Construction method of large-diameter reinforced concrete pipe jacking type steel brick wall sealing door into hole

Abstract

The application relates to a large-diameter reinforced concrete jacking pipe type steel brick wall sealing door hole construction method, which comprises a steel, a positioning casing, a caisson, a flexible end, an exposed pipe joint, an operation platform, a pipe joint, a jacking machine and an arc-shaped formwork; the method comprises the following steps: caisson pouring, caisson sinking, concrete bottom sealing, hole opening water stop construction, jacking construction and receiving well hole opening sealing construction. The application has the beneficial effects that: a reinforcing steel is arranged on the temporary steel sealing door, the sealing door structure stability is improved, and the caisson sinking safety is ensured; the arc-shaped channel steel frame is placed on the exposed pipe joint, a standardized operation platform is formed, the construction platform erection workload is reduced, and the construction efficiency is improved; the counterforce frame is arranged behind the jacking machine, the base is arranged at the lower part of the jacking machine, the jacking pipe construction precision is improved, and the construction quality is ensured; the arc-shaped formwork system is installed on the jacking pipe hole, and the hole construction efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of caisson jacking pipe sealing construction, and particularly relates to a construction method for sealing the entrance of an ultra-large diameter reinforced concrete jacking pipe with a steel brick wall. Background Technology

[0002] With the rapid development of China's economy, the development and exploration of urban underground space has become a hot topic in urban construction. The demand for underground space development is increasing, and pipe jacking has become an important part of trenchless underground construction. Pipe jacking offers certain advantages for dealing with the complex underground pipelines, traffic, environmental protection, and geological conditions in cities. Currently, domestic pipe jacking technology is maturing, and its development is moving towards higher construction challenges, gradually moving towards longer distances, larger diameters, greater burial depths, and shallower overburden, placing increasingly higher demands on pipe jacking construction techniques.

[0003] Traditional methods of sealing tunnel entrances using reinforced concrete are simple and fast, but subsequent dismantling is cumbersome. For small-diameter immersed tunnel construction, the entrance is sealed directly with brickwork. However, using this method directly in large-diameter jacking tunnels can cause the caisson to sink and become unstable, potentially leading to collapse. Furthermore, poor sealing of the jacking tunnel entrance can allow groundwater and sediment to flow into the working shaft, affecting construction and hindering the loss of thixotropic mud, thus reducing its lubrication and drag-reducing effects.

[0004] In view of this, in response to a series of problems that arise during the construction of the tunnel opening, there is an urgent need to invent a simple and effective ultra-large diameter reinforced concrete jacking pipe sealing structure to enhance the stability of the tunnel opening, reduce the difficulty of the tunnel opening sealing construction, and thus enhance the sealing performance of the jacking pipe sealing. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a construction method for sealing the entrance to a tunnel using a steel brick wall with an ultra-large diameter reinforced concrete jacking pipe.

[0006] This ultra-large diameter reinforced concrete pipe jacking steel brick wall sealing structure includes steel profiles, positioning casing, caisson, flexible end, exposed pipe section, operating platform, pipe section, pipe jacking machine and arc-shaped formwork;

[0007] The jacking tunnel opening is equipped with a positioning casing, inside which there is a brick wall and a temporary steel sealing door. An arc-shaped channel steel frame is placed on the exposed pipe section, and an operating platform is provided on one side of the arc-shaped channel steel frame; a platform is also provided on the pipe section.

[0008] The pipe jacking machine is equipped with a reaction frame at the rear. One end of the upright is connected to the bottom of the caisson, and the other end is connected to a connecting crossbar with rolling wheels. The arc-shaped template is set at the opening of the pipe jacking hole and is supported by the upright. The arc-shaped template is equipped with grouting holes and grout leakage holes.

[0009] As a preferred embodiment: the caisson is equipped with a positioning casing when the jacking pipe opening is poured, wherein one end of the positioning casing is provided with a flexible end and the other end is provided with a weld, the positioning casing is provided with anchoring steel bars, the outside of the brick wall is provided with a plaster layer, and the inside of the brick wall is provided with a temporary steel sealing door, the temporary steel sealing door includes reinforcing steel, the reinforcing steel is pulled together by bolts, and the bolts are provided with washers.

[0010] Preferably, an arc-shaped channel steel frame is placed on the exposed pipe section, the arc-shaped channel steel frame is provided with a slot, one end of the operating platform is placed in the slot and the other end is provided with a fixed tripod, and the fixed tripod is connected to a portal scaffold.

[0011] Preferably, the pipe section is provided with a T-shaped embedded part, the T-shaped embedded part is connected to a support column by bolts, the support column is provided with a platform, and the platform is provided with a guardrail.

[0012] Preferably, the pipe jacking machine is provided with a back wall at the rear, a reaction frame is provided in front of the back wall, a base is provided at the bottom of the pipe jacking machine, angle steel is pre-embedded at the bottom of the caisson, one end of the upright is connected to the angle steel, and the other end is connected to a connecting crossbar. Rolling wheels are provided on the connecting crossbar, and the uprights are connected by connecting rods.

[0013] Preferably, the pipe section is supported by a base, and the arc-shaped template is supported by uprights.

[0014] The construction method for this type of ultra-large diameter reinforced concrete jacking pipe steel brick wall sealing structure includes the following steps:

[0015] Step 1: Caisson pouring; After the reinforcement is tied, the formwork is constructed. When the caisson is poured at the opening of the jacking pipe, a positioning casing is installed. A brick wall and a temporary steel sealing door are set inside the positioning casing.

[0016] Step 2: Lowering the caisson; pressing the caisson into the designed position;

[0017] Step 3: Concrete sealing of the bottom; clean the base and pour the bottom of the caisson;

[0018] Step 4: Water-stopping construction at the opening; install a water-stopping ring at the opening and set up an operating platform on one side of the exposed pipe section;

[0019] Step 5: Jacking construction; A reaction frame and back wall are set behind the pipe jacking machine. One end of the upright is connected to the bottom of the caisson, and the other end is connected to the connecting crossbar equipped with rolling wheels.

[0020] Step 6: Sealing the wellhead: The pipe section is supported by the base. An arc-shaped template with grouting holes and leakage holes is set at the opening of the jacking pipe. The arc-shaped template is supported by uprights. Grouting pipes are inserted into both sides of the arc-shaped template for grouting.

[0021] Preferably, in step one, a positioning casing is installed at the location of the caisson when the jacking pipe opening is poured. The positioning casing has a flexible end at one end and a weld at the other end. Anchor steel bars are installed on the positioning casing. A plaster layer is installed on the outside of the brick wall. A temporary steel sealing door is installed on the inside of the brick wall. The temporary steel sealing door is composed of reinforcing steel, etc. The reinforcing steel is tied together by bolts, and washers are installed on the bolts.

[0022] Preferably, in step four, an arc-shaped channel steel frame is placed on the exposed pipe section, and a slot is set on the arc-shaped channel steel frame. One end of the operating platform is placed in the slot and the other end is placed on a fixed tripod, which is fixed to the portal scaffold. T-shaped embedded parts are set on the pipe section, and the support uprights are connected to the T-shaped embedded parts by bolts. A platform is set on the support uprights, and a guardrail is set on the platform.

[0023] Preferably, in step three, angle steel is pre-embedded at the bottom of the caisson; in step five, a back wall is set behind the pipe jacking machine, a reaction frame is set in front of the back wall, a base is set at the bottom of the pipe jacking machine, one end of the upright is connected to the angle steel and the other end is connected to the connecting crossbar, a rolling wheel is set on the connecting crossbar, and the uprights are connected by a connecting rod.

[0024] The beneficial effects of this invention are:

[0025] 1) Adding reinforcing steel to the temporary steel sealing door can improve the stability of the sealing door structure and ensure the safety of the caisson sinking.

[0026] 2) By placing an arc-shaped steel frame on the exposed pipe section, a standardized operating platform is formed, which reduces the workload of building the construction platform and improves construction efficiency.

[0027] 3) The pipe jacking machine is equipped with a reaction frame at the rear and a base at the bottom, which improves the accuracy of pipe jacking construction and ensures the construction quality.

[0028] 4) Installing an arc-shaped template system at the pipe jacking opening improved the efficiency of the opening construction. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the caisson structure of the present invention;

[0030] Figure 2 This is a structural diagram of the positioning casing;

[0031] Figure 3 This is a cross-sectional view of the pipe jacking sealing opening;

[0032] Figure 4 This is a schematic diagram of the arc-shaped standardized operating platform structure;

[0033] Figure 5 This is a schematic diagram of a pre-embedded, standardized operating platform structure;

[0034] Figure 6This is a schematic diagram of the pipe jacking machine installation plan;

[0035] Figure 7 This is a cross-sectional view of the pipe jacking machine installation.

[0036] Figure 8 This is a schematic diagram of the pipe jacking machine's posture adjustment;

[0037] Figure 9 This is a schematic diagram of the pipe jacking and sealing construction.

[0038] Among them: 1-Steel section; 2-Positioning casing; 3-Caison; 4-Flexible fixed end; 5-Weld; 6-Anchoring steel bar; 7-Temporary steel sealing door; 8-Brick wall; 9-Reinforcing steel section; 10-Bolt; 11-Washer; 12-Nut; 13-Plaster layer; 14-Portal scaffold; 15-Fixed tripod; 16-Groove; 17-Fixing bolt; 18-Jack pipe; 19-Water-stop collar; 20-Arc-shaped channel steel frame; 21-Exposed pipe section; 2 2-Operating platform; 23-Guardrail; 24-Platform; 25-Support pole; 26-T-shaped embedded part; 27-Bolt; 28-Pipe section; 29-Jack; 30-Back wall; 31-Reaction frame; 32-Pole; 33-Connecting rod; 34-Earth pressure balance pipe jacking machine; 35-Angle steel; 36-Rolling wheel; 37-Connecting crossbar; 38-Grouting hole; 39-Grouting leakage hole; 40-Arc-shaped formwork; 41-Base; 42-Ceiling bottom. Detailed Implementation

[0039] The present invention will be further described below with reference to embodiments. The description of the embodiments below is only for the purpose of helping to understand the present invention. It should be noted that those skilled in the art can make several modifications to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0040] Example 1

[0041] As one example, such as Figures 1 to 9 As shown, the ultra-large diameter reinforced concrete pipe jacking steel brick wall sealing structure includes steel section 1, positioning casing 2, caisson 3, movable end 4, exposed pipe section 21, operating platform 22, pipe section 28, pipe jacking machine 34 and arc-shaped formwork 40;

[0042] The jacking tunnel opening is equipped with a positioning casing 2, inside which there is a brick wall 8 and a temporary steel sealing door 7. An arc-shaped channel steel frame 20 is placed on the exposed pipe section 21, and an operating platform 22 is provided on one side of the arc-shaped channel steel frame 20; a platform 24 is provided on the pipe section 28.

[0043] The pipe jacking machine 34 is equipped with a reaction frame 31. One end of the upright 32 is connected to the bottom of the caisson 42, and the other end is connected to a connecting crossbar 37 equipped with a rolling wheel 36. The arc-shaped template 40 is set at the opening of the pipe jacking hole. The arc-shaped template 40 is supported by the upright 32. The arc-shaped template 40 is equipped with a grouting hole 38 and a grout leakage hole 39.

[0044] like Figure 1 , Figure 2 , Figure 3 As shown, when the caisson 3 is poured at the opening of the jacking pipe, a positioning casing 2 is installed. One end of the positioning casing 2 is provided with a flexible end 4 and the other end is provided with a weld 5. Anchor steel bars 6 are provided in the positioning casing 2. A plaster layer 13 is provided on the outside of the brick wall 8. A temporary steel sealing door 7 is provided on the inside of the brick wall 8. The temporary steel sealing door 7 is composed of reinforcing steel 9, etc. The reinforcing steel 8 is pulled by bolts 10, and washers 11 are provided on the bolts 10.

[0045] like Figure 4 As shown, an arc-shaped channel steel frame 20 is placed on the exposed pipe section 21, and a slot 16 is provided on the arc-shaped channel steel frame 20. One end of the operating platform 22 is placed in the slot 16 and the other end is on the fixed tripod 15. The fixed tripod 15 is fixed to the portal scaffold 14.

[0046] like Figure 5 As shown, a T-shaped embedded part 26 is provided on the pipe section 28, and the support column 25 is connected to the T-shaped embedded part 26 by bolts 27. A platform 24 is provided on the support column 25, and a guardrail 23 is provided on the platform 24.

[0047] like Figure 6 , Figure 7 , Figure 8 As shown, a back wall 30 is set behind the pipe jacking machine 34, and a reaction frame 31 is set in front of the back wall 30. Angle steel 35 is pre-embedded in the bottom of the caisson 42 of the lower base 41 of the pipe jacking machine 34. One end of the upright 32 is connected to the angle steel 35 and the other end is connected to the connecting crossbar 37. Rolling wheels 36 are set on the connecting crossbar 37. The uprights 33 are connected by connecting rods 33.

[0048] Figure 9 As shown, the pipe section 28 is supported by the base 41, and the arc-shaped template 40 is provided with grouting holes 38 and grout leakage holes 39. The arc-shaped template 40 is supported by uprights 32.

[0049] Example 2

[0050] As another embodiment, the method for tunnel entry construction using the ultra-large diameter reinforced concrete jacking pipe steel brick wall sealing structure proposed in Embodiment 1 includes the following steps:

[0051] Step 1: Caisson pouring; After the reinforcement binding is completed, the formwork is constructed. When the caisson 3 is poured at the opening of the jacking pipe, the positioning casing 2 is installed. One end of the positioning casing 2 is equipped with a flexible end 4 and the other end is equipped with a weld 5. The positioning casing 2 is equipped with anchoring reinforcement 6. A plaster layer 13 is installed on the outside of the brick wall 8. A temporary steel sealing door 7 is installed on the inside of the brick wall 8. The temporary steel sealing door 7 is composed of reinforcing steel 9, etc. The reinforcing steel 8 is pulled by bolts 10, and washers 11 are installed on the bolts 10.

[0052] Step 2: Caisson sinking; After the guide beam is cured, the pressing equipment is installed. The standard section of the caisson is pressed into the soil using the pressing equipment. Then, soil is removed from the caisson, and the caisson is pressed into the design position through cyclic construction.

[0053] Step 3: Concrete sealing of the bottom; Before sealing the bottom of the caisson, divers will be arranged to clean the base underwater with the help of high-pressure pumps. Two pump trucks will be used for sealing the bottom, and the concrete will be poured symmetrically according to the grid beam segmentation blocks.

[0054] Step 4: Waterproofing construction at the opening; Waterproofing ring 19 is installed at the opening for waterproofing. The construction platform can be constructed by placing an arc-shaped channel steel frame 20 on the exposed pipe section 21, setting a slot 16 on the arc-shaped channel steel frame 20, placing one end of the operating platform 22 in the slot 16 and the other end on the fixed tripod 15, which is then fixed to the portal scaffold 14.

[0055] Step 5: Jacking construction; A back wall 30 is set behind the pipe jacking machine 34, and a reaction frame 31 is set in front of the back wall 30. Angle steel 35 is pre-embedded in the bottom of the caisson 42 of the lower base 41 of the pipe jacking machine 34. One end of the upright 32 is connected to the angle steel 35 and the other end is connected to the connecting crossbar 37. Rolling wheels 36 are set on the connecting crossbar 37. The uprights 33 are connected by connecting rods 33.

[0056] Step 6: Sealing the wellhead: Pipe section 28 is supported by base 41. Grouting holes 38 and leakage holes 39 are set on the arc-shaped template 40. The arc-shaped template 40 is supported by uprights 32. Grouting pipes are inserted into both sides of the arc-shaped template 40 for grouting.

Claims

1. A door sealing structure for an ultra-large diameter reinforced concrete jacking pipe type steel brick wall, characterized in that: Includes steel profile (1), positioning casing (2), caisson (3), movable end (4), exposed pipe section (21), operating platform (22), pipe section (28), pipe jacking machine (34) and arc template (40); The jacking tunnel opening is equipped with a positioning casing (2), and the positioning casing (2) is equipped with a brick wall (8) and a temporary steel sealing door (7). An arc-shaped channel steel frame (20) is placed on the exposed pipe section (21), and an operating platform (22) is provided on one side of the arc-shaped channel steel frame (20); a platform (24) is provided on the pipe section (28). The pipe jacking machine (34) is equipped with a reaction frame (31) at the rear. One end of the upright (32) is connected to the bottom of the caisson (42), and the other end is connected to a connecting crossbar (37) equipped with a rolling wheel (36). The arc-shaped template (40) is set at the opening of the pipe jacking hole. The arc-shaped template (40) is supported by the upright (32). The arc-shaped template (40) is equipped with a grouting hole (38) and a grout leakage hole (39). The caisson (3) is equipped with a positioning casing (2) when the jacking pipe opening is poured. The positioning casing (2) has a flexible end (4) at one end and a weld (5) at the other end. The positioning casing (2) is equipped with anchoring steel bars (6). The brick wall (8) is equipped with a plaster layer (13) on the outside and a temporary steel sealing door (7) on the inside of the brick wall (8). The temporary steel sealing door (7) includes reinforcing steel (9). The reinforcing steel (9) is pulled by bolts (10). The bolts (10) are equipped with washers (11). An arc-shaped channel steel frame (20) is placed on the exposed pipe section (21). The arc-shaped channel steel frame (20) has a slot (16). One end of the operating platform (22) is placed in the slot (16), and the other end is provided with a fixed tripod (15). The fixed tripod (15) is connected to a portal scaffold (14).

2. The ultra-large diameter reinforced concrete jacking pipe steel brick wall sealing structure according to claim 1, characterized in that: The pipe section (28) is provided with a T-shaped embedded part (26), and the T-shaped embedded part (26) is connected to a support pole (25) by bolts (27). A platform (24) is provided on the support pole (25), and a guardrail (23) is provided on the platform (24).

3. The ultra-large diameter reinforced concrete jacking pipe steel brick wall sealing structure according to claim 1, characterized in that: The pipe jacking machine (34) is provided with a back wall (30) at the rear, and a reaction frame (31) is provided in front of the back wall (30). The pipe jacking machine (34) is provided with a base (41) at the bottom. Angle steel (35) is pre-embedded in the bottom of the caisson (42). One end of the upright (32) is connected to the angle steel (35), and the other end is connected to a connecting crossbar (37). Rolling wheels (36) are provided on the connecting crossbar (37). The uprights (32) are connected by connecting rods (33).

4. The ultra-large diameter reinforced concrete jacking pipe steel brick wall sealing structure according to claim 3, characterized in that: The pipe section (28) is supported by the base (41), and the arc-shaped template (40) is supported by the uprights (32).

5. The method for constructing an entrance to a large-diameter reinforced concrete jacking pipe steel brick wall sealing structure as described in any one of claims 1 to 4, characterized in that, Includes the following steps: Step 1: Casting of caisson; After the reinforcement is tied, the formwork is constructed. When the caisson (3) is cast at the opening of the jacking pipe, a positioning casing (2) is installed. A brick wall (8) and a temporary steel sealing door (7) are set inside the positioning casing (2). Step 2: Lowering the caisson; Press the caisson (3) into the designed position; Step 3: Concrete sealing; clean the base and pour the bottom of the caisson (42). Step 4: Water-stopping construction at the opening; install a water-stopping ring (19) at the opening and set up an operating platform (22) on one side of the exposed pipe section (21); Step 5, jacking construction; a reaction frame (31) and a back wall (30) are set behind the pipe jacking machine (34). One end of the upright (32) is connected to the bottom of the caisson (42), and the other end is connected to the connecting crossbar (37) with a rolling wheel (36); Step 6: Sealing construction of the starting well opening: The pipe section (28) is supported by the base (41). An arc-shaped template (40) with grouting holes (38) and leakage holes (39) is set at the opening of the jacking pipe. The arc-shaped template (40) is supported by the uprights (32). The grouting pipe is inserted into both sides of the arc-shaped template (40) for grouting.

6. The tunnel construction method according to claim 5, characterized in that: In step one, the caisson (3) is installed with a positioning casing (2) when the jacking pipe opening is poured. The positioning casing (2) has a flexible end (4) at one end and a weld (5) at the other end. The positioning casing (2) is equipped with anchoring steel bars (6). A plaster layer (13) is set outside the brick wall (8). A temporary steel sealing door (7) is set inside the brick wall (8). The temporary steel sealing door (7) includes reinforcing steel (9). The reinforcing steel (9) is pulled by bolts (10). A washer (11) is set on the bolts (10).

7. The tunnel construction method according to claim 5, characterized in that: In step four, an arc-shaped channel steel frame (20) is placed on the exposed pipe section (21), and a slot (16) is set on the arc-shaped channel steel frame (20). One end of the operating platform (22) is placed in the slot (16) and the other end is on the fixed tripod (15). The fixed tripod (15) is fixed to the portal scaffold (14). A T-shaped embedded part (26) is set on the pipe section (28), and the support pole (25) is connected to the T-shaped embedded part (26) by bolts (27). A platform (24) is set on the support pole (25), and a guardrail (23) is set on the platform (24).

8. The tunnel construction method according to claim 5, characterized in that: In step three, an angle steel (35) is pre-embedded at the bottom of the caisson (42); in step five, a back wall (30) is set behind the pipe jacking machine (34), a reaction frame (31) is set in front of the back wall (30), a base (41) is set at the bottom of the pipe jacking machine (34), one end of the upright (32) is connected to the angle steel (35) and the other end is connected to the connecting crossbar (37), a rolling wheel (36) is set on the connecting crossbar (37), and the uprights (32) are connected by a connecting rod (33).

Images