Pier water beam lifting precast down installation system and construction method

Abstract

The application provides a pier water tie beam lifting prefabrication under-hanging installation system and construction method, which comprises the following steps: construction of pile foundation; installation of prefabrication platform vertical component; installation of prefabrication platform upper structure; construction of tie beam prefabrication part; installation of cofferdam plate; hoisting of prefabricated beam and cofferdam; construction of bottom sealing concrete and waterproofing; cofferdam internal drainage; water in the cofferdam is pumped out to keep the cofferdam dry; construction of cast-in-situ tie beam joint; and removal of the cofferdam and formwork. The intermediate section of the tie beam is lifted and prefabricated, and the two end joints of the tie beam are cast in-situ in water, so that the prefabrication and cast-in-situ of the tie beam are organically combined, the construction quality and efficiency of the tie beam are ensured, the cofferdam plate, the tie beam and the tie beam formwork and the joint formwork are lowered as a whole structure, the cast-in-situ in water of the two end joints of the tie beam is realized, the integrated operation level is improved, the construction difficulty of the cofferdam is reduced, the installation and removal time of the cofferdam is reduced, and a reliable and safe construction operation environment can be provided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water tie beam, in particular to a bridge pier water tie beam lifting precast hoisting installation system and construction method. BACKGROUND

[0002] In the bridge pier engineering, the water tie beam of the bridge pier pile foundation is a beam in water connecting the pile foundations together. The conventional construction method mainly includes the island method of shallow cofferdam and the steel sheet pile cofferdam method. The cofferdam is used to form a closed system without water inside, so as to ensure the construction safety of the operating personnel and the tie beam is formed by one-time casting. According to the construction idea, the cofferdam is required to be built before the construction, and then the concrete is used to seal the bottom to form the dry construction environment under water. This method has been used for many years in China and has been proved to be suitable for the construction of large underwater structures. However, for the underwater structures with shallow water depth, the above method is more complex in operation, has more auxiliary processes, has a long construction period of the cofferdam, has a large construction cost, has many unsafe factors and has a large construction risk. Obviously, it is not suitable in terms of social and economic benefits. SUMMARY

[0003] The purpose of the present application is to provide a bridge pier water tie beam lifting precast hoisting installation system and construction method which can ensure the construction efficiency and quality of the tie beam.

[0004] To solve the above technical problems, the present application provides a construction method of a bridge pier water tie beam lifting precast hoisting installation system, which comprises the following steps:

[0005] Step one, construction of pile foundation: the bridge pier pile foundation is constructed, the embedded pipe is reserved at the set position of the pile foundation, and the support frame is installed on the embedded pipe;

[0006] Step two, installation of vertical components of precast platform: the platform support pile, the steel pipe pile and the auxiliary components are installed at the set position, the platform support pile is the main vertical component of the support platform, and the steel pipe pile is the auxiliary vertical component;

[0007] Step three, installation of the upper structure of the precast platform: the distribution beam, the Bailey beam, the platform plate and the winch are sequentially installed on the top of the platform support pile and the steel pipe pile, and the stiffening rib is installed at the connection position of the distribution beam and the platform support pile;

[0008] Step four, construction of the precast part of the tie beam: the precast tie beam formwork is installed on the platform plate, and the precast tie beam is poured;

[0009] Step five, installation of cofferdam plate: the cofferdam plate and the connecting rib are installed at both ends of the tie beam formwork, and the precast segment formwork is removed after the strength of the precast tie beam reaches the set strength;

[0010] Step six, hoist the precast beam and cofferdam: use the winch on the platform to hoist the precast beam, cofferdam plate, beam formwork as a whole to the beam setting position;

[0011] Step seven, construction of bottom sealing concrete and waterproofing: fill the first water stop in the gap between the cofferdam lower end of the embedded plate and the pile foundation, fill the second water stop in the gap between the saddle plate and the pile foundation, and pour concrete in the embedded plate;

[0012] Step eight, cofferdam drainage: drain the water in the cofferdam to keep it dry;

[0013] Step nine, construction of cast-in-place beam joints: pour the cast-in-place beam joints at the top of the pile foundation and the two ends of the beam in the dry environment surrounded by the cofferdam and the formwork;

[0014] Step ten, remove the cofferdam and formwork: remove the cofferdam, formwork and auxiliary components, and carry out the next cycle of beam construction.

[0015] The beneficial effects of the present application are:

[0016] (1) The middle section of the beam is lifted and precast in the present application, which provides a good construction environment for precast conditions, and organically combines beam precast and cast-in-place to ensure beam construction quality and efficiency.

[0017] (2) The cofferdam plate, beam and beam formwork, and joint formwork are used as a whole structure in the present application, which is used as a water-based system for cast-in-place of beam joints at both ends. This structure is easy to hoist and implement integrated operation, and improves the waterproof effect of the system and ensures the dry environment during cast-in-place of beam joints.

[0018] (3) The embedded plate at the lower end of the cofferdam plate is filled with bottom sealing concrete, which improves the sealing and waterproof performance of the cofferdam plate.

[0019] (4) The steel pipe pile system is set as an auxiliary bearing structure of the precast platform and the cast-in-place beam system, which improves the overall stability of the structure.

[0020] (5) The pile foundation pre-buried pipe is used as the bearing point of the cofferdam to ensure the reliable fixation of the cofferdam.

[0021] (6) When the middle section of the beam is precast, the formwork of the precast section is installed to reserve the shape of the two end joints, which ensures the accuracy of the structure size of the middle section of the beam. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is the operation schematic diagram of the bridge pier water beam lifting and precast lowering and installation system;

[0023] Figure 2 is Figure 1A plan view of the pile foundation and the vertical support structure;

[0024] Figure 3 is a prefabrication schematic diagram of the middle segment of the tie beam;

[0025] Figure 4 is a plan view of the connection of the tie beam formwork and the cofferdam plate;

[0026] Figure 5 is Figure 4 a plan view after the prefabricated segment formwork is removed;

[0027] Figure 6 is a plan view of the prefabricated middle segment of the tie beam;

[0028] Figure 7 is a schematic diagram of the cofferdam plate installation completion.

[0029] In the drawings, the components represented by each reference numeral are listed as follows:

[0030] 1-pile foundation; 2-tie beam; 3-prefabricated tie beam; 4-cast-in-place tie beam joint; 5-Bailey beam; 6-platform plate; 7-distribution beam; 8-platform support pile; 9-stiffening rib; 10-steel pipe pile; 11-coupling beam; 12-steel base; 13-flange plate; 14-support beam; 15-triangle strut; 16-connecting beam; 17-support stool; 18-tie beam formwork; 19-prefabricated segment formwork; 20-tie beam joint to be poured; 21-cofferdam plate; 22-connecting rib; 23-joint formwork; 24-horseback plate; 25-hoisting point rib plate; 26-embedded plate; 27-first water stop; 28-bottom sealing concrete; 29-second water stop; 30-tie beam bottom formwork; 31-tie beam top formwork; 32-tie beam reinforcement; 33-pile foundation reserved reinforcement; 34-water surface; 35-main hoisting rod; 36-assistant hoisting rod; 37-winch; 38-embedded pipe; 39-support frame; 40-jack. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0032] It is to be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like as used herein with reference to the orientation or position of an item refer to the orientation or position shown in the drawings, which is merely for purposes of illustration and description and is not meant in any way to restrict or limit the scope of the present application, and thus such terms are not to be interpreted as indicating or implying particular orientations or configurations of the items shown and described.

[0033] It is to be understood that the term "one" is to be understood as "at least one" or "one or more" such that a quantity of the elements can be either one or more than one. The term "one" is not to be interpreted as limiting the quantity to only one element.

[0034] As Figures 1-7 The present application provides a construction method of a pier water tie beam lifting precast lower installation system, comprising the following steps:

[0035] Step one, construction of pile foundation 1: construction of pier pile foundation 1, reserved pre-embedded pipe 38 at the set position of pile foundation 1, and installation of support frame 39 on pre-embedded pipe 38.

[0036] Step two, installation of precast platform vertical member: installation of platform support pile 8, steel pipe pile 10 and auxiliary member at the set position, platform support pile 8 being the main vertical member of the support platform, and steel pipe pile 10 being the auxiliary vertical member.

[0037] Step three, installation of precast platform upper structure: installation of distribution beam 7, Bailey beam 5, platform plate 6 and winch 37 in sequence on the top of platform support pile 8 and steel pipe pile 10, and installation of stiffener 9 at the connection between distribution beam 7 and platform support pile 8.

[0038] Step four, construction of tie beam 2 precast part: installation of precast tie beam 3 formwork on platform plate 6, and pouring of precast tie beam 3.

[0039] Step five, installation of cofferdam plate 21: installation of cofferdam plate 21 and connecting rib 22 at both ends of tie beam formwork 18, and removal of precast segment formwork 19 after the strength of precast tie beam 3 reaches the set strength.

[0040] Step six, hoisting of precast beam and cofferdam: using winch 37 on platform plate 6, precast tie beam 3, cofferdam plate 21 and tie beam formwork 18 are hoisted as a whole to the set position of tie beam 2.

[0041] Step 7: Constructing the bottom sealing concrete 28 and waterproofing: Fill the gap between the inner plate 26 at the lower end of the cofferdam and the pile foundation 1 with the first waterstop strip 27, fill the gap between the saddle plate 24 and the pile foundation 1 with the second waterstop strip 29, and pour concrete inside the inner plate 26.

[0042] Step 8: Draining water from the cofferdam: Pump out the water from the cofferdam to keep it dry.

[0043] Step 9: Construct cast-in-place tie beam node 4: In the dry environment enclosed by the cofferdam and formwork, cast-in-place tie beam node 4 is constructed at the top of pile foundation 1 and both ends of tie beam 2.

[0044] Step 10: Remove the cofferdam and formwork: Remove the cofferdam, formwork and auxiliary components, and start the construction of the next cycle of tie beam 2.

[0045] Among them, the prefabricated and suspended installation system for the underwater tie beams of the bridge piers is a symmetrical structure.

[0046] The tie beam 2 is composed of a precast tie beam 3 and a cast-in-place tie beam node 4. The precast tie beam 3 is cast on the platform slab 6. During the casting process, the shape of the tie beam node 20 to be cast is reserved by the precast segment template 19.

[0047] Specifically, the precast segment template 19 is located at both ends of the precast tie beam 3, and the precast segment template 19 has a ring structure.

[0048] The cofferdam plate 21 is a box-shaped structure, which is connected to the tie beam template 18 through the connecting rib 22. The bottom of the cofferdam plate 21 is a hollow structure to cooperate with the pile foundation 1. The end of the tie beam template 18 extends into the cofferdam plate 21. The tie beam top template 31 and tie beam bottom template 30 are respectively connected to the cofferdam plate 21. At the same time, the cofferdam plate 21 has a node template 23 to cooperate with the tie beam node 20 to be poured. The node template 23 is connected to the cofferdam plate 21 or the tie beam template 18.

[0049] Specifically, the precast segment template 19 is built into both ends of the tie beam template 18, the precast tie beam 3 is filled between the two adjacent precast segment templates 19 and the tie beam template 18, and the pile foundation 1 passes through the hollow structure at the bottom of the cofferdam slab 21.

[0050] The lower end of the cofferdam plate 21 has an inner plate 26. The inner plate 26 fits with the outer diameter of the pile foundation 1 and leaves a certain gap. A first waterstop strip 27 is installed in the gap between the inner plate 26 and the pile foundation 1, and the bottom sealing concrete 28 is filled between the inner plate 26 and the pile foundation 1. A closed space is formed between the pile foundation 1 and the cofferdam plate 21. The cofferdam plate 21 forms a closed structure relative to the external water area to achieve a dry construction environment for the cast-in-place tie beam node 4.

[0051] The cofferdam 21, tie beam 2, tie beam formwork 18 and node formwork 23 are hoisted and lowered together as an underwater casting system for the tie beam 2 node as an integral structure. The integral structure is supported by jacks 40 on the support frame 39. The upper part of the cofferdam 21 is an open structure in the middle. The top elevation of the cofferdam 21 is higher than the water surface 34 elevation. The cofferdam 21 is connected to the main hoist 35 and the auxiliary hoist 36 through the hoisting point rib plate 25. The main hoist 35 is directly connected to the winch 37.

[0052] Specifically, a pre-embedded pipe 38 is reserved at the set position of the pile foundation 1, and a support frame 39 is installed on the pre-embedded pipe 38. The auxiliary hanger 36 has a "π" shaped structure so that the two ends of the auxiliary hanger 36 in the horizontal direction are connected to the main hangers 35 on both sides, and the two ends of the auxiliary hanger 36 in the vertical direction are connected to the two sides of the middle open structure above the cofferdam plate 21. The cofferdam plate 21 is fixed to the main hanger 35 through the lifting point rib plate 25.

[0053] Adjacent steel pipe piles 10 are connected by a connecting beam 11. A steel seat 12 is provided in the middle of two adjacent steel pipe piles 10. The supporting beam 14 is fixed to the flange plate 13 through the steel seat 12. The supporting beam 14 supports the bottom formwork 30 of the tie beam and bears the upper load of the bottom formwork. The top of the steel pipe pile 10 is provided with a triangular brace 15 and a connecting beam 16. A supporting stool 17 is provided on the connecting beam 16, which supports and bears the upper platform. This steel pipe pile 10 system is a secondary load-bearing system that serves as an auxiliary load-bearing system.

[0054] The flange plate 13 is located between the steel base 12 and the support beam 14 to ensure a stable connection between the steel base 12 and the support beam 14.

[0055] The precast tie beam 3 has precast tie beam reinforcement 32 at both ends and precast pile foundation reinforcement 33 anchored together.

[0056] 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 prefabricated and suspended installation system for raising the underwater tie beam of a bridge pier, characterized in that, Includes the following steps: Step 1, Construction of pile foundation (1): Construction of pier pile foundation (1), pre-embedded pipe (38) is reserved at the set position of pile foundation (1), and support frame (39) is installed on the pre-embedded pipe (38); Step 2: Install the prefabricated platform vertical components: Install the platform support piles (8), steel pipe piles (10) and auxiliary components at the designated positions. The platform support piles (8) are the main vertical components that support the platform, and the steel pipe piles (10) are auxiliary vertical components. Step 3: Install the upper structure of the precast platform: Install the distribution beam (7), Bailey beam (5), platform plate (6), and winch (37) in sequence on the top of the platform support pile (8) and steel pipe pile (10). Install stiffening ribs (9) at the connection between the distribution beam (7) and the platform support pile (8). Step 4: Construction of the precast tie beam (2): Install the precast tie beam (3) template on the platform slab (6) and pour the precast tie beam (3); The tie beam (2) consists of a precast tie beam (3) and a cast-in-place tie beam node (4). When the precast tie beam (3) is poured, the shape of the tie beam node (20) to be poured is reserved by the precast segment template (19). Step 5: Install cofferdam panels (21): Install cofferdam panels (21) and connecting ribs (22) at both ends of the tie beam template (18). After the precast tie beam (3) reaches the set strength, remove the precast segment template (19). The cofferdam slab (21) is a box-shaped structure, which is connected to the tie beam template (18) through connecting ribs (22). The bottom of the cofferdam slab (21) is a hollow structure to cooperate with the pile foundation (1). The end of the tie beam template (18) extends into the cofferdam slab (21). The tie beam top template (31) and tie beam bottom template (30) are respectively connected to the cofferdam slab (21). At the same time, the cofferdam slab (21) has a node template (23) to cooperate with the tie beam node (20) to be poured. The node template (23) is connected to the cofferdam slab (21) or the tie beam template (18). Step 6: Hoisting the precast beams and cofferdam: Using the winch (37) on the platform plate (6), the precast tie beam (3), cofferdam plate (21), and tie beam template (18) are hoisted as a whole to the set position of the tie beam (2); Step 7: Constructing the bottom sealing concrete (28) and waterproofing: Fill the gap between the inner plate (26) at the lower end of the cofferdam and the pile foundation (1) with the first waterstop strip (27), fill the gap between the saddle plate (24) and the pile foundation (1) with the second waterstop strip (29), and pour concrete into the inner plate (26). Step 8: Draining water from the cofferdam: Pump out the water from the cofferdam and keep the area inside the cofferdam dry; Step 9: Construct the cast-in-place tie beam joint (4): In the dry environment enclosed by the cofferdam and the formwork, pour the cast-in-place tie beam joint (4) at the top of the pile foundation (1) and both ends of the tie beam (2); Step 10: Remove the cofferdam and formwork: Remove the cofferdam, formwork and auxiliary components, and carry out the construction of the next cycle tie beam (2).

2. The construction method of the prefabricated and suspended installation system for raising the underwater tie beam of the bridge pier according to claim 1, characterized in that: The prefabricated and suspended installation system for the underwater tie beams of the bridge piers is a symmetrical structure.

3. The construction method of the prefabricated and suspended installation system for raising the underwater tie beam of the bridge pier according to claim 1, characterized in that: The lower end of the cofferdam plate (21) has an inner plate (26). The inner plate (26) fits with the outer diameter of the pile foundation (1) and leaves a gap. A first waterstop strip (27) is installed in the gap between the inner plate (26) and the pile foundation (1). The bottom sealing concrete (28) is filled between the inner plate (26) and the pile foundation (1). A closed space is formed between the pile foundation (1) and the cofferdam plate (21). The cofferdam plate (21) forms a closed structure relative to the external water area.

4. The construction method of the prefabricated and suspended installation system for raising the underwater tie beam of the bridge pier according to claim 1, characterized in that: The cofferdam slab (21), tie beam (2), tie beam template (18) and node template (23) are a whole structure, which are hoisted and lowered together as the underwater casting system of the tie beam (2) node. The whole structure is supported by jacks (40) on the support frame (39). The upper part of the cofferdam slab (21) is an open structure in the middle. The top elevation of the cofferdam slab (21) is greater than the elevation of the water surface (34). The cofferdam slab (21) is connected to the main hoist (35) and the auxiliary hoist (36) through the hoisting point rib plate (25). The main hoist (35) is directly connected to the winch (37).

5. The construction method of the prefabricated and suspended installation system for raising the underwater tie beam of the bridge pier according to claim 1, characterized in that: The middle of two adjacent steel pipe piles (10) is connected by a connecting beam (11). A steel seat (12) is provided in the middle of two adjacent steel pipe piles (10). The supporting beam (14) is fixed by the steel seat (12) and the flange plate (13). The bottom formwork (30) of the tie beam is supported by the supporting beam (14) and bears the upper load of the bottom formwork. The top of the steel pipe pile (10) is provided with a triangular brace (15) and a connecting beam (16). A supporting stool (17) is provided on the connecting beam (16). The upper platform is supported by the supporting stool (17).

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