Mud blocking and water stopping structure for rectangular pipe jacking receiving tunnel portal
By setting a combination structure of fender steel plate and high-density sponge strips in the rectangular top tube reception hole door, the problem of water and sand gushing in the rectangular top tube construction is solved, and the hole-out ring joint is quickly closed to ensure construction safety and water-free hole-out.
Patent Information
- Application Number
- CN202422646798.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-30
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2034-10-30
AI Technical Summary
In the prior art, when the rectangular top pipe is constructed, the receiving hole door lacks an effective sludge and water stop structure, resulting in a high risk of water and sand gushing, especially in water-rich soft soil strata.
Two mud-steel plates are set up on the inner side of the steel ring of the rectangular top tube receiving hole door, and high-density sponge strips are plugged in between. There are gaps at the bottom of the fender steel plate. When the pipe header comes out of the hole, it leans forward to envelop and blocks the hole ring gap, and combines the high-density sponge strip to absorb water and form a rapid closure.
It has achieved rapid closing of the hole-out ring joints, preventing soil erosion, ensuring "waterless" hole-out, improving construction safety, and creating conditions for subsequent welding and other work.
Smart Images
Figure CN223215265U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of pipe jacking construction, in particular to a mud retaining and water stopping structure for a rectangular pipe jacking receiving hole. Background Art
[0002] Most subway entrances and exits are planned on both sides of urban roads. The crossing sections are often connected to the stations through pedestrian overpasses. There are many pipelines under the main roads, the surrounding environment is complex, and the traffic volume is large. The open-cut construction method cannot meet their normal requirements. The pipe jacking method for constructing pedestrian crossings has great advantages. It has the characteristics of small ground disturbance, avoidance of pipeline cutting and modification, and uninterrupted traffic, and is therefore widely used.
[0003] Waterproofing measures at the starting point of pipe jacking typically involve a small double-layer steel box with a curtain fabric. This involves pre-embedding a portal steel ring during structural construction and attaching a curtain fabric water-stop device to the portal steel ring before the start of the operation. The moment the pipe jacking machine enters the tunnel, the small steel box seals the gap between the portal, the machine, and the subsequent pipe sections, effectively sealing the water. However, when the machine exits the tunnel, there are often no water-stopping or mud-blocking measures. Furthermore, in water-rich soft soil formations, the risk of water and sand gushing during the operation is extremely high. Therefore, mud-blocking and water-stopping structures are required at the receiving portal of rectangular pipe jacking. Utility Model Content
[0004] The utility model provides a mud-blocking and water-stopping structure for a rectangular jacking pipe receiving hole in order to solve the technical problems existing in the known technology.
[0005] The utility model adopts the following technical solutions to solve the technical problems existing in the known technology: a mud-blocking and water-stopping structure for a rectangular jacking pipe receiving tunnel, which is arranged on the annular seam of the jacking pipe exit tunnel and includes two mud-blocking steel plates fixed on the inner side of the tunnel gate steel ring, a groove is formed between the two mud-blocking steel plates, a high-density sponge strip is plugged in the groove, and a plurality of evenly distributed notches are provided on the lower part of the mud-blocking steel plates. When a jacking machine or a pipe section passes through, the mud-blocking steel plates tilt forward and embrace the outer side of the jacking machine or the pipe section to seal the annular seam of the jacking pipe exit tunnel.
[0006] The length of the mudguard steel plate is 5-8 cm longer than the maximum width of the annular seam of the top pipe exit hole.
[0007] The thickness of the mudguard steel plate is 3-5 mm.
[0008] The length of the high-density sponge strip is less than or equal to the maximum width of the annular seam of the top pipe hole.
[0009] The width of the groove is 20-30 cm.
[0010] The advantages and positive effects of the utility model are as follows: a structure in which two mud-blocking steel plates are arranged on the steel ring of the tunnel portal, high-density sponge strips are stuffed between the two steel plates, and multiple notches are arranged on the lower part of the steel plates; when the pipe jacking machine exits the tunnel, the mud-blocking and water-stopping structures can quickly close the annular seam of the tunnel portal, thereby preventing water and soil loss in the annular seam; the high-density sponge strips can quickly absorb water seepage around the tunnel portal, thereby creating favorable conditions for subsequent work such as welding of the sealing steel plates and installation of the tunnel portal water-stopping ring hoop; the effect of "waterless" exiting the tunnel can be achieved, thereby greatly improving the safety of the pipe jacking construction. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a structural diagram of the utility model;
[0012] Figure 2 for Figure 1 A magnified view of part A;
[0013] Figure 3 This is a schematic diagram of the structure of the high-density sponge strips of the utility model filled in two mudguard steel plates;
[0014] Figure 4 This is a structural diagram of the mudguard steel plate of the present invention.
[0015] In the figure: 1. Pipe joint; 2. Reinforced soil; 3. Pipe jacking machine; 4. Portal steel ring; 5. Receiving shaft track beam; 6. Mudguard steel plate; 7. High-density sponge strip; 8. Notch; 9. Sealing steel plate; 10. Underground continuous wall. DETAILED DESCRIPTION
[0016] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:
[0017] See also Figures 1-4 A mud-blocking and water-stopping structure for a rectangular jacking tunnel receiving portal, which is arranged on the annular seam of the jacking tunnel, comprises two mud-blocking steel plates 6 fixed on the inner side of the tunnel portal steel ring 4, a groove being formed between the two mud-blocking steel plates 6, a high-density sponge strip 7 being plugged in the groove, a plurality of evenly distributed notches 8 being provided on the lower part of the mud-blocking steel plates 6, when the jacking machine 3 or the pipe section 1 passes through, the mud-blocking steel plates 6 tilt forward and embrace the outer side of the jacking machine 3 or the pipe section 1, thereby sealing the annular seam of the jacking tunnel.
[0018] The more preferred solution of this embodiment is as follows:
[0019] The length of the mudguard steel plate 6 is 5-8 cm longer than the maximum width of the annular seam of the top pipe hole, which can take into account both the sealing effect and the running resistance. Similarly, the thickness of the mudguard steel plate 6 is 3-5 mm.
[0020] The length of the high-density sponge strip 7 is less than or equal to the maximum width of the annular seam of the top pipe hole, which facilitates the forward tilting of the mudguard steel plate during sealing.
[0021] The width of the groove is 20-30 cm, which can take into account the sealing effect, deformation difficulty and running resistance.
[0022] The construction and working principle of this utility model:
[0023] When the pipe jacking machine 3 reaches the underground diaphragm 10 through the reinforced soil 2, it stops to maintain pressure while the diaphragm 10 is broken down and the mudguard steel plates 6 are prefabricated. When the diaphragm 10 is broken down to the rebar on the soil-facing side, welders weld the mudguard steel plates 6 around the portal steel ring 4 and secure them. After the rebar on the soil-facing side of the diaphragm 10 is cut, high-density sponge strips 7 are inserted between the two mudguard steel plates 6, forming a mud and water-stopping structure.
[0024] When the pipe jacking machine 3 continues to advance to the receiving track beam 5, the pipe jacking machine 3 drives the mud guard steel plate 6 to tilt forward rapidly. The mud guard and water stop structure surrounds the outer side of the pipe jacking machine shell, forming a seal on the annular seam of the jacking pipe hole, playing a role in mud and water stopping. When the outer shell of the pipe jacking machine 3 is detached, the mud guard steel plate 6 contacts the rear pipe segment. Due to the flexibility of the steel plate, it will be quickly rebounded on the rear pipe segment and surround the rear pipe segment 1. When all the pipe segments are in place, the shield tail of the pipe jacking machine is separated from the pipe segment and begins to weld the sealing steel plate 9 along the circumference of the tunnel steel ring 4, finally completing the entire receiving process.
[0025] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which all fall within the scope of protection of the present invention.
Claims
1. A mud-blocking and water-stopping structure for a rectangular jacking receiving tunnel, characterized in that: The structure is arranged on the annular seam of the jacking pipe exit hole, and includes two mudguard steel plates fixed on the inner side of the tunnel gate steel ring. A groove is formed between the two mudguard steel plates, and a high-density sponge strip is plugged in the groove. The lower part of the mudguard steel plate is provided with multiple evenly distributed notches. When the jacking machine or pipe section passes through, the mudguard steel plate tilts forward and embraces the outside of the jacking machine or pipe section to seal the annular seam of the jacking pipe exit hole.
2. The mud-blocking and water-stopping structure for a rectangular jacking pipe receiving tunnel according to claim 1, characterized in that: The length of the mudguard steel plate is 5-8 cm longer than the maximum width of the annular seam of the top pipe exit hole.
3. The mud-blocking and water-stopping structure for a rectangular jacking pipe receiving tunnel according to claim 1, characterized in that: The thickness of the mudguard steel plate is 3-5 mm.
4. The mud-blocking and water-stopping structure for a rectangular jacking pipe receiving tunnel according to claim 1, characterized in that: The length of the high-density sponge strip is less than or equal to the maximum width of the annular seam of the top pipe hole.
5. The mud-blocking and water-stopping structure for a rectangular jacking pipe receiving tunnel according to claim 1, characterized in that: The width of the groove is 20-30 cm.