CN102535302B - Temporary pavement blanket structure for super-shallow buried subsurface-excavated underground engineering, and construction method thereof - Google Patents

Abstract

The invention relates to a temporary pavement pavement structure and a construction method for ultra-shallow underground excavation, including a main pavement structure, a rubber pad, a ramp road pavement structure, a counter-pressure steel plate pavement structure and spikes; the main pavement structure consists of several The main bedding structure standard kit is welded. The main bedding structure standard kit is composed of several bottom strips, some middle I-beams and a top printed steel plate. The ramp bedding structure is composed of several ramp bedding structure standard kits. The ramp The standard set of pavement structure is composed of slatted boards at the bottom, I-beams with variable height in the middle and printed steel plates at the top; rubber pads are fully paved under the pavement pavement structure, and rubber pads are installed at the intersection of the bedding structure of the ramp and the road surfaces on both sides. Counter pressure steel plate pavement structure. During construction, the method of downside construction. The structure and construction method of the present invention are simple in structure, convenient and fast in construction, have little influence on ground traffic, and have remarkable effect on load reduction of underground engineering.

Description

Temporary pavement covering structure and construction method for ultra-shallow underground excavation

technical field

The invention relates to a temporary pavement pavement structure laid on urban roads, in particular to a temporary pavement pavement structure and a construction method for ultra-shallow buried excavation underground projects.

Background technique

In the construction of underground roads under shallow buried underground excavation, the method of advanced support and initial support is often used to reinforce the surrounding rock of the underground project, especially the top surrounding rock, to keep it stable without excessive deformation, which can Bear the weight of the soil above and the load of the road vehicle. However, due to the adverse effects of factors such as poor rock and soil conditions, thin covering soil, and many underground pipelines, advance support and initial support cannot be effectively implemented, or the bearing capacity of the reinforced strata is still not enough to resist the upper stratum and the load. Cause road subsidence, endanger driving safety, and even bring loss of life and property. At present, for shallow buried underground projects, 10-20mm thick steel plates are often laid on the ground as an auxiliary measure. However, due to the limited thickness and low bending stiffness, the role of diffusion to reduce the load is limited. According to the analysis of the principles of material mechanics, simply increasing the thickness of the steel plate has little effect. In addition, under the action of the vehicle load, the steel plate vibrates vertically, which will instead increase the vertical dynamic load; the steel plate is subjected to repeated horizontal forces during the driving or braking process of the vehicle, resulting in longitudinal movement.

Contents of the invention

The purpose of the present invention is to provide a temporary pavement structure and construction method for ultra-shallow buried excavation underground engineering with simple structure, convenient and fast construction, little impact on ground traffic, and good effect on underground engineering load reduction. By adopting temporary pavement pavement structure and steel composite structure, the bending rigidity of the pavement structure is greatly increased. At the same time, ramps are set on both sides of the pavement structure to ensure that road vehicles can run safely at a certain speed limit, reducing vehicle loads directly to the underground works. The role of the top surrounding rock.

The technical scheme that the present invention adopts is as follows:

A temporary pavement pavement structure for ultra-shallow buried excavation underground engineering, characterized in that: a temporary pavement pavement structure is arranged on the pavement above the shallow buried underground excavation project, and the paving range is along the longitudinal length of the road to cover the construction of the underground structure The range that may be affected is suitable, and the horizontal direction can cover all motor vehicle lanes. Temporary pavement pavement structure includes main bedding structure, rubber pad, ramp bedding structure, counter pressure steel plate pavement structure and spikes; said main bedding structure is composed of several standard sets of main bedding structures welded, and said main bedding structure standard set consists of Several bottom slats, several middle I-beams and a top printed steel plate are welded. The top printed steel plate, the bottom slats and the middle I-steel are directly welded. The distance between each two bottom slats is 0.5m~1.0m. This enables workers to weld the top steel plate to the middle I-beam at this distance. The main bedding structure standard kits arranged side by side along the bridge direction are welded with longitudinal long steel bars to form the main bedding structure; the two ends of the main bedding structure are provided with ramp bedding structures, and the transverse bridge direction between the main bedding structure and the ramp bedding structure It is welded with horizontal full-length steel bars, and the diameter of vertical and horizontal full-length steel bars is selected according to the thickness of the top steel plate to ensure that the pavement is smooth; the ramp bedding structure is composed of several standard sets of ramp bedding structures welded. The standard set of bedding structure is composed of bottom slatted plate, middle oblique variable-height I-beam and top printed steel plate welded. The welding method of the suite is the same. The oblique variable-height I-beam in the middle is cut obliquely from the complete I-beam. The ramp bedding structure standard sets arranged side by side along the bridge direction are welded with longitudinal long steel bars to form the ramp. Pavement structure; 10-15mm thick rubber pads are fully paved under the main bedding structure and the ramp bedding structures on both sides, as a continuous elastic foundation for the construction temporary road bedding structure; Pressure steel plate pavement structure, one end of the reverse pressure steel plate in the reverse pressure steel plate pavement structure is welded to the ramp pavement structure through a horizontal long steel bar, and the other end is connected to the road surface through spikes, which are implanted and anchored after drilling holes on the road surface Way to fix the anti-pressure steel plate on the road.

The main bedding structure is prefabricated in blocks according to the width of the lane. The number of blocks, that is, the number of standard sets of the main bedding structure is equal to the total number of up and down motor vehicle lanes, and the length of the blocks is greater than or equal to the span of the underground project. Among them, the standard set of the main bedding structure The width is determined according to the standard width of the specific lane, which is divided into 4 types: 3.0m, 3.5m, 3.75m, and 4.0m. The length of the main bedding structure standard kit is determined according to the span of the underground structure, and is greater than or equal to the span of the underground structure; The ramp bedding structure is also divided into blocks according to the number of motor vehicle lanes. The number of blocks is equal to the total number of up and down motor vehicle lanes. The traffic is smoother, and the width of the ramp pavement standard kit is the same as that of the main pavement standard kit. The total length of the pavement pavement structure (the length of the main pavement structure standard kit plus the length of the two ramp pavement standard kits), according to the formula Calculation, where b is the width of the underground engineering structure, H is the depth from the bottom surface of the lower edge of the underground engineering structure to the road surface, and φ is the weighted average value of the internal friction angle of each soil layer within the depth range of H.

The above-mentioned temporary pavement pavement structure for shallow buried underground engineering construction is composed of a main pavement structure, a ramp pavement structure, a counter-pressure steel plate pavement, and a densely paved rubber pad at the bottom. The main bedding structure is composed of printed steel plates at the top, I-beams in the middle and decorative plates at the bottom, which are prefabricated according to the standard lane width and hoisted and laid on site as a whole; the bedding structure of the ramp is composed of printed steel plates at the top, I-beams cut obliquely in the middle and decorative plates at the bottom The composition is also prefabricated according to the standard lane width, hoisted and laid as a whole on site; the anti-pressure steel plate pavement is designed according to a single road width in the transverse direction of the road, and the width design in the longitudinal direction of the road is preferably 4-6m. The top steel plates between the standard kits are connected by laying and filling steel bars and welded, and the counter-pressure steel plates are fixed on the road surface through spikes anchored in the road surface.

The construction method of above-mentioned temporary construction pavement covering structure that is used for shallow buried underground excavation engineering is:

When laying the pavement pavement structure of temporary construction, the method of pouring side construction is adopted, that is, half of the road on one side is closed first to lay the temporary pavement pavement structure, and after the laying is completed, the operation of the temporary pavement pavement structure of the road on one side is opened; then, the other side is closed The pavement pavement structure of the other half of the road will be paved temporarily. After the paving is completed, the middle fence and guardrails on both sides will be set up; finally, the pavement pavement structure of the temporary construction will be opened in both directions. The specific construction steps are as follows:

The first step: measure and set out the line, and determine the position of the construction pavement pavement structure;

The second step: first close the half-width road on one side to lay the pavement pavement structure, and first lay the rubber pad as the continuous elastic foundation of the pavement pavement structure;

The third step is to lay a number of standard sets of main bedding structure on the rubber mat. The standard sets of main bedding structure are welded into a whole in the factory, and the whole set is hoisted and installed after being transported to the site;

The fourth step is to lay the standard set of bedding structure of the ramp. The standard set of bedding structure of the ramp is welded into a whole in the factory, and it is hoisted and installed as a whole after being transported to the site;

In the fifth step, several standard sets of main bedding structures arranged side by side along the bridge direction are welded and connected by longitudinal long steel bars to form the main bedding structure; The long steel bar is welded to form the bedding structure of the ramp; the cross-bridge direction between the two ends of the main bedding structure and the bedding structure of the ramp is welded with transverse long steel bars;

The sixth step is to repeat the second step to the fifth step, to close the road on the other side and carry out the laying of the pavement pavement structure for the temporary construction of the other half of the road;

The sixth step is to lay the counter-pressure steel plate on the bedding structure of the ramp. One end of the upper part of the counter-pressure steel plate is welded to the middle of the bedding structure of the ramp through a horizontal full-length steel bar, and the other end of the lower part is connected to the road surface through spikes;

The seventh step is to set up the middle isolation fence and the protective fences on both sides to resume two-way traffic.

During the opening process, a full-time safety officer is on duty 24 hours a day, and when some parts are found to be falling off or not smooth, remedial measures or protective measures are taken in time to ensure driving safety.

Beneficial effect

The temporary construction pavement pavement structure and its construction method for shallow buried underground engineering of the present invention are simple in structure, convenient and fast in construction, have little impact on ground traffic, and have good load reduction effect on underground engineering. The construction pavement pavement, the bending rigidity is greatly increased, and the load is divided by the construction pavement pavement structure when the vehicle passes, which reduces the effect of the road vehicle load on the top surrounding rock of the underground project. Lay a layer of 10-15mm thick rubber cushion between the pavement structure and the road surface to increase the friction between the pavement structure and the road surface, reduce vertical and longitudinal vibration, reduce the effect of vehicle dynamic load, and also play a certain role on the road surface Protection against damage to the road surface. At the place where the ramp is in contact with the ground, there is a counter-pressure steel plate to prevent the end of the ramp from lifting and endangering the driving safety. The pavement structure is fixed on the road surface by anchor spikes, and there will be no longitudinal movement. Therefore, this structure has a good application prospect.

Description of drawings

Fig. 1 is a schematic plan view of the structure of the present invention;

Fig. 2 is the schematic diagram of the longitudinal section of the construction pavement pavement structure of Fig. 1 of the present invention;

Fig. 3 is the schematic cross-sectional view of the construction pavement pavement structure of Fig. 1 of the present invention

Fig. 4 is the main bedding structure standard suite plan schematic diagram of Fig. 2 of the present invention;

Fig. 5 is the schematic diagram of the longitudinal section of the main bedding structure standard suite of Fig. 2 of the present invention;

Fig. 6 is the main bedding structure standard suite cross-sectional schematic diagram of Fig. 2 of the present invention;

Fig. 7 is a detailed view of the main bedding structure standard kit panel structure of Fig. 2 of the present invention;

Fig. 8 is a schematic plan view of the standard kit of the slope slab bedding structure of Fig. 2 of the present invention;

Fig. 9 is a schematic diagram of the longitudinal section of the standard suite of the slope slab bedding structure of Fig. 2 of the present invention;

Fig. 10 is a schematic cross-sectional view of the standard suite of the slope slab bedding structure of Fig. 2 of the present invention;

In the picture:

1-Standard set of main bedding structure; 2-Standard set of slope slab bedding structure; 3-Reverse pressure steel plate pavement structure; 4-Pavement; 5-Rubber pad; Printed steel plate at the top; 9- long steel bar; 10- oblique variable height I-beam in the middle; 11- spike; 12- counter pressure steel plate; 13- underground engineering; 14- potential rupture surface; -Middle divider.

Detailed ways

The entrance and exit of a certain subway is excavated in advance to pass through a busy street. The length of the channel is 49.99m, and the thickness of the top covering soil of the structure is 1.79-2.94m. m, 9.50m×6.35m (civilian air defense section), 7.80m×4.95m 3 kinds of sections.

As shown in Fig. 1-10, a kind of temporary pavement pavement structure that is used for ultra-shallow underground excavation underground engineering of the present invention, the pavement 4 above shallow buried underground excavation engineering 13 is provided with temporary pavement pavement structure, temporary construction pavement pavement The structure includes the main bedding structure, rubber pad, ramp bedding structure, counter-pressure steel plate pavement structure and spikes; the main bedding structure is composed of several main bedding structure standard kits 1 welded, and the main bedding structure standard kit 1 is composed of several bottom strips6 , a number of middle I-beams 7 and a top printed steel plate 8 are welded, and every two bottom strips 6 are separated by 0.5m to 1.0m. The steel bar 9 is welded to form the main bedding structure; the two ends of the main bedding structure are provided with ramp bedding structures, and the transverse bridge direction between the main bedding structure and the ramp bedding structure is welded with horizontal long steel bars 9; the ramp bedding structure is composed of several ramp bedding structures. The bedding structure standard kit 2 is welded. The ramp bedding structure standard kit 2 is composed of the bottom strip plate 6, the oblique variable height I-beam 10 in the middle and the top printed steel plate 8. The standard bedding structure of the ramp is arranged side by side along the bridge direction. The longitudinal full-length steel bars 9 are welded between the sets 2 to form the bedding structure of the ramp; the standard set 1 of the main bedding structure and the standard set 2 of the bedding structure of the ramp are welded and assembled in the metal processing yard, and transported to the construction site as a whole, using 100t vehicles Hoist the overall hoisting and laying in place. A 10-15 mm thick rubber pad 5 is fully paved under the main bedding structure and the ramp bedding structures on both sides; a counter-pressure steel plate pavement structure 3 is provided at the intersection of the ramp bedding structure and the road surface 4 on both sides, and the counter-pressure steel plate pavement structure One end of the counter-pressure steel plate 12 in 3 is welded on the bedding structure of the ramp through the horizontal long steel bar 9, and the other end is connected and fixed with the road surface 4 through the spike 11.

计算，其中，b为地下工程13的宽度，H为地下工程下边缘底面到路面4的深度，φ为H深度范围内各土层的内摩擦角加权平均值。Among them, the main bedding structure is prefabricated in blocks according to the width of the driveway. The number of blocks is equal to the total number of up and down motor vehicle lanes, and the length of the block is greater than or equal to the span of the underground project 13. The width of standard kit 1 is determined according to the standard width of the specific lane, which is divided into 4 types: 3.0m, 3.5m, 3.75m, and 4.0m. The length of standard kit 1 for the main bedding structure is determined according to the span of the underground project, and is greater than or equal to the underground project The span of 13; the ramp bedding structure is also divided into blocks according to the number of motor vehicle lanes, the number of blocks is equal to the total number of up and down motor vehicle lanes, and the length of the ramp bedding structure standard suite 2 is 3.5% The slope of the slope is determined, and the width of the ramp pavement structure standard kit 2 is the same as that of the main pavement structure standard kit 1; the total length L of the pavement pavement structure is according to the formula

Calculation, wherein, b is the width of the underground project 13, H is the depth from the bottom surface of the lower edge of the underground project to the road surface 4, and φ is the weighted average value of the internal friction angle of each soil layer in the depth range of H.

The above-mentioned construction method for the temporary pavement covering structure of the ultra-shallow underground excavation project is characterized in that:

When laying the pavement pavement structure of temporary construction, the method of pouring side construction is adopted, that is, half of the road on one side is closed first to lay the temporary pavement pavement structure, and after the laying is completed, the operation of the temporary pavement pavement structure of the road on one side is opened; then, the other side is closed The other half of the road is paved with a pavement pavement structure for temporary construction. After the pavement is completed, the middle fence 16 and guardrails on both sides are set up; finally, the temporary construction pavement pavement structure is opened for operation in both directions. The specific construction steps are:

The first step: measure and set out the line, and determine the position of the construction pavement pavement structure;

The second step: first close the half-width road on one side to lay the pavement pavement structure, and first lay the rubber pad as the continuous elastic foundation of the pavement pavement structure;

In the third step, several main bedding structure standard kits 1 are laid on the rubber pad 5, and the main bedding structure standard kits 1 are welded into a whole in the factory, and are hoisted and installed as a whole after being transported to the site;

The fourth step is to lay the ramp bedding structure standard kit 2. The ramp bedding structure standard kit 2 is welded into a whole in the factory, and it is hoisted and installed as a whole after being transported to the site;

In the fifth step, several main bedding structure standard sets 1 arranged side by side along the bridge direction are welded and connected through longitudinal long steel bars 9 to form the main bedding structure; Longitudinal full-length steel bars 9 are welded to form the bedding structure of the ramp; the cross-bridge direction between the two ends of the main bedding structure and the bedding structure of the ramp is welded by horizontal full-length steel bars 9;

The sixth step is to repeat the second step to the fifth step, to close the road on the other side and carry out the laying of the pavement pavement structure for the temporary construction of the other half of the road;

The sixth step is to lay the counter-pressure steel plate 12 on the bedding structure of the ramp. One end of the upper part of the counter-pressure steel plate 12 is welded to the middle of the bedding structure of the ramp through the transverse full-length steel bar 9, and the other end of the lower part is connected and fixed to the road surface 4 through the spike 11;

The seventh step is to set up the middle isolation fence 16 and the protective fences on both sides to resume two-way traffic.

During the opening process, a full-time safety officer is on duty 24 hours a day, and when some parts are found to be falling off or not smooth, remedial measures or protective measures are taken in time to ensure driving safety.

The above is a typical embodiment of the present invention, and the practice of the present invention is not limited thereto.

Claims (6)

1. A temporary road pavement structure for ultra-shallow buried excavation underground engineering, characterized in that: a temporary pavement pavement structure is arranged on the road surface (4) above the shallow buried underground excavation project (13), and the temporary construction pavement pavement structure Including the main bedding structure, rubber mat, ramp bedding structure, counter pressure steel plate pavement structure and spikes; the main bedding structure is composed of several main bedding structure standard kits (1) welded, the main bedding structure standard kit (1) It is composed of several bottom slats (6), several middle I-beams (7) and a top stamped steel plate (8) welded together. The main bedding structure standard suite (1) arranged side by side along the bridge direction adopts longitudinal full-length steel bars (9) The main bedding structure is formed by welding; ramp bedding structures are arranged at both ends of the main bedding structure, and the transverse bridge direction between the main bedding structure and the bedding structure of the ramp is welded with horizontal long steel bars (9); the bedding of the ramp The structure is composed of several standard sets of ramp bedding structures (2) welded, and the standard set of ramp bedding structures (2) consists of bottom embellishment strips (6), middle oblique variable-height I-beams (10) and top stamped steel plates (8) Welding structure, the standard sets of ramp bedding structures arranged side by side along the bridge direction (2) are welded with longitudinal long steel bars (9) to form the ramp bedding structure; under the main bedding structure and the ramp bedding structures on both sides Rubber pads (5) are fully paved; a counter-pressure steel plate pavement structure (3) is provided at the intersection of the bedding structure of the ramp and the road surfaces (4) on both sides, and the counter-pressure steel plate (12) in the counter-pressure steel plate pavement structure (3) ) one end is welded to the bedding structure of the ramp through a horizontal full-length steel bar (9), and the other end is connected and fixed to the road surface (4) through spikes (11). 2. A temporary pavement pavement structure for ultra-shallow buried underground excavation according to claim 1, characterized in that: the top and both sides of the temporary pavement pavement structure are respectively provided with intermediate barriers (16) and side rails. 3. A temporary pavement pavement structure for ultra-shallow underground excavation according to claim 1, characterized in that: every two bottom strips (6 ) at a distance of 0.5m to 1.0m. 4. A temporary pavement pavement structure for ultra-shallow underground excavation according to claim 1, characterized in that: the thickness of the rubber pad (5) is 10-15 mm. 5. A temporary pavement pavement structure for ultra-shallow underground excavation according to claim 1, characterized in that: the main pavement structure is prefabricated in blocks according to the width of the lane, and the number of blocks is the standard of the main pavement structure The number of kits (1) is equal to the total number of up and down motor vehicle lanes, and the length of the block is greater than or equal to the span of the underground project (13), wherein the width of the main bedding structure standard kit (1) is determined according to the standard width of the specific lane, Divided into 4 types of 3.0m, 3.5m, 3.75m and 4.0m, the length of the main bedding structure standard kit (1) is determined according to the span of the underground project, and is greater than or equal to the span of the underground project (13); The number of lanes is divided into blocks. The number of blocks is equal to the total number of up and down motor vehicle lanes. The length of the standard set of ramp bedding structures (2) is determined according to the slope of 3.5%. The width of the structure standard kit (2) is the same as that of the main pavement structure standard kit (1); the total length L of the pavement pavement structure is

Calculation, where b is the width of the underground project (13), H is the depth from the bottom edge of the underground project to the road surface (4), and φ is the weighted average value of the internal friction angle of each soil layer within the depth range of H. 6. A construction method for a temporary pavement covering structure for ultra-shallow buried underground excavation according to any one of claims 1-5, characterized in that: When laying the pavement pavement structure of temporary construction, the method of pouring side construction is adopted, that is, half of the road on one side is closed first to lay the temporary pavement pavement structure, and after the laying is completed, the operation of the temporary pavement pavement structure of the road on one side is opened; then, the other side is closed The pavement pavement structure of the other half of the road is paved temporarily. After the pavement is completed, the middle isolation fence (16) and guardrails on both sides are set up; finally, the pavement pavement structure of the temporary construction is opened in both directions. The specific construction steps are as follows: The first step: measure and set out the line, and determine the position of the construction pavement pavement structure; The second step: first close the half-width road on one side to lay the pavement pavement structure, and first lay the rubber pad as the continuous elastic foundation of the pavement pavement structure; The third step is to lay a number of main bedding structure standard kits (1) on the rubber pad (5). The main bedding structure standard kits (1) are welded into a whole in the factory, and are hoisted and installed as a whole after being transported to the site; The fourth step is to lay the standard set of bedding structure of the ramp (2). The standard set of bedding structure of the ramp (2) is welded into a whole in the factory, and it is hoisted and installed as a whole after being transported to the site; In the fifth step, several standard sets of main bedding structures (1) arranged side by side along the bridge direction are welded and connected by longitudinal steel bars (9) to form the main bedding structure; several standard sets of ramp bedding structures arranged side by side along the bridge direction (2) Longitudinal full-length steel bars (9) are also welded between them to form the bedding structure of the ramp; the transverse bridge direction between the two ends of the main bedding structure and the bedding structure of the ramp is welded by horizontal full-length steel bars (9); The sixth step is to repeat the second step to the fifth step, to close the road on the other side and carry out the laying of the pavement pavement structure for the temporary construction of the other half of the road; The sixth step is to lay the counter-pressure steel plate (12) on the bedding structure of the ramp. One end of the upper part of the counter-pressure steel plate (12) is welded to the middle of the bedding structure of the ramp through the horizontal full-length steel bar (9), and the other end of the lower part is passed through the spike ( 11) Connect and fix with the road surface (4); The seventh step is to set up the middle isolation fence (16) and the protective fences on both sides to resume two-way traffic.

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