToOString(aTmp, m_rExport.GetCurrentEncoding());
                             aBuf.append(static_cast<char>(aStr.getLength()));
@@ -4112,31 +4106,27 @@ static OString ExportPICT(const SwFlyFrameFormat* pFlyFrameFormat, const Size& r
         //Given the original size and taking cropping into account
         //first, how much has the original been scaled to get the
         //final rendered size
-        aRet.append(OOO_STRING_SVTOOLS_RTF_PICSCALEX);
-        aRet.append(static_cast<sal_Int32>((100 * rRendered.Width()) / nXCroppedSize));
-        aRet.append(OOO_STRING_SVTOOLS_RTF_PICSCALEY);
-        aRet.append(static_cast<sal_Int32>((100 * rRendered.Height()) / nYCroppedSize));
+        aRet.append(
+            OOO_STRING_SVTOOLS_RTF_PICSCALEX
+            + OString::number(static_cast<sal_Int32>((100 * rRendered.Width()) / nXCroppedSize))
+            + OOO_STRING_SVTOOLS_RTF_PICSCALEY
+            + OString::number(static_cast<sal_Int32>((100 * rRendered.Height()) / nYCroppedSize))
 
-        aRet.append(OOO_STRING_SVTOOLS_RTF_PICCROPL);
-        aRet.append(rCr.GetLeft());
-        aRet.append(OOO_STRING_SVTOOLS_RTF_PICCROPR);
-        aRet.append(rCr.GetRight());
-        aRet.append(OOO_STRING_SVTOOLS_RTF_PICCROPT);
-        aRet.append(rCr.GetTop());
-        aRet.append(OOO_STRING_SVTOOLS_RTF_PICCROPB);
-        aRet.append(rCr.GetBottom());
+            + OOO_STRING_SVTOOLS_RTF_PICCROPL + OString::number(rCr.GetLeft())
+            + OOO_STRING_SVTOOLS_RTF_PICCROPR + OString::number(rCr.GetRight())
+            + OOO_STRING_SVTOOLS_RTF_PICCROPT + OString::number(rCr.GetTop())
+            + OOO_STRING_SVTOOLS_RTF_PICCROPB + OString::number(rCr.GetBottom())
 
-        aRet.append(OOO_STRING_SVTOOLS_RTF_PICW);
-        aRet.append(static_cast<sal_Int32>(rMapped.Width()));
-        aRet.append(OOO_STRING_SVTOOLS_RTF_PICH);
-        aRet.append(static_cast<sal_Int32>(rMapped.Height()));
+            + OOO_STRING_SVTOOLS_RTF_PICW + OString::number(static_cast<sal_Int32>(rMapped.Width()))
+            + OOO_STRING_SVTOOLS_RTF_PICH
+            + OString::number(static_cast<sal_Int32>(rMapped.Height()))
 
-        aRet.append(OOO_STRING_SVTOOLS_RTF_PICWGOAL);
-        aRet.append(static_cast<sal_Int32>(rOrig.Width()));
-        aRet.append(OOO_STRING_SVTOOLS_RTF_PICHGOAL);
-        aRet.append(static_cast<sal_Int32>(rOrig.Height()));
+            + OOO_STRING_SVTOOLS_RTF_PICWGOAL
+            + OString::number(static_cast<sal_Int32>(rOrig.Width()))
+            + OOO_STRING_SVTOOLS_RTF_PICHGOAL
+            + OString::number(static_cast<sal_Int32>(rOrig.Height()))
 
-        aRet.append(pBLIPType);
+            + pBLIPType);
         if (bIsWMF)
         {
             aRet.append(sal_Int32(8));
diff --git a/sw/source/filter/xml/xmlexpit.cxx b/sw/source/filter/xml/xmlexpit.cxx
index bcbe282b6a2b..a39d12228c0a 100644
--- a/sw/source/filter/xml/xmlexpit.cxx
+++ b/sw/source/filter/xml/xmlexpit.cxx
@@ -776,9 +776,9 @@ bool SvXMLExportItemMapper::QueryXMLValue(
                                 ::sax::Converter::convertMeasure(aOut, nWidth,
                                        util::MeasureUnit::TWIP,
                                        util::MeasureUnit::POINT);
-                                aOut.append( ' ' );
-                                aOut.append( GetXMLToken( eStyle ) );
-                                aOut.append( ' ' );
+                                aOut.append( " "
+                                    + GetXMLToken( eStyle )
+                                    + " " );
                                 ::sax::Converter::convertColor(aOut,
                                         pLine->GetColor());
                             }
diff --git a/sw/source/filter/xml/xmltexte.cxx b/sw/source/filter/xml/xmltexte.cxx
index 3161d416797c..5565de4dfcd6 100644
--- a/sw/source/filter/xml/xmltexte.cxx
+++ b/sw/source/filter/xml/xmltexte.cxx
@@ -330,8 +330,7 @@ void SwXMLTextParagraphExport::_exportTextEmbedded(
                     case '\\':
                         if( aBuffer.isEmpty() )
                         {
-                            aBuffer.append( '\'' );
-                            aBuffer.append( sRange.subView(0, i) );
+                            aBuffer.append( OUString::Concat("\'") + sRange.subView(0, i) );
                         }
                         if( '\'' == c || '\\' == c )
                             aBuffer.append( '\\' );
diff --git a/sw/source/ui/dbui/mmresultdialogs.cxx b/sw/source/ui/dbui/mmresultdialogs.cxx
index 0476b1894138..61f17c2f1f1b 100644
--- a/sw/source/ui/dbui/mmresultdialogs.cxx
+++ b/sw/source/ui/dbui/mmresultdialogs.cxx
@@ -1209,8 +1209,7 @@ IMPL_LINK_NOARG(SwMMResultEmailDialog, SendDocumentsHdl_Impl, weld::Button&, voi
                 bool bDone = pInStream->ReadLine( sLine );
                 while ( bDone )
                 {
-                    sBody.append( OStringToOUString(sLine, eEncoding) );
-                    sBody.append("\n");
+                    sBody.append( OStringToOUString(sLine, eEncoding) + "\n");
                     bDone = pInStream->ReadLine( sLine );
                 }
             }
diff --git a/sw/source/ui/misc/glossary.cxx b/sw/source/ui/misc/glossary.cxx
index a1b328e6a20e..71b97a6e8ac0 100644
--- a/sw/source/ui/misc/glossary.cxx
+++ b/sw/source/ui/misc/glossary.cxx
@@ -85,8 +85,7 @@ static OUString lcl_GetValidShortCut( const OUString& rName )
     while( rName[nStart-1]==' ' && nStart < nSz )
         nStart++;
 
-    OUStringBuffer aBuf;
-    aBuf.append(rName[nStart-1]);
+    OUStringBuffer aBuf(OUString::number(rName[nStart-1]));
 
     for( ; nStart < nSz; ++nStart )
     {
diff --git a/sw/source/uibase/dbui/dbmgr.cxx b/sw/source/uibase/dbui/dbmgr.cxx
index 2f94b26b7063..5a536cc9ef58 100644
--- a/sw/source/uibase/dbui/dbmgr.cxx
+++ b/sw/source/uibase/dbui/dbmgr.cxx
@@ -1004,8 +1004,7 @@ static rtl::Reference<SwMailMessage> lcl_CreateMailFromDoc(
         OStringBuffer sLine;
         while ( pInStream->ReadLine( sLine ) )
         {
-            sBody.append(OStringToOUString( sLine, sMailEncoding ));
-            sBody.append("\n");
+            sBody.append(OStringToOUString( sLine, sMailEncoding ) + "\n");
         }
     }
     pMessage->setSubject( rMergeDescriptor.sSubject );
diff --git a/sw/source/uibase/docvw/edtwin2.cxx b/sw/source/uibase/docvw/edtwin2.cxx
index dddfcbb31da7..94febf8b1f72 100644
--- a/sw/source/uibase/docvw/edtwin2.cxx
+++ b/sw/source/uibase/docvw/edtwin2.cxx
@@ -82,17 +82,15 @@ static OUString lcl_GetRedlineHelp( const SwRangeRedline& rRedl, bool bBalloon,
     default: break;
     }
 
-    OUStringBuffer sBuf;
-    if (pResId)
-    {
-        sBuf.append(SwResId(pResId));
-        sBuf.append(": ");
-        sBuf.append(rRedl.GetAuthorString());
-        sBuf.append(" - ");
-        sBuf.append(GetAppLangDateTimeString(rRedl.GetTimeStamp()));
-        if( bBalloon && !rRedl.GetComment().isEmpty() )
-            sBuf.append("\n" + rRedl.GetComment());
-    }
+    if (!pResId)
+        return OUString();
+    OUStringBuffer sBuf(SwResId(pResId)
+            + ": "
+            + rRedl.GetAuthorString()
+            + " - "
+            + GetAppLangDateTimeString(rRedl.GetTimeStamp()));
+    if( bBalloon && !rRedl.GetComment().isEmpty() )
+        sBuf.append("\n" + rRedl.GetComment());
     return sBuf.makeStringAndClear();
 }
 
diff --git a/sw/source/uibase/uno/unotxdoc.cxx b/sw/source/uibase/uno/unotxdoc.cxx
index 6fee616c2823..453c06741adb 100644
--- a/sw/source/uibase/uno/unotxdoc.cxx
+++ b/sw/source/uibase/uno/unotxdoc.cxx
@@ -996,8 +996,7 @@ static OUString lcl_CreateOutlineString(const size_t nIndex, const SwDoc* pDoc)
             tools::Long nVal = aNumVector[nLevel];
             nVal ++;
             nVal -= pOutlRule->Get(nLevel).GetStart();
-            sEntry.append( nVal );
-            sEntry.append(".");
+            sEntry.append( OUString::number(nVal) + ".");
         }
     OUString sOutlineText = pDoc->getIDocumentOutlineNodes().getOutlineText(
                 nIndex, pDoc->GetDocShell()->GetWrtShell()->GetLayout(), false);