Prepared by Luu Truong Van 1

KIEM SOAT TIEN TRNH D AN

KIEM SOAT CONG VIEC VA CHI PHVI THI GIAN THEO TUYEN TNH

Tai lieu lu hanh noi bo phuc vu cho lpBoi dng kien thc & ky nang Quan ly d an xay dng - Giang vien: Lu Trng Van, M.Eng

TRUNG TM BI DNG NGHIP V CPATRNG I HC M TP. HCM

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MUC CH

Dien ta cach s dung mot xap x tuyen tnhcua cua mot bo phoi hp cua cac ng congS e : Xac nh tnh trang hien hanh cua d an vi kha

canh ngan sach va tien o. Ngan sach d an va phng sai cua tien o vao

luc ket thuc cong viec.

Tom tat lai cac nh lng co the cho bontnh huong chung thng gap.

Prepared by Luu Truong Van 3

MUC TIEU HOC TAPBiet mot bo d lieu ve cai ban au va cai ang dien ra, chung ta co the xac nh : Tien o hien tai va phng sai cua ngan sach cho

mot goi cong viec n gian Tien o co the co va phng sai cua ngan sach tai

luc hoan thanh cua goi cong viec Xac nh cac ieu chnh trong cong viec va loai chi

tieu e hoan thanh cong viec nh a hoach nhGia nh rang phan khong phang cua cacng cong S co the c bo qua.

Prepared by Luu Truong Van 4

GIA THIET1. Mot d an phc tap co the c phan chia thanh

cac goi cong viec (WP) oc lap va n gian2. WP xem nh khong rut ngan hoac keo dai thi

gian thc hien cong viec, tc la tien trnh congviec la tuyen tnh.

3. So ng cong viec a hoan thanh co the cchnh xac va nhanh chong

4. Ty le chi ph hang ngay cho WP la co the ctnh toan t ty le nhan cong, ty le thue thiet b, tyle vat lieu.

5. Ty le cong viec va chi ph co the c gi co nh.

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V DU: TIEN O BAN AU (AS-PLANNED)

Mot v du thch hp cua WP ma se co nhng anhhng tang toc/giam toc nho la qua trnh thi cong mot san be tong cot thep (BTCT) ln. D an codien tch 50.000 m2, san day 8cm, c thc hien bang thu cong (o BT va trat bang thu cong). Van khuon va cot thep c gia cong tai cho. Ban c lng rang oi thi cong co the lam c 2500m2 san/ngay vi mot chi ph la 3000$/ngay.Ban cung hoach nh e hoan thanh 60.000 m2 san be tong (BT) trong 20 ngay vi chi ph la 60.000$

Prepared by Luu Truong Van 6

V DU: TIEN O ANG THC HIEN (As-Built)

Chu nhiem d an kiem tra tien trnh motcach bnh thng va tm thay:

1. Tai ngay 5,2. 16,000 m2 san BTCT a c hoan thanh

va,3. $ 18,000 a c chi tra.

Prepared by Luu Truong Van 7

TOM TAT BAI TOAN

c lng (Ban au): 20 ngay (Tien o a hoach nh (PS, Planned

Schedule)) 50,000 sf (Cong viec a hoach nh (PW, Planned

Work)) $60,000 (Chi ph a hoach nh (PC, Planned Cost))

Tien trnh d an en hom nay (ang dien ra) 5 days (Tien o thc te (AS, Actual Schedule)) 16,000 sf (Cong viec thc te (AW, Actual Work)) $18,000 (Chi ph thc te (AC, Actual Cost))

Prepared by Luu Truong Van 8

YEU CAU 1

Da vao thu tuc tng t nh a dung ephan tch cac ng cong S:

1. Xac nh mot cach rieng biet tnh trangcong viec hien tai vi moi quan tam entien o va ngan sach

Prepared by Luu Truong Van 9

KET QUA S DUNG PHNG PHAP NG CONG S

$-$5

$10$15$20$25$30$35$40$45$50$55$60

- 5.0 10.0 15.0 20.0

V du ap dung

Ngay

C

h

i

p

h

$

*

1

0

0

0

-

20

40

60

80

100

120

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KET QUA KHI DUNG CAC TY SO HOAC TAM GIAC ONG DANG

4,200

c lng: Thc te:20.0 Ngay - Tien o hoach nh (PS) 5.0 ngay - Thi iem kiem tra (AS)

50,000 m2 san - cong viec hoach nh (PW) 16,000 m2 san BTCT - cong viec thc te (AW)60,000$ $$ - Chi ph hoach nh (PC) 18,000$ $$ - Chi ph thc te (AC)

Thc trang D an cua ban la :Chi ph tien o thc te (ASC) =PC *AS/PS 15,000$ Chi ph theo thi gianPhng sai chi ph (CV) = ASC - AC $ Tien o cong viec la nhanhCVI = ASC/AC 1.28 >1 la tot

Tien o da vao cong viec (SBW) =AW*PS/PW 6.40Phng sai tien o (SV) =SBW-AS 1.40Phng sai ngan sach (BV) =PC *AW /PW 19,200$ Da vao cong viec a lam xongCV = BCWP - ACWP = 1,200$ Cong vec c hoan thanh smCPI = BCWP/ACWP = 1.07 >1 la tot

Prepared by Luu Truong Van 11

YEU CAU 2

Mot vai noi dung vi kiem soat tuyen tnh :

1. Khi xac nh nhng cai rieng biet, tien o vangan sach can c vao s hoan thanh.

2. Xac nh s ieu chnh ty le cong viec (Work Rate Adjustment - WRA).

3. Xac nh s ieu chnh ty le chi ph (Cost Rate Adjustment - CRA)

Prepared by Luu Truong Van 12

KET QUA NHIEM VU 2

Tnh trang hoan thanh d baoChi ph d bao (FC) = AC*PW/AW 56,250$ Chi ph cuoi cungChi ph vt/tiet kiem = PC - FC 3,750$ Tiet kiem ngan sachTien o d bao (FS) = PW *AS/PW 15.63 Ngay hoan thanhTien o nhanh/cham = PS - FS 4.38 Tien o nhanh

Ty le cong viec hien tai (CWR) = AW/AS 3,200 Hien hanhTy le cong viec yeu cau (RWR) = (PW-AW)/(PS-AS) 2,267 Yeu cauHieu chnh WR (WRA) = (RWR-CWR)/CWR -29% Giam toc o thc hien bi:

Ty le chi ph hien tai (CCR) = AC/AS 3,600$ Hien hanhTy le chi ph yeu cau (RCR) = (PC-AC)/(PS-AS) 2,800$ Yeu cauieu chnh CR (CRA) = (RCR-CCR)/CCR -22% Gia tang chi tieu bi:

Prepared by Luu Truong Van 13

BON TRNG HP CO THE GAP

1. Thng gap nhatVt ngan sachCham tien o

2. Thong thngVt ngan sachTien o nhanh

1. Thong thng Tiet kiem ngan sach Cham tien o

t gap nhat Tiet kiem ngan sach Tien o nhanh

Prepared by Luu Truong Van 14

CAC IEM QUAN TRONG CAN NH

Ky thuat nay lam viec tot nhat vi nhng WP ngan han va c nh ngha ro va toc o thchien WP la tang hoac giam khong ang ke.Tien trnh cua cong viec phai c o lng dedang.Thi iem kiem tra (check points) phai c thietlap sm va thng xuyen trong qua trnh xay dng.Thi iem ket thuc a c d bao hau nh co yngha hn la tnh trang hien hanh cua d an