Question 2: What's the difference between digging general earthwork and digging trench earthwork? The difference between digging general earthwork and digging trench earthwork shall be implemented according to the quota. Different provinces have different quotas, and the division between construction projects and municipal projects is also different. Taking the quota of Inner Mongolia Autonomous Region in 2009 as an example, it is explained as follows for reference:
(a), construction engineering
The quantities of pipe trench, foundation pit and earthwork shall be calculated according to the following provisions.
1, the division of groove and foundation pit:
(1) If the width of the trench bottom is less than 3m, and the length of the trench is more than 3 times the width of the trench, the excavation project is a trench.
[2] The foundation pit with the pit bottom area (excluding the working face) within 20m2 is the foundation pit.
(2), municipal engineering
Division of trench, foundation pit, leveling ground and general earthwork: the bottom width is less than 7m, and the bottom length is more than 3 times of the bottom width, which is calculated as trench; If the bottom length is less than 3 times of the bottom width, the foundation pit quota shall be implemented within the bottom area of 150m2 according to the calculation of foundation pit. In-situ excavation and filling with a thickness of less than 30cm shall be calculated as flat site. More than the above range of soil, stone according to the excavation and stone calculation.
Question 3: The difference between trench excavation, foundation pit and earthwork is defined by the relevant departments in different fields, and its scope of application is different, which is determined by the budget quota of the local industry. It is not defined by the national standard, it is recognized by the administrative department in this field, and it is also recognized by the state respectively, so the inconsistency is normal. The definitions of municipal engineering and civil engineering may also be different. At the same time, the construction technology is also inconsistent with the project budget, such as deep foundation pit. Now the basement foundation pit of this building is much larger than 150m2.
Question 4: What quota should be applied to trench excavation (including sand and gravel)? The soil in the trench contains sand and gravel, so the soil type should be reasonably classified according to its hardness.
For miscellaneous fill, it is suggested to dig three kinds of soil grooves; If it is an undisturbed mountain, it is suggested to dig four types of soil ditches.
Question 5: Which quota is set for trench excavation? Trench earthwork is listed separately according to trench excavation.
Question 6: How to set the amount of mining (novices ask for advice) is different. The top one will do, and so will the bottom one. Trying to drain the rest is the same as transporting the rest of the soil abroad.
Question 7: What is the earthwork quota of the foundation trench and the list of excavated earthwork in Guanglianda Middle School? Set this quota. If it is manual excavation, it is set to trench excavation, and it is set to backhoe excavation when the engineering quantity is large.
Municipal engineering set corresponding municipal quota.
Question 8: What is the earthwork quota for cable excavation? A chapter on cables in the second volume of Fujian Province says: 6. The excavation and filling of cable trench and electric pipeline trench shall comply with the relevant quota in Chapter 10 of this book. Chapter 10 10KV Overhead Distribution Lines. You can check your local quota report.
This quota shall be subject to manual excavation. For mechanical excavation, please refer to the quota of excavation and filling by civil machinery. It's just that the digging and filling price of civil engineering machinery seriously deviates from the market.
Question 9: When digging ditches and earthwork, should the quantities of the items in this list be different from those of the fixed sub-items under this list? If it is a tender, there is no need to consider the difference between the list quantity and the quota quantity. The list quantity of trenching is a fixed quantity. Due to the inconsistency of calculation rules, it is necessary for the tenderer to consider the difference between the list quantity and the quota quantity. You just need to set the price according to the list when bidding.
If it is a tender, then you need to consider the working face, slope setting and so on. When drawing a graph in the graph calculation, make the list quantity consistent with the quota quantity, and then set the price in the pricing software.
Question 10: How to apply the 5-point quota method when digging trench earthwork with Larsen steel sheet pile in municipal engineering;
Sit down accordingly. Find the content of number of quota that you need to set first. 2. Understand the composition of the reserve price. The base price in the quota is labor+materials+machinery. (Please indicate the unit) Now it is the consumption quota, and consumption is the loss. The quota book clearly indicates the loss of different materials in each kind, and the unit price * material loss is the fixed price of the material. 3. Basic price conversion. If a certain price change of labor, materials and machinery requires base price conversion, then the original changed price is deducted from the base price, and the changed price is added to form a new price ~ but the loss will not change.
Design data
1 pile top elevation H 1: 4. 100 m
Construction water level H2: 3.000m.
2 Ground elevation H0: 4.350m.
Elevation of excavation bottom H3:-3.400m.
Excavation depth h: 7.7500m.
3. Soil bulk density plus total average value γ 1: 18.3kn/m3.
The floating bulk density of soil is γ′:10.0kn/m3.
The total average value of internal friction angle Ф: 20.10.
4 uniformly distributed load q: 20.0kn/m2
5 excavation length a = 20.0m, and excavation width b = 9.0m
Second, the external force calculation
1 Earth pressure intensity and pressure distribution diagram acting on sheet piles
ka = tg2(45-φ/2)= tg2(45-20. 10/2)= 0.49
KP = tg2(45+φ/2)= tg2(45+20. 10/2)= 2.05
The height h of that fil soil is converted by the uniformly distribute load on the outer side of the sheet pile,
h = q/r = 20.0/ 18.3 = 1.09m
Earth pressure intensity above pile top Pa 1
pa 1 = r×(h+0.25)Ka = 18.3×( 1.09+0.25)×0.49 = 12.0 kn/m2
Water level earth pressure intensity Pa2
Pa2=r×(h+4.35 -3.00 )Ka
= 18.3×( 1.09+4.35-3.00)×0.49 = 2 1.8 kn/m2
Earth pressure intensity Pa3 on excavation face
pa3 =[r×(h+4.35-3.00)+(r-rw)(3.00
+3.40)}Ka
=[ 18.3×( 1.09+4.35 -3.00 )+( 18.3- 10) ×(3.00
+3.40)]
× 0.49 = 47.8kN/m2
Water pressure on excavation surface (after cofferdam pumping) Pa4:
pa4 =γ(3.00+3.40)= 10×(3.00+3.40)= 64.0 kn/m2
3. Determine the number and spacing of internal supports.
Type Ⅲ steel sheet piles supported on each floor are determined according to the equal bending distance arrangement.
The maximum bending distance that can be endured determines the maximum allowable span h of the cantilever end of the sheet pile top;
The bending section system WZ0 = 0.00 1.350m3, and the reduction coefficient β=0.7.
The value wz = β wz0 = 0.00135× 0.7 = 0.000945m3.
Allowable tensile strength [σ] = 200000.0kpa
According to the formula σ=M/Wz:
Maximum bending moment m0 = wz× [σ] =189.0kn * m.
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