CN102635360A

CN102635360A - Freezing pipe pulling method in reinforcing process of freezing-method shield end head

Info

Publication number: CN102635360A
Application number: CN2012101197982A
Authority: CN
Inventors: 辛振省; 张俊兵; 徐建中
Original assignee: China Railway No 3 Engineering Group Co Ltd
Current assignee: China Railway No 3 Engineering Group Co Ltd
Priority date: 2012-04-23
Filing date: 2012-04-23
Publication date: 2012-08-15

Abstract

The invention belongs to the technical field of construction of carrying out tunnel construction freezing to reinforce a ground layer and particularly provides a freezing pipe pulling method in a reinforcing process of a freezing-method shield end head. The invention aims to conveniently and rapidly pull out a freezing pipe on the premise that the reinforcing effect of the ground layer is not basically weakened. The method comprises the following steps of: reinforcing and freezing the shield end head and circularly thawing by salt water; fixing and clamping the end head of the freezing pipe by utilizing a pincers clamping plate; symmetrically arranging a plurality of jacks between the pincer clamping plate and a freezing soil layer and relative to the axis center of the freezing pipe, wherein the quantity of the jacks is more than or equal to two; synchronously jacking each jack and granularly and outwardly pulling out the freezing pipe until the whole freezing pipe is wholly pulled out. The freezing pipe pulling method has the beneficial effects that the heat circulation time is effectively reduced, the freezing quality is guaranteed and the use is convenient and fast; auxiliary works such as repeated overlapping of a scaffold are avoided, the requirement of a work space is small and the adaptability is strong, so that the freezing pipe pulling method is convenient to apply and popularize in a large area, and the economic benefits and the social benefits are very obvious.

Description

Freezing pipe plays draw out method in the freezing process shield end reinforcing process

Technical field

The invention belongs to the technical field of constructing tunnel consolidation by freezing stratum construction, be specifically related to that freezing pipe plays draw out method in a kind of freezing process shield end reinforcing process.

Background technology

The removal method of freezing pipe mainly contained after the construction of existing constructing tunnel consolidation by freezing stratum was accomplished:

The method of

Figure 2012101197982100002DEST_PATH_IMAGE001

long-time thermal cycle.This is the method that a kind of freezing pipe at present commonly used is pulled out, that is, frozen construction utilizes hot salt brine in frigo, to circulate after accomplishing, frozen soil around the freezing pipe is fully melted after, the beginning tube drawing.The main drawback of this method is just can tube drawing after the soil layer that freezed around the freezing pipe needs to melt fully in actual mechanical process; Frozen Soil melting layer scope is big like this; Thawing time is long; And heat to melt the time long, will the large tracts of land dissipate heat, make the consolidation by freezing effect of soil layer reduce greatly.Guaranteed not consolidation effect when causing the great amount of cost waste.Cause great potential safety hazard for follow-up construction.

cripple formula.This also is one of method of pulling out of present freezing pipe, after promptly freezing to accomplish, is the freezing efficiency that guarantees the soil body; Avoiding long-time heat to melt causes soil body freezing strength to descend; Slight heat circulates, is used in the freezing pipe periphery that need pull out at once and sets up scaffold, utilizes electric arc furnaces to pull out.Though this job practices can reduce to a certain extent the heat of freezing pipe is melted influence; But need set up scaffold before pulling out freezing pipe; So original heat is melted and is weakened, and adds that the air negative pressure effect causes freezing pipe to be difficult to pull out, and many times need repeat to set up scaffold at the construction field (site); Operation is loaded down with trivial details, and effect is very undesirable.

Summary of the invention

Goal of the invention of the present invention: under the prerequisite of the consolidation effect that does not weaken the stratum basically, pull out freezing pipe quickly and easily, when guaranteeing consolidation effect and workmanship, make convenient and quick construction safety.

The present invention adopts following technical scheme to realize:

Freezing pipe plays draw out method in a kind of freezing process shield end reinforcing process, it is characterized in that step is following: after shield end is reinforced and freezed to accomplish, carry out the salt solution circulation earlier and thawed 5 ~ 10 minutes; Utilize the clamp plate to fix stuck freezing pipe termination then; The clamp plate and freeze between the soil layer and relatively the freezing pipe axle center be symmetrical set some jack, the quantity of jack is more than or equal to two, each jack rises the top synchronously; Progressively outwards extract freezing pipe, all extracted until whole freezing pipe; Described clamp plate comprises the raising plate of two symmetries; The inboard of two raising plates comprises linkage section I, arc gripping section and the linkage section II that links to each other successively; The upper and lower convexity that all is provided with of linkage section I, arc gripping section and the relative raising plate of linkage section II, the linkage section I of two raising plates is connected through hold-down bolt respectively with the linkage section II.

The present invention has following beneficial effect: effectively reduced the thermal cycle time, the heat time of melting reduced to 5 ~ 10 minutes by original 20 ~ 30 minutes, when having improved operating efficiency; Quality is freezed in assurance, has prevented that effectively heat from spreading in freezing body, has effectively guaranteed to freeze the quality of body; The present invention simultaneously is convenient to use, avoids repeating to set up less important works such as scaffold, and working space requires little; Compliance is strong; High efficiency, the side is all over large-area applications and popularization, and economic benefit and social benefit are fairly obvious.

Description of drawings

Fig. 1 is a floor map of the present invention

Fig. 2 is vertical tube drawing operation elevation

The horizontal tube drawing operation of Fig. 3 elevation

Among the figure: the 1-freezing pipe, the 2-jack, the 3-raising plate, the 4-hold-down bolt, 5-linkage section I, 6-arc gripping section, 7-linkage section II, 8-freezes soil layer.

The specific embodiment

Freezing pipe plays draw out method in the freezing process shield end reinforcing process; Step is following: after freezing to accomplish, carry out the salt solution circulation earlier and thawed 5 ~ 10 minutes, utilize the clamp plate to fix stuck freezing pipe 1 termination then; The clamp plate and freeze between the soil layer 8 and relatively the axle center of freezing pipe 1 be symmetrical set some jack 2; Each jack rises the top synchronously, progressively outwards extracts freezing pipe, is all extracted until whole freezing pipe; Described clamp plate comprises the raising plate 3 of two symmetries; The inboard of two raising plates 3 comprises linkage section I 5, arc gripping section 6 and the linkage section II 7 that links to each other successively; The upper and lower convexity that all is provided with of linkage section I 5, arc gripping section 6 and linkage section II 7 relative raising plates 3, the linkage section I of two raising plates and linkage section II connect 4 through hold-down bolt respectively and connect.Pulling out the elevation of vertical and horizontal frozen pipe distinguishes as shown in Figures 2 and 3.

Claims

1. freezing pipe plays draw out method in the freezing process shield end reinforcing process; It is characterized in that step is following: after shield end is reinforced and freezed to accomplish; Carry out salt solution circulation earlier and thawed 5 ~ 10 minutes, utilize the clamp plate fix stuck freezing pipe (1) termination then, at the clamp plate with freeze between the soil layer (8) and the axle center of relative freezing pipe (1) is symmetrical set some jack (2); The quantity of jack is more than or equal to two; Each jack rises the top synchronously, progressively outwards extracts freezing pipe, is all extracted until whole freezing pipe; Described clamp plate comprises the raising plate (3) of two symmetries; The inboard of two raising plates (3) comprises linkage section I (5), arc gripping section (6) and the linkage section II (7) that links to each other successively; Linkage section I (5), arc gripping section (6) and linkage section II (7) be the upper and lower convexity that all is provided with of raising plate (3) relatively, and the linkage section I of two raising plates is connected through hold-down bolt (4) respectively with the linkage section II.