A53 lancar & Golek (ERW) Paip keluli
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keluli hitam paip Scaffolding Permohonan

ASTM SAWL API ERW X 52 karbon rendah tahan karat paip keluli yang lancar bagi gas daratan dan saluran paip minyak

Galvanized scaffolding black steel pipe

Permohonan daripada keluli hitam paip Scaffolding

【Abstract】This paper discusses the application of scaffolding on site construction, menerangkan secara terperinci pengiraan sistem sokongan daripada perancah, and compares the situation of two kinds of steel scaffolds commonly used in construction.

paip keluli hitam untuk Scaffolding

1.Detail Information of building ERW black round steel welded pipe dn200

1) saiz : O.D 15–457mm W.T 1–12mm panjang: kerana anda diperlukan. ( L < 12m )
2) komposisi kimia bahan-bahan mentah harta mekanikal bahan-bahan mentah
itemKomposisi kimia %Perkaraharta mekanikal
keluliCMNSPSi kelulititik alah Mpakekuatan tegangan Mpapemanjangan %
BS1387< 0.2< 1.2< 0.045< 0.045< 0.30 BS1387> 195325-46020 (min)
A53 A0.250.950.0450.05 A53 A> 205> 33026–30
A53 B0.31.20.0450.05 A53 B> 240> 41521–26
A500 A D< 0.26< 1.35< 0.035<0.0350<0.30 A500 A D230–250310-40022–26
A500 B C< 0.26< 1.35< 0.035<0.0350<0.30 A500 B C315–345400–42521–22
S235< 0.20< 1.4< 0.040< 0.040< 0.30 S235> 235> 42521–22
S355< 0.22< 1.6< 0.030< 0.030< 0.55 S355> 355470-63021-22
C250< 0.3< 1.2< 0.045< 0.040< 0.30 C25025032025
C350< 0.22< 1.6< 0.035< 0.035< 0.55 C35035043022

3)standard kualiti: A53 | A252 | A572 | A450 A500 | A795|EN 39|BS1139|BS1387| BS6323|

BS10210 |EN10217| BS3602 |EN10219| DIN17100 |DIN1626 |GOST8731 |GOST10704|as1074 |as1163

4) rawatan permukaan: paip keluli tergalvani , mabuk, dicat , terdedah

6) ujian:analisis komponen kimia, sifat-sifat mekanik ,sifat teknikal , pemeriksaan saiz luaran
7)Permohonan:penghantaran .Aras air gas .petroleum, sebahagian fence.construction.mechanical pembuatan perabot
8)sijil: pemeriksaan SGS
9)masa penghantaran: biasanya dalam 20–30 hari
10) tempoh bayaran: T / T , L/C, Western Union
keluli hitam kelengkapan paip karbon logam diulirkan tiub keluli segi empat tepatkeluli hitam kelengkapan paip karbon logam diulirkan tiub keluli segi empat tepatkeluli hitam kelengkapan paip karbon logam diulirkan tiub keluli segi empat tepat

 

2.Here we list the size of sch40 for your reference.

ODSCH40 WT ODSCH40 WT ODSCH40 WT ODSCH40 WT ODSCH40 WT
1/2″2.771-1/4″3.562-1/2″5.164″6.028″8.18
3/4″2.871-1/2″3.683″5.495″6.5510″9.27
1″3.382″3.913-1/2″5.746″7.1112″10.31

saiz lain untuk rujukan anda

mm ODWT mm`mm ODWT mm mm ODWT mm mm ODWT mm
211–2.75732.5–7.01212.5–7.0168.32.75–12
251.7–3.2576.12.5–7.01272.75–11.0177.82.75–12
33.41.9–4.088.92.8–8.01333.25–8.01942.75–12
42.22.0–4.0982.5–4.5139.72.5–10.02033.0–12
48.32.0–7.01022.5–9.01523.25–7.52192.75–12.0
572.3–5.01082.8–9.01592.5–10.0244.54.0–12.0
60.32.0–7.0114.32.5–9.01652.75–7.0273.14.0–12.0
We are the manufacturer of steel pipe.some size not listed here also can be produced.
Kelengkapan dan bebibir juga boleh dibekalkan dan dikimpal. Jika anda memerlukan maklumat lanjut , sila
hubungi kami ,kami akan menghantar maklumat ini dalam masa yang .

 

Introduction

In the construction of bridges, walaupun perancah mempunyai kedudukan penting dalam projek ini, ia perlu dimasukkan dalam reka bentuk organisasi pembinaan unit mengikut keperluan reka bentuk pembinaan, tetapi kini Walau bagaimanapun, ia sering mendapati bahawa tidak ada penerangan yang terperinci tentang reka bentuk organisasi pembinaan banyak unit; jika mereka, they are often very simple and do not meet the actual construction requirements. To ensure the safety of construction, it is necessary to verify the scaffolding.

In the current construction of bridges, terdapat dua jenis perancah yang digunakan lebih kerap: satu adalah pengikat-jenis tiub keluli perancah, and the other is a portal-type steel scaffold. This article mainly introduces the design and calculation methods of these two scaffolds.


Fastener type steel scaffolding

Fastener type steel tubular scaffold is a kind of Black steel pipe scaffold consisting of horizontal cross bar, bar silang membujur, tiang tegak, papan perancah dan gunting, tiang menyapu, asas, pull support and fasteners connecting them.

1. Fastener-style Black steel pipe scaffolding design

The fastener-type Black steel pipe scaffold used in bridge construction is generally used as a formwork frame to withstand the construction load of concrete structures. The load-carrying capacity of fastener-type steel tubular scaffolds is designed according to the requirements of the probabilistic limit state design method and the partial expression design formula. The general calculations are: kekuatan anggota lenturan seperti bar melintang membujur dan melintang dan keupayaan galas anti-gelongsor pengikat bersambung; pengiraan kestabilan tiang; the calculation of the bearing capacity of the foundations of the poles.

(1) Load calculation

In the construction of bridges, beban yang bertindak atas perancah keluli pengikat jenis umumnya beban struktur pembinaan, berat pengendali, the gravity of the construction equipment and the self-gravity of the fastener-type Black steel pipe scaffold. The location and distribution of various loads can be used according to the actual situation. The order of delivery of the fastener-type steel scaffolding scaffolding is: perancah → kayu lintangnya melintang → kayu lintangnya membujur → tiang → pedestals → asas.

(2) Calculation of bending strength of

vertical and horizontal horizontal bars The calculation formula of bending strength of vertical and horizontal horizontal bars is as follows:

d = ≤[f]

m—— bending moment design value

Mendatar dan menegak bar mendatar mempunyai daya dalaman umumnya mengikut tiga rentang. rasuk banyak berterusan momen lentur (jika keadaan khas boleh dikira oleh berbilang rentang rasuk berterusan momen lentur):

W – section modulus.

[f] – Design value of bending strength of steel.


(3) Calculation of
vertical and horizontal horizontal bar disturbance : Vertical and horizontal horizontal bar interference is calculated as follows:
Y = ≤ [u]

u – [r]

– e – modulus elastik keluli i –

vertical and horizontal The moment of inertia of the section of the horizontal rod

q—the equivalent uniform load on

longitudinal and transverse horizontal rods—the length of horizontal and vertical horizontal rods

[u]—the allowable disturbances should be used in the following table.


(4) Anti-sliding bearing capacity of connecting fasteners When calculating

vertical and horizontal horizontal bars and vertical bars, keupayaan galas anti-gelongsor pengikat hendaklah mematuhi formula berikut:

r ≤ [r]

r – menegak dan mendatar bar mendatar daya menegak dihantar kepada tiang tegak (q l *)

[r]——Design value of anti-sliding bearing capacity of fasteners.


(5) Calculation

of the stability of the vertical pole Calculation of the stability of the vertical pole :

≤[f]
n——The axial force of the

vertical pole calculated by the template bracket Design value n=1.2∑ngk+1.4
∑nqk
Σngk - Template dan kurungan Jumlah berat diri, berat diri konkrit yang baru dicurahkan dan daya paksi dihasilkan oleh berat sendiri bar keluli.

∑nqk—The sum of the axial forces generated by the construction workers and the standard value of the construction equipment load and the load standard value generated when the concrete is vibrated. ф ——

The stability factor of the axial compression member should be based on the slenderness ratio λ.
apabila λ>250, ф=7320/λ2

a—the sectional area of ​​the pole.

[f] – Design value of bending strength of steel.

(6) Calculation of the bearing capacity of the foundation of the vertical pole

According to the test results, the curve of the stress at the bottom surface of the load plate and its subsidence is shown in the figure below. It can be seen from the figure that the deformation of the foundation soil under load. If the load stress exceeds p0, the bearing deformation of the foundation will mutate and lose the bearing capacity of the foundation. Oleh itu, tekanan purata permukaan bahagian bawah tiang mesti memenuhi syarat-syarat berikut:

p ≤ [fg]

p - tekanan purata bahagian bawah asas tiang, [fg] —the

nilai reka bentuk kapasiti asas bearing, yang


portal steel scaffold

with the mast, Struktur asas terdiri daripada sokongan cross, menghubungkan rod, tergantung papan perancah jenis tambahan atau bingkai mendatar, mengunci senjata, dan lain-lain. A seragam hitam paip keluli perancah disediakan dengan rod mengukuhkan mendatar, gunting sokongan, rod menyapu, kedap rod, brackets and bases.

1. Design and Calculation

of Portal Steel Tubular Scaffolds The gate steel tubular scaffolds used in bridge construction are generally used as formwork supports to withstand the structural loads of concrete structures (lihat di atas). The carrying capacity of the scaffold also uses a unified design expression of the current structure. That is, kaedah reka bentuk berdasarkan keadaan had kebarangkalian juga digunakan.

Different from fastener Black steel pipe scaffolding, the main failure mode of gantry steel scaffolding is the multi-wave buckling failure of the gantry plane with weak bending rigidity. Due to the basic unit of the gantry scaffold, gantri merupakan struktur rangka. Di bawah tindakan beban pembinaan, the gantry members of the construction layer are subjected to local bending moments in the plane of the gantry. Oleh itu, perancah gantri keluli terutamanya menghantar beban menegak ke asas oleh daya paksi tiang menegak gantri. Apabila beban angin bertindak, momen lentur akan dijana ke arah pesawat daripada gantri, yang juga bergantung pada paksi menegak gantri. The heart formed a couple of moments to resist. In short, the portal Black steel pipe scaffold is mainly subject to axial pressure. Both calculations are mainly performed to evaluate the stability of portal steel scaffolds, dan formula adalah seperti berikut: n

≤ [nd]

n — axial force acting on a portal frame design value

[nd] — design of a steady load capacity of a portal frame value.

2. The calculation of the bearing capacity of the portal steel tubular scaffold is the same as the calculation of the fastener steel tubular scaffold.

p ≤ [fg]

p - tekanan purata pangkal asas tiang,

[fg]nilai --design kapasiti asas bearing,

through the above calculation of the stability of the scaffold and the bearing capacity of the foundation, the theory of safe construction of the scaffold supporting system has been obtained in accordance with.


Door-type scaffolding and fastener-type scaffolding comparison

1, proses pembinaan perbandingan:

Portal scaffolding: 1) pemasangan mudah dan pemasangan, kecekapan kerja-kerja pembinaan; mengenai 2 kepada 3 times the fastener-type scaffolding. 2) Kekuatan relatif pekerja’ labor is relatively low.

Fastener type scaffolding: 1) Ia adalah lebih mudah untuk memasang dan membuka, and the construction efficiency is lower.

2, mendirikan perbandingan ketinggian:

gate scaffolding: mendirikan ketinggian umumnya ≤ 45 meter.

Fastener Scaffolding: Ketinggian ereksi umumnya ≤ 50 meter.

3. Perbandingan Manfaat Ekonomi:

Portal Scaffolding: 1) Use less steel. 2) Terdapat banyak jenis spesifikasi untuk perancah, and one-time investment is large. 3) Scaffolding adalah sukar untuk mengurus dan sukar untuk mengekalkan.
Fastener type scaffold: 1) More steel is used. 2) Small one-time investment in scaffolding.

4. Civilized Construction Compared with

Portal Scaffolding: pemasangan perancah dipiawaikan, arranged neatly and beautifully.

Fastener Scaffold: Scaffolding assembly is acceptable.


Safety construction should pay special attention to the issue

during the use of scaffolding during the prohibition of dismantling cross-support, rod tetulang, sweeping poles and so on. The construction load of the operation layer must meet the design requirements and must not be overloaded.

The site where steel scaffolding is erected must be flat and solid, and drainage work must be strictly performed.

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