CN113308952B - Construction method of fabricated retaining wall bridgehead foam concrete light embankment - Google Patents

Abstract

The invention relates to a construction method of an assembled type retaining wall bridgehead foam concrete light embankment, which comprises the following steps: 1) Prefabricating a component; 2) Constructing a strip foundation cushion layer; 3) Assembling construction of the assembled strip-shaped concrete foundation; 4) Constructing a vertical frame system of the stand column; 5) Assembling an assembled type protecting wall; 6) Supporting a formwork at one side of the deformation joint; 7) Pouring foam concrete; 8) Carrying out concrete coping construction; 9) And (5) plastering the reserved notch of the protective wall. The invention has the beneficial effects that: the prefabricated assembly type strip-shaped concrete foundation adopts a tongue-and-groove lapping anchor ground technology, and grouting reinforcement is performed when foundations at two ends are assembled, so that the foundation construction efficiency is greatly improved; the follow-up installation steel pipe stand of the pre-buried sleeve of bar basis is gone and is formed vertical frame system to inlay installation assembled dado fast through this system, steel pipe stand and dado reserve the accurate location of notch, improved efficiency of construction and construction quality.

Description

Construction Method of Foam Concrete Lightweight Embankment of Prefabricated Wall Bridge Head

technical field

The invention relates to a construction method of a foam concrete lightweight embankment at a bridgehead with an assembled wall protection, which is mainly suitable for the construction of a lightweight embankment at a bridgehead section.

Background technique

With the rapid development of road and bridge construction in various parts of my country, the number of road structures such as bridges and culverts in the process of road and bridge construction is also increasing. Instability and other engineering problems have seriously affected the economic benefits of highway construction. Lightweight foam concrete is a new type of lightweight filling material that has been applied to the field of highway engineering in recent years. It has the characteristics of light weight, high strength, strong fluidity, good self-support, and convenient construction. is also becoming more widespread.

The use of lightweight foam concrete can not only solve the foundation settlement and the uneven settlement of structures, but also effectively avoid the occurrence of vehicle jumping at the bridge head. The abutment back filling provides a new technology, but when this technology is constructed, the abutment retaining wall is generally in the form of brick or cast-in-place concrete, and subsequent construction can only be carried out after the maintenance reaches a certain strength. Engineering construction is becoming more and more widespread, and the construction quality and construction efficiency can be greatly accelerated through assembly technology.

In view of this, in order to improve the construction quality and construction efficiency of the foam concrete light embankment at the bridge head, give full play to the advantages of foam concrete and cooperate with the latest assembly technology, it is urgent to invent a simple and effective construction of the foam concrete light embankment at the bridge head with retaining walls method.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art, provide a construction method of the foam concrete lightweight embankment at the head of the bridge retaining wall, improve the construction quality and construction efficiency of the foam concrete light embankment at the bridge head, and have better technical and economic benefits .

This prefabricated retaining wall bridge head foam concrete lightweight embankment includes pile-column abutment, strip foundation cushion, fabricated strip concrete foundation, fabricated retaining wall, pre-embedded hoop for retaining wall, foam concrete, concrete capping, steel pipe column, Foam plastic board and filled soil subgrade, one side of the pile-type abutment is provided with a prefabricated strip concrete foundation, the lower part of the prefabricated strip concrete foundation is provided with a strip base cushion, and the strip base cushion is provided with pre-embedded rivets. On the fixed assembled strip concrete foundation, the reserved slot on the upper part of the assembled strip concrete foundation is provided with an assembled retaining wall, and the pre-embedded sleeve set on one side of the slot is inserted into the steel pipe column, and the steel pipe column is provided with a tie rod , the steel pipe column and the tie rod are fixed by limit buckles, the upper part of the assembled retaining wall is provided with a concrete top, one side of the assembled retaining wall is provided with a reserved notch corresponding to the steel pipe column, and the upper part of the assembled retaining wall is provided with a pre-buried retaining wall The hoop steel bars are used to fix the pile-type abutment, the single-side formwork system is set in the deformation joint, and the foam concrete is poured between the prefabricated retaining wall and the filled subgrade.

As a preference: the two ends of the prefabricated strip concrete foundation are provided with rebates, pre-embedded steel bars or reserved holes are provided at the rebates, grouting holes are provided on the reserved holes, and strip foundations are provided at the bottom of the prefabricated strip concrete foundation. The rivet holes are connected with the pre-embedded rivets of the strip base cushion.

As a preference: the steel pipe column is embedded in the reserved notch on the prefabricated retaining wall, a temporary scissors brace is arranged on the outside of the tie bar, a temporary diagonal brace is arranged on one side of the temporary scissors brace, and an anchor plate is arranged at the bottom of the temporary diagonal brace. The board is fixed to the original ground by fixing nails.

As a preference: the single-side formwork system includes a foam plastic board, a single-side formwork and a rotary diagonal brace, a foam plastic board is arranged at the deformation joint, a single-side formwork is arranged on the outside of the foam plastic board, and a diagonal brace backing plate is arranged on the single-side formwork , Rotary diagonal braces are set between the original ground and the diagonal brace plate on the one-side formwork, and temporary fixing bolts are set at the bottom of the one-side formwork.

As a preference: it also includes a foam concrete multi-pipe synchronous pouring integral lifting mobile frame, the foam concrete multi-pipe synchronous pouring integral lifting mobile frame is composed of lockable rollers, support rods, telescopic devices, detachable ladders, columns, It is composed of support, construction platform, railing and openable railing. The bottom of the column is equipped with lockable rollers, the middle of the column is equipped with a telescopic device, the columns are provided with braces, the support rods are installed between the telescopic devices, and the upper part of the column is provided with a construction platform. , The upper part of the construction platform is provided with railings, fixed fences are provided between the columns above the construction platform, openable railings are provided at the opening above the construction platform, and detachable ladders are correspondingly provided below the openable railings.

As a preference: the two sides of the concrete topping are provided with topping sizing molds, the sizing molds are provided with pull bolts, the inner formwork of the topping sizing mold is placed on the foam concrete, and the outer formwork is fixed to the inner formwork by the pull bolts .

The construction method of the foam concrete lightweight embankment of the prefabricated retaining bridge head comprises the following steps:

1) Component prefabrication: prefabricated prefabricated strip concrete foundation and prefabricated retaining wall. When the prefabricated strip concrete foundation is prefabricated, pre-embedded sleeves are evenly arranged on the upper part, and pre-embedded steel bars are set at one end of the prefabricated strip concrete foundation, and the other end is set Reserved holes and grouting holes, on the prefabricated retaining wall corresponding to the pre-embedded sleeve set the reserved notch for the retaining wall, and on the prefabricated retaining wall according to the position of the pile abutment, reserve the pre-embedded hoop reinforcement for the retaining wall;

2) Construction of the strip foundation cushion: After the construction of the pile-column abutment is completed, the strip foundation cushion is constructed. Before concrete pouring, pre-embedded rivets are set in the strip foundation cushion according to the positions of the rivet holes reserved for the strip foundation of the fabricated strip concrete foundation. ;

3) Assembled construction of prefabricated strip concrete foundation: According to the tongue-and-groove assembled prefabricated strip concrete foundation, the rivet holes reserved at the bottom of the prefabricated strip concrete foundation are accurately inserted into the pre-embedded rivets, and the rivet holes are reserved in the strip foundation Concrete is poured inside, and steel pipe columns are installed in the pre-embedded sleeve;

4) Construction of the vertical frame system of columns: install horizontal tie rods between steel pipe columns and fix them with limit buckles, install temporary scissors braces on the outside of the tie rods, set temporary diagonal braces outside the temporary scissor braces, and pass the fixing nails at the bottom of the temporary braces fixed on the original ground;

5) Assembling the prefabricated retaining wall: Assemble the prefabricated retaining wall in pieces according to the position of the steel pipe column and the reserved notch of the retaining wall. The steel pipe column and the reserved notch of the retaining wall are matched and connected. The pre-embedded hoop steel bar is bent around the pile-type abutment to form a hoop, and the assembled retaining wall and the pile-type abutment are fixed;

6) Single-side formwork support for deformation joints: set up a single-side formwork at the position where the deformation joint is required, fix the bottom of the one-side formwork to the original ground with temporary fixing bolts, and arrange a layer of foam plastic board along the formwork inside the single-side formwork;

7) Foam concrete pouring: Foam concrete is poured by multi-pipe synchronous pouring integral lifting mobile frame. First, a detachable ladder is installed. After the workers and pouring conduits are in place, the ladder is removed, and the construction platform is moved or raised with the pouring to complete the pouring;

8) Concrete topping construction: After the foam concrete pouring is completed, the topping construction is carried out. The inner formwork of the topping finalized mold is placed on the foam concrete, and the outer formwork is fixed with the inner formwork by the tension bolts. After the installation is completed, paint on the tension bolts. Brush release agent, and pour concrete to form concrete capping;

9) Plastering of the reserved notch of the retaining wall: clear the loose concrete in the reserved notch of the retaining wall and plaster the surface with fine stone concrete of a higher strength grade in the notch.

The beneficial effects of the present invention are:

1. The prefabricated strip concrete foundation adopts the groove-and-groove lap joint anchorage technology, and the two ends of the foundation are assembled and reinforced by grouting, which greatly improves the efficiency of foundation construction.

2. The pre-embedded sleeve of the strip foundation is followed by the installation of steel pipe columns to form a vertical frame system, and the prefabricated retaining wall is quickly inlaid and installed through this system. The steel pipe pillars and the reserved notches of the retaining wall are precisely positioned, which improves construction efficiency and construction quality.

3. Pre-embed hoop steel bars on the prefabricated retaining wall. After the retaining wall is installed, bend the steel bars to both sides of the pile to form a hoop system, which can improve the overall stability of the structure during subsequent concrete pouring.

4. Foam concrete is constructed in sections, and foam plastic boards are installed at the deformation joints together with the formwork to speed up the construction progress.

5. Foam concrete is poured simultaneously by multiple people and multiple pipes on the integrated lifting mobile frame to speed up the construction progress.

6. Concrete topping on the top of the prefabricated retaining wall is constructed using rapid pouring stereotyped molds to ensure construction quality and construction efficiency.

Description of drawings

Fig. 1 is a three-dimensional schematic diagram of the overall structure of the foamed concrete lightweight embankment of the assembled type retaining wall bridge head of the present invention;

Fig. 2 is a sectional view of the foamed concrete lightweight embankment of the assembled type retaining wall bridge head of the present invention;

Fig. 3 is a schematic diagram of the prefabricated strip concrete foundation structure;

Figure 4 is a schematic diagram of the connection between the prefabricated strip concrete foundation and the cushion;

Fig. 5 is a three-dimensional structural diagram of steel pipe column installation;

Figure 6 is an elevation view of the vertical frame system and the retaining hoop;

Fig. 7 is a schematic diagram of the single-side support formwork system of the deformation joint;

Fig. 8 is a structural schematic diagram of an integral lifting mobile frame for simultaneous pouring of multiple pipes of foam concrete.

Explanation of reference signs: 1. Pile-type abutment, 2. Strip foundation cushion, 3. Prefabricated strip concrete foundation, 4. Prefabricated retaining wall, 5. Pre-embedded hoop for retaining wall, 6. Foam concrete, 7. Concrete topping, 8. Road bed, 9. Topping finalization mold, 10. Pull bolts, 11. Temporary scissors bracing, 12. Tie rods, 13. Temporary diagonal bracing, 14. Reservation notch for retaining wall, 15. Steel pipe column , 16. Embedded rivets, 17. Pavement, 18. Rotary diagonal brace, 19. One-sided formwork, 20. Temporary fixing bolts, 21. Foam plastic board, 22. Filled roadbed, 23. Slant brace plate, 24 .Embedded sleeve, 25. Groove, 26. Lockable roller, 27. Support rod, 28. Telescopic device, 29. Detachable ladder, 30. Column, 31. Support, 32. Construction platform, 33 , fence, 34 openable railing, 35, fixed fence, 36. embedded steel bar, 37. reserved hole, 38. limit buckle, 39. original ground, 40. grouting hole, 41. anchor plate, 42. Fixing nails, 43. Reserve rivet holes for strip base.

Detailed ways

The present invention will be further described below in conjunction with the examples. The description of the following examples is provided only to aid the understanding of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, some improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Embodiment one

As shown in Figure 1-2, the foam concrete lightweight embankment of the prefabricated retaining wall bridge head includes pile abutment 1, strip foundation cushion 2, prefabricated strip concrete foundation 3, prefabricated retaining wall 4, and retaining wall pre-embedded hoop 5 , foam concrete 6, concrete topping 7, topping mold 9, steel pipe column 15, rotary diagonal brace 18, one-sided formwork 19, foam plastic board 21, soil filling roadbed 22, etc., the pile abutment 1- The assembled strip concrete foundation 3 is arranged on the side, the strip base cushion 2 is arranged at the lower part of the fabricated strip concrete foundation 3, and the strip base cushion 2 is provided with pre-embedded rivets 16 for fixing the assembled strip concrete foundation 3. The prefabricated retaining wall 4 is set in the reserved notch on the upper part of the bar-shaped concrete foundation 3, and the embedded sleeve 24 set on one side of the notch is built into the steel pipe column 15, and the tie rod 12 is set between the steel pipe column 15, and the two adopt limit Buckle 38 is fixed. The upper part of the prefabricated retaining wall 4 is provided with a concrete topping 7, one side of the prefabricated retaining wall 4 is provided with a reserved notch 14 for the retaining wall corresponding to the steel pipe column 15, and the upper part of the prefabricated retaining wall 4 is provided with pre-embedded hoops 5 steel bars for connecting with the pile type The abutment 1 is fixed, and when the concrete topping 7 is being constructed, a topping-setting mold 9 is set on both sides, and a tie bolt 10 is arranged on the shaping mold 9 .

As shown in Figure 3-4, grooves 25 are provided at both ends of the prefabricated strip concrete foundation 3 for assembly, embedded steel bars 36 or reserved holes 37 are arranged at the grooves 25, and grouting holes 40 are arranged on the reserved holes 37 , the bottom of the prefabricated strip concrete foundation 3 is provided with a rivet hole 43 reserved for the strip base and assembled with the strip base cushion layer 2 .

As shown in FIG. 5 , the embedded sleeve 24 on the prefabricated strip concrete foundation 3 is used to install the steel pipe columns 15 , and the tie rods 12 are arranged between the steel pipe columns 15 , and the two are fixed by a limit buckle 38 .

As shown in Figure 6, the steel pipe column 15 is embedded in the retaining wall reserved notch 14 on the assembled retaining wall 4, the steel pipe column 15 is provided with a tie rod 12, and the outer side of the tie rod 12 is provided with a temporary scissors brace 11, and the temporary scissors brace 11- Temporary diagonal braces 13 are arranged on the side, and anchor plates 41 are arranged at the bottom of the temporary diagonal braces 13, and fixing nails 42 are set to fix the anchor plates 41 to the original ground 39.

As shown in Figure 7, a unilateral formwork system is set in the deformation joint, and the unilateral formwork system includes a foamed plastic board 21, a single-side template 19 and a rotary brace 18, and a foamed plastic board 21 is arranged at the deformation joint, and the foamed plastic board 21 is provided with a single-side formwork 19 on the outside, a slanting backing plate 23 is set on the unilateral formwork 19, a rotary slanting brace 18 is set between the original ground 39 and the slanting backing plate 23 of the unilateral formwork 19, and a temporary fixing is set at the bottom of the unilateral formwork 19. Bolt 20.

As shown in Figure 8, the foam concrete multi-pipe synchronous pouring integral lifting mobile frame is adopted when the foam concrete is poured, and the foam concrete multi-pipe synchronous pouring integral lifting mobile frame is composed of lockable rollers 26, support rods 27, and telescopic devices. 28. Detachable ladder 29, column 30, buttress 31, construction platform 32, railing 33, openable railing 34, etc., the bottom of column 30 is equipped with lockable roller 26, the middle of column 30 is equipped with telescopic device 28, column Between the 30, the pair of braces 31 is set, the support rod 27 is set between the telescopic devices 28, the construction platform 32 is set on the top of the column 30, the fence 33 is set on the top of the construction platform 32, and the fixed fence 35 is set between the columns 30 above the construction platform 32, The opening above the construction platform 32 is provided with an openable railing 34, and the corresponding detachable ladder 29 is arranged below the openable railing 34. After the worker is in place, the ladder is detachable to facilitate the movement of the construction platform 32. The telescopic device can make the construction platform 32 up and down. Moving, the lockable roller 26 can make the construction platform 32 move left and right, and can be poured and constructed synchronously around by a plurality of workers.

Embodiment two

The present invention also provides a construction method for a lightweight foam concrete embankment at the head of a prefabricated retaining wall. The foundation of the prefabricated retaining wall adopts a prefabricated construction. After the strip foundation is pre-embedded with a sleeve, steel pipe columns are installed to form a vertical frame support system for the retaining wall. The retaining wall is quickly embedded and installed with the vertical frame system. The pre-embedded hoop steel bars and piles in the prefabricated retaining wall form a temporary hoop support system. The integral mobile frame is constructed by simultaneous pouring of pipes, and the concrete topping is constructed by rapid pouring and stereotyped molds. Specifically include the following steps:

(1) Component prefabrication: Prefabricated strip concrete foundation 3 and fabricated retaining wall 4 are accurately prefabricated according to the drawings. When the strip foundation is prefabricated, the upper part is evenly equipped with embedded sleeves 24, and embedded steel bars 36 are installed at one end of the strip foundation, and the other end is set Reserved holes 37 and grouting holes 40, on the assembled retaining wall 4 corresponding to the embedded sleeve 24, set retaining wall reserved notches 14, on the assembled retaining wall 4, reserve retaining wall pre-embedded hoops 5 according to the position of the pile type abutment column rebar.

(2) Construction of the foundation cushion: After the construction of the abutment columns is completed, construct the foundation cushion 2, and install embedded rivets 16 in the cushion according to the positions of the holes reserved for the foundation before concrete pouring.

(3) Assembled construction of the prefabricated strip concrete foundation: Assemble the prefabricated strip concrete foundation 3 according to the groove 25, the rivet hole 43 reserved for the strip foundation at the bottom of the prefabricated strip concrete foundation 3 is accurately inserted into the embedded rivet 16, and the pre-embedded rivet 16 is accurately inserted. Concrete is poured into the reserved hole, and steel pipe column 15 is installed in the embedded sleeve 24 .

(4) Construction of the vertical frame system of columns: install horizontal tie rods 12 between 15 steel pipe columns, and fix them with limit buckles 38, install temporary scissor braces 11 outside the tie rods 12, and set temporary diagonal braces 13 outside the scissor braces, temporarily The bottom of the diagonal brace 13 is fixed on the original ground 39 by fixing nails 42 .

(5) Assembling the prefabricated retaining wall: according to the position of the steel pipe column 15 and the reserved notch 14 of the retaining wall, the assembled retaining wall 4 is assembled in pieces, the steel pipe column 15 is matched with the reserved notch 14 of the retaining wall, and the installation of a prefabricated retaining wall 4 is completed The pre-embedded retaining hoop 5 reinforced on the upper part is bent around the pile-type abutment 1 to form a hoop, which is used to fix the assembled retaining wall 4 and the pile-type abutment 1 .

(6) Single-side formwork support for deformation joints: Set up a single-side formwork 19 at the position where deformation joints are required, and fix the bottom of the formwork on the original ground 39 with temporary fixing bolts 20, and arrange a layer of foam plastic board 21 along the formwork inside the formwork.

(7) Foamed concrete pouring: pouring foamed concrete through multi-pipe synchronous pouring integral lifting mobile frame, first install detachable ladder 29, unload the ladder after workers and pouring conduits are in place, move or raise construction platform 32 with pouring, Quickly finish pouring.

(8) Concrete topping construction: After the foam concrete pouring is completed, the topping construction is carried out. The inner formwork of the topping sizing mold 9 is placed on the foam concrete 6, and the outer formwork is fixed with the inner formwork by the pull bolt 10. After the installation is completed, the Brush release agent on pull bolt 10, and pour concrete to form concrete topping 7.

(9) Plastering of the reserved notch for the retaining wall: clear the loose concrete in the reserved notch 14 of the retaining wall and plaster the surface with fine stone concrete of a higher strength grade in the notch.

The retaining wall and its foundation are prefabricated in the factory, transported to the construction site for quick mosaic assembly construction, and multiple temporary supports are set up to improve construction safety; the construction section supports formwork on one side and puts foam plastic boards, and multi-pipe synchronous pouring is used when pouring foam concrete as a whole The lifting mobile frame can improve the construction efficiency of foam concrete pouring.

Claims (1)

1. A construction method of a prefabricated retaining bridge head foam concrete lightweight embankment, is characterized in that, comprises the following steps: 1) Component prefabrication: prefabricated prefabricated strip concrete foundation (3) and prefabricated retaining wall (4). When prefabricated strip concrete foundation (3) is prefabricated, pre-embedded sleeves (24) are evenly arranged on the upper part, One end of the shaped concrete foundation (3) is provided with embedded steel bars (36), the other end is provided with reserved holes (37) and grouting holes (40), and the prefabricated retaining wall (4) is provided with a retaining wall corresponding to the embedded sleeve (24) Reserving notches (14), pre-embedded hoops (5) steel bars are reserved on the fabricated retaining wall (4) according to the position of the pile-type abutment; 2) Construction of strip foundation cushion: after the pile-column abutment construction is completed, the strip foundation cushion (2) shall be constructed. Reserve the position of the rivet hole (43) to set the embedded rivet (16); 3) Assembled construction of the prefabricated strip concrete foundation: Assemble the prefabricated strip concrete foundation (3) according to the tongue and groove (25), and accurately insert the rivet holes (43) reserved for the strip foundation at the bottom of the prefabricated strip concrete foundation (3) Pre-embed rivets (16), pour concrete into the rivet holes (43) reserved in the strip base, and install steel pipe columns (15) in the pre-embedded sleeves (24); 4) Construction of the vertical frame system of columns: install horizontal tie rods (12) between the steel pipe columns (15) and fix them with limit buckles (38), install temporary scissor braces (11) on the outside of the tie rods (12), temporary scissors Temporary diagonal braces (13) are arranged on the outside of the brace (11), and the bottom of the temporary diagonal braces (13) is fixed on the original ground (39) by fixing nails (42); 5) Assembling the prefabricated retaining wall: Assembling the prefabricated retaining wall (4) in blocks according to the positions of the steel pipe column (15) and the reserved notch (14) for the retaining wall, and the steel pipe column (15) is matched with the reserved notch (14) for the retaining wall After the installation of a prefabricated retaining wall (4) is completed, the pre-embedded retaining hoop (5) on the upper part of the pre-embedded retaining wall (5) is bent around the pile-type abutment (1) to form a retaining hoop, and the assembled retaining wall (4) and Pile type abutment (1) is fixed; 6) Single-side formwork support for deformation joints: set up a single-side formwork (19) at the position where the deformation joint is required, and fix the bottom of the one-side formwork (19) to the original ground (39) with temporary fixing bolts (20), and place it on one side A layer of foam plastic board (21) is arranged along the inside of the formwork (19); 7) Foam concrete pouring: Foam concrete is poured through multi-pipe synchronous pouring of the integral lifting mobile frame. First, a detachable ladder (29) is installed. 32), complete pouring; 8) Concrete topping construction: after the foam concrete pouring is completed, the topping construction is carried out, the inner formwork of the topping finalization mold (9) is placed on the foam concrete (6), and the outer formwork is fixed to the inner formwork by the pull bolts (10). After the installation is completed, apply a release agent on the pull bolts (10), and pour concrete to form a concrete top (7); 9) Plastering of the reserved notch for the retaining wall: remove the loose concrete in the reserved notch (14) of the retaining wall and plaster the surface with fine stone concrete of a higher strength grade in the notch.

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