Steel open caisson miniature jacking pipe and construction method

Abstract

The invention provides a steel open caisson miniature jacking pipe and a construction method. The construction method comprises the following steps that S1, surveying and setting out are conducted, and a prefabricated steel casing enters a site; s2, a foundation pit is preliminarily excavated, and pipe rocking machine equipment is installed; s3, the first section of steel casing is hoisted into the pit, and the second section of steel casing is welded and heightened; s4, the steel cylinder sinks mechanically, and the steel casing is repeatedly heightened to the designed elevation; s5, the high-pressure jet grouting pit bottom is reinforced, and a steel-concrete combination is put down to seal the bottom; s6, an annular water collecting tank is installed, and a guide frame and a pipe jacking machine are hoisted; s7, a temporary steel inner support is installed, and an opening closed opening is opened; s8, micro jacking pipe jacking construction is carried out; and S9, construction equipment is dismantled, and pouring construction of the double-pile-casing formwork inspection well is conducted. According to the micro pipe jacking construction method for the steel open caisson, the construction speed is high, construction is safe and reliable, meanwhile, the construction effect of fast bottom sealing of steel casing open caisson operation in a narrow space and the construction effect of steadiness of the steel casing open caisson in the pushing process are achieved, the construction advantages of high stability, high efficiency, high benefits and the like are achieved during implementation, and the technical benefits are remarkable.

Description

Technical Field

[0001] The invention relates to the field of municipal engineering, in particular to a steel caisson micro-jacking pipe and a construction method. Background Art

[0002] With the continuous development of urban infrastructure construction, the demand for the renewal and upgrading of underground pipe networks is increasing. The traditional technology of trenching and laying pipes and enclosing foundation pits has a great impact on the surrounding environment, and is prone to occupying roads and relocating pipelines, which can no longer meet the needs of urban production and life. Micro-pipe jacking (small-diameter pipe jacking) technology has been increasingly widely promoted and applied in urban infrastructure renovation and upgrading construction because of its small footprint, small environmental impact, small limitations on ground transportation and adjacent structures, and advanced construction technology.

[0003] Micro-pipe jacking construction technology has the following difficulties: 1) Complex geological conditions: Pipe jacking construction needs to be carried out underground. The uncertainty of geological conditions will bring great challenges to the construction. If there are large rock masses, water flows, soft soil, etc. underground, corresponding foundation treatment is required, otherwise it will cause great difficulties for the construction. 2) Space limitations: 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 opening of the pipe wall. 3. Construction safety: Pipe jacking construction needs to be carried out underground. 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, it is urgent to invent a large-diameter shield ventilation shaft system construction method with fast construction speed, high construction safety, and outstanding economic and technical benefits. The present invention proposes a large-diameter shield ventilation shaft system construction method through experimental research, construction materials and construction method comparison, and combines and adopts new components such as steel-concrete prefabricated pedestal, reaction support seat steel frame, roller hydraulic jack, arc support plate, arc water-stop steel plate, etc., and has been verified by multiple projects, which can provide certain technical references for tunnel engineering and has good economic and technical benefits. Summary of the invention

[0005] The object of the present invention is to provide a steel caisson micro-jacking pipe and a construction method for solving the above-mentioned technical problems.

[0006] In order to solve the above technical problems, the present invention provides a construction method of a steel caisson micro-jacking pipe, comprising the following steps:

[0007] S1. Measurement and layout, prefabricated steel casing entering the site: Measurement and layout determine the caisson construction position, and close the easy-opening and closing device in the first section of the steel casing. At the same time, the steel-concrete composite bottom plate is tied and fixed to the wall hook through the steel wire rope;

[0008] S2. Preliminary excavation of foundation pit, and entry of pipe shaking equipment: excavation of foundation pit to the depth of the first section of steel casing;

[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 foundation pit, the pipe shaking machine is installed on the first section of steel casing and fixed to the ground, and the second section of steel casing is spliced ​​and raised with the first section of steel casing;

[0010] S4. The steel tube is mechanically sunk, and the steel casing is repeatedly connected to the designed elevation: the tube shaking machine is started to make the steel casing sink, and the steel casing is repeatedly connected to the designed elevation;

[0011] S5. High-pressure rotary jetting to reinforce the pit bottom and lower the steel-concrete composite bottom seal: After the steel casing is sunk to the designed elevation, firstly, the pit bottom is reinforced with full-volume high-pressure rotary jetting piles, then the edge of the steel-concrete composite bottom seal plate is covered with a water-expandable rubber sleeve, and finally, the steel wire rope is untied to lower the steel-concrete composite bottom seal plate to complete the steel-concrete composite bottom seal of the caisson;

[0012] S6. Install the annular water collecting tank, hoist the guide frame and the pipe jacking machine: Use the hook on the wall of the first section of the steel casing to install the annular hanger, and install the annular water collecting tank in the annular hanger, and then hoist the ribbed reinforced guide frame and the pipe jacking machine in turn;

[0013] S7. Install temporary steel inner support and open the opening and closing: install temporary steel inner support 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 rear backrest of the guide frame with the connecting ring of the easy opening and closing device on one side;

[0014] S8, micro-pipe jacking construction: start the pipe jacking machine to push the pilot pipe into the receiving well, connect the black pipe, install the extrusion and expansion machine head at the tail end of the black pipe, hoist the resin concrete pipe behind the black pipe and push it in section by section to form a concrete pipe;

[0015] S9. Dismantling of construction equipment and pouring of double casing formwork inspection well: After the installation of the concrete pipe is completed, the temporary steel inner support is removed, and the construction equipment in the caisson is hoisted out one by one, the annular hanger and the annular water collecting tank are recovered, and the steel ring formwork is installed on the connecting ring of the easy opening and closing device. Then the internal steel casing is hoisted, and the inspection well concrete is poured. After the concrete has initially set, the internal steel casing is pulled out to complete the construction.

[0016] The beneficial effects of the present invention are:

[0017] 1. The present invention improves the stability of the caisson wall by arranging a single or multiple temporary steel inner supports in the upper space of the steel casing caisson, and the temporary steel inner supports mainly use electric jacks to achieve pressure support, which is convenient and fast. At the same time, the setting of the main support ring also facilitates the temporary lifting of equipment in the well.

[0018] 2. The present invention connects a plurality of fan-shaped steel-concrete composite plates by arranging hinge balls on the inner wall of the steel casing to achieve rapid bottom sealing of the well. At the same time, a blade edge design is adopted to reduce the rotation and sinking resistance of the steel casing. Compared with the traditional cast-in-place concrete bottom sealing, the on-site construction efficiency is greatly improved, and the bottom sealing construction quality in a small space is also ensured.

[0019] 3. The present invention directly uses the caisson steel casing and the built-in steel casing as the inspection well construction template on site, which is efficient and fast. At the same time, the built-in steel casing is recovered after the initial setting of the inspection well concrete, and reused to reduce construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0021] Figure 2 The present invention Figure 1 AA section view;

[0022] Figure 3 The present invention Figure 1 BB cross-section diagram;

[0023] Figure 4 This is a schematic diagram of the installation of the annular hanger of the present invention;

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

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

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

[0027] Figure 8 It is a schematic diagram of the casting structure of the double casing formwork inspection well of the present invention.

[0028] In the figure: 1-original foundation soil; 2-steel casing; 3-main support ring; 4-electric jacking device; 5-vertical arc support plate; 6-compression grouting area; 7-reinforcement rib plate; 8-guide frame; 9-annular water collecting tank; 10-base; 11-full-chamber high-pressure rotary jet pile; 12-steel-concrete composite plate; 13-closed cover plate; 14-annular hanger; 15-rubber sealing ring; 16-connecting ring; 17-bolt hole; 18-hinge shaft; 19-anchor bolt; 20-steel wire rope; 21-hinge ball; 22-steel ring template; 23-water-swelling rubber sleeve; 24-lifting ring; 25-arc rear backrest; 26-inspection well; 27-built-in steel casing; 28-sensing line; 29-jacking machine; 30-concrete pipe; 31-hook. DETAILED DESCRIPTION

[0029] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0030] Those skilled in the art should understand that, in the disclosure of the present invention, the orientation or position relationship indicated by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

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

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

[0033] S1. Measurement and layout, and the prefabricated steel casing 2 is brought into the site: the caisson construction position is determined by measurement and layout, the appearance quality of the steel casing 2 is checked, and the easy-opening and closing device in the first section of the steel casing 2 is closed. At the same time, the steel-concrete composite bottom plate is tied and fixed to the wall hook through the steel wire rope 20.

[0034] In this step, if Figure 7 As shown, the easy opening and closing device includes a connecting ring 16, a closed 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 closed 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 closed cover plate 13 and the connecting ring 16 are connected through the anchor bolts 19. The edges of the connecting ring 16 and the closed cover plate 13 are both arc-shaped structures, and the arc is coupled to the inner wall of the steel casing 2. The connecting ring 16 is circumferentially provided with a plurality of bolt holes 17 corresponding to the anchor bolts 19, so that after the closed cover plate 13 is rotated to cover the connecting ring 16, the anchor bolts 19 are connected to the bolt holes 17 to tighten the connecting ring 16 and the closed cover plate 13.

[0035] like Figure 3As shown, the steel-concrete composite bottom plate is composed of a plurality of fan-shaped steel-concrete composite plates 12, the edges of the fan-shaped steel-concrete composite plates 12 are all provided 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 the steel casing 2 through a single hinge ball 21, and a lifting ring 24 is provided at the center of the steel-concrete composite bottom plate and at the end of the fan-shaped steel-concrete composite plate 12, and the steel wire rope 20 is connected to the lifting ring 24 and passed through the hinge ball 21, so that when the steel wire rope 20 is hoisted, it can be rotated through the hinge ball 21.

[0036] S2. Preliminary excavation of foundation pit and entry of pipe-shaking machine equipment: Manually excavate the foundation pit to the depth of the first section of steel casing 2, and simultaneously arrange for the entry of pipe-shaking machine equipment 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 and raised: hoist the first section of steel casing 2 into the foundation pit, check the sealing of the easy opening and closing device and the tightness of the steel wire rope 20, and after the inspection is qualified, install the pipe shaking machine equipment on the first section of steel casing 2 and fix it to the ground, and at the same time weld the second section of steel casing 2 to the first section of steel casing 2 to splice and raise it.

[0038] S4. The steel tube is mechanically sunk, and the steel casing 2 is repeatedly connected to the designed elevation: the tube shaking machine is started to make the steel casing 2 sink at a uniform speed, and the remaining steel casing 2 is repeatedly welded to the designed elevation.

[0039] S5. Reinforce the pit bottom with high-pressure rotary jetting and lower the steel-concrete composite bottom seal: After the steel casing 2 sinks to the designed elevation, first reinforce the pit bottom with full-volume high-pressure rotary jetting piles 11, then set the edge of the steel-concrete composite bottom seal plate with a water-swellable rubber sleeve 23, and finally untie the steel wire rope 20 to lower the steel-concrete composite bottom seal plate to complete the steel-concrete composite bottom seal of the caisson.

[0040] S6. Install the annular water collecting tank 9, hoist the guide frame 8 and the pipe jacking machine 29: Use the wall hook 31 of the first section of the steel casing 2 to install the annular hanger 14, and install the annular water collecting tank 9 in the annular hanger 14, and then hoist the ribbed reinforced guide frame 8 and the pipe jacking machine 29 in turn.

[0041] In this step, if Figure 4 , Figure 5 As shown, a rubber sealing ring 15 is provided between the annular water collecting box 9 and the inner wall of the first section of the steel casing 2, and the two sides of the annular water collecting box 9 are placed in two adjacent annular hangers 14, and the annular hangers 14 are generally U-shaped structures so that the two adjacent annular hangers 14 are spliced ​​to form an annular structure.

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

[0043] The bottom of the ribbed reinforced guide frame 8 is placed on the steel-concrete composite bottom plate through a plurality of bases 10 .

[0044] S7. Install temporary steel inner support and open the opening and closing: install temporary steel inner support on the wall of the upper steel casing 2, open the easy opening and closing devices on both sides of the first section of the steel casing 2, adjust the position of the guide frame 8 and the jacking machine 29, and anchor the curved rear 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, if Figure 2 As shown, the temporary steel inner 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 an annular direction. A vertical arc support plate 5 is arranged at the end of the electric jack 4, and the vertical arc support plate 5 is supported on the inner wall of the steel casing 2.

[0046] Among them, a plurality of electric lifters 4 are connected to each other by a communication line 28 , so that the plurality of electric lifters 4 can synchronously push the vertical arc-shaped support plate 5 to ensure the stability of the main support ring 3 .

[0047] S8, micro pipe jacking construction: start the pipe jacking machine 29 to push the pilot pipe into the receiving well according to the designed trajectory, connect the black pipe, install a simple extrusion and expansion machine head at the tail end of the black pipe, hoist the resin concrete pipe at the rear and push it in section by section to form a concrete pipe 30.

[0048] S9. Dismantling of construction equipment and pouring of double casing formwork inspection well 26: After the installation of concrete pipe 30 is completed, the temporary steel inner support is removed, and the construction equipment in the caisson is hoisted out in turn, the annular hanger 14 and the annular water collecting tank 9 are recovered, and the steel ring formwork 22 is installed on the easy opening and closing device connecting ring 16, and then the built-in steel casing 27 is hoisted, and the concrete of the inspection well 26 is poured. After the concrete is initially set, the built-in steel casing 27 is pulled out to complete the construction.

[0049] In this step, if 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 lower side of the original foundation soil 1 and the outer periphery of the steel casing 2 are filled with a compaction grouting area 6 so that the compaction grouting area 6 wraps around the outer side of the steel casing 2 and the concrete pipe 30 .

[0051] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present invention.

Claims

1. A construction method for a steel caisson micro-jacking pipe, characterized in that: The following steps are involved: S1, measurement and layout, prefabricated steel casing (2) entering the site: measurement and layout to determine the caisson construction position, and close the easy-opening and closing device in the first section of the steel casing (2), and at the same time, the steel-concrete composite bottom plate is tied and fixed to the wall hook through the steel wire rope (20); S2. Preliminary excavation of foundation pit, entry of pipe shaking equipment: excavation of foundation pit to the depth of the first section of steel casing (2); S3, hoisting the first section of steel casing (2) into the pit, and raising the second section of steel casing (2): hoisting the first section of steel casing (2) into the foundation pit, installing the pipe shaking machine on the first section of steel casing (2) and fixing it to the ground, and at the same time splicing the second section of steel casing (2) with the first section of steel casing (2) and raising it; S4, the steel tube is mechanically sunk, and the steel casing (2) is repeatedly connected to the designed elevation: the tube shaking machine is started to make the steel casing (2) sink, and the steel casing (2) is repeatedly connected to the designed elevation; S5, high-pressure rotary grouting to reinforce the pit bottom and lower the steel-concrete composite bottom seal: after the steel casing (2) is sunk to the designed elevation, the pit bottom is first reinforced with full-height high-pressure rotary grouting piles (11), and then a water-swellable rubber sleeve (23) is set on the edge of the steel-concrete composite bottom seal plate, and finally the steel wire rope (20) is untied to lower the steel-concrete composite bottom seal plate to complete the steel-concrete composite bottom seal of the caisson; S6, installing the annular water collecting box (9), hoisting the guide frame (8) and the pipe jacking machine (29): using the wall hook (31) of the first section of the steel casing (2) to install the annular hanging frame (14), and installing the annular water collecting box (9) in the annular hanging frame (14), and then hoisting the ribbed reinforced guide frame (8) and the pipe jacking machine (29) in sequence; S7, install temporary steel inner support and open the opening and closing: install temporary steel inner support on the wall of the steel casing (2), open the easy opening and closing devices 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 rear backrest (25) of the guide frame (8) to the connecting ring (16) of the easy opening and closing device on one side; S8, micro-pipe jacking construction: start the pipe jacking machine (29) to push the pilot pipe into the receiving well, connect the black pipe, install the expansion machine head at the tail end of the black pipe, hang the resin concrete pipe behind the black pipe and push it in section by section to form a concrete pipe (30); S9, dismantling of construction equipment, pouring of double casing formwork inspection well (26): after the installation of the concrete pipe (30) is completed, the temporary steel inner support is dismantled, and the construction equipment in the caisson is hoisted out in sequence, the annular hanger (14) and the annular water collecting tank (9) are recovered, and the steel ring formwork (22) is installed on the easy opening and closing device connecting ring (16), and then the internal steel casing (27) is hoisted, and the concrete of the inspection well (26) is poured. After the concrete is initially set, the internal steel casing (27) is pulled out to complete the construction.

2. The construction method of steel caisson micro-jacking pipe according to claim 1 is characterized in that: The easy-opening and closing device comprises a connecting ring (16) and a closed 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 closed cover plate (13) is rotatably connected to the inner wall of the first section of the steel casing (2) via a hinge shaft (18); the edges of the connecting ring (16) and the closed 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 steel caisson micro-jacking pipe according to claim 2 is characterized in that: The closed cover plate (13) and the connecting ring (16) are connected via anchor bolts (19), and the connecting ring (16) is provided with a plurality of bolt holes (17) corresponding to the anchor bolts (19) along the circumferential direction, so that after the closed cover plate (13) is rotated to cover the connecting ring (16), the anchor bolts (19) are connected to the bolt holes (17).

4. The construction method of steel caisson micro-jacking pipe according to claim 1 is characterized in that: The steel-concrete composite bottom plate is composed of a plurality of fan-shaped steel-concrete composite plates (12) spliced ​​together, the edges of the fan-shaped steel-concrete composite plates (12) are all provided 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 the steel casing (2) through a hinge ball (21), and a lifting ring (24) is provided at the center of the steel-concrete composite bottom plate and at the end of the fan-shaped steel-concrete composite plate (12), and a steel wire rope (20) is connected to the lifting ring (24) and passed through the hinge ball (21).

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

6. The construction method of steel caisson micro-jacking pipe according to claim 1, characterized in that: The rib-reinforced guide frame (8) is provided with an arc-shaped rear backrest (25), and a plurality of reinforcing ribs (7) are vertically arranged at equal intervals on the top of the arc-shaped rear backrest (25).

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

8. The construction method of steel caisson micro-jacking pipe according to claim 1, characterized in that: The temporary steel inner support comprises a main support ring (3), an electric jack (4) and a vertical arc-shaped support plate (5). A plurality of electric jacks (4) are evenly arranged on the main support ring (3) in a circumferential direction. A vertical arc-shaped support plate (5) is arranged at the end of the electric jack (4), and the vertical arc-shaped support plate (5) is supported on the inner wall of the steel casing (2).

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

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