CN1114088C

CN1114088C - Explosion method for demolishing cofferdam

Info

Publication number: CN1114088C
Application number: CN 00124802
Authority: CN
Inventors: 李世海; 徐以鸿; 常玉华; 刘月心
Original assignee: Institute of Mechanics of CAS
Current assignee: Institute of Mechanics of CAS
Priority date: 2000-09-12
Filing date: 2000-09-12
Publication date: 2003-07-09
Anticipated expiration: 2020-09-12
Also published as: CN1342882A

Abstract

The present invention relates to a method for blasting and dismantling a concrete cofferdam, which comprises that a blasting incision is opened by a blasting method on the external side of the cofferdam in the pseudo-dismantling position; the upper part of the cofferdam is instable; the part to be dismantled of the cofferdam is tilted towards the side of the opening under the action of gravity and falls to the root of the external side of the cofferdam; the cofferdam dismantled by tilting turning blasting is once blasting dismantlement of the concrete cofferdam. Compared with other methods, the present invention has the advantages of basically no slag removal or less slag removal amount after blasting, explosive saving, small generated vibration, less pore forming sum than that of loosening blasting, low engineering cost, short construction period and fast construction progress.

Description

A kind of explosion method for demolishing cofferdam

Technical field

The present invention relates to a kind of demolition blasting concrete cofferdam method, particularly adopt and topple over upset demolition blasting roller compacted concrete cofferdam blasting demolishing method.

Background technology

The technology relevant with explosion method for demolishing is the blasting demolishing method of all kinds of rock soil demolition technology, large-sized concrete demolition blasting and building, and related data " is being introduced in engineering explosion handbook one book to some extent.Layering demolition blasting roller compacted concrete cofferdam can be consulted the paper " Yan Tan power station roller compacted concrete cofferdam demolition blasting " on " the engineering explosion collected works " the 5th volume that Li Shihong etc. is published in 1993.Adopting standing, broken large-sized concrete basis and layering blowing up concrete cofferdam all is some routines, mature technology, but all there are quick-fried back scarfing cinder, broken body lumpiness problem in these blasting methods, also have pore-forming expense height, explosive quantity long in time limit, each and total dose bigger in addition, explosion vibration is to problems such as the influence of adjacent buildings are also bigger.So when removing the large-sized concrete cofferdam, propose that a kind of speed of application is fast, the cofferdam is removed in onepull, produce that vibration is little, the simple method of technological operation is very necessary.

Summary of the invention

It is bigger to the objective of the invention is to overcome in the existing demolition blasting concrete cofferdam technology pore-forming expense height, explosive quantity long in time limit, each and total dose, explosion vibration is to problem such as the influence of adjacent buildings is also bigger, thereby provide a kind of saving explosive, it is little to produce vibration, the pore-forming sum is compared less with standing, thereby construction costs is low, once removes, duration is short, the new method that is used for the demolition blasting concrete cofferdam---the explosion method for demolishing that construction speed is fast.

The present invention proposes a kind of demolition blasting concrete cofferdam method---topple over the directional blasting demolishment of upset similar all kinds of buildings of demolition blasting method such as residential building, chimney.As shown in Figure 1, this topples over upset demolition blasting method is to leave an explosion otch in the outside, cofferdam of intending the dismounting position with blasting procedure, make weir, top body unstability, part is waited to remove to opening one inclination in the cofferdam under the gravity effect, fall into to the root in the outside, cofferdam, its specific embodiments is carried out according to the following steps:

1) beat upright opening or inclined hole from weir crest, the bottom, hole surpasses intends removing the position, is perhaps removing position water

Flat pre-buried pore;

2) intending removing position Strap cartridge bag;

3) explosive funnel action index n 〉=0.75 of cartridge bag;

4) leave an explosion otch by the blast action of cartridge bag;

5) will to be full of the center of gravity of removing the cofferdam body be C among Fig. 1 to the explosion otch, and the summit that is moved to otch also

Be outside weir, the top body upset supporting-point B;

6) removing after the position leaves the explosion otch with explosive, weir, top body unstability begins under the gravity effect

Topple over, turn to the root in the outside, cofferdam.The invention has the advantages that: require once to finish as the demolition blasting concrete cofferdam, existing layering is removed inadvisable; Adopt loosening crushing Blasting scheme, when once the cofferdam height degree of Chai Chuing reached tens meters, pore-forming expense and difficulty of construction increased; Behind the demolition blasting, form quick-fried stack height and reach several meters, submarine mechanical is removed quick-fried heap expense height, long in time limit; Each explosive quantity and total dose are bigger, and explosion vibration is also bigger to the influence of adjacent buildings; Block rolling amount downstream is difficult to control, and dismounting back block rolls downstream and the effect of current will produce bigger vibration at the key dam dam foundation.And topple over upset demolition blasting cofferdam is disposable demolition blasting concrete cofferdam, compares after quick-fried fewly without scarfing cinder or scarfing cinder amount basically with other method, saves explosive, it is little to produce vibration, and the pore-forming sum is compared less with standing, and construction costs is low, duration is short, and construction speed is fast.

Description of drawings

The present invention is described in detail for the contrast drawings and Examples now

Fig. 1 is the demolition blasting method principle schematic of toppling over, overturn,

Corresponding upright opening or the inclined hole cloth medicine of 1a figure, 1b schemes the pre-buried pore cloth of corresponding level medicine.1 is the cofferdam among the figure, and 2 is blast with linear charges, and 3 remove for the explosion otch, 4 weir, top bodies for removing, and the weir body of AA line top for removing, B be that body 4 upset supporting-points in weir, top are the summit of explosion otch 3, C is the center of gravity of weir, top body 4.

Fig. 2 is Qingjian River transverse cofferdam section, cartridge bag position profile and quick-fried back sectional drawing.1 is the cofferdam that cuts out by explosion method in advance among the figure, and 2 is blast with linear charges, and 3 is cofferdam, the Qingjian River, and 4 is ground.

The specific embodiment

The demolition blasting method of toppling over, overturn of the present invention is Qingjian River roller compacted concrete cofferdam demolition blasting test; This test is carried out on the roller compacted concrete cofferdam of the Qingjian River.By the presplit blasting explosion cut out one as shown in Figure 2 weir crest be 1.6 meters wide 4 meters long cofferdam section.Because the inhomogeneities and the layered characteristic of roller compacted concrete cut out comparatively difficulty of 1.6 meters wide 4 meters long cofferdam by explosion method in advance, for this reason, test has adopted presplitting and blast to remove the scheme of onepull.Three row's segment blasts are adopted in test, and cartridge bag layout profile is seen accompanying drawing 2.Body the collapse bottom of weir, upstream body in weir, explosion upper back has reached the purpose of removing.Because the inhomogeneities of roller compacted concrete under Blast Loads is not to overturn as a whole after the blast of weir body, but outwards collapses with the form of the block that looses after the fragmentation; Bottom cartridge bag blast partly forms bulge at the cloth medicine, causes that also weir, top body has the motion of horizontal direction simultaneously, and this helps the weir body to collapse; Arrange according to the cartridge bag of this test, can shape slope, the end at 45 after the blast, there is not block to be detained on this slope.Result of the test shows that it is enforceable that method for turning demolition blasting concrete cofferdam is toppled in employing.

Claims

1. explosion method for demolishing cofferdam is characterized in that: carry out according to the following steps:

1). from the weir crest punching, the bottom, hole surpasses intends removing the position, is perhaps removing the pre-buried pore of position level;

2) intending removing position Strap cartridge bag; Explosive funnel action index n 〉=0.75 of this cartridge bag;

3) by leaving an explosion otch at the blast action of the cartridge bag of intending dismounting position institute cloth; Described quick-fried

Broken otch will satisfy the center of gravity C that removes the cofferdam body and be moved to outside weir, the top body upset supporting-point B;

4) removing after the position leaves the explosion otch with explosive, weir, top body unstability begins to topple over, turn to the root in the outside, cofferdam under the gravity effect.

2. by the described explosion method for demolishing cofferdam of claim 1, it is characterized in that: described step 1) is to beat upright opening or inclined hole from the weir crest punching.