CN1260503C - Construction technology of relay jacking for glass fiber reinforced plastics sand-inclusion pipe-jacking and apparatus of device thereof - Google Patents

Abstract

Disclosed is a construction technique of mechanical jacking between intermediate pipe jacking with sand-filled glass fiber reinforced plastics and the intermediate device thereof. The device is to install a widened pressure equalizing steel ring at the end of the front and rear glass fiber reinforced plastic sand-filled jacking pipes in the steel sleeve of the relay room. The inner walls of the front and rear glass fiber reinforced plastic sand-filled jacking pipes are fixed to ensure that the relay jacks evenly distributed between the front and rear widened pressure equalizing steel rings can work normally. The key point of this process is to use the above-mentioned device to carry out relay jacking on the glass fiber reinforced plastic sand-filled pipe. After the current root jacking pipe is in place, the jack in the relay room will start jacking. After the jacking is completed, release the cylinder of the jack in the relay room. Make the jack in the relay room at the back continue to jack, and so on, until the front jacking pipe is completely in place; then remove the subsequent relay room components, seal the installation hole on the steel sleeve of the relay room, and use The main jack or the jack between the relays at the back will continue to jack the rear jacking pipe to fill the gap occupied by the original relay.

Description

Construction technology and relay room device of mechanical jacking in relay room of glass fiber reinforced plastic pipe jacking

                    

The invention relates to the pipe jacking technology in underground pipeline engineering, in particular to a construction technique of mechanical jacking between intermediate pipe jacking with glass fiber reinforced plastic and sand and an intermediate device thereof.

Background technique

As a non-excavation underground pipeline construction method, pipe jacking construction can easily lay underground pipelines across roads, railways, houses, rivers, etc. It has little impact on traffic, less excavation and high mechanization. It is a modern underground pipeline laying method, and more and more underground projects adopt this construction method. However, in the traditional concrete pipe and steel pipe jacking construction technology, there are still many problems to be solved urgently, the more important ones are soft foundation countersunk, difficulty in deviation correction, etc. In addition, the corrosion resistance of these two pipes is relatively poor The service life is relatively short, which also restricts the further development of pipe jacking construction technology.

In order to solve the above problems, glass fiber reinforced plastic sand pipes have been gradually used to replace traditional concrete pipes and steel pipes in the current pipe jacking construction. Due to the smooth and dense appearance of the FRP pipe with sand inclusions, small roughness of the inner wall, light weight, and corrosion resistance, compared with traditional pipes, it has the advantages of small jacking force, small pipe diameter at the same flow rate, easy deviation correction, no sinking, and easy to use. Because of its long service life and other advantages, it has received extensive attention from the engineering and technical circles since it began to be applied in pipe jacking projects.

Although the FRP pipe jacking with sand inclusion has the characteristics of smooth outer wall and small jacking force, the maximum jacking distance of a single pit is much larger than that of steel pipe and concrete pipe jacking. However, sometimes due to the limitation of the engineering environment or due to other requirements and considerations, the required one-time jacking distance is very large, so the required jacking force is also very large. This will cause the following problems:

For one, the main jack simply cannot provide the required jacking force. The jacking force that the main jack can provide is certain, and when the jacking force reaches a certain limit, the jacking force provided by the main jack will not be able to continue to increase, then the pipe jacking construction will not be able to continue, and the entire project may be scrapped.

Second, the back wall is not strong enough and destroyed. The back wall supports the jack and bears the reaction force of the jack. It also has a certain strength limit during design. The jacking force cannot exceed a certain value, otherwise it will be damaged and the construction will not proceed.

Third, exceeding the bearing capacity of the pipe leads to damage to the pipe. No matter what the material is, it has only a certain load-bearing capacity, and the FRP sand-filled pipe is no exception. When the jacking force exceeds this load-bearing capacity, the pipe will be damaged.

In order to reduce the jacking force, the entire jacking length can be divided into several sections, and the jack and its corresponding equipment are preset inside the pipeline in each section, and the relay jacking of each jack is carried out. After the jack of the previous section is in place, The jacks in the back section start to jack in, and after the jacks in the back are in place, the jacks in the front go forward again, and so on, and finally complete the entire jacking process. Because each intermediate jack only needs to push into the section where it is located, each intermediate jack does not need too much jacking force, and the main jack only needs to jack into the last section, and the required jacking force will be greatly reduced. This segmented relay jacking method is called relay indirect force jacking, and the related equipment used to place the jack in the middle is called the relay room.

Concrete pipe jacking has used a relay room, but it cannot be directly applied to FRP pipe jacking with sand. The main reason is that the concrete pipe is a thick-walled pipe, and its wall thickness can usually reach one-tenth of the diameter. The jack can directly act on it. However, the FRP sand-filled pipe is a thin-walled pipe, and its wall thickness is less than one-third of the concrete pipe. If the jack acts directly on it, the jacking force will not be fully applied, and it will cause uneven force, making the FRP clamp The sand tube is damaged under a small jacking force.

In addition, after the jacking of concrete pipe jacking is completed, concrete filling is mainly used to seal the relay room, which is not advisable for FRP pipe jacking with sand. If it is still sealed with concrete, if it is thin, that is, it is equivalent to the wall of the FRP sand-filled pipe, the construction may be more difficult, and some other mechanical properties and sealing performance will be worse than the FRP sand-filled pipe section; It will cause a sudden change in the diameter of the pipe and affect the water flow; if it is sealed with glass fiber reinforced plastic, the cost will be too high. Therefore it is necessary to improve it thoroughly.

Contents of the invention

The object of the present invention is to provide a relay indirect mechanical jacking construction technology and relay room device for FRP pipe jacking, which can effectively overcome the defects existing in traditional pipe jacking construction and is suitable for FRP pipe jacking. construction, greatly increasing the one-time jacking distance of FRP sand-filled pipe jacking.

In order to achieve this goal, the indirect force jacking construction technology of FRP pipe jacking with sand inclusions designed by the present invention includes the following procedures:

1) Set the O-shaped rubber sealing ring in the sealing ring groove on the outer wall of the tail of the front FRP sand-filled jacking pipe, fix the steel backing plate vertically on the inner wall of the front section of the steel sleeve in the relay room, and then place the relay room The front section of the steel sleeve is tightly inserted into the tail of the front FRP sand-filled pipe, and the front of the steel backing plate is in close contact with the tail end of the front FRP sand-filled pipe;

2) Place the widened pressure equalizing steel ring close to the back of the steel backing plate in the steel sleeve of the relay room, and fix the stiffening rib on the inner edge of the widened pressure equalizing steel ring to the front glass fiber reinforced plastic On the inner wall of the tail of the sand-filled pipe jacking, and then hoist the front glass fiber reinforced plastic sand-filled pipe into the working pit for jacking;

3) After the front glass fiber reinforced plastic sand-filled pipe is jacked, several inter-intermediate jack cylinders are evenly distributed on the circumference of the widened pressure equalizing steel ring connected to it, and each inter-intermediate jack cylinder is installed on the inter-intermediate jack cylinder with a fixing device. on the inner wall of the inter-steel sleeve;

4) Set the O-shaped rubber sealing ring in the sealing ring groove on the outer wall of the head of the glass fiber reinforced plastic sand-filled jacking pipe at the rear root, and place the widened pressure equalizing steel ring closely on the head end of the glass fiber reinforced plastic sand-filled sand jacking pipe at the back root, and place the The stiffening ribs on the extended edge of the widened pressure equalizing steel ring are tightly fixed on the inner wall of the head of the rear FRP sand-filled pipe, and then the rear FRP sand-filled pipe is hoisted into the working pit and inserted into the relay The rear section of the inter-steel sleeve, so that the widened pressure equalizing steel ring at the first end is in close contact with the jack between the relays, and relay jacking is carried out, and so on;

5) After the front fiberglass-reinforced sand-filled pipe is jacked in place, the jack in the relay room behind it starts to jack in. After the jacking is completed, loosen the throttle valve of the cylinder of the jack in the relay room so that the relay room further behind The jack continues to push in, and so on in a cycle until the front glass fiber reinforced plastic sand-filled pipe is completely pushed into place;

6) After the front glass fiber reinforced plastic sand-filled jacking pipe is fully jacked into place, remove the jack cylinder in the relay room, the front and rear widened pressure equalizing steel rings in sequence, and replace the jack cylinder on the steel sleeve in the relay room. Install nut holes for sealing;

7) Use the main jack or the relay jack at the back to continue jacking the rear FRP pipe with sand to fill the gap occupied by the original relay.

The relay room device specially designed to realize the above-mentioned construction technology includes the steel sleeve of the relay room. At the head of the sand-filled pipe jacking, O-shaped rubber sealing rings are respectively provided at the front and rear joints. There is a steel backing plate close to the tail end of the front fiberglass reinforced sand jacking pipe, and the steel backing plate is vertically fixed on the inner wall of the steel sleeve in the relay room. On the back of the steel backing plate and the head end of the rear glass fiber reinforced plastic sand-filled jacking pipe, there are respectively widened pressure equalizing steel rings, and stiffening ribs are arranged on the inner extending edges of the widened pressure equalizing steel rings, and the front and rear widening are uniform. The stiffening ribs on the pressure steel ring are respectively closely attached to and fixed on the inner walls of the front and rear FRP sand-filled pipe jacking. Between the front and rear widened pressure equalizing steel rings, there are several jack oil cylinders that drive the telescopic jacks in the relay room evenly distributed along the direction of the ring.

The advantage of the present invention is that: the widened pressure equalizing steel ring designed in construction relies on the stiffening ribs on its inwardly extending edge, and is tightly connected to the inner wall of the glass fiber reinforced plastic sand-filled jacking pipe. On the one hand, it can ensure that the jack in the relay room Supported on the widened pressure equalizing steel ring, the jacking force of the jack between the relays can be fully exerted. On the other hand, the force transmission area is increased by widening the pressure equalizing steel ring, which effectively overcomes the thin wall of the FRP sand-filled jacking pipe. The weakness of the FRP sand-filled pipe can make the force of the FRP pipe jacking tend to be uniform, and at the same time, the force can be more reasonable through the stiffener plate fixed on the inner wall of the FRP sand-filled pipe. During the construction, the steel backing plate vertically fixed on the inner wall of the steel sleeve in the relay room is always in contact with the rear end of the front glass fiber reinforced plastic sand jacking pipe during the jacking process, which ensures that the steel sleeve in the relay room is in contact with the front end. The first FRP sand-filled jacking pipe is always jacked synchronously, and there is a certain gap between the steel sleeve in the relay room and the widened pressure-equalizing steel ring on the rear FRP sand-filled pipe, so that the relay can be relayed under the action of the jack. The room can be freely expanded and contracted. In the later stage of construction, after dismantling the relevant components of the relay, the end faces of the front and rear glass fiber reinforced plastic sand-filled jacking pipes can be kept in close contact through the jack, thereby avoiding the trouble of filling after taking out the components between the relays, and greatly saving Construction costs. It can be seen that the construction technology and device of the present invention have successfully solved the problem of indirect mechanical jacking construction of thin-walled FRP sand-filled pipe jacking construction, and can greatly increase the one-time jacking distance of FRP sand-filled pipe jacking.

Description of drawings

Figure 1 is a schematic diagram of the structure of the FRP pipe jacking relay room before jacking;

Figure 2 is a schematic diagram of the structure of the FRP pipe jacking intermediate device after jacking;

Fig. 3 is a structural schematic diagram of the piece-assembled widened pressure equalizing steel ring in Fig. 1 and Fig. 2 .

Detailed ways

As shown in the figure, the FRP pipe jacking relay room device of the present invention has a relay room steel sleeve 1 connecting the front and rear pipe jacking, and the front and rear sections of the relay room steel sleeve 1 are respectively sleeved on the front glass fiber reinforced plastic tube. Two O-shaped rubber sealing rings 8 are respectively provided at the front and rear joints of the tail of the sand-filled pipe 10 and the head of the rear glass-steel sand-filled pipe 9 . Because the deflection correction of pipe jacking may cause a certain deflection angle at the pipe joint, when the groundwater level is high and the water pressure is high, if only a general steel collar or a rubber ring is used to prevent seepage, the effect is often not very good , Therefore, the use of this double O-shaped secondary sealing structure can ensure the anti-seepage effect. A steel backing plate 2 is closely attached to the tail end of the front glass fiber reinforced plastic sand-filled pipe 10, and the steel backing plate 2 is vertically welded on the inner wall of the steel sleeve 1 between the relays. Widened pressure equalizing steel rings 3 are respectively installed on the back of the steel backing plate 2 and the head end of the rear glass fiber reinforced plastic sand-filled jacking pipe 9, and vertical stiffeners 5 are welded on the inner extending edge of the widened pressure equalizing steel ring 3, The stiffening ribs 5 on the front and rear widened pressure equalizing steel rings 3 are respectively installed on the inner walls of the front and rear FRP sand-filled pipes 10 and 9 by fixing bolts 4 . The above-mentioned widened pressure equalizing steel ring 3 is a sub-assembly structure for easy disassembly. It is composed of six hollow arc-shaped plates through connecting bolts 12 to form a whole ring. When you're done, it can be easily disassembled. Between the front and rear widened pressure equalizing steel rings 3, there are four telescopic jack cylinders 7 that drive the jack 11 in the relay room, and the jack cylinder 7 is installed on the steel sleeve in the relay room through two fixing devices 6. On the inner wall of the middle section of cylinder 1. The insertable length of the above-mentioned rear glass fiber reinforced plastic sand-filled jacking pipe 9 matches the length between the steel backing plate 2 and the rear end of the steel sleeve 1 in the relay room, that is to say, the rear socket of the steel sleeve 1 in the relay room The lengthening design has been done simultaneously with the first section insertion part of the glass fiber reinforced plastics sand inclusion jacking pipe 9 of the rear root. In this way, in the pipe jacking construction, no matter how long the jack in the relay room extends, on the one hand, the steel sleeve 1 in the relay room can be freely extended, and its double O-shaped rubber sealing ring 8 is always kept in the steel sleeve in the relay room. In the cylinder 1, on the other hand, after disassembling the relay room components, the end faces of the front and rear FRP sand-filled pipes 10 and 9 can be kept in close contact, avoiding the trouble of filling after taking out the relay room components, thereby reducing cost.

When adopting the above-mentioned device for the indirect mechanical jacking construction of the FRP pipe jacking relay of the present invention, the following procedures are carried out:

1) Set the double-channel O-shaped rubber sealing ring 8 in the sealing ring groove on the outer wall of the tail of the front FRP sand-filled jacking pipe 10, and weld the steel backing plate 2 vertically on the inner wall of the front section of the steel sleeve 1 in the relay room, Then the front section of the steel sleeve 1 in the relay room is tightly inserted into the tail of the front glass fiber reinforced plastic sand-filled pipe 10, and the front of the steel backing plate 2 is in close contact with the tail end of the front glass fiber reinforced plastic sand-filled pipe 10;

2) Put the widened pressure equalizing steel ring 3 close to the back of the steel backing plate 2 in the steel sleeve 1 in the relay room, and weld the stiffener plate 5 on the inner edge of the widened pressure equalizing steel ring 3 Use fixing bolts 4 to closely install on the inner wall of the tail of the front FRP sand-filled pipe 10, and then hoist the front FRP sand-filled pipe 10 into the working pit for jacking;

3) After the front glass fiber reinforced plastic sand-filled pipe 10 is jacked in, four jack cylinders 7 between relays are evenly distributed on the ring of the widened pressure equalizing steel ring 3 connected to it, and two fixing devices 6 are used to connect each relay The inter-jack oil cylinder 7 is installed on the inner wall of the inter-intermediate steel sleeve 1;

4) Set the double-channel O-shaped rubber sealing ring 8 in the sealing ring groove on the outer wall of the head of the rear glass fiber reinforced plastic sand-filled pipe 9, and place the widened pressure equalizing steel ring 3 closely on the rear root glass fiber reinforced plastic sand-filled pipe 9 and the stiffening rib plate 5 welded on the extended edge of the widened pressure equalizing steel ring 3 is tightly installed on the inner wall of the head of the back root glass fiber reinforced plastic sand-filled pipe 9 with the fixing bolt 4, and then the back root glass fiber reinforced plastic clip The sand top pipe 9 is hoisted into the working pit, and inserted into the rear section of the steel sleeve 1 in the relay room, so that the widened pressure equalizing steel ring 3 at the head end is in close contact with the jack 11 in the relay room, and relay jacking is carried out. so repeated;

5) After the front glass fiber reinforced plastic sand-filled pipe 10 is jacked in place, the relay jack 11 located behind it starts jacking, and after the jacking is completed, loosen the throttle valve of the cylinder of the relay jack so that the intermediate jack further behind The jack continues to jack up, and so on, until the front glass fiber reinforced plastic sand pipe is fully jacked into place;

6) After the front glass fiber reinforced plastic sand-filled pipe 10 is fully jacked into place, the jack cylinder 7 in the relay room, the front and rear widening and equalizing steel rings 3 are removed in sequence, and the steel sleeve 1 in the relay room is removed in sequence. The jack cylinder mounting nut hole on the cylinder is sealed;

7) Use the main jack or the relay jack at the back to continue jacking the rear FRP sand-filled pipe 9 to fill the gap occupied by the original relay. After repeating this process, all the relay rooms are finally removed and filled with glass fiber reinforced plastic sand pipes, so that there is no need to use other methods to treat the relay rooms.

Claims (6)

1. A construction process of relay indirect force jacking of FRP pipe jacking with sand, including the following steps: 1) Set the O-shaped rubber sealing ring in the sealing ring groove on the outer wall of the tail of the front FRP sand-filled jacking pipe, fix the steel backing plate vertically on the inner wall of the front section of the steel sleeve in the relay room, and then place the relay room The front section of the steel sleeve is tightly inserted into the tail of the front FRP sand-filled pipe, and the front of the steel backing plate is in close contact with the tail end of the front FRP sand-filled pipe; 2) Place the widened pressure equalizing steel ring close to the back of the steel backing plate in the steel sleeve of the relay room, and fix the stiffening rib on the inner edge of the widened pressure equalizing steel ring to the front glass fiber reinforced plastic On the inner wall of the tail of the sand-filled pipe jacking, and then hoist the front glass fiber reinforced plastic sand-filled pipe into the working pit for jacking; 3) After the front glass fiber reinforced plastic sand-filled pipe is jacked, several inter-intermediate jack cylinders are evenly distributed on the circumference of the widened pressure equalizing steel ring connected to it, and each inter-intermediate jack cylinder is installed on the inter-intermediate jack cylinder with a fixing device. on the inner wall of the inter-steel sleeve; 4) Set the O-shaped rubber sealing ring in the sealing ring groove on the outer wall of the head of the glass fiber reinforced plastic sand-filled jacking pipe at the rear root, and place the widened pressure equalizing steel ring closely on the head end of the glass fiber reinforced plastic sand-filled sand jacking pipe at the back root, and place the The stiffening ribs on the extended edge of the widened pressure equalizing steel ring are tightly fixed on the inner wall of the head of the rear FRP sand-filled pipe, and then the rear FRP sand-filled pipe is hoisted into the working pit and inserted into the relay The rear section of the inter-steel sleeve, so that the widened pressure equalizing steel ring at the first end is in close contact with the jack between the relays, and relay jacking is carried out, and so on; 5) After the front fiberglass-reinforced sand-filled pipe is jacked in place, the jack in the relay room behind it starts to jack in. After the jacking is completed, loosen the throttle valve of the cylinder of the jack in the relay room so that the relay room further behind The jack continues to push in, and so on in a cycle until the front glass fiber reinforced plastic sand-filled pipe is completely pushed into place; 6) After the front glass fiber reinforced plastic sand-filled jacking pipe is fully jacked into place, remove the jack cylinder in the relay room, the front and rear widened pressure equalizing steel rings in sequence, and replace the jack cylinder on the steel sleeve in the relay room. Install nut holes for sealing; 7) Use the main jack or the relay jack at the back to continue jacking the rear FRP pipe with sand to fill the gap occupied by the original relay. 2. A relay room device specially designed by adopting the construction process described in claim 1, comprising a relay room steel sleeve (1), characterized in that: the front and rear of the relay room steel sleeve (1) The sections are respectively socketed at the tail of the front glass fiber reinforced plastic sand-filled pipe (10) and the head of the rear glass fiber reinforced plastic sand-filled pipe jacking (9), and O-shaped rubber sealing rings (8) are respectively provided at the front and rear sockets. ; There is a steel backing plate (2) close to the tail end of the front glass fiber reinforced plastic sand-filled pipe (10), and the steel backing plate (2) is vertically fixed on the inner wall of the steel sleeve (1) in the relay room; The back side of the backing plate (2) and the head end of the rear glass fiber reinforced plastic sand-filled pipe (9) are respectively provided with a widened pressure equalizing steel ring (3), and the inner extension edge of the widened pressure equalizing steel ring (3) is provided with The stiffening ribs (5), the stiffening ribs (5) on the front and rear widening and equalizing steel rings (3) are respectively closely attached to and fixed on the inner walls of the front and rear FRP sand-filled pipe jackings (10, 9); Between the front and rear widened pressure equalizing steel rings (3) there are several telescopic jack cylinders (7) that drive the jacks (11) between the relays, and the jack cylinders (7) pass through the fixing device (6) It is installed on the inner wall of the middle section of the steel sleeve (1) between the relays. 3. The relay room device according to claim 2, characterized in that: said widened pressure equalizing steel ring (3) adopts a piecewise assembly structure that is easy to disassemble. 4. The relay room device according to claim 2 or 3, characterized in that: the insertable length of the rear glass fiber reinforced plastic sand-filled jacking pipe (9) is the same as the length between the steel backing plate (2) and the steel sleeve in the relay room The lengths between the rear ends of the tubes (1) are equal, and the double O-shaped rubber sealing ring (8) at the front end of the glass fiber reinforced plastic sand-filled jacking pipe (9) is always located in the middle of the relay during the expansion and contraction of the jack (11) between the relays. Inside the steel sleeve (1). 5. The relay room device according to claim 2 or 3, characterized in that: the tail of the front root FRP sand-filled pipe (10) and the head of the rear FRP sand-filled pipe (9) are respectively set There are two O-type rubber sealing rings (8). 6. The relay room device according to claim 4, characterized in that: the tail of the front glass fiber reinforced plastic sand-filled pipe (10) and the head of the rear glass fiber reinforced plastic sand-filled pipe (9) are respectively provided with two Road O-shaped rubber sealing ring (8).

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