Problem 2: There is little quota for grouting in karst caves below the bottom of pile foundation. It is estimated that there is no quota to apply for, but you can refer to the piling quota, record the concrete quantity, and count the concrete quantity as a visa. You can also consider using the method of pouring concrete for underground continuous wall to modify the actual concrete quantity. It is estimated that the acceptable line may be larger.
There is really no way to make a visa and record the actual labor, machinery and materials. In short, don't lose yourself.
Question 3: How to set the split grouting quota can be calculated with reference to the corresponding subheads of municipal quota, such as Guangdong quota D7-6-7 (compaction grouting reinforcement depth 10m) and D7-6- 12 (compaction grouting reinforcement soil), but the contents of cement and admixture should be adjusted according to the quantity specified in the design of the visa or the construction organization design.
Compaction grouting and split grouting are both effective methods to strengthen weak permeable foundation. The former compacts adjacent soil by slurry bubble, which increases the sum of principal stresses in soil, while the latter compacts adjacent soil by slurry vein network, which reduces compressibility and increases the number of penetration blows. Split grouting, the reinforcement effect can only be seen after pouring a lot of slurry, and the amount of reinforced soil is large. On the contrary, in compaction grouting, small soil can be reinforced by pouring a small amount of slurry. Rapid grouting of thick slurry is an effective method to ensure the compactness of grouting, but it is often converted to split grouting halfway. Split grouting is simple in construction and low in cost, so it cannot be converted into compaction grouting.
Question 4: What is the quota of grouting casing for road reinforcement? Geological drilling rigs used for road reinforcement drill holes with cement slurry, and there is no special quota subtitle for existing civil and municipal quotas. Grouting quota in coal quota can be borrowed, and it can also be priced according to market price.
Photo of foundation reinforcement grouting:
Grouting definition:
It can be divided into ceramic process grouting and construction engineering grouting. Ceramic process grouting is the process of injecting prepared slurry into ceramic production. Construction engineering is a method of injecting some solidified slurry into cracks or pores of geotechnical foundation by appropriate methods, and improving its physical and mechanical properties by means of replacement, filling and extrusion.
Question 5: Who knows whether the grouting price of pile foundation and foundation reinforcement is fixed?
Question 6: Grouting reinforcement of fence foundation, grouting price, Guangdong 10 bidding budget.
The actual tax burden of different types of projects in Hemudu is quite different, so the marketing department of the company should carefully sign the construction contract and fully consider the value-added tax factor. For example, there is almost no deductible input tax for earthwork projects. If the project is located in the deep mountains, and most of the earthwork suppliers are small-scale taxpayers, the tax burden will definitely increase, so it is necessary to leave enough profit margin when compiling the tender budget.
Contract review
When signing a project contract, in addition to the general terms in the contract model, the form and payment method of materials and equipment provided by Party A and how to provide invoices should also be indicated. Party A specifies the subcontracting settlement method and explains how to provide invoices and taxes. Pay special attention here. Except for equipment installation enterprises, it is generally necessary to avoid Party A's requirements for the supply of materials and equipment. The manufacturer, variety and model can be selected by Party A, and the purchase and sale contract is signed by the constructor and the supplier to avoid the lack of input tax. In the management of engineering subcontracting contracts, subcontractors are explicitly required to provide qualified enterprises with special invoices for subcontracting settlement of value-added tax.
Select suppliers
Material purchasing departments or branches can be established within the company as a whole to facilitate the selection of general taxpayers as suppliers and reduce the probability of small-scale taxpayers as suppliers. Under the current business tax system, business tax and surcharges have nothing to do with enterprise cost management, and enterprises may only link cost management with enterprise income tax. However, after the close combination of cost management and turnover tax, enterprises themselves must make good tax planning. For example, in the past, from the price point of view, whether the supplier is a small-scale taxpayer or a general taxpayer, now it is necessary to comprehensively consider from the perspectives of reducing costs and reducing tax burden to reach a balance point.
Subsidiary and project department
After the implementation of the "VAT reform", the actual tax burden of each subsidiary may be different due to the different management level, structure setting, specific business philosophy of the leaders and the degree of emphasis on taxation. Group companies should strengthen the management of molecular companies and project engineering departments, improve the level of project management, and try to absorb the extra cost of choosing ordinary taxpayers as suppliers. The internal control system of the project management department, such as employment, materials (procurement), quality, progress and funds, should be redesigned. Buy all kinds of materials, machinery, services, etc. As far as possible, from the unit that can provide special VAT invoices. Group companies can regularly publish and rank the tax burden of their subsidiaries, urge and encourage subsidiaries to strengthen tax planning, and actively adapt to the tax change of "camp reform".
Accounts receivable control
Before the project bidding, it is necessary to conduct a comprehensive analysis of the feasibility of the project and the availability of funds to avoid arbitrary bidding; After bidding, a detailed account of the performance bond shall be established, and the time and method of the return of the bond must be clear. We must strictly control the funds outside the production and operation of enterprises. For the recovery of accounts receivable, the enterprise can set up a collection team to collect the project payment and project deposit in time to ensure the timely arrival of project funds and the normal progress of the project. At the same time, it is necessary to strengthen the management of fund account opening, and never allow the project leader to open an account in his own name.
funding budget
Due to the different management levels of construction enterprises, the actual tax burden of value-added tax is also different. When paying business tax, when making the capital budget at the end of last year, as long as the income comes out, it is the business tax burden, but the actual tax burden may reach 6%, 8%, and of course it may also be 2% and 3%. Therefore, the financial department should pay close attention to the budget and supervise the flow of project funds and the behavior of relevant responsible persons by means of comprehensive budget management.
evaluation sheet
All kinds of cost ledgers and internal assessment forms of enterprises should be redesigned, and all of them should include VAT input tax. Organize all relevant accounts of the project, which can be designed first, then consulted and finalized.
Internal communication
The internal cost control department of an enterprise should strengthen communication with the financial department regularly (monthly, quarterly and annually), get to know each other all kinds of information in the process of project construction in time, and report to the project management department regularly to further improve the overall profitability of the enterprise.
cost data
Due to the change of cost, it can reflect the change of value-added tax burden and enterprise income tax burden of the actual management level of the enterprise, and all departments of the construction enterprise should carefully analyze and calculate it. The contract budget department will also compare the actual cost of the project with the budget quota, collect information, support the bidding quotation in the future, and finally determine the enterprise management quota.
What kind of response actions should be taken can not be generalized, but should depend on the company's operating conditions, because these decisions ... >>
Question 7: How to quote 60/ m for cement grouting for foundation reinforcement? Now it's 20 13, and the salary has also increased.
Question 8: How to quote for the grouting plugging project? After you and the customer have surveyed the plugging site and given the plugging plan, the overall cost will probably be bottomed out.
If it is a small project, it is calculated according to the number of grouting holes and the number of extended meters;
If it is a large project, the cost will be classified, mainly divided into material cost+plugging tools and spare parts+labor cost+workers' accommodation and other items for quotation.
Question 9: Who should organize the testing of foundation bearing capacity of foundation pit?
The detection of foundation bearing capacity of foundation pit is divided into in-situ test after earthwork excavation and effect detection after foundation treatment.
1. The in-situ test of foundation bearing capacity after earthwork excavation of foundation pit is a test to provide (verify) basis for design. Unless otherwise agreed by both parties to the construction contract, it is generally organized by the construction unit and entrusted by a testing institution with corresponding qualifications for testing.
2. The foundation pit effect detection after construction treatment shall be organized by the constructor, supervised by the supervisor, and entrusted with a testing institution with corresponding qualifications for testing.
1. Code for Design of Building Foundation (GB 50007-20 1 1).
4.2. The engineering characteristics of1soil can be expressed by strength index, compressibility index, resistance of static sounding probe, number of blows in dynamic sounding test, number of blows in standard penetration test and bearing capacity of load test.
4.2.3 The shallow plate load test or deep plate load test shall be adopted for the load test. Shallow plate load test is suitable for shallow foundation, and deep plate load test is suitable for deep foundation. The test requirements of two kinds of load tests shall meet the provisions of Appendix C and Appendix D of this specification respectively.
5.2.3 The characteristic value of foundation bearing capacity can be comprehensively determined by load test or other in-situ tests, formula calculation and engineering practice experience.
6.3.9 The characteristic value of bearing capacity of compacted fill foundation shall be determined according to the results of in-situ tests (static load test, dynamic cone penetration test, static cone penetration test, etc.). ). The characteristic value of the bearing capacity of the top surface of the underlying layer shall meet the requirements of Article 5.2.7 of this specification.
10. 1. 1 The test that provides the basis for the design shall be conducted before the design. Plate load test, static load test of foundation pile, uplift test of foundation pile and uplift test of anchor rod should be loaded to the limit or destroyed. When necessary, the base reaction, deep settlement, pile internal force and pile tip resistance should be tested.
Second, the "Code for Acceptance of Construction Quality of Building Foundation Engineering" GB50202-2002 (excerpt)
4. 1.3 After the foundation construction is completed, it is advisable to conduct quality acceptance at intervals determined by the design.
4. 1.4 Foundation reinforcement project, before the formal construction, the test section should be constructed, and the set construction parameters and reinforcement effect should be demonstrated. For the load test to verify the reinforcement effect, the applied load should not be less than 2 times of the design load.
4. 1.5 For lime-soil foundation, sand-gravel foundation, geosynthetics foundation, fly ash foundation, dynamic compaction foundation, grouting foundation and preloading foundation, the completed results (foundation strength or bearing capacity) must meet the design requirements. The inspection quantity shall not be less than 3 points per unit project, at least every 1000O point for projects above 1 00o point, and at least every1point for projects above 300OO. Each independent foundation shall have at least 1 point, and the foundation trench shall have 1 point every 20 linear meters.
Three, according to the relevant provisions of the quota valuation, the construction engineering quality inspection test fee refers to the general appraisal and inspection fee of building materials, building components and building devices. Including the construction quality witness sampling inspection fees, materials and chemicals consumed by construction enterprises to set up their own laboratories for inspection. It does not include the test fees for new structures and materials, the inspection fees for materials with factory certificates by the construction unit (unless otherwise required by the specification), and does not include the expenses for destructive tests of components and other inspection tests with special requirements. The cost of special inspection of construction project quality shall be agreed in the contract by the construction unit and the testing unit according to the contents and requirements of the project quality inspection, and shall be included in other project construction costs.
Four, the Ministry of construction "construction engineering quality inspection management measures" 14 1 order (excerpt)
Article 4 A testing institution is an intermediary institution with independent legal personality. Testing institutions engaged in the quality testing business specified in Annex 1 of these Measures shall obtain corresponding qualification certificates in accordance with these Measures.
The qualification of testing institutions can be divided into special testing institutions and witness sampling testing institutions according to the testing business they undertake. The qualification standards of testing institutions shall be stipulated in Annex II. A testing institution that has not obtained the corresponding qualification certificate shall not undertake the quality testing business stipulated in these Measures.
Twelfth provisions of the quality inspection business, by the project construction unit entrusted with the corresponding qualification testing institutions for testing. The entrusting party and the entrusted party shall sign a written contract. Article 13 The sampling of quality inspection samples shall strictly implement the relevant national engineering construction standards and regulations, and shall be sampled on the spot under the supervision of the construction unit or engineering supervision unit. Provide ... >>
Question 10: Is there any information on the construction method of double circular shield? I need the causes and corrective measures of corner in double-circle shield construction to write this part of the paper.
Double-circle shield tunneling technology is a brand-new construction technology, and the rotation angle produced by shield machine in the construction process has an extremely important influence on the construction. Through construction practice, the causes of corner are analyzed, and corresponding construction countermeasures are formulated to reduce the various influences brought by corner. The corner rectification measures were applied in the construction of M8 line, which achieved good results and enabled the construction to proceed smoothly.
Key words: Corrective measures for the causes of corner bend in double-circle shield construction technology 1. General situation of the project With the continuous development of urban construction, the number of subway construction lines is also increasing. This puts forward higher requirements for the current subway construction equipment and its supporting construction technology, and it is imperative for the double-circle shield to be put into use. Double-circle shield is very similar to ordinary single-circle shield in appearance, and two tunnels can be completed with one push. 198 1 year, Japan came up with the idea of using DOT for tunnel construction. 1987 carried out the field test of horizontal two-in-one polka dot shield, and successfully registered the patent of polka dot construction method. 1988, field test of longitudinal two-in-one double circular shield was conducted in Japan; 1989, the world's first double-circle shield project was constructed in Hiroshima, Japan. The tunnel between Huangxing Greenland Station and Xiangyin Road Station on M8 line of Shanghai rail transit is the first tunnel in China to be excavated by double-circle shield machine. The joint venture between Shanghai Tunnel Engineering Co., Ltd. and Japan Dafeng Construction Co., Ltd. is responsible for the construction. Excavation of this section of tunnel officially started on August 8, 2003, and was completed on June 65438+February 3 1 day, 2003. Therefore, China has become the second country in the world to use double circular shield machine to complete tunnel excavation. The tunnel in this section is 868m long, and the external dimensions of the tunnel are? Φ Φ 6300mm×10900mm (outer diameter× width), and the center distance of double lines is 4600mm；; The maximum slope of the tunnel is 28‰, the radius of the least square curve is 495m, and the thickness of the tunnel covering soil is 5.2 ~ 12m. The tunnel lining adopts precast reinforced concrete segments, which are assembled by staggered joints. Each ring lining consists of 8 circular segments (a), 1 big gull segment (b), 1 small gull segment (c), 1 cylindrical segment (d) * * *1segment, with a segment thickness of 300. The segments are connected by bolts in the longitudinal direction and the circumferential direction, and waterproof joints are made of water-swellable rubber waterstops.
Second, the control of the rotation angle of double-circle shield In the construction of double-circle shield, the technical measures such as the control of shield axis (plane and elevation) are not much different from those of single-circle shield, but the big difference between double-circle shield and single-circle shield is the deflection of shield. When the single circular shield is advancing, even if it deflects, it will not directly affect the completed tunnel; However, in the process of double-circle shield propulsion, the height difference between the left and right sections and the inclination of the column will directly affect the axis of the tunnel. Axis control (plane and elevation) of shield is a mature construction technology. However, in the corner correction measures, the double circular shield adopts a set of unconventional correction measures. 1, the corner can be divided into two parts: the internal cause is caused by the characteristics of the shield machine itself, and the external cause is caused by the external soil conditions and construction. (1) Left and right differences of shield machine fuselage There are some differences in the left and right structure and equipment configuration of double-circle shield machine fuselage, such as the setting position of pedestrian door and the structure of left and right assembler, which leads to uneven weight of shield machine. (2) Manufacturing accuracy of shield machine In the manufacturing process of double-circle shield machine, if the left and right shells are deformed, it is easy to produce deflection. (3) In the process of double-circular shield propulsion with uneven surrounding soil, due to the inhomogeneity of soil, when the cutter head cuts the soil, the moment of the left cutter head and the right cutter head is different, which leads to the moment difference of the shield machine, thus leading to the deflection of the shield machine; In addition, the shield machine has different soil quality and different foundation bearing capacity, which will also cause shield machine deflection. (4) Curved section construction or deviation correction When the double-circle shield machine is in curved section construction or axis deviation correction, the force and direction on the left and right sides will be different, which will lead to the deviation of the shield machine; In addition, if there is local overbreak, it is easy to cause shield deflection. 2. The adverse impact of the corner of the double circular shield will have a considerable impact on the posture of the shield and segment, the forming quality of the tunnel and the ground settlement. (1) poor posture of shield and segment If the rotation angle generated by double-circle shield machine reaches 0.6 (36'), the left-right elevation difference will be 48mm, while the elevation deviation of ordinary subway tunnel will be 50 mm ... Therefore, once it is larger ... >; & gt