CN101956373A - Method for preventing box culvert head drop during box culvert jacking construction and used steel ship bow slope - Google Patents

Abstract

The invention discloses a method for preventing box culvert head drop during box culvert jacking construction and a used steel ship bow slope, belonging to the technical field of box culvert jacking construction. The method adopts the technical scheme of arranging the steel ship bow slope fixedly connected with the bottom of a bottom plate of the box culvert on the front end bottom plate of the box culvert. During box culvert jacking, a head-up moment is formed by subgrade reaction produced by pushing away soil on the lower slope by using the ship bow slope, so that the box culvert stays in a head-up state in the jacking process, and the head drop of the box culvert during jacking is prevented. The steel ship bow slope adopts the technical scheme of comprising a bottom steel plate (1) with a straight section and an upward bending arc section and a front steel plate (4) arranged on the front end of the arc section of the bottom steel plate (1) and fixedly connected with the front end. At least one bottom anchoring rib (2) for being fixed on the bottom of the bottom plate of the box culvert is fixedly arranged on the bottom steel plate, and a front reserved rib for being fixed on the front edge of the bottom plate of the box culvert is fixedly arranged on the front steel plate (4).

Description

Prevent method that box culvert is bowed and used steel fore slope in the box culvert jacking construction

Technical field

The present invention relates to the box culvert Construction Technology of With standing Operation, particularly prevent the method that box culvert is bowed in the box culvert jacking construction.The invention still further relates to steel fore slope for preventing that box culvert in the jack-in process " bundle head " from being adopted.

Background technology

The box culvert jacking is widely used in all kinds of engineerings such as railway, highway, municipal administration.In the box culvert jack-in process, can bowing phenomena appear usually because of ground, the place ahead soil body active force or the base plate quality of box culvert own, and be commonly called as " pricking head ", thereby influence the engineering safety quality.

For preventing to prick the appearance of a problem, how the slide plate in box culvert or the working pit is reserved certain slope of facing upward usually, there is one to reserve height when making box culvert eject slide plate earlier.But on softer stratum, the box culvert base plate " is eaten soil " in jacking, still can cause " pricking head " phenomenon to take place, thereby influence the engineering safety quality.Face upward the slope and reserve in slide plate and the prefabricated process of box culvert, its gradient is often uncontrollable, and yielding and go wrong when causing later stage jacking operation, can not effectively control jacking job execution quality on the contrary; Secondly, because of the deadweight of part box culvert is bigger,, in jack-in process,, is easily damaged or destroyed and can't reach and reserve the intention of facing upward the slope because of the mutual extrusion friction in the gradient self insufficient strength that concrete pavement is reserved.

Summary of the invention

At the above-mentioned defective that exists in the prior art, the invention provides a kind of method that can prevent that box culvert is bowed in the jack-in process, the present invention also provides a kind of steel fore slope that can prevent effectively that in jacking construction box culvert from bowing.

Method of the present invention is achieved by the following technical solution:

Prevent the method that box culvert is bowed in a kind of box culvert jacking construction, it is that the steel fore slope of fixedlying connected with box culvert base plate bottom is set under box culvert front end base plate.

The present invention is by being provided with the steel fore slope that is fixed with one with it in the box culvert bottom, make box culvert in jack-in process, the subgrade reaction that produces when utilizing the fore slope that the soil under the slope is pushed away away and form a nose-up pitching moment, make box culvert in jack-in process, be in the new line state, thereby prevent to bow in the box culvert jacking.The steel fore slope that the present invention adopts, in jack-in process, can effectively avoid box culvert base plate fore slope concrete and slide plate concrete directly to act on, prevent to reserve the fore gradient because of concrete damages to influence, can keep box culvert and in jack-in process, remain a kind of controllable state, effectively prevent the bundle problem in the box culvert jack-in process.

Described steel fore slope comprises the end steel plate with segmental arc that a straight section and is bent upwards, the front spring that is located at end steel plate segmental arc front end and fixedlys connected with it, be installed with at least one on the end steel plate and be used for and the fixing end anchor rib in box culvert base plate bottom, be installed with at least one on the front spring and be used for and the fixing preceding reserving rib in box culvert base plate forward position.

In order to guarantee reliable connection, anchor rib of the described end and preceding reserving rib are anchored in the box culvert base plate.

The radian of the segmental arc of end steel plate can suitably be adjusted according to actual needs among the present invention.

The technical scheme that box culvert jacking of the present invention is adopted with steel fore slope is: steel fore slope is used in a kind of box culvert jacking, it comprises the end steel plate with segmental arc that a straight section and is bent upwards, the front spring that is located at end steel plate segmental arc front end and fixedlys connected with it, be installed with the end anchor rib that at least one is used for and box culvert base plate bottom is fixing on the end steel plate, be installed with on the front spring and be used for and preceding reserving rib that box culvert base plate forward position is fixing.

The present invention can make end steel plate be anchored in box culvert base plate bottom by end anchor rib and preceding reserving rib being connected with design reinforcing bar in the box culvert base plate and being anchored in the box culvert base plate when practical application.

End steel plate among the present invention can adopt various connected modes to be connected with front spring, and reliable in order to guarantee in the jack-in process to connect, end steel plate and front spring preferably are made as one or one is made, and for example can adopt to weld or by monoblock steel plate mechanical compression molding.The radian of the segmental arc of end steel plate can suitably be adjusted according to actual needs.

The invention has the beneficial effects as follows: the present invention is by being provided with the steel fore slope that is fixed with one with it in the box culvert bottom, utilize the subgrade reaction that the fore slope produces when soil pushes away away under the slope and the nose-up pitching moment that forms, prevent to bow in the box culvert jacking, the technical problem that it efficiently solves the box culvert bundle head that exists in the jacking construction has guaranteed engineering construction quality; Secondly, steel fore of the present invention slope is simple in structure, be easy to make, the employing steel plate is made, sturdy and durable, can effectively avoid box culvert underplate concrete and slide plate concrete directly to act on and the influence reservation fore gradient, guarantee that effectively the fore gradient is not damaged in the jack-in process, and can keep box culvert and in jack-in process, remain a kind of controllable state, effectively prevent the bundle problem in the jack-in process.

Description of drawings

Fig. 1 is the front view on steel fore slope;

Fig. 2 is the vertical view of Fig. 1;

Fig. 3 is the connection diagram of steel fore slope and box culvert;

Among the figure, 1, end steel plate, 2, end anchor rib, 3, preceding reserving rib, 4, front spring, 5, the box culvert base plate.

The specific embodiment

The present invention is further illustrated below in conjunction with accompanying drawing and non-limiting embodiment:

Shown in accompanying drawing 1-3, box culvert jacking shown in the present embodiment comprisesend steel plate 1,front spring 4 with steel fore slope,steel plate 1 employing in the end has certain thickness steel plate and processes, it has the segmental arc that a straight section and is bent upwards, wherein, the radian of segmental arc can suitably be adjusted according to actual needs, being fixed with at least one on theend steel plate 1 is used for and the fixing end anchor rib 2 in boxculvert base plate 5 bottoms, end anchor rib 2 can adopt reinforcing bar, its quantity is decided according to the design needs, and end anchor rib 2 can adopt the mode of welding to fix with end steel plate 1.Front spring 4 is arranged on the front end ofend steel plate 1 segmental arc, it adopts certain thickness steel plate to process, itself andend steel plate 1 can be welded as a whole by the mode of welding or by monoblock steel plate mechanical compression molding,front spring 4 is provided with at least one and is used for and the fixing preceding reservingrib 3 in boxculvert base plate 5 forward positions, preceding reservingrib 3 can adopt reinforcing bar, its quantity is decided according to the design needs, and itself andfront spring 4 can be by the mode firm welding of welding.End steel plate 1 andfront spring 4 form has the prow shape structure of certain sloped of upstroke.End anchor rib 2 is mainly used in firm being anchored on the box culvert base plate of fore slope steel plate with preceding reservingrib 3.

Using method of the present invention: when box culvert is prefabricated, process steel fore slope in advance, after sliding plate lubricant coating is finished, directly lay on it and location.In the box culvert reinforcing bar binding, with design reinforcing bar firm welding in end anchor rib 2 and preceding reservingrib 3 and the box culvert, box culvert formwork erection concreting makes it to form one then.After the casing concrete strength reaches designing requirement, can begin jacking construction.The shoveling plane exceeds box culvert baseplate bottom surface 3～5cm in the jacking, steel fore slope can effectively avoid base plate fore slope concrete and slide plate concrete directly to act in jack-in process, prevent to reserve the fore gradient because of concrete damages to influence, can keep box culvert and in jack-in process, remain a kind of controllable state, effectively prevent the bundle problem in the box culvert jack-in process.

The foregoing description only is used for explanation of the present invention, is not to its restriction, and those skilled in the art also can make a change on this basis.

The present invention is simple in structure, is easy to processing, can effectively solve the technical problem of the box culvert bundle head that exists in the jacking construction, has guaranteed engineering construction quality, can be widely used in all kinds of box culvert jacking constructions such as railway, highway, municipal administration.

Claims (5)

1. prevent the method that box culvert is bowed in a box culvert jacking construction, it is characterized in that: the steel fore slope of fixedlying connected with box culvert base plate bottom is set under box culvert front end base plate.

2. prevent the method that box culvert is bowed in the box culvert jacking construction according to claim 1, it is characterized in that: described steel fore slope comprises the end steel plate (1) with segmental arc that a straight section and is bent upwards, the front spring (4) that is located at end steel plate (1) segmental arc front end and fixedlys connected with it, be installed with at least one on the end steel plate (1) and be used for and the fixing end anchor rib (2) in box culvert base plate bottom, be installed with at least one on the front spring (4) and be used for and the fixing preceding reserving rib (3) in box culvert base plate forward position.

3. prevent the method that box culvert is bowed in the box culvert jacking construction according to claim 2, it is characterized in that: anchor rib of the described end (2) and preceding reserving rib (3) are anchored in the box culvert base plate.

4. steel fore slope is used in a box culvert jacking, it is characterized in that: it comprises the end steel plate (1) with segmental arc that a straight section and is bent upwards, the front spring (4) that is located at end steel plate (1) segmental arc front end and fixedlys connected with it, be installed with the end anchor rib (2) that at least one is used for and box culvert base plate bottom is fixing on the end steel plate (1), be installed with on the front spring (4) and be used for and preceding reserving rib (3) that box culvert base plate forward position is fixing.

5. steel fore slope is used in box culvert jacking according to claim 3, it is characterized in that: steel plate of the described end (1) is made as one with front spring (4) or one is made.

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