Steel caisson micro-jacking pipe and construction method

Abstract

This invention provides a steel caisson micro-jacking method and construction method, including the following steps: S1, surveying and setting out, and bringing in prefabricated steel casings; S2, preliminary excavation of the foundation pit and installation of the pipe-rolling machine; S3, hoisting the first section of the steel casing into the pit, and welding the second section of the steel casing to increase its height; S4, mechanically sinking the steel casing, and repeatedly raising the steel casing to the design elevation; S5, reinforcing the bottom of the pit with high-pressure jet grouting, and lowering the steel-concrete composite bottom seal; S6, installing the annular water collection tank, hoisting the guide frame and the pipe-jacking machine; S7, installing temporary steel internal supports, and opening and closing the openings; S8, micro-jacking construction; S9, dismantling the construction equipment, and pouring the double-casing formwork inspection well. The steel caisson micro-jacking construction method of this invention features fast construction speed, reliable construction safety, and achieves rapid bottom sealing of the steel casing caisson in confined spaces and stable construction of the steel casing caisson during the jacking process. It offers numerous construction advantages such as high stability, high efficiency, and high economic benefits, resulting in significant technical benefits.

Description

Technical Field

[0001] This invention relates to the field of municipal engineering, and in particular to steel caisson micro-jacking pipes and construction methods. Background Technology

[0002] With the continuous development of urban infrastructure construction, the demand for upgrading and improving underground pipe networks is increasing. Traditional methods of trenching and laying pipes, along with the construction of retaining foundation pits, have a significant impact on the surrounding environment, easily leading to road occupation and pipeline relocation, and can no longer meet the needs of urban production and life. Micro-pipe jacking (small-diameter pipe jacking) technology, due to its small footprint, minimal environmental impact, less restriction by ground traffic and adjacent structures, and advanced construction technology, has been increasingly widely promoted and applied in urban infrastructure renovation and upgrading projects.

[0003] Microjacking construction technology presents several challenges: 1) Complex geological conditions: Pipe jacking construction needs to be carried out underground, and the uncertainty of geological conditions poses a significant challenge. If there are large rock masses, water flows, soft soil, etc. underground, appropriate foundation treatment is required; otherwise, it will cause great difficulties in construction. 2) Space constraints: Pipe jacking construction needs to be carried out in a limited space. If the space is too small, the difficulty of construction will increase accordingly, especially the drilling operations in the pipe wall. 3) Construction safety: Pipe jacking construction needs to be carried out underground, and construction safety is the most important point. The stability of the caisson wall and the reliability of the jacking guide frame are particularly important.

[0004] In view of this, there is an urgent need to invent a construction method for a large-diameter shield tunnel ventilation shaft system that is fast, safe, and economically and technically efficient. This invention, through experimental research and comparison of construction materials and methods, proposes a construction method for a large-diameter shield tunnel ventilation shaft system. It combines novel components such as precast reinforced concrete platforms, reaction support steel frames, roller hydraulic jacks, arc-shaped support plates, and arc-shaped water-stop steel plates. Verified through multiple projects, it can provide certain technical references for tunnel engineering and has good economic and technical benefits. Summary of the Invention

[0005] The purpose of this invention is to provide a steel caisson micro jacking pipe and construction method that solve the above-mentioned technical problems.

[0006] To solve the above-mentioned technical problems, the present invention provides a construction method for a steel caisson micro-jacking pipe, comprising the following steps:

[0007] S1. Surveying and setting out, and the arrival of precast steel casing: Surveying and setting out to determine the construction position of the caisson, and closing the easy-opening and closing device inside the first section of the steel casing, while fixing the steel-concrete composite bottom plate to the casing wall with steel wire ropes and hooks;

[0008] S2. Preliminary excavation of the foundation pit and arrival of the pipe rolling machine: excavate the foundation pit to the depth of the first steel casing section;

[0009] S3. The first section of steel casing is hoisted into the pit, and the second section of steel casing is raised: The first section of steel casing is hoisted into the pit, the pipe rolling machine is installed on the first section of steel casing and fixed to the ground, and the second section of steel casing is spliced ​​with the first section of steel casing to raise it.

[0010] S4. Mechanical sinking of the steel cylinder and repeated connection of the steel casing to the design elevation: Start the pipe shaking machine to sink the steel casing and repeatedly connect the steel casing to the design elevation;

[0011] S5. High-pressure jet grouting for pit bottom reinforcement and lowering of steel-concrete composite bottom sealing: After the steel casing is lowered to the design elevation, the pit bottom is reinforced with full-span high-pressure jet grouting piles. Then, water-swellable rubber sleeves are fitted on the edge of the steel-concrete composite bottom sealing plate. Finally, the steel wire rope is released to lower the steel-concrete composite bottom sealing plate to complete the steel-concrete composite bottom sealing of the caisson.

[0012] S6. Install the annular water collection tank, hoist the guide frame and pipe jacking machine: Use the hooks on the first section of the steel casing wall to install the annular bracket, and install the annular water collection tank inside the annular bracket. Then hoist the ribbed and reinforced guide frame and pipe jacking machine in sequence.

[0013] S7. Install temporary steel internal supports and open the opening and closing ports: Install temporary steel internal supports on the wall of the steel casing, open the easy-opening and closing devices on both sides of the first section of the steel casing, adjust the position of the guide frame and the pipe jacking machine, and connect the arc-shaped backrest of the guide frame to the connecting ring of the easy-opening and closing device on one side.

[0014] S8. Micro-jacking construction: After starting the jacking machine to push the pilot pipe into the receiving well, connect it to the black pipe. Install the extrusion expander head at the tail end of the black pipe. Hoist the resin concrete pipe behind the black pipe and jack it in section by section to form a concrete pipe.

[0015] S9. Construction equipment dismantling and double-casing formwork manhole pouring construction: After the concrete pipe installation is completed, the temporary steel internal support is removed, and the construction equipment in the caisson is lifted out in sequence. The ring hanger and ring water collection tank are retrieved, and the steel ring template is installed on the easy-opening and closing device connecting ring. Then, the inner steel casing is hoisted, the manhole concrete is poured, and the inner steel casing is pulled out after the concrete has initially set to complete the construction.

[0016] The beneficial effects of this invention are as follows:

[0017] 1. This invention improves the stability of the caisson wall by setting one or more temporary steel internal supports in the upper space of the steel casing caisson. The temporary steel internal supports are mainly supported by electric jacks, which is convenient and quick. At the same time, the setting of the main support ring also facilitates the temporary hoisting of equipment inside the caisson.

[0018] 2. This invention connects multiple fan-shaped steel-concrete composite plates by setting hinge balls on the inner wall of the steel casing, thereby achieving rapid bottom sealing of the well. At the same time, the use of a blade edge design reduces the resistance of the steel casing's rotation and sinking. Compared with traditional cast-in-place concrete bottom sealing, this invention significantly improves on-site construction efficiency and ensures the quality of bottom sealing construction in confined spaces.

[0019] 3. In this invention, the caisson steel casing and the inner steel casing are directly used as the construction template for the inspection well on site, which is efficient and quick. At the same time, the inner steel casing can be recycled after the concrete of the inspection well has initially set, which can be reused to reduce construction costs. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the construction of the steel caisson micro-jacking pipe of the present invention;

[0021] Figure 2 In this invention Figure 1 AA cross-section view;

[0022] Figure 3 In this invention Figure 1 BB cross-section;

[0023] Figure 4 This is a schematic diagram of the installation of the ring-shaped bracket of the present invention;

[0024] Figure 5 This is a schematic diagram of the installation of the annular water collection tank of the present invention;

[0025] Figure 6 This is a top view of the installation of the ribbed and reinforced guide frame of the present invention;

[0026] Figure 7 This is a schematic diagram of the easy-opening and closing device of the present invention;

[0027] Figure 8 This is a schematic diagram of the double-casing support formwork manhole casting structure of the present invention.

[0028] In the diagram: 1-Original foundation soil; 2-Steel casing; 3-Main support ring; 4-Electric jacking device; 5-Vertical arc-shaped support plate; 6-Compacting grouting zone; 7-Reinforcing rib plate; 8-Guide frame; 9-Annular water collection tank; 10-Base; 11-Full-span high-pressure jet grouting pile; 12-Steel-concrete composite plate; 13-Sealed cover plate; 14-Annular hanging frame; 15-Rubber sealing ring; 16-Connecting ring; 17-Bolt hole; 18-Hinge shaft; 19-Anchor bolt; 20-Wire rope; 21-Hinge ball; 22-Steel ring template; 23-Water-swellable rubber sleeve; 24-Lifting ring; 25-Arched backrest; 26-Inspection well; 27-Interior steel casing; 28-Sensor line; 29-Pipe jacking machine; 30-Concrete pipe; 31-Hook. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0030] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention.

[0031] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0032] like Figures 1-8 The present invention provides a construction method for a steel caisson micro-jacking pipe, comprising the following steps:

[0033] S1. Measurement and layout, prefabricated steel casing 2 arrives on site: Measurement and layout determine the construction position of the caisson, check the appearance quality of the steel casing 2, and close the easy-opening and closing device inside the first section of the steel casing 2. At the same time, the steel-concrete composite sealing bottom plate is fixed to the casing wall by hooking it with steel wire rope 20.

[0034] In this step, such as Figure 7 As shown, the easy-opening and closing device includes a connecting ring 16, a closing cover plate 13, and anchor bolts 19. The connecting ring 16 is welded to the inner wall of the first section of the steel casing 2. The side of the closing cover plate 13 is rotatably connected to the inner wall of the first section of the steel casing 2 through a hinge shaft 18. The closing cover plate 13 and the connecting ring 16 are connected by anchor bolts 19. The edges of both the connecting ring 16 and the closing cover plate 13 are arc-shaped, and the arc is coupled to the inner wall of the steel casing 2. The connecting ring 16 is provided with several bolt holes 17 corresponding to the anchor bolts 19 along the circumference, so that after the closing cover plate 13 rotates to cover the connecting ring 16, the anchor bolts 19 are connected to the bolt holes 17 to fasten the connecting ring 16 and the closing cover plate 13.

[0035] like Figure 3As shown, the steel-concrete composite bottom plate is composed of multiple fan-shaped steel-concrete composite plates 12 spliced ​​together. The edges of the fan-shaped steel-concrete composite plates 12 are all set with blade edges, and the edges of the fan-shaped steel-concrete composite plates 12 are connected to the inner wall of the first section of steel casing 2 through a single hinge ball 21. A lifting ring 24 is set at the center of the steel-concrete composite bottom plate and at the end of the fan-shaped steel-concrete composite plate 12. The wire rope 20 is connected to the lifting ring 24 and passes through the hinge ball 21 so that the wire rope 20 can be rotated and engaged through the hinge ball 21 when it is hoisted.

[0036] S2. Preliminary excavation of the foundation pit and arrival of the pipe rolling machine: The foundation pit is manually excavated to a depth of 2 meters for the first steel casing, and the pipe rolling machine is simultaneously brought to the site for commissioning.

[0037] S3. The first section of steel casing 2 is hoisted into the pit, and the second section of steel casing 2 is welded to increase its height: The first section of steel casing 2 is hoisted into the pit, and the sealing performance of the easy-opening and closing device and the tightness of the wire rope 20 are checked. After the inspection is qualified, the pipe shaking machine is installed on the first section of steel casing 2 and fixed to the ground. At the same time, the second section of steel casing 2 is welded and spliced ​​to the first section of steel casing 2 to increase its height.

[0038] S4. Mechanical sinking of the steel cylinder, repeated welding of the remaining steel casing 2 to the design elevation: Start the pipe shaking machine to sink the steel casing 2 at a uniform speed, and repeatedly weld the remaining steel casing 2 to the design elevation.

[0039] S5. High-pressure jet grouting pit bottom reinforcement and lowering of steel-concrete composite bottom sealing: After the steel casing 2 is lowered to the design elevation, the pit bottom is reinforced by driving full-span high-pressure jet grouting piles 11. Then, water-swellable rubber sleeves 23 are fitted on the edge of the steel-concrete composite bottom sealing plate. Finally, the steel wire rope 20 is released to lower the steel-concrete composite bottom sealing plate, completing the steel-concrete composite bottom sealing of the caisson.

[0040] S6. Install the annular water collection tank 9, hoist the guide frame 8 and the pipe jacking machine 29: Use the hook 31 on the wall of the first section of the steel casing 2 to install the annular bracket 14, and install the annular water collection tank 9 inside the annular bracket 14. Then hoist the ribbed and reinforced guide frame 8 and the pipe jacking machine 29 in sequence.

[0041] In this step, such as Figure 4 , Figure 5 As shown, a rubber sealing ring 15 is provided between the annular water collection tank 9 and the inner wall of the first section of steel casing 2, and the two sides of the annular water collection tank 9 are placed in two adjacent annular brackets 14. The annular brackets 14 are U-shaped in general so that the two adjacent annular brackets 14 can be spliced ​​together to form an annular structure.

[0042] like Figure 6 As shown, the ribbed and reinforced guide frame 8 is provided with an arc-shaped backrest 25. Several reinforcing ribs 7 are vertically and evenly spaced on the top of the arc-shaped backrest 25. The ribbed and reinforced guide frame 8 is reserved with a jacking hole. Connecting holes are evenly arranged around the jacking hole so that the pipe jacking machine 29 can be connected to the connecting hole.

[0043] Among them, the bottom of the ribbed and reinforced guide frame 8 is placed on the steel-concrete composite bottom plate through several bases 10.

[0044] S7. Install temporary steel internal supports and open the opening and closing ports: Install temporary steel internal supports on the upper steel casing 2 cylinder wall, open the easy-opening and closing devices on both sides of the first section of steel casing 2, adjust the position of the guide frame 8 and the pipe jacking machine 29, and anchor the arc-shaped backrest 25 of the guide frame 8 to the connecting ring 16 of the easy-opening and closing device on one side.

[0045] In this step, such as Figure 2 As shown, the temporary steel inner support includes a main support ring 3, an electric jack 4, and a vertical arc-shaped support plate 5. Several electric jacks 4 are evenly arranged circumferentially on the main support ring 3. The ends of the electric jacks 4 are provided with vertical arc-shaped support plates 5, and the vertical arc-shaped support plates 5 support the inner wall of the steel casing 2.

[0046] Among them, several electric jacks 4 are connected by sensor lines 28 to enable several electric jacks 4 to push the vertical arc-shaped support plate 5 simultaneously to ensure the stability of the main support ring 3.

[0047] S8. Micro-jacking construction: Start the jacking machine 29 to jack the pilot pipe into the receiving well according to the design trajectory, then connect it to the black pipe. Install a simple extrusion head at the end of the black pipe, then hoist the resin concrete pipe and jack it in sections to form a concrete pipe 30.

[0048] S9. Construction equipment dismantling and double-casing support formwork construction of inspection well 26: After the concrete pipe 30 is installed, the temporary steel internal support is removed, and the construction equipment in the caisson is lifted out in sequence. The ring hanger 14 and the ring water collection tank 9 are recovered, and the steel ring template 22 is installed on the easy-opening and closing device connecting ring 16. Then, the inner steel casing 27 is hoisted, and the concrete of inspection well 26 is poured. After the concrete has initially set, the inner steel casing 27 is pulled out to complete the construction.

[0049] In this step, such as Figure 8 As shown, the inner diameter of the steel ring template 22 is the same as the inner diameter of the resin concrete pipe, and the length of the steel ring template 22 is the same as the thickness of the cast-in-place concrete inspection well 26.

[0050] The original foundation soil 1 is filled with a compaction grouting zone 6 on the outer periphery of the steel casing 2, so that the compaction grouting zone 6 wraps around the outside of the steel casing 2 and the concrete pipe 30.

[0051] This invention is not limited to the preferred embodiments described above. Anyone can derive other products in various forms under the guidance of this invention. However, regardless of any changes in shape or structure, any technical solution that is the same as or similar to this application falls within the protection scope of this invention.

Claims

1. A construction method for a steel caisson micro-jacking pipe, characterized in that, Includes the following steps: S1. Measurement and layout, prefabricated steel casing (2) arrives on site: Measurement and layout determine the construction position of the caisson, and close the easy-opening and closing device inside the first section of steel casing (2). At the same time, the steel-concrete composite sealing plate is fixed to the casing wall by steel wire rope (20) hook. S2, Preliminary excavation of the foundation pit and arrival of the pipe rolling machine: Excavate the foundation pit to the depth of the first section of steel casing (2); S3. The first section of steel casing (2) is hoisted into the pit, and the second section of steel casing (2) is raised: The first section of steel casing (2) is hoisted into the pit, the pipe shaking machine is installed on the first section of steel casing (2) and fixed to the ground, and the second section of steel casing (2) is spliced ​​with the first section of steel casing (2) to raise it. S4. Mechanically sink the steel cylinder and repeatedly connect the steel casing (2) to the design elevation: Start the pipe shaking machine to sink the steel casing (2) and repeatedly connect the steel casing (2) to the design elevation; S5. High-pressure jet grouting pit bottom reinforcement and lowering of steel-concrete composite bottom sealing: After the steel casing (2) is lowered to the design elevation, the pit bottom is reinforced by driving full-span high-pressure jet grouting piles (11). Then, water-swellable rubber sleeves (23) are fitted on the edge of the steel-concrete composite bottom sealing plate. Finally, the steel wire rope (20) is untied and the steel-concrete composite bottom sealing plate is lowered to complete the steel-concrete composite bottom sealing of the caisson. The steel-concrete composite bottom plate is composed of multiple fan-shaped steel-concrete composite plates (12) spliced ​​together. The edges of the fan-shaped steel-concrete composite plates (12) are all set with blade edges, and the edges of the fan-shaped steel-concrete composite plates (12) are connected to the inner wall of the first section of steel casing (2) through hinge balls (21). A lifting ring (24) is set at the center of the steel-concrete composite bottom plate and at the end of the fan-shaped steel-concrete composite plate (12). The steel wire rope (20) is connected to the lifting ring (24) and passes through the hinge balls (21). S6. Install the annular water collection tank (9), hoist the guide frame (8) and the pipe jacking machine (29): Use the hook (31) on the wall of the first section of steel casing (2) to install the annular bracket (14), and install the annular water collection tank (9) inside the annular bracket (14), and then hoist the ribbed and reinforced guide frame (8) and the pipe jacking machine (29) in sequence. S7. Install temporary steel internal support and open the opening and closing port: Install temporary steel internal support on the wall of the steel casing (2), open the easy opening and closing device on both sides of the first section of the steel casing (2), adjust the position of the guide frame (8) and the pipe jacking machine (29), and connect the arc-shaped backrest (25) of the guide frame (8) to the connecting ring (16) of the easy opening and closing device on one side. S8. Micro jacking construction: Start the jacking machine (29) to jack the pilot pipe into the receiving well, then connect the black pipe, install the extrusion expansion head at the end of the black pipe, and hoist the resin concrete pipe behind the black pipe and jack it in section by section to form a concrete pipe (30). S9. Construction equipment dismantling and double-casing support formwork construction of inspection well (26): After the concrete pipe (30) is installed, the temporary steel inner support is removed, and the construction equipment in the caisson is lifted out in sequence. The ring hanger (14) and the ring water collection tank (9) are recovered, and the steel ring template (22) is installed on the easy-opening and closing device connecting ring (16). Then the inner steel casing (27) is hoisted and the concrete of the inspection well (26) is poured. After the concrete has initially set, the inner steel casing (27) is pulled out to complete the construction.

2. The construction method of the steel caisson micro-jacking pipe according to claim 1, characterized in that: The easy-opening and closing device includes a connecting ring (16) and a closing cover plate (13). The connecting ring (16) is connected to the inner wall of the first section of the steel casing (2). The side of the closing cover plate (13) is rotatably connected to the inner wall of the first section of the steel casing (2) through a hinge shaft (18). The edges of the connecting ring (16) and the closing cover plate (13) are both arc-shaped structures, and the arc is coupled to the inner wall of the steel casing (2).

3. The construction method of the steel caisson micro-jacking pipe according to claim 2, characterized in that: The closed cover plate (13) and the connecting ring (16) are connected by anchor bolts (19), and the connecting ring (16) is provided with several bolt holes (17) corresponding to the anchor bolts (19) along the circumferential direction, so that after the closed cover plate (13) rotates to cover the connecting ring (16), the anchor bolts (19) are connected to the bolt holes (17).

4. The construction method of the steel caisson micro-jacking pipe according to claim 1, characterized in that: A rubber sealing ring (15) is provided between the annular water collection tank (9) and the inner wall of the first steel casing (2), and the two sides of the annular water collection tank (9) are placed in two adjacent annular brackets (14), and the annular brackets (14) are U-shaped in whole.

5. The construction method of the steel caisson micro-jacking pipe according to claim 1, characterized in that: The ribbed and reinforced guide frame (8) is provided with an arc-shaped backrest (25), and the top of the arc-shaped backrest (25) is provided with several reinforcing ribs (7) at equal intervals.

6. The construction method of the steel caisson micro-jacking pipe according to claim 5, characterized in that: The bottom of the ribbed and reinforced guide frame (8) is placed on the steel-concrete composite bottom plate via several bases (10).

7. The construction method of the steel caisson micro-jacking pipe according to claim 1, characterized in that: The temporary steel internal support includes a main support ring (3), an electric jack (4) and a vertical arc support plate (5). Several electric jacks (4) are evenly arranged on the main support ring (3) in a circumferential direction. The end of the electric jack (4) is provided with a vertical arc support plate (5), and the vertical arc support plate (5) supports the inner wall of the steel casing (2).

8. A steel caisson micro-jacking pipe, characterized in that: The steel caisson micro-jacking pipe is obtained by the construction method according to any one of claims 1-7.

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