Sliding plate self-anchored box culvert zero-plane jacking launching device for high slope

Abstract

The invention relates to a sliding plate self-anchored box culvert zero-plane jacking launching device for a high slope. The sliding plate self-anchored box culvert zero-plane jacking launching device comprises a reinforced concrete sliding plate, a reinforced concrete rib plate, a gravel concrete cushion layer, a reinforced concrete back beam, a reinforced concrete anti-slide pile, jacking iron, a jack, a ground anchor beam, a guide pier and a self-anchored beam. The method is characterized in that a box culvert jacking sliding plate and a back beam are poured into a whole at the zero plane of the bottom of the high slope, a reinforced concrete rib plate is synchronously poured between the box culvert jacking sliding plate and the back beam, the stability of the back beam is guaranteed, and the box culvert jacking sliding plate and the back beam serve as a box culvert jacking starting base; jacking iron is arranged in front of the back beam and connected with a jack, and the other end of the jack is connected with a box culvert; longitudinal and transverse ground anchor beams are arranged below the sliding plate for fixing the sliding plate; a self-anchored beam is arranged below the sliding plate, and slide-resistant piles are arranged below the self-anchored beam and the back beam and used for balancing jacking force and preventing overall sliding and instability; and meanwhile, the depth of the slide-resistant pile is guaranteed, and the jacking device is prevented from overturning. The self-stability of the box culvert jacking device is guaranteed, the problem that the box culvert at the zero plane of the bottom of the high slope cannot be jacked is solved, and meanwhile the jacking device is simple and reliable in structure, convenient to construct, low in engineering cost, energy-saving and environment-friendly through a sliding plate self-anchoring system.

Description

Technical Field

[0001] The invention relates to a starting device for jacking a box culvert on a zero plane under the condition of jacking down through a high slope and without sky. Background Art

[0002] The box culvert jacking method is a commonly used construction method for newly built box culverts to pass under highways, railways or municipal roads. A working pit is built at the starting point of the jacking, and the working pit is below the zero plane. A slide is made in the pit, and a reinforced concrete box culvert is prefabricated on the slide. A blade foot is set at the front section of the top plate and side wall of the box culvert, and a steel blade is installed on it. A back is built after the tail of the box culvert, and then a jack is installed between the back and the bottom plate of the box culvert. At the same time, necessary reinforcement is carried out on the highway, railway or municipal road to ensure the safety of the upper route when the box culvert is jacked under. Finally, the box culvert is pushed in with the help of the jack and the back of the sky. During jacking, the blade foot at the end of the box culvert is always buried in the soil, and it is dug as it is pushed until the box culvert is fully pushed in according to the design requirements.

[0003] When the box culvert is jacked, the jack acts on the back. The conventional box culvert starting device is set in the working pit below the zero plane. The back of the box culvert is supported on the retaining structure or main structure of the working pit. The jacking force is balanced by the soil pressure outside the working pit to move the box culvert forward.

[0004] However, under high slope conditions, the box culvert is located at the zero plane, and it is impossible to set up a working pit, and the box culvert has no direct supporting structure. The existing treatment method is to artificially manufacture the back, set up a retaining structure, and backfill the back with soil or sand as the jacking back. The existing jacking device has the following problems: 1) The amount of backfilling and excavation is large and the cost is high; 2) The backfill soil is loose and difficult to compact completely, which is prone to instability; 3) It occupies a large area, and the surrounding conditions are complex and the space is small in municipal engineering, so it cannot be implemented and the scope of application is limited; 4) The environmental protection requirements in municipal engineering are high, and large-scale backfilling and excavation of earth will generate dust, pollute the environment and affect the appearance. Summary of the invention

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a sliding plate self-anchored box culvert zero-plane jacking starting device for high slopes. In view of the characteristics of the box culvert jacking under the high slope on the zero plane, a sliding plate self-anchored jacking starting device suitable for this condition is designed. The sliding plate and the back beam are cast as a whole, and the reinforced concrete ribs are used to ensure the stability of the back beam; a top iron is arranged in front of the back beam, which is connected to the jack, and the other end of the jack is connected to the box culvert; longitudinal and transverse anchor beams are arranged under the sliding plate to fix the sliding plate; a self-anchoring beam is arranged under the sliding plate, and anti-slip piles are arranged under the self-anchoring beam and the back to balance the jacking force and prevent overall sliding; at the same time, the length of the anti-slip piles should be ensured to prevent the jacking device from overturning. The present invention has the characteristics of being simple and easy to operate, and the construction quality can be controlled.

[0006] The above-mentioned slide plate and back beam are cast as a whole, and reinforced concrete ribs are used to ensure the stability of the back beam; the slide plate is arranged horizontally, the back beam is perpendicular to the slide plate, and the rib plate is a right triangle, which is perpendicular to the slide plate and the back beam.

[0007] A top iron and a jack are arranged on one side of the back beam, a reinforced concrete rib is arranged on the other side, and an anti-slip pile is arranged below, and the anti-slip pile is connected to the back beam as a whole.

[0008] Vertical and horizontal anchor beams and self-anchor beams are arranged under the above-mentioned slide plate to prevent the slide plate from sliding during the jacking process. The height of the anchor beam and the self-anchor beam is greater than the thickness of the slide plate, and the height of the self-anchor beam is greater than the height of the anchor beam.

[0009] The anti-slip piles set under the above-mentioned anchor beam and the anti-slip piles under the back beam jointly balance the jacking force of the box culvert. The number, depth and vertical angle of the anti-slip piles need to meet the anti-slip requirements of the box culvert jacking.

[0010] Guide piers are arranged on both sides of the box culvert slide plate. The guide piers are located at the ends of the transverse anchor beams, are perpendicular to the anchor beams and are cast integrally with the anchor beams.

[0011] The size of the above-mentioned slide plate should meet the assembly requirements of the jacking box culvert, back beam and rib plate. The length direction should be consistent with the jacking direction of the box culvert, and its length direction should be greater than the sum of the plane projection lengths of the rib plate, back beam, top iron and jack, and box culvert length; the width direction should be greater than the sum of the plane projection length of the box culvert width and the guide pier width.

[0012] The purpose of the present invention is to provide a starting device for jacking a box culvert on a zero plane and passing through a high slope by using a slide plate and setting a back beam to drive anti-slip piles. Compared with the prior art, the present invention mainly has the following technical advantages:

[0013] 1) It can be used for jacking on zero plane without sky and back conditions. The overall structure is safe and reliable and can be widely used;

[0014] 2) Use the slide plate, set the self-anchor beam and anti-floating pile to form a self-anchored launching device. The structure is simple, the engineering volume is small, the force is clear, the friction of the slide plate is fully utilized, and the stability is good.

[0015] 3) The skateboard and the back beam are cast as a whole, and reinforced concrete ribs are cast between the two to connect them, so the overall stability of the structure is good.

[0016] 4) Economic benefit analysis: avoid large-scale earthwork, low cost, fast construction speed and easy demolition;

[0017] 5) Social benefit analysis: It occupies a small area and has little impact on the surrounding environment. In municipal engineering projects with complex surrounding conditions and limited working space, this device can give full play to its advantages.

[0018] 6) Environmental effect analysis: The project volume is small, avoiding large-scale earthwork and dust, causing less pollution to the environment and being more environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of a conventional box culvert jacking starting device;

[0020] Figure 2 It is a schematic diagram of the longitudinal section of the structure of the conventional box culvert jacking starting device;

[0021] Figure 3 It is a structural plan diagram of a zero-plane jacking device for a self-anchored box culvert of a sliding plate;

[0022] Figure 4 It is a schematic diagram of the longitudinal section of the structure of the zero-plane jacking device of the slide plate self-anchored box culvert;

[0023] Figure 5 It is a schematic diagram of the cross-section of the structure of the slide plate self-anchored box culvert zero-plane jacking device.

[0024] Brief description: Figure 1 and Figure 2 The schematic diagram of the structure plan and longitudinal section of a conventional box culvert jacking starting device is shown in the figure. In the conventional scheme, the box culvert (11) is generally located in a foundation pit surrounded by a starting shaft retaining structure (13), below the ground level, and relies on the starting shaft retaining structure (13) and the soil behind it to provide jacking reaction force. Figure 3 , Figure 4 , Figure 5 The invention is a starting device, wherein the box culvert (11) is located above the ground plane and relies on a reinforced concrete back beam (4) and reinforced concrete anti-sliding piles (5) to provide a thrust reaction force. DETAILED DESCRIPTION

[0025] In order to make the technical solutions, implementation methods and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings. It should be understood that the technical features involved in the various implementation methods of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] Figure numbers: reinforced concrete slide plate (1), reinforced concrete rib plate (2), crushed stone concrete cushion layer (3), reinforced concrete back beam (4), reinforced concrete anti-sliding pile (5), top iron (6), jack (7), anchor beam (8), guide pier (9), self-anchor beam (10), box culvert (11), starting shaft enclosure structure to be demolished (12), starting shaft enclosure structure (13).

[0027] The patent of this invention is aimed at the shortcomings of the existing box culvert jacking device for zero plane up and down high slopes, and proposes a new type of box culvert jacking device structure using a slide plate self-aiming. The structure is simple, easy to construct, the overall structure is stable, the engineering quantity is small, the cost is low, and the environmental impact is small. It can be widely used in highways, railways, municipal roads, subways and other zero planes.

[0028] The present invention utilizes the slide plate of the box culvert jacking, sets the self-anchor beam and the anti-sliding pile to form the box culvert jacking starting device. The specific process steps are as follows:

[0029] 1) Accurately lay out and position the anti-sliding piles, drill holes for the anti-sliding piles, install steel cages, pour concrete, and after the concrete reaches the designed strength, remove the pile heads with slurry;

[0030] 2) Lay the crushed stone concrete cushion layer, wet-joint the pile head, tie the steel bars, support the formwork and cast the back beam, rib plate, self-anchor beam, ground anchor beam and slide plate. When the concrete strength reaches 75%, remove the formwork.

[0031] 3) Use M10 mortar to level the surface of the cast skateboard, and lay a lubricating layer, engine oil and talcum powder on the surface of the skateboard;

[0032] 4) Prefabricate the box culvert on the slide plate, and fix the blade angle at the front section of the box culvert;

[0033] 5) Install the jacking iron and jack between the box and the back beam, and push the box forward;

[0034] 6) During the jacking process of the box culvert, bentonite slurry is injected from the grouting holes to lubricate the surrounding soil and reduce friction resistance.

Claims

1. A sliding plate self-anchored box culvert zero plane jacking starting device for high slopes, comprising a reinforced concrete sliding plate (1), a reinforced concrete rib plate (2), a crushed stone concrete cushion layer (3), a reinforced concrete back beam (4), a reinforced concrete anti-sliding pile (5), a top iron (6), a jack (7), an anchor beam (8), a guide pier (9), a self-anchored beam (10), and a box culvert (11). It is characterized in that The slide plate (1) and the back beam (4) are cast as a whole on the zero plane, and the reinforced concrete rib plate (2) is used to ensure the stability of the back beam, which serves as the starting base for the box culvert jacking; a top iron (6) is arranged in front of the back beam and connected to a jack (7), and the other end of the jack (7) is connected to the box culvert (11); longitudinal and transverse anchor beams (8) are arranged below the slide plate (1) to fix the slide plate (1); a self-anchor beam (10) is arranged below the slide plate (1), and anti-slip piles (5) are arranged below the self-anchor beam (10) and the back beam to balance the jacking force and prevent the whole from sliding; at the same time, the length of the anti-slip pile (5) should be ensured to prevent the jacking device from overturning. The construction process of the jacking device is as follows: drilling and constructing anti-slip piles (5), applying a cushion layer (3), tying steel bars, supporting formwork and casting the slide plate (1), back beam (4), anchor beam (8), self-anchor beam (10), and rib plate (2), wet joint treatment of the junction of the anti-slip pile (5) and the back beam (4) and self-anchor beam (10), so that they are cast as a whole to form a self-anchored box culvert jacking device. A lubricating layer, engine oil, and talcum powder are laid on the slide plate (1), and the jacking iron (6) and jack (7) are installed, and the box culvert (11) is constructed by jacking.

2. The zero-plane jacking starting device for the self-anchored box culvert with a slide plate for high slopes as claimed in claim 1, characterized in that: The slide plate (1), the back beam (4) and the rib plate (2) are cast as a whole to ensure the stability of the entire device. The rib plate (2) is used to ensure the stability of the back beam during the jacking process.

3. The sliding plate self-anchored box culvert zero-plane jacking starting device for high slopes as claimed in claim 1, characterized in that: Longitudinal and transverse ground anchor beams (8) and self-anchor beams (10) are arranged below the slide plate (1) to prevent the slide plate from sliding during the jacking process.

4. The sliding plate self-anchored box culvert zero-plane jacking starting device for high slopes as claimed in claim 1, characterized in that: A row of anti-sliding piles is arranged below the back beam (4), and a row of anti-sliding piles is arranged below the self-anchor beam (10). The number, depth and vertical angle of the anti-sliding piles can be adjusted according to the size of the jacking force.

5. The sliding plate self-anchored box culvert zero-plane jacking starting device for high slopes as claimed in claim 1, characterized in that: The number, depth and vertical angle of the anti-sliding piles (5) below the back beam (4) and the self-anchoring beam (10) need to meet the anti-sliding requirements of the box culvert jacking. Specifically, when the box culvert is jacked, the horizontal resistance of the anti-sliding piles (5) is balanced with the passive earth pressure and the friction force of the slide plate (1).

6. The sliding plate self-anchored box culvert zero-plane jacking starting device for high slopes as claimed in claim 1, characterized in that: Guide piers (9) are arranged on both sides of the box body, and the guide piers and the slide plate (1) are cast as a whole.

7. The sliding plate self-anchored box culvert zero-plane jacking starting device for high slopes as claimed in claim 1, characterized in that: The dimensions of the slide plate (1) shown should meet the assembly requirements of the jacking box culvert (11), the back beam (4), and the rib plate (2), wherein the length direction is consistent with the jacking direction of the box culvert (11), and the length direction should be greater than the sum of the plane projection lengths of the rib plate (2), the back beam (4), the top iron (6) and the jack (7), and the box culvert (11); wherein the width direction should be greater than the sum of the plane projection length of the box culvert (11) and the width of the guide pier (9).

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